Innovative development on a p-type delafossite CuCrO2 nanoparticles based triethylamine sensor
Innovative development on a p-type delafossite CuCrO2 nanoparticles based triethylamine sensor
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DOI：
10.1016/j.snb.2020.128743
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发表时间：
2020-08
影响因子：
8.4
通讯作者：
Hai Liu;Xun Cao;Hao Wu;Bolong Li;Yi Li;Wenhuan Zhu;Zhi Yang;Yizhong Huang
中科院分区：
文献类型：
--
作者：
Hai Liu;Xun Cao;Hao Wu;Bolong Li;Yi Li;Wenhuan Zhu;Zhi Yang;Yizhong Huang
金属氧化物半导体被认为是用于工业或医疗保健中检测挥发性有机化合物的气体传感器组装的优秀基础物质，但受到其低选择性和高操作温度的限制。采用水热法合成了一种具有p型结构的铜铁矿CuCrO2，该材料在140 ℃低温下对三乙胺具有高的选择性、稳定性和高的动力学响应。原位加热光谱分析和基于密度泛函理论的第一性原理计算辅助下的系统气敏测试表明，这种三元氧化物的气敏过程中采取了独特的协同机制，而不是环境氧气的离子吸附效应。它开始于气体分子吸附到Cr的不饱和配位金属位点，然后在Cu上脱氢，导致氧空位的形成。这种气敏机理成功地解释了CuCrO2纳米颗粒作为三乙胺传感器的特殊性能。这项工作提供了一种探索性的方法，在原子尺度上指定的气体分子和敏感层的相互作用，这为设计和开发更先进的气体传感器的其他材料系统提供了方法。
Metal oxide semiconductors are recognized as an excellent underlying substance for the assembly of gas sensors to detect the volatile organic compounds in industry or healthcare, but are constrained by their low selectivity and high operation temperature. In the present paper, we present a nanostructured p-type delafossite CuCrO2, synthesized by the hydrothermal method, that provides a high selectivity, stability and high dynamic response to triethylamine at a low temperature of 140 ℃. In-situ heating spectrum analysis and systematic gas sensing tests with the assistance of first principles calculations based on the density functional theory demonstrate that this ternary oxide takes a unique synergy mechanism for gas sensing process, rather than the ionosorption effect of ambient oxygen. It starts with the adsorption of gas molecules to the unsaturated coordinative metal sites of Cr, which is then followed by the dehydrogenation on Cu resulting in the formation of oxygen vacancies. This gas sensing mechanism successfully explains the extraordinary properties of CuCrO2nanoparticles as a triethylamine sensor. This work delivers an exploratory approach to the assigned interaction of gas molecules and the sensitive layer at atomic scale, which provides ways to design and develop more advanced gas sensors for other material systems.