纳米棒
氮氧化物
吸附
傅里叶变换红外光谱
分析化学(期刊)
电化学气体传感器
材料科学
化学工程
化学
电化学
电极
纳米技术
色谱法
有机化学
物理化学
工程类
燃烧
作者
Bo Zhang,Jiyu Sun,Pu‐Xian Gao
出处
期刊:ACS Sensors
[American Chemical Society]
日期:2021-07-18
卷期号:6 (8): 2979-2987
被引量:19
标识
DOI:10.1021/acssensors.1c00834
摘要
Quantitative measurement of the nitrogen oxide mixture (NOx, usually of NO and NO2) usually relies on sophisticated, space-consuming, and expensive spectroscopy techniques such as gas chromatography (GC), Fourier-transform infrared spectroscopy (FTIR), and chemi-luminescence detection (CLD). The direct and portable measurement solutions are lacking in this regard. In this work, by utilizing the bimodular sensing strategy, we successfully demonstrated the differential measurement of NOx with errors smaller than 8.3%, by correlating the sensor electrical and electrochemical responses. The effective detection is successfully displayed in the low-concentration ranges of 1–10 ppm for NO and 100 ppb–1 ppm for NO2, where weak competitive gas co-adsorption mitigated the cross-sensitivities compared to the higher-concentration range. Based on the electron occupation with negligible competitive adsorption, the accurate theoretic prediction of the mixture responses versus component concentration relieves the reliance on repeated calibration and empirical functions. With the miniaturized size and simplified electrical feedthrough, the single bimodular nanorod sensor provides a promising solution for direct and portable NOx analysis at low concentrations.
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