Table of Content

15 October 2017, Volume 46 Issue 10

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Preparation and Properties of AgNWs/Yb0.3 Co4Sb12 Thermoelectric Nanocomposite

ZHOU Zhen-xing;LU Xiao-fang;CHEN Peng;GU Shi-jia;WANG Ling-jun

2017, 46(10):  1879-1884. 

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AgNWs and Yb filled skutterudites Yb 0.3 Co4 Sb12 were prepared by polyol reduction of silver nitrate and melting quenching annealing method .The nanocomposite AgNWs/Yb0.3 Co4 Sb12 were obtained by combining ultrasound technology and spark plasma sintering with different AgNWs weight ratio .The microstructure of the samples were studied by XRD and FE-SEM images confirmed that AgNWs were well dispersed in Yb0.3 Co4 Sb12 matrix.The thermoelectric properties of the samples with different AgNWs contents were investigated in detail .The results show that well-dispersed AgNWs in the bulk Yb 0.3 Co4 Sb12 can give rise to a much higher electrical conductivity and thermal conductivity without a noticeable decrease in Seebeck coefficient , which suggests the improvement of composites with AgNWs thermoelectrical was limited.The maximum ZT about 1.02 is observed with AgNWs contents of 0.5wt;.

Preparation of SnO2 Electron Transport Layer Using SnCl4 Alcohol Aqueous Solution and Its Application in Perovskite Solar Cells

ZHU Shi-jie;DING Yi;ZHENG Cui-cui;HOU Fu-hua;YAO Xin;ZHANG De-kun;WEI Chang-chun;WANG Guang-cai;ZHAO Ying;ZHANG Xiao-dan

2017, 46(10):  1885-1890. 

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Because of the high rate of transmittance and electron mobility , SnO2 was widely used as the electron transport layer in perovskite solar cells .This artical explored a method of preparing SnO 2 electron transport layer through SnCl 4 hydrolysis process , which utilizes anhydrous SnCl 4 as tin precursor , ethanol as solvent and water as oxidant .It is found that the morphology and photoelectric properties of SnO 2 film can be modulated by adjusting the ratio of water to the solution .Through the optimization of production process, efficiency of planar perovskite solar cell improves up to 17.38;.

Preparation of Long-afterglow Nano-Zn3Ga2Ge2O10:Cr3 +0.01 , Pr3+0.03 , Yb3+0.3 by Sol-gel Method and Its Surface Modification

ZHOU Xue-song;FAN Jing;CHANG Shi-yan;CAI Yong-feng;SHEN Yi

2017, 46(10):  1891-1896. 

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Cr3+, Pr3+, Yb3+co-doped Zn3 Ga2 Ge2 O10 long afterglow nanophase powders were synthesized by sol-gel method from Ga(NO3)3· 8H2O, Zn(NO3)2· 6H2O, GeO2, Pr(NO3)2· 6H2O, Cr(NO3)2 · 9H2O, Yb(NO3)3· 5H2O and C3H8O7· H2O.Through XRD, SEM, excitation and emission decay curve, Zn3 Ga2 Ge2 O10 was formed after sintering at 1000 ℃ for 3 h.Samples have the best luminescent properties when the doping amount of Yb 3+is 0.3.Zn3Ga2Ge2O10:Cr3+0.01,Pr3 +0.03,Yb3+0.3 can emit deep cherry red light of 745 nm in the motivation of 267 nm UV excitation and the grain size is about 150 nm. With the increase of Yb3+ content, the grain size gradually becomes smaller .Through FT-IR, Zate potential , particle size TEM and suspension experiments , it is indicated that there is obvious core-shell structure after PEG modified PLNPs .Hydrated particle size of PEG-PLNPs is about 155 nm and the water solubility increases greatly which can suspense more than 48 h at the concentration of 0.3 mg/mL.The above shows that the PEG package PLNPs successfully .

Progress of High Quality Diamond Single Crystal Prepared by CVD Method

LIU Xiao-chen;GUO Hui;AN Xiao-ming;LI Yi-feng;JIANG Long

2017, 46(10):  1897-1901. 

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Main method of preparation of single crystal diamond and carries on their comparison was introduced , the research progress of the preparation of diamond single crystal by microwave plasma chemical vapor deposition were reviewed from the choice of seed crystal , pretreatment and synthetic technology , and introduces the progress in preparation of single crystal diamond at home and abroad , the last application of CVD single crystal diamond in the electronic field was prospected .

Preparation and Luminescence Property of Ho3+/Yb3 +:8YSZ Nanopowders

LUO Jun-ming;CAO Zhi-chao;DENG Li-ping;XU Ji-lin

2017, 46(10):  1902-1906. 

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Ho3 +/Yb3 + co-doped yttria-stabilized zirconia ( 8YSZ ) nano powders were prepared by chemical coprecipitation .The effect of calcination temperatures on the fluorescence spectra and up-conversion luminescence properties of the Ho 3+/Yb3+co-doped nano 8YSZ was investigated .The results show that the Ho 3+/Yb3 +co-doped 8YSZ nano powders have a green emission peak at 549 nm under excitation of the 448 nm wavelength excitation light .The luorescence intensity of the Ho 3+/Yb3+ co-doped 8 YSZ nanopowders increases first , and then decreases with increasing the calcination temperatures.Under excitation of the 980 nm wavelength laser , the Ho3+/Yb3+ co-doped 8YSZ nanopowders have a green emission peak at a central wavelength of 539 nm and a red emission peak at a central wavelength of 650 nm in the range of 450-750 nm.With increasing the calcination temperatures , the particle sizes of the nano powders increase and the upper conversion luminescence intensity also gradually increases .

Characterization of CuInSe2 Nanocrystals Prepared by Hot-injection Method

XIA Dong-lin;GAO Hao-ran;LI Yun-feng;QIN Ke

2017, 46(10):  1907-1912. 

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CuInSe2 nanocrystals ( NCs) were synthesized by hot injection method using cuprous chloride (CuCl), indium chloride(InCl3· 4H2O), and selenium powder (Se) dissolving in a trioctylphosphine ( TOP) solution as raw materials and Oleylamine ( OLA ) and octadecylene ( ODE ) as ligand and solvent .Crystal structure , component and optical properties of as-synthesized CuInSe 2 NCs samples were characterized by X-ray diffractometer ( XRD ) , transmission electron microscopy ( TEM ) , energy dispersive spectroscopy ( EDS ) , Ultraviolet-visible spectrophotometer ( UV-vis ) . The influence of different reaction temperatures on the crystal structure , morphology , chemical composition and optical properties of CuInSe 2 was investigated . The results show that the CuInSe 2 NCs possess different morphology with chalcopyrite structure , the morphology of NCs evolve from triangle or quadrangle to sphere.The average grain size is in the range of 3.71-13.65 nm.The band gap of the NCs prepared at different reaction temperatures vary between 1.75 eV and 1.50 eV.Stable"ink"can be formed when the CuInSe 2 nanocrystals are dispersed in the organic solvent such as toluene , and such "ink"might have a practical application in CuInSe 2-based solar cells .

Influence of MgO Activity on Crystal Structure and Properties of Synthesized Magnesium Aluminate Spinel

PENG Qiang;GUO Yu-xiang;QU Dian-li;YAO Zhuo;WANG Chun-xin;YANG Yu-jing

2017, 46(10):  1913-1917. 

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The magnesium aluminum spinel was synthesized by light calcined magnesia with different activity and α-Al2 O3 by solid-phase sintering process .The effects of MgO activity on phases composition , cell parameters , microscopic structure and sintering properties to magnesium aluminum spinel were researched .And the mechanism was also discussed .The phases composition and cell parameters of synthetic sample were analysed by XRD and HighScore Plus software .The microscopic structure of synthetic sample was characterized by SEM .The results show that the high activity light calcined magnesia has higher defect energy , which can accelerate the sintering reaction and reduce the synthesis temperature of MgAl2O4.The crystals growth of MgAl2O4 was promoted by high activity light calcined magnesia .The cell parameters and the unit cell volume of the MgAl 2 O4 increase with rising MgO activity . And the grain growth is more complete .

Effect of Mechanical Activation Calcium Sulfate Whiskers Prepared by FGD Gypsum

LI Qiang;SHI Chang-wei;SHANG Chao;LIU Fu-li;GUAN Zhi-hao

2017, 46(10):  1918-1922. 

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Preparation of calcium sulfate whisker used the raw material of FGD gypsum , which was on mechanical activation , through cooling recrystallization was studied .The effect of mechanical activation on the nucleation and growth of whiskers was discussed , which depended on SEM , image granularity analysis method and related software .The results shows that calcium sulfate whiskers with larger aspect ratio could be prepared by mechanical activation of FGD gypsum .The reaction temperature is 75 ℃, sulfuric acid concentration is 2.5 mol/L, mechanical activation time is 3.5 h.Moreover, in the condition of the slurry concentration of 2;, the average aspect ratio of the prepared calcium sulfate whisker is 150 and the average diameter is 2.1 μm.

Synthesis and Electrochemical Properties of Ag/MoO2 Anchored on Ni Foam as Binder-Free Anode for Lithium Ion Batteries

QI Yan-yuan;ZHENG Shen-bo;YANG Xue;ZHOU Bo;ZHOU Yang;ZHOU Jing

2017, 46(10):  1923-1929. 

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Ag/MoO2 nanocomposites with different Ag contents were synthesized by hydrothermal method , which were anchored on the porous Ni foam to prepare Ag/MoO2/NF as binder-free electrode via the dip-coating method .It was found that Ag/MoO2 nanocomposites consisted of many -10 nm nanocrystals were uniformly loaded on Ni foam with 3D network structure.When the Ag content is 5;, Ag0.05/MoO2/NF electrode has the optimal electrochemical properties .The initial discharge capacity is 1180 mAh/g at a current density of 0.1 C.It was worth noting that the discharge capacity still retains 805 mAh/g after 100 cycles.when the current density return to 0.1 C from 2 C (468 mAh/g), Ag0.05/MoO2/NF electrode delivers a high capacity of 820 mAh/g, indicating excellent lithium storage performance .

High Haze Textured ZnO:Al with Surface Compensation and Its Applications in Silicon Thin Film Solar Cell

PENG Wen-bo;LIU Da-wei;GAO Hu;HUANG Yan-hong;YANG Yan-bin;YU Wei

2017, 46(10):  1930-1935. 

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As-deposited AZO thin films prepared by magnetron-sputtering were wet etched in diluted HCl to produce textured surface , and the effects of hydrochloric acid concentration and etching time on surface morphology , optical and electrical properties were investigated .The results indicate that the wet etched AZO film shows a large size crater morphology , a high transmittance of 70;-75;at the long wavelength after 500 nm, an increasement haze ratio as high as 48; at 800 nm, and a degradation of square resistance while the light trapping ability increases rapidly on surface of the film .The high concentration of hydrochloric acid can cause the surface of the film to exhibit a fast concave morphology and give a higher haze value .In order to improve the conductivity while maintain the higher haze ratio on surface of the film, a sputtering-compensation method was utilized to deposite the thickness of 300 nm AZO film on the textured surface of samples etched in 2;HCl for 30 s.The compensated AZO samples with high haze ratio shows a small square resistance ( less than 10 Ω/sq) , and a silicon thin film solar cell with a high efficiency 9 .24;was fabricated by using the compensated AZO film as front electrode .As a candidate of front electrode for silicon thin film solar cell , the textured AZO thin films with high haze ratio prepared by wet-etching plus sputtering-compensation method exhibit a good performance of high light trapping ability and low square resistance .

Study on Growth of PCNB Single Crystals by Solution Method

WANG Hai-hui;ZHOU Xin-yuan;ZHOU Heng-wei;HUANG Yi-neng

2017, 46(10):  1936-1940. 

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Solubility of PCNB was determined in acetone solvent .The PCNB single crystals were successfully grown by constant temperature solvent evaporation method in acetone for the first time .The results show that:there is a smaller temperature coefficient zone below 302 K, which is suitable for the growth of single crystals by constant temperature evaporation method;the PCNB single crystals with centimeter size were obtained;the IR and Raman spectra show that the crystals have not incorporated solvent;XRD analysis indicates that the lattice structure of PCNB crystals is hexagonal and have good quality .

Influence of ZnO Nanostructured Anti-reflective Coating Optimization on the Properties of Solar Cells

BAI An-qi;GUO Li-da;TANG Yang

2017, 46(10):  1941-1945. 

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ZnO nanostructured arrays were deposited on Cu ( In, Ga ) Se2 thin film solar cells by electrodeposition as anti-reflective layer .The characteristics including morphology , optical quality and reflectance were optimized by controlling the deposition potentials .The I-V results of the solar cells with electrodes show that the anti-reflective layer efficiently suppress the surface reflections and advance light absorptions utilizing the moth-eye effect formed by the subwavelength size of ZnO nanostructures , which realize the short-circuit current increased by 6 .2;, and the efficiency enhanced by 9 .9;.

Effect of Al2O3 Film Preparation Parameters on the Moisture Permeability of SiO2/Al2O3/PET Composite Films

DING Ze-liang;ZHANG Shi-miao;WANG Shuang-xiong;LIN Chang-sheng;ZHOU Feng-lin

2017, 46(10):  1946-1950. 

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Al2 O3 film and SiO2 film were deposited on PET substrates by magnetron sputtering , and SiO2/Al2 O3/PET composite films were prepared .The surface morphology and the water vapor transmission ( WVT ) rates of the composite films were characterized by scanning electron microscopy ( SEM ) and moisture permeability instrument respectively . The influences of Al 2 O3 film preparation parameters , including radio-frequency(RF) power, argon flow, vacuum degree and sputtering time on the WVT rates of SiO2/Al2 O3/PET composite films were investigated .The results show that the WVT rates decrease with the increase in vacuum degree , and firstly decreases and then increases with the increase in RF power , argon flow and sputtering time .Among the four process parameters , vacuum degree had the greatest effect on WVT rates, followed by argon flow , RF power and sputtering time .The optimal process parameters were obtained as the vacuum degree of 0.5 ×10 -3 Pa, RF power of 300 W, sputtering time of 6 min and argon flow of 70 mL· min-1 .

Effect of CaO and CaF2 on Property of the Lead-free Boron Glaze Fired at Low Temperature

WU Yu-min;DU Zhen-fei;HUANG Ding-guo;LI Guan-sheng

2017, 46(10):  1951-1954. 

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By reasonably allocating the amount of CaF 2 and CaO , the lead-free transparent glaze with better glossiness and boron opalescent glaze with better whiteness were prepared at 1120℃.The effect of CaO and CaF 2 content on transparency ( opacity ) , glossiness and fluidity of lead-free boron glaze was discussed by single factor method .The results show that CaO can increase the transparency and fluidity of the glaze because the phase separation is isuppress ,but the excess CaO addition reduce the glossiness of the glaze.CaF2 has stronger fluxing effect than CaO , which can make the quartz melt fully .But at the same time, because of the decrease of glaze viscosity , calcium feldspar and wollastonite crystals will be precipitated and the transparency of the glaze will be reduced .

Effect of Particle Size and Content of Al Powder on the Structure and Properties of SiC Ceramic Materials

LI Wen-feng;HUANG Qing-fei;HOU Yong-gai;GUO Hui-shi;DING Zhi-jing;XIE Yu-bo;ZOU Wen-jun

2017, 46(10):  1955-1958. 

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SiC ceramic materials were prepared with Al powder as the sintering aid by pressureless sintering at 1600 ℃ for 3 h.The effects of particle size and content of Al powder on the structure and properties of SiC ceramic materialswere studied .The results show that Al powder can improve the sintering and mechanical properties of SiC ceramic materials , it also plays an important role in oxidation resistance , and the Al powder with smaller particle size has a significant effect on that of SiC ceramic materials.When theparticle size and content of Al powder are 48 μm and 4wt;, respectively, SiC ceramic materials can get the best performance .The bulk density and apparent porosity are 2.69 g/cm3 and 5.8;, thenthehardness and flexural strength are 2790 HV and 189 MPa, respectively.The excellent sintering and mechanical properties of SiC ceramic materials can be attributed to the sintering effect of Al powder and the strengthening effects of the in situ formed Al 2 O3 and mullite filling in SiC particles .

WO3 with Different Crystal Structure Prepared by Thermo-decomposition Method and Its Photocatalysis Activity

YAN Song;HAN Ke-ke;ZHAO Lin;ZHANG Ying

2017, 46(10):  1959-1964. 

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H2 WO4 precursor was prepared by precipitation method using ammonium tungstate as a starting material and nitric acid as the precipitation agent .WO3 photocatalysts with hexagonal and monoclinic phase were obtained by thermal-decomposition H2WO4 at different temperatures.Crystalline phase, morphology , particle size , chemical composition , surface area and optical properties during the phase transformation from H2WO4 to WO3 were investigated by X-ray diffraction(XRD), Raman spectroscopy, differential thermal analysis-thermogravimetry ( TG-DTA ) , scanning electronic microscopy ( SEM ) , N2 adsorption-desorption , X-ray photoelectron spectroscopy ( XPS ) , and UV-Vis diffuse reflectance spectroscopy ( UV-Vis DRS ) . The results show that H 2 WO4 undergoes the following process after calcination:H2WO4→hexagonal WO3→hexagonal/monoclinic WO3→monolinic WO3.Furthermore, the photodegradation of Rhodamine (RhB) as model reaction to investigate the photocatalytic activity of WO 3 with different crystalline phase . Compared with monoclinic WO 3 , hexagonal WO 3 exhibits higher photocatalytic activity .

Phase Transition and Energy-storage Property of ( Sr0.7Bi0.2 ) TiO3 Substituted BNT-based Lead-free Ceramics

HE Jun-feng;LIANG Shan;XIE Shuai;ZHOU Shi-hao;WU Xiao-jun;BAI Chuan-wei;LI Yang;WU Wen-juan

2017, 46(10):  1965-1970. 

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Innovative binary BNT-based lead-free ceramics which is composed by (Sr0.7Bi0.2)TiO3 relaxor ferroelectric and (Bi0.5Na0.5)TiO3 ferroelectric, (1-x)(Bi0.5Na0.5)TiO3-x(Sr0.7Bi0.2)TiO3(BNT-xSBT for short, x=10mol;, 20mol;, 30mol; and 40mol;) was designed.All the BNT-xSBT ceramics were fabricated by the traditional solid-state processing route , and the effect of ( Sr0.7 Bi0.2 ) TiO3 on the structure , phase transition , ferroelectric property and energy-storage property of BNT-xSBT ceramics was investigated .The results show that BNT-xSBT ceramics exhibit pseudo-cubic phase at room temperature , and coexistence phase structure of polar rhombohedral ( R3c) and non-polar tetragonal ( P4bm) for BNT-xSBT ceramics was identified by dielectric and ferroelectric property .BNT-xSBT ceramics with co-occupied in A-site are relaxor ferroelectric, and Tm decreases with increasing of (Sr0.7Bi0.2)TiO3 content. The dielectric abnormal peak at low temperature ( Td ) derives from a slow transition which is caused by structure (rhombohedral and tetragonal) fluctuation.With increasing of (Sr0.7Bi0.2)TiO3 content, Td of BNT-xSBT ceramics decreases , tetragonal phase and non-polar nano-regions increases , resulting in weak ferroelectric property and distorted ferroelectric hysteresis loop .For x =30mol;, BNT-xSBT ceramics show a large Pmax =26.8 μC/cm2 , a small Pr =1.4 μC/cm2 , good energy storage density W=0.74 J/cm3 and energy storage efficiency η=68.5;(@70 kV/cm).

Numerical Simulation and Analysis of Thermal-Electric Behavior of Silicon Rod in Siemens Reactor

ZHOU Yang-min;NIE Zhi-feng;XIE Gang;LI Ya-guang;HOU Yan-qing

2017, 46(10):  1971-1977. 

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In the production of polysilicon by application of modified Siemens process , all the energy for polysilicon chemical vapor deposition is supplied by the heat generation on silicon rods which are heated up by the passage of current .The coupling model of thermal and electromagnetic field for the silicon rods located in a 24-rod polysilicon reduction furnace was developed by coupling joule heating equation controlled by frequency and heat dissipation ( radiation and convection ) .Furthermore , the results were evaluated to be valid by comparing with industrial data .The influences of rod radius , AC frequency and wall emissivity on temperature and current density profile within rod were studied .The interesting results show that the skin effect begins to appear when the radius of the silicon rods increases to the value of skin depth.High frequency current sources can generate an even temperature profile and a higher deposition radius of rods can be obtained .The temperature difference between the center temperature and surface temperature of rods increases for a low AC frequency with increasing wall emissivity while the temperature difference has a weak influence on the temperature profile at a high AC frequency .

Study on the Optical and Magnetic Properties of the Cu Substitution Doping, Vacancy Doping SnO2 and Co-doping SnO2 with Cu, S

WEI Li-lai;HUANG Yi;ZHANG Bang-jian;MIAO Feng

2017, 46(10):  1978-1983. 

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In terms of density functional theory , the electronic structure and optical properties of the Cu substitution doping and vacancy doping SnO 2 were tested , and also the combination of these two types of doping methods were researched .Considering the magnetism of SnO 2 , the magnetic properties after the SnO2 doped with Cu , S were investigated .Calculation shows that the two ways of doping both make the SnO2 have semimetal property and be a strong role in exchanging the Cu atom with the O atoms surrounding with it which contributes to the density of states mainly near the Fermi level .By contrast , the crystal cell volume after vacancy doped is slightly bigger than the substitution doped one .Meanwhile the light energy loss is lower too .The calculation results show that the mixed each Cu atoms will produce 0. 46 μB magnetic moment , and one S atom will introduce 0.36 μB, and the O atoms around the Cu atom also have a certain contribution to the magnetic moment . Through the analysis , the system of the magnetic source mainly comes from Cu-3d and S-3p, and the strong coupling effect between Cu-3d and O-2p.

Self-assembly and Stability of SiO2 Binary Photonic Crystals

WU Yuan-ting;LI Meng-long;YUAN Jun;LU Jian;WU Peng-hong;LIU Chang-qing;WANG Xiu-feng

2017, 46(10):  1984-1987. 

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Different size of SiO2 colloidal spheres were fabricated by the St ?ber method, SiO2 binary photonic crystals were fabricated by multiple vertical deposition method .The micromorphology of binary photonic crystals were characterized by field emission scanning electron microscope ( FE-SEM ) .The formation of binary colloidal crystals was studied .The effects of interfacial force and interaction force between colloidal spheres on the preparation of stable structures were studied .The results show that SiO 2 binary photonic crystals have a more orderly and stable structure .The interaction force between colloidal spheres increases with the increase of the particle size .The colloidal spheres with large particle size are more beneficial to the formation of stable structures .

Preparation and Photocatalytic Properties of NiCo2 O4 Nanorods

GENG Tao;WANG Xin-ze;MEI Jie;SHEN Fei

2017, 46(10):  1988-1991. 

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NiCo2O4 precursor sample was synthesized using CoCl2· 6H2O, NiCl2· 6H2O, urea and polyethylene glycoland as raw material by hydrothermal method.After the heat treatment, the NiCo2O4 sample was obtained. The NiCo2 O4 sample with different morphologies was prepared by changing reaction temperature .The structures and morphologies of nanorods NiCo 2 O4 were investigated by X-ray diffraction ( XRD ) and scanning electron microscopy (SEM).The results indicate after the heat treatment at 300℃, the asobtained nanorods NiCo2 O4 have porous surfaces with a diameter of about 100 nm.Comparing the degradation efficiency of Rh B under UV irradiation with nanorods NiCo2O4 photocatalysts possess higher photocatalytic efficiency.The results show that after 120 minutes under UV irradiation, the degradation rate of Rh B is close to 93.1;.

Study on Optimization of Synthesis Conditions of Phosphor SrAl2Si2O8:Eu2+for White LED

WANG Fei;TIAN Yi-guang;ZHANG Qiao

2017, 46(10):  1992-1998. 

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A series of luminescence phosphors Sr 0.975 Al2 Si2 O8 :Eu2+0.025 were prepared by solid-state reaction, the effect of the fisrt firing temperature ( T1 ), the fisrt firing time ( t), the second firing temperature(T2) and the concentration of flux H3BO3(W) on the spectrum characteristics and structure of the sample was investigated .The results show that the samples are monoclinic SrAl 2 Si2 O8 , emission intensity, grain size and intensity of X-ray diffraction of the phosphor increase with T1 , t, T2 and W, show the trend of increasing first and then decreasing .When the T1 =1000 ℃, t=150 min, T2 =1250℃, W=6wt;, the synthesis of phosphor Sr 0.975 Al2 Si2 O8:Eu2+0.025 luminescence intensity is strongest , the synthesis conditions are optimized .

Preparation and Photocatalytic Properties of Zn-doped Nano TiO2 Materials

YANG Zai-zhi;FU Xiao-ming;LI Xiang-cheng

2017, 46(10):  1999-2002. 

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Zn-doped nano TiO 2 photocatalysts was prepared by hydrothermal method . The phase composition, microstructure and photocatalytic activity were characterized by XRD , SEM, TEM and UV-Vis.The results show that the samples are consists of only single anatase phase , the grain size of TiO 2 sample is from 6 nm to 10 nm, the absorption wavelength of sunlight increases to 510 nm, and the degradation rate of methyl orange run up to 92;.Thus, with the increase of the utilization efficiency of solar radiation , the photocatalytic effect is enhanced .

Preparation and Permeation Properties of Magnesium Slag Based Porous Ceramics Used for Filtration

HAI Wan-xiu;HAN Feng-lan;JIANG Mu-jun;BAI Liu-yang

2017, 46(10):  2003-2007. 

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The porous ceramics were prepared using magnesium slag and flyash as raw materials .The porosity parameters , properties of sintering , mechanical and permeation were studied and the microstructure of the porous ceramics was observed .The influence of sintering temperature , molding pressure , ratio of the raw material , and additives on the properties of the porous ceramics were studied . The results show that the magnesium based porous ceramics with 90;solid waste could be prepared after holding for 4 h at 1150℃.The molding pressure affect the porosity , water absorption , and density of the porous ceramics strongly .With the ratio of magnesium slag and flyash equaled to 7:2 , the combination property of the porous ceramics is the best .The adding of carbide slag and carbon powder is able to homogenize distribution of the pore , refine diameter of the pore , and increase the porosity and the properties of gas filtration of the porous ceramics .

Preparation and Acoustic Properties of Porous Ceramic Prepared by Low Grade Non-metal Ore

JING Qiang-shan;TANG Yi-tian;TIAN Yong-shang;CHEN Jing-cao;FANG Lin-xia

2017, 46(10):  2008-2013. 

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Porous acoustic ceramic was prepared with magmatic soil , tuff and glass power as the main raw materials.Silicon carbide and straw powder were used as the foaming agent and pore-forming agent, respectively .Based on the thermal analysis of raw materials , single factor method was employed to study the effects of sintering temperatures , holding time, dosage of pore forming agent , amount of foaming agent , sample thickness ,porosity and pore size on the properties of the sample sound absorption property . X-ray powder diffraction ( XRD) and ultra depth of the field techniques were used to characterize the phase compositions and morphology of sintered samples .The results show that favorable performance of porous acoustic materials could be achieved by optimized conditions , with sinter at 1150 ℃ for 50 min, the forming agent and pore-forming agent is 1.4;and 6;, and the sample thickness is 30 mm.For this optimal sample, the average sound absorption coefficient is 0.34 assess at the frequency of 200-4000 Hz. Furthermore , the first sound absorption peak shifted to low frequency direction gradually when the sample thickness is increase .

Hydrothermal Synthesis and Fluorescence Properties of Li+, Bi3 +Doped LaVO4:Eu3+Nano-phosphor

TAO Ping-fang;ZHENG Yao-liang;FENG Yu-qin;WANG Rong-fang;QIN Li-qin

2017, 46(10):  2014-2019. 

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LaVO4:Eu3+nano-phosphor doped with metal ions ( Mn+=Li+, Bi3 +) were synthesized by hydrothermal method using lanthanum nitrate , europium oxide , lithium nitrate , bismuth nitrate and ammonium metavanadate as raw materials .The as-prepared samples were characterized by XRD , SEM, FTIR, and FL.The effects of the different doping concentration of metal ions ( Mn+ =Li+, Bi3+), reaction temperature and reaction time on the fluorescence of the LaVO 4 :Eu3+ phosphor were investigated.The optimum conditions for the synthesis of Li +and Bi3 +doped LaVO4:Eu3+phosphors were discussed .It is found that the synthesized product is zircon structure of tetragonal phase ( t-) LaVO4 .The luminescence intensity of LaVO 4:Eu3+is improved by codoping of Mn +.It was observed that the LaVO4:5;Eu3+, 4;Li+, LaVO4:5;Eu3 +, 2;Bi3+ nano-phosphor synthesized under hydrothermal condition at 180 ℃for 24 h exhibited the strangest luminescence intensity .

Hydrothermal Synthesis and Photoluminescence Properties of Urchin-like Eu2O3/Ag3VO4 Composite

LI Ying-jie;ZHU Li-hua;LYU Ren-jiang;ZHAO Nan;ZHENG Wei-wei;WANG Yu-jia

2017, 46(10):  2020-2024. 

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Using AgNO3 and NH4 VO3 as raw materials, Eu2 O3 acted as metal source , P123 as the structure -director agent, ethyl alcohol and water as mixture solvent, urchin-like Eu2O3/Ag3VO4 microspheres were obtained by hydrothermal method , and the conditions of synthesis were also studied . The samples were characterized by SEM , XRD and XPS , moreover , the formation mechanism of urchin-like Eu2 O3/Ag3 VO4 was discussed , too.The results show that the diameter size of prepared urchin-like Eu2 O3/Ag3 VO4 microspheres is about 4-5 μm when the reaction temperature is 80 ℃ and the reaction time is 10 h.The effect of photoluminescence properties of Eu 3+ doping content in the samples was investigated , and when the Eu 3+doping content was 4;, the samples have the best photoluminescence properties .

Preparation and Fluorescence Properties of SrMoO4:Eu3+Phosphor by Modified Co-precipitation Method

HE Xiao-yan;ZHANG Tao;MU Dong-di;OU Yang-yan

2017, 46(10):  2025-2029. 

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A series of SrMoO 4 :Eu3 +red fluorescent materials were synthesized by the improved coprecipitation method and the addition of modifier .The synthesized samples were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and fluorescence spectrophotometer ( PL ) . The relationship between the fluorescence properties and the types of modifiers , modifier addition , reactant concentration and activation of ion doping and other reaction parameters was explored . The results show that SrMoO 4:Eu3+has four groups of Eu 3+ion excitation peaks at 420-750 nm under the excitation of excitation light at a wavelength of 271 nm, and the strongest peak emits red light at 616 nm. The fluorescence performance was the best when the addition was 3 mL polyethylene glycol ( PEG) .With the increase of Eu 3+doping amount , the characteristic emission peak at 616 nm shows the first increase and then decreases .When the Eu 3+doping amount is 11;, the maximum value is reached .Emission intensity of Eu3+doped SrMoO4 phosphor at 616 nm is the strongest, indicating that SrMoO4:Eu3+is a kind of red fluorescent material which can be applied to white LED .

Preparation and Hydrophobic Modification of Monodisperse SiO2 Nanospheres

YANG Chun;SHAO Ting;LUO Xuan;CAO Lin-hong;JIANG Xiao-dong

2017, 46(10):  2030-2036. 

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Monodispersed SiO 2 nanospheres with diameters of 200-800 nm were prepared by improved St?ber method where the tetraethyl silicate ( TEOS ) , deionized water and ethanol were used as the raw materials.To avoid aggregation , the obtained wet nanospheres were dried by vacuum freeze drying technique afterward .The supercritical ethanol was used to modify the surfaces of the SiO 2 nanospheres as hydrophobic .The morphologies and sizes of the nanosphers were investigated by the scanning electron microscope ( SEM ) . And the size distribution of the pores was investigated by N 2 absorption and desorption measurement .The hydrophobic properties of the particles were characterized by measuring their contact angle to water .Fourier transform infrared spectroscopy ( FTIR ) was used to detect the chemical groups on the surfaces of the particles . The results show that the diameter of the SiO 2 nanospheres initially increase and then decrease as the amount of the second addition of TEOS increase . The FTIR results show that by supercritical ethanol treatment , the surface of SiO 2 nanospheres was grafted with alkyl groups successfully , which make the particles show hydrophobic properties .The smallest treated particles show the best hydrophobic performance , with their contact angle to water as high as 149 °.The amount of the treated particles has no obvious influence on the result .With this method , more than 12 g particles could be treated as hydrophobic ( contact angle to water as high as 140°) in one batch , which meet the laboratory-scale demand quite well .Since the hydrophobic SiO 2 nanospheres prepared by us are easy to be dispersed and had the advantage of monodispersity , they would have a potential application in the field of 3-DOM.

Synthesis of NiFe2O4/g-C3N4 for the Photocatalytic Degradation of Methyl Orange under Visible-light Irradiation

LIU Yong;SONG Yu-chun;HUANG Min;HUANG Ming;FU Xiao-jin;ZHENG Xiao-gang

2017, 46(10):  2037-2044. 

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The supported photocatalysts NiFe 2 O4/g-C3 N4 with different NiFe2 O4 content were synthesized by impregnation method and performed on the photocatalytic degradation of methylene orange ( MO ) under visible-light region.Several techniques, including XRD, FT-IR, N2-adsorption, ICP-IOS SEM, TEM and XPS, were employed to obtain the physical and chemical properties of NiFe 2 O4/g-C3 N4 samples.The results indicate that the supported catalyst NiFe 2 O4/g-C3 N4 exhibited higher photocatalytic activity of MO compared to NiFe 2 O4 and g-C3 N4 .The catalytic activity of NiFe 2 O4/g-C3 N4 sample increased and then decreased with the increasing NiFe 2 O4 doping amount ranged from 0.5wt; to 5. 0wt;, of which the 2-NiFe/CN sample with 2.0wt; NiFe2 O4 loading exhibited the best degradation activity and stability for the photocatalytic degradation of methyl orange (5 mg· L-1 ) under visible light irradiation.It's ascribed to the heterojunction structure of NiFe 2 O4/g-C3 N4 sample formed between narrow energy band (1.5 eV) of NiFe2 O4 and wide energy band (2.7 eV) of g-C3 N4 , which facilities the speed transmission of photoexcited carriers at the interface of NiFe 2 O4 and g-C3 N4 , and enhances the effective separation of electron-hole pairs.

Effect of Ti on the Wettability and the Holding Force in Diamond/Al-Ti Alloy

XIAO Chang-jiang;LI Xiao-long;DOU Zhi-qiang

2017, 46(10):  2045-2049. 

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The effect of Ti on the wettability in diamond/Al-Ti system was firstly studied in this paper;then, taking Al-Ti with different Ti content as matrix , adding Ti with different content and diamond , the bits without and with diamond were fabricated by a vacuum hot pressing equipment .The flexural strength of bits was measured and the holding force of Al-matrix bonded to diamond was calculated .The results show that with the increasing Ti content , the wettability between Al-Ti alloy and diamond is obviously improved.When the content of Ti is 5wt;, the combined state between Al-Ti alloy and diamond is the best , so the flexural strength values of the bits without and with diamond are both the highest and they are 135 MPa and 102 .1 MPa respectively;moreover , the holding force coefficient is also the largest and the value is up to 75 .6;.

Effect of Deposition Temperature on SiO2 One-dimensional Nanomaterial Prepared by Thermal Evaporation Method

LYU Hang;LIU Qiu-ying;YANG Xi-bao;ZHAO Jing-long;WANG Qiu-shi;LU Xiao-dong;YAO Zhen;LYU Jun-chao

2017, 46(10):  2050-2053. 

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Large area SiO2 nanowires and SiO 2 nanorods were successfully synthesized on the surface of N-type silicon wafer by the thermal evaporation method .The as-synthesized samples were systematically researched by X-ray powder diffraction ( XRD ) , scanning electron microscopy ( SEM ) , electron energy-dispersive(EDX), Raman spectroscopy (RS) and photoluminescence (PL).The results indicate that the structures and morphologies of the product are closely related to the growth parameters by this method .As the deposition temperature decreases , the length of the nanowires becomes shorter , and finally showing a rod-like structure .Furthermore , the unique optical properties of SiO 2 nanostructures were also studied . This study is important for improving the performance of optoelectronic semiconductor devices .

Preparation and Modified Development of Nano ZnO

ZHANG Xiong-bin;HE Xin-hai;CHENG Jia-ji

2017, 46(10):  2054-2057. 

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The paper reviewed the preparing techniques of nanometer ZnO . The advantages and disadvantages were compared , the works that nanometer ZnO of modifying was reviewed .The future research and its development trend were proposed .

Effect of Pr-doping Content on the Properties of Pr-ZrSiO4 Yellow Pigment

DONG Wei-xia;BAO Qi-fu;GU Xing-yong;QIU Bo-xin;YI Yu-ru

2017, 46(10):  2058-2061. 

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Zirconium praseodymium yellow ceramic pigment precursor was solvothermal prepared by using zirconium silicate and tetraethyl orthosilicate as the main raw material and praseodymium oxide as the color agent, and then was obtained by calcining at 1050 ℃.Effects of the Pr-doping contents on the properties of the samples were studied .The microstructure of the samples were characterized by scanning electron microscope and X-ray diffract pattern .The properties of the samples were analyzed by the colorimetric analysis instrument , particle-size analyzer and ultraviolet visible light spectrum analyzer .The results show that compared with other samples , the sample prepared with 0 .15 g Pr-doping has the higher crystallinity , smaller and more uniform particle size , resulting in the stronger absorption of blue and purple light at 400-480 nm and thus exhibits a pure yellow hue .

Research on the Thermal Conductivity of SiC/Al Composite

WANG Tao

2017, 46(10):  2062-2066. 

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High thermal conductivity SiC/Al composites were prepared by presureless infiltration method , the crystal phases , micrographs and thermal conductivity were analysed by XRD , SEM and laser thermal conductance instrument .The effect of SiC particle size , shape , volume fraction , Mg content and the pre-oxidation on thermal conductivity of samples were studied .The results show:the thermal conductivity of samples can be as high as 172 .27 W/( m · k ) and meet the eletronic packing materials requirements with suitable raw materials and process parameters .

Research Progress of Traditional Alloy Type Thermoelectric Materials

WANG Mei-han;WANG Xin-yu;LEI Hao;TAI Kai-ping;HOU Zhao-xia

2017, 46(10):  2067-2072. 

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With the diversification of thermoelectric materials preparation methods and the development of characterization technologies , Traditional alloy type thermoelectric materials with excellent performance become the best candidate among various thermoelectric materials , which shows a higher thermoelectric properties and conversion rate .The traditional metal alloy type thermoelectric materials was introduced according to the working temperature , which were classified into low temperature thermoelectric material Bi2 Te3 , medium temperature thermoelectric material PbTe and high temperature thermoelectric material SiGe.Then, the thermoelectric properties'optimization methods were reviewed and discussed .Finally, the applications of thermoelectric devices based on semiconductor metal alloy were mentioned .The future development of semiconductor metal alloy thermoelectric materials was proposed .

Influence of Annealing on the Properties of Silicon Carbide at High Temperature and High Pressure Condition

ZHENG You-jin;WANG Li-juan;WANG Fang-biao;ZUO Gui-hong;HUANG Hai-liang

2017, 46(10):  2073-2076. 

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The silicon carbide synthesized by CVD method was as raw materials under high temperature and high pressure conditions , which was to explore the influence of annealing temperature on the properties of silicon carbide .The result show that the color of the silicon carbide change from pale green to colorless with the increase of annealing temperature , meanwhile , the density and the compressive strength of silicon carbide increase greatly .By Raman spectroscopy detection , the structure of anneal silicon carbide has not change , and the intensity of Raman peak of 15R-SiC at 798.6 cm-1 decrease, at the same tame , the intensity of Raman peak of 4 H-SiC at 970 cm-1 increase .

Research Progress on the Solid-liquid Interface in the Crystal Growth of Polycrystalline Silicon

ZHANG Fa-yun;RAO Sen-lin;WANG Fa-hui;GONG Hong-yong;HU Yun;CHEN Xiao-hui;LIU Jun

2017, 46(10):  2077-2082. 

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The development on the crystal growth of polycrystalline silicon as discussed , and the growth mechanism on the polycrystalline silicon during the directional solidification process was analyzed .Then it focuses on the morpholgy of solid-liquid interface , imputity distribution , mathematical model , numerical simulation and the effect of external field on interface-controlled for polycrystalline silicon during the solidification process , and summarizes the research on the interface in the crystal growth of polycrystalline silicon at the domestic and abroad .Finally, the paper proposes the development prospect of solid-liquid interface controlled in the crystal growth of polycrystalline silicon .

Controllable Synthesis of Co3O4 Octahedra with the Assistance of C2 O2-4

ZHOU Hai, KANG Min, WANG Man-li, WU Dong, LYU Bao-liang

2017, 46(10):  2083-2089. 

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Co3 O4 octahedra exposing eight ( 111 ) facets were hydrothermally synthesized with the assistance of C 2 O2-4 .The prepared samples were characterized and analyzed by means of XRD , SEM, TEM and HRTEM.The results indicate that the Co3O4 octahedra exhibited cubic phase with high crystallinity.The influence of reaction time, reaction temperature and C2O2 -4 concentration on the morphology of Co 3 O4 were investigated in detail .It is prove that C 2 O2-4 would preferably adsorb on the (111) facets of Co3O4 nuclei, which would then restrict the further growth of (111) facets due to the larger space of C2O2 -4 than hydroxyl groups leading to the exposure of (111) facets.The present Co3O4 octahedra could catalyze the thermal decomposition of ammonium perchlorate ( AP) effectively due to the exposure of high energy facets .

Research on Surface Texture of Multicrystalline Silicon by Reactive Ion Etching

ZHANG Ting;GUO Yong-gang;QU Xiao-yong;CHEN Lu;WANG Ju-liang

2017, 46(10):  2090-2094. 

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The experiment was based on ( Reaction Ion Eatching ) RIE technology to prepare polycrystalline silicon wafer with nano scale , the surface texture structure can obviously reduce the reflectivity and improve the short-circuit current of crystalline silicon cells .The experiment specifically refers to the etching of polysilicon wafers in the same mixed acid solution to remove surface damage , and used RIE technology to make texture with different size , then we adjusted the cleaning process and cleaned the wafer by according to the different texture to prepare cells .Finally we find that if the texture structure is very minimum , the damage on wafer can not be stripped completely and the antireflective SiNx is hard to deposition .The experiment results show that when prepared cells by RIE technology , the minimum texture structure and lowest reflectivity is not good , but the texture size of Nano pit should be controlled at 240 nm to 360 nm to match the cleaning and deposition of antireflective coatings more effectively , to be better made polycrystalline cells of high conversion efficiency .