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JOURNAL OF SYNTHETIC CRYSTALS ›› 2021, Vol. 50 ›› Issue (12): 2339-2346.

• Research Articles • Previous Articles     Next Articles

Theoretical Analysis of 4d Metal Doping to Enhance the Optical Sensing Properties of SnO2 to Acetone

FU Yue1,2, FENG Qing1,2, MOU Zhiyao1,2, GAO Xin1,2, ZHU Hongqiang1,2   

  1. 1. Chongqing Key Laboratory on Optoelectronic Functional Materials, College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China;
    2. Key Laboratory of Optics and Engineering, Chongqing Normal University, Chongqing 400047, China
  • Received:2021-08-02 Online:2021-12-15 Published:2022-01-06

Abstract: Early diabetic patients can be screened out by detecting trace amounts of acetone in human exhaled breath. Therefore, it is a research hotspot to find materials that can detect trace amounts of acetone gas. This paper calculates rutile SnO2(110) surface charge population (redox performance), density of states, optical properties and adsorption stability after adsorbing acetone molecules, which doped by 4d metal impurities Mo, Ru, Rh, Ag. The effect of 4d metal impurity on optical gas sensing properties was discussed. The results show that: each impurity has varying degrees of influence on the surface redox performance; 4d electrons form impurity peaks near Fermi level. The impurity peak introduced by Ru-4d electrons is the largest, which closest to Fermi level, and the band gap improvement is the greatest; compared to Mo, Rh, and Ag impurity, Ru impurity has the best optical properties in the visible light range (400~760 nm); acetone molecules can be adsorbed on all doped surfaces spontaneously, and the stability order is: Ru>Rh>Ag>Mo. The conclusion shows that Ru-doped SnO2 is a more effective optical gas detection material for acetone, which is expected to improve the efficiency of early detection and diagnosis of diabetes by detecting acetone in human exhaled breath.

Key words: optical material, acetone gas, metal impurity, rutile, density functional theory, optical gas sensing

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