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首页> 外文期刊>RSC Advances >Molybdenum trioxide nanopaper as a dual gas sensor for detecting trimethylamine and hydrogen sulfide
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Molybdenum trioxide nanopaper as a dual gas sensor for detecting trimethylamine and hydrogen sulfide

机译：三氧化钼纳米纸作为双气体传感器，用于检测三甲胺和硫化氢

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A free-standing, flexible, and semi-transparent MoO3 nanopaper was fabricated using ultralong MoO3 nanobelts (length ～ 200 μm; width 200–400 nm), and its gas-sensing characteristics were investigated. The sensor exhibited high responses (resistance ratio) of 49 to 5 parts per million (ppm) hydrogen sulfide (H2S) at 250 °C and 121 to 5 ppm trimethylamine (TMA) at 325 °C with excellent gas selectivity, demonstrating its dual function for gas detection. Moreover, the sensor showed promising potential for the all-in-one detection of three representative offensive odors (TMA, H2S, and NH3) simply by tuning of the sensing temperature. This particular performance is attributed to the high chemical affinity of MoO3 to H2S and the acid–base interaction between basic TMA/NH3 and acidic MoO3. The mechanism underlying the control of gas selectivity by modulating the sensor temperature was investigated by Diffuse Reflectance Infrared Fourier Transform (DRIFT) measurements.
机译：使用超长MoO 3 纳米带制备了独立，灵活且半透明的MoO 3 纳米纸（研究了长〜200μm;宽200-400 nm）及其气敏特性。该传感器在250°C和121至5 ppm三甲胺下表现出49至5百万分之一（ppm）硫化氢（H 2 S）的高响应（电阻比） （TMA）在325°C的温度下具有出色的气体选择性，证明了其双重功能，可进行气体检测。此外，该传感器还显示出有希望的潜力，可以对三种代表性的令人讨厌的气味（TMA，H 2 S和NH 3 ），只需调整感测温度即可。这种特殊的性能归因于MoO 3 对H 2 S和酸碱的高化学亲和力TMA / NH 3 与酸性MoO 3 之间的相互作用通过漫反射红外傅里叶变换（DRIFT）测量研究了通过调节传感器温度来控制气体选择性的基本机理。

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