检出限
非阻塞I/O
甲苯
纳米结构
选择性
材料科学
吸附
热液循环
相对湿度
化学工程
线性范围
分析化学(期刊)
纳米技术
化学
色谱法
催化作用
有机化学
物理
工程类
热力学
作者
Hongyu Gao,Lin Zhao,Liwei Wang,Peng Sun,Huiying Lü,Fengmin Liu,Xiaohong Chuai,Geyu Lu
标识
DOI:10.1016/j.snb.2017.09.184
摘要
In this work, an ultrasensitive and low detection limit of toluene gas sensor based on SnO2-decorated NiO nanostructure synthesized via a simple hydrothermal route was described. The test results demonstrated that the sensor based on SnO2-decorated NiO nanostructure showed excellent sensitivity and selectivity toward toluene, giving a high response of 66.2–100 ppm, which was 50 times higher than that of the pure NiO nanospheres (1.3–100 ppm). Additionally, the sensor had surpassingly low detection limit (ppb-level), showing a response of 1.2–10 ppb toluene. Besides, the sensor also exhibited anti-humidity properties in some way, giving an acceptable response (11.1–10 ppm) to toluene at 90% relative humidity. The ultrasensitive characteristics and low detection limit could be explained from the variation of the carrier concentration caused by the change of the thickness of near-surface hole accumulation layer between p-type NiO and n-type SnO2. Furthermore, the increase of oxygen adsorption also improved the sensing performance.
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