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Crystalline-to-Amorphous Phase Transformation in CuO Nanowires for Gaseous Ionization and Sensing Application
ACS Sensors ( IF 8.2 ) Pub Date : 2021-10-27 , DOI: 10.1021/acssensors.1c01638 Hai Liu 1 , Haoyu Zhang 1 , Wenhuan Zhu 2 , Maolin Bo 3 , Tingting Zhao 1
ACS Sensors ( IF 8.2 ) Pub Date : 2021-10-27 , DOI: 10.1021/acssensors.1c01638 Hai Liu 1 , Haoyu Zhang 1 , Wenhuan Zhu 2 , Maolin Bo 3 , Tingting Zhao 1
Affiliation
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We report a dramatic reduction of operation voltage of a CuO nanowire-based ionization gas sensor due to the crystalline-to-amorphous phase transformation. The structural change is attributed to the ion bombardment and heating effect during the initial discharge, which brings about the formation of abundant nanocrystallites and surface states favoring gaseous ionization. The gas-sensing properties of the CuO nanowire sensor are confirmed by differentiating various types or concentrations of volatile organic compounds diluted in nitrogen, with a low detection limit at the ppm level. Moreover, a sensing mechanism is proposed on the basis of charge redistribution by electron-gas collision related to the specific ionization energy. The insightful study of the electrode microstructure delivers an exploratory investigation to the effect of gas ionization toward the discharge system, which provides new approaches to develop advanced ionization gas sensors.
中文翻译：
用于气体电离和传感应用的 CuO 纳米线的晶体到非晶相转变
我们报告了由于晶体到非晶相的转变，基于 CuO 纳米线的电离气体传感器的工作电压显着降低。结构变化归因于初始放电过程中的离子轰击和加热效应，导致形成丰富的纳米微晶和有利于气态电离的表面状态。CuO 纳米线传感器的气敏特性通过区分在氮气中稀释的各种类型或浓度的挥发性有机化合物来确认，检测限低至 ppm 级。此外，基于特定电离能相关的电子-气碰撞电荷重新分配，提出了一种传感机制。
更新日期：2021-11-26
中文翻译：
用于气体电离和传感应用的 CuO 纳米线的晶体到非晶相转变
我们报告了由于晶体到非晶相的转变，基于 CuO 纳米线的电离气体传感器的工作电压显着降低。结构变化归因于初始放电过程中的离子轰击和加热效应，导致形成丰富的纳米微晶和有利于气态电离的表面状态。CuO 纳米线传感器的气敏特性通过区分在氮气中稀释的各种类型或浓度的挥发性有机化合物来确认，检测限低至 ppm 级。此外，基于特定电离能相关的电子-气碰撞电荷重新分配，提出了一种传感机制。
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