数字农科院2.0

Regulation of receptor function in NiCo2O4-SnO2 heterojunction for H2S detection at room temperature

文献类型： 外文期刊

作者： Liu, Jianqiao;Sun, Yue;Deng, Shuai;Zhang, Kuanguang;Ding, Yang;Fu, Ce;Wang, Junsheng;Zhang, Qianru

作者机构：

关键词： Receptor function;p-n transition;Heterojunction;Room temperature detection

期刊名称： CERAMICS INTERNATIONAL

ISSN： 0272-8842

年卷期： 2024 年 50 卷 23 期

页码：

收录情况： SCIE（2024版） ; ; EI（2024版）

摘要： In recent years, the World Health Organization has increasingly emphasized air quality in production environments, leading to heightened societal demands for monitoring of pollutant gases at room temperature. Traditional semiconductor gas-sensitive materials, such as tin oxide (SnO2), have their gas-sensing performance largely limited by their receptor functions, resulting in common issues like low response and poor recovery at room temperature. Spinel-type bimetallic oxides, such as nickel cobaltate (NiCo2O4), offer a unique solution due to their rich adsorption sites on the surface, which provide distinctive receptor functions for detecting toxic gases at room temperature. Herein, NiCo2O4 is synthesized via a one-step hydrothermal method, with a porous spherical cluster structure, and combined with SnO2 to form a heterojunction. The NiCo2O4-SnO2 heterojunction film gas sensor exhibits excellent gas-sensing performance for H2S at room temperature, including high response, short response time, good repeatability, and selectivity. Additionally, the unique receptor functions of the NiCo2O4 were analyzed through first-principles calculations, revealing a semiconductor p-n conversion phenomenon in the presence of H2S gas. The composite also demonstrates a conversion from p-n heterojunction to nn homojunction during the sensing process, enhancing its gas-sensing performance. This work not only addresses the receptor function limitations of traditional gas-sensitive semiconductor but also provides a feasible approach for controlling carrier types in semiconductors.

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