Preparation and study of ammonia gas sensor based on ZnO/CuO heterojunction with high performance at room temperature

异质结 材料科学 分子 检出限 吸附 半导体 氧气 光电子学 纳米技术 物理化学 化学 有机化学 色谱法
作者
Cheng Cao,Chu Chen,Hongyan Zhang,Yong Zhang
出处
期刊:Materials Science in Semiconductor Processing [Elsevier BV]
卷期号:146: 106700-106700 被引量:42
标识
DOI:10.1016/j.mssp.2022.106700
摘要

An ammonia (NH3) gas sensor based on ZnO/CuO (ZC) heterojunction was prepared by hydrothermal method and the sensing mechanism was studied by first principle calculations based on density function theory (DFT). Experiments show that NH3 sensor based on ZC heterojunction has low detection limit (0.39 ppm), fast response/recovery time (2.3 s/2.1 s), high sensitivity, good selectivity, strong stability and high humidity resistance at room temperature (RT). Compared with ZnO, ZC has more oxygen free radicals appeared on surface of heterojunction, and has redox reactions with NH3 molecules to release more electrons to improve sensitivity of ZC. Calculations show that excellent performance is mainly due to the strong adsorption energy of ZC heterojunction to NH3 detection. The polarity of NH3 molecules is enhanced under strong built-in electric field formed by ZC heterojunction which absorbs more NH3 molecules to react with oxygen radicals on surface of ZC and induce high response of ZC to NH3 molecules. This study indicates that ZC heterojunction structure can effectively improve ZnO sensors for NH3 detection at RT, which is helpful for application of metal oxide semiconductor.
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