Highly Selective Ethyl Mercaptan Sensing Using a MoSe2/SnO2 Composite at Room Temperature

吸附 材料科学 相对湿度 化学吸附 复合数 选择性 氧化剂 分子 分析物 选择性吸附 化学工程 无机化学 分析化学(期刊) 物理化学 有机化学 化学 复合材料 催化作用 工程类 物理 热力学
作者
Sukhwinder Singh,Jyotirmoy Deb,Jatinder Singh,Utpal Sarkar,Sandeep Sharma
出处
期刊:ACS Applied Materials & Interfaces [American Chemical Society]
卷期号:14 (20): 23916-23927 被引量:23
标识
DOI:10.1021/acsami.1c25112
摘要

Volatile organic sulfur compounds (VOSCs) serve not only as biomarkers for dental diseases such as halitosis but also as a tracer for monitoring air quality. Room-temperature selective detection and superior sensitivity against VOSCs at a sub-ppm level has remained a challenging task. Here, we propose a heterostructure-based design using a MoSe2/SnO2 composite for achieving sensitive and selective detection of ethyl mercaptan at room temperature. The composite was synthesized via a facile two-step method. A composite-based device has shown detection down to 1 ppm of ethyl mercaptan over a wider range of relative humidity (40–90%). Notably, the composite has shown adsorption selectivity toward ethyl mercaptan compared to hydrogen sulfide and other reducing or oxidizing analytes. Moreover, a density functional theory (DFT) study has been performed to understand the adsorption selectivity, charge transfer, and modification in the electronic properties after molecule adsorption on the host surface. Simulations predicted the lowest negative adsorption energy for ethyl mercaptan, implying the chemisorption (−142.029 kJ mol–1) process of adsorption. The device thus-obtained has also shown a stable response even at an extreme relative humidity level of 90%. The obtained results and superior signal-to-noise ratio indicate that a MoSe2/SnO2-based sensor may be a promising candidate for highly selective and sensitive detection of ethyl mercaptan even below 1 ppm.
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