Pr-doped In2O3 nanocubes induce oxygen vacancies for enhancing triethylamine gas-sensing performance

被引：0
作者：
Chao Wang
Wu Wang
Ke He
Shantang Liu
机构：
[1] Wuhan Institute of Technology,School of Chemistry and Environmental Engineering, Key Laboratory for Green Chemical Process (Ministry of Education), Hubei Key Lab of Novel Reactor & Green Chemical Technology
来源：
Frontiers of Materials Science | 2019年 / 13卷
关键词：
gas sensor; Pr-dope In; O; triethylamine; oxygen vacancy;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Nanocubes derived from pure In2O3 and xPr-In2O3 (x = 1, 2, 3 and 5 mol.%) were synthesized using a facile hydrothermal method, followed by calcination. The morphological and structural characterization demonstrated that as-synthesized samples presented regular cubes that decreased in size with the increase of the Pr doping. The data showed that the sensing performances of sensors based on In2O3 were notably improved after the Pr doping. Among them, the sensor based on 2 mol.% Pr-In2O3 had the best sensing performance towards the triethylamine (TEA) gas, including a high response (Ra/Rg = 260 to 100 ppm TEA gas, which is about 12 times higher than that of the sensor based on pure In2O3), a short response time (2 s), and a low detection limit (0.2 ppm) at 350 °C. The mechanism responsible for the enhancement of sensing performance was attributed to the improvement of the vacancy content of 2 mol.% Pr-In2O3, which promoted the oxidation–reduction reaction with the TEA gas that occurred on the materials surface.
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页码：174 / 185
页数：11
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