Synthesis of Potato-Based Carbon Quantum Dots, Mn Doping and Their Application in Ag+ Detection

Abstract

Abstract: In this study, carbon quantum dots (CQDs) were prepared using potato as carbon source via hydrothermal method, and then Mn-doped CQDs (Mn-CQDs) were prepared by the addition of manganese carbonate as dopant in the reaction system. CQDs and Mn-CQDs were characterized by transmission electron microscopy (TEM), X-ray diffraction spectroscopy (XRD), X-ray photoelectron spectroscopy (XPS), UV-Vis absorption spectroscopy, photoluminescence (PL) spectroscopy, and infrared spectrometer. The results show that CQDs and Mn-CQDs are spherical with an average particle size of 3 nm to 5 nm. Mn doping enhanced the intensity and stability of photoluminescence of CQDs. The maximum excitation wavelengths of CQDs and Mn-CQDs are 435 nm and 395 nm, and the corresponding emission wavelengths are 525 nm and 465 nm, respectively. In the application of the detection of metal ions, both CQDs and Mn-CQDs exhibit good selectivity to Ag⁺, and the low detection limits of CQDs and Mn-CQDs to Ag⁺ are 0.064 μmol/L and 0.027 μmol/L, respectively, indicating the relatively high sensitivity of Mn-CQDs in the trace detection of Ag⁺compared to CQDs.

Key words: carbon quantum dot, potato-based carbon quantum dot, hydrothermal method, Mn doping, trace detection, Ag⁺detecting

CLC Number:

X832
O657.3

LI Jiayao, HAN Weijie, YANG Zhouping, SHI Yangfan, LU Shiping, LIU Xinmei. Synthesis of Potato-Based Carbon Quantum Dots, Mn Doping and Their Application in Ag⁺ Detection[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(11): 2093-2102.

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Synthesis of Potato-Based Carbon Quantum Dots, Mn Doping and Their Application in Ag⁺ Detection

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