甲苯
材料科学
检出限
纳米颗粒
选择性
微电子机械系统
响应时间
化学工程
氧传感器
氧气
纳米技术
分析化学(期刊)
光电子学
催化作用
色谱法
有机化学
计算机科学
化学
计算机图形学(图像)
工程类
作者
Xiaofan Liu,Jian Zhao,Yongguang Wang,Yan Hu,Linjie Xu,Longchao Yao,Chenghang Zheng,Jian Yang,Xiang Gao
出处
期刊:Nanotechnology
[IOP Publishing]
日期:2023-06-06
卷期号:34 (36): 365502-365502
被引量:7
标识
DOI:10.1088/1361-6528/acdbd3
摘要
Rapid detection of low concentration toluene is highly desirable in environment monitoring, industrial processes, medical diagnosis, etc. In this study, we prepared Pt-loaded SnO2monodispersed nanoparticles through hydrothermal method and assembled a sensor based on micro-electro-mechanical system (MEMS) to detect toluene. Compared with the pure SnO2, the 2.92 wt% Pt-loaded SnO2sensor exhibits a 2.75 times higher gas sensitivity to toluene at about 330 °C. Meanwhile, the 2.92 wt% Pt-loaded SnO2sensor also has a stable and good response to 100 ppb of toluene. Its theoretical detection limit is calculated as low as 12.6 ppb. Also, the sensor has a short response time of ∼10 s to different gas concentrations, as well as the excellent dynamic response-recovery characteristics, selectivity, and stability. The improved performance of Pt-loaded SnO2sensor can be explained by the increase of oxygen vacancies and chemisorbed oxygen species. The electronic and chemical sensitization of Pt to SnO2-based sensor, together with small size and fast gas diffusion of the MEMS design ensured fast response and ultra-low toluene detection. This provides new ideas and decent prospect for developing miniaturized, low-power-consumption, and portable application of gas sensing devices.
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