非阻塞I/O
湿度
氧化镍
材料科学
氧化物
镍
旋涂
相对湿度
挥发性有机化合物
金属
涂层
分析化学(期刊)
冶金
化学
环境化学
纳米技术
气象学
有机化学
催化作用
物理
作者
Sai Kiran Ayyala,James A. Covington
出处
期刊:Chemosensors
[Multidisciplinary Digital Publishing Institute]
日期:2021-09-03
卷期号:9 (9): 247-247
被引量:28
标识
DOI:10.3390/chemosensors9090247
摘要
In this paper, we report on the development of a highly sensitive and humidity-tolerant metal-oxide-based volatile organic compound (VOC) sensor, capable of rapidly detecting low concentrations of VOCs. For this, we successfully fabricated two different thicknesses of nickel oxide (NiO) sensors using a spin-coating technique and tested them with seven different common VOCs at 40% r.h. The measured film thickness of the spin-coated NiO was ~5 μm (S-5) and ~10 μm (S-10). The fastest response and recovery times for all VOCs were less than 80 s and 120 s, respectively. The highest response (Rg/Ra = 1.5 for 5 ppm ethanol) was observed at 350 °C for both sensors. Sensors were also tested in two different humidity conditions (40% and 90% r.h.). The humidity did not significantly influence the observed sensitivity of the films. Furthermore, S-10 NiO showed only a 3% drift in the baseline resistance between the two humidity conditions, making our sensor humidity-tolerant compared to traditional n-type sensors. Thus, we propose thick-film NiO (10 μm) sensing material as an interesting alternative VOC sensor that is fast and humidity-tolerant.
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