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首页> 外文期刊>RSC Advances >Characterization of a hybrid composite of SnO2 nanocrystal-decorated reduced graphene oxide for ppm-level ethanol gas sensing application
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Characterization of a hybrid composite of SnO2 nanocrystal-decorated reduced graphene oxide for ppm-level ethanol gas sensing application

机译：SnO2纳米晶修饰的还原氧化石墨烯杂化复合材料在ppm级乙醇气体传感应用中的表征

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摘要

This paper demonstrated a hybrid composite of tin oxide-reduced graphene oxide (rGO) for ppm-level detection of ethanol vapour. A facile and low-cost method of hydrothermal synthesis was used to construct the SnO2-rGO hybrid film on a PCB substrate with coil-like interdigital microelectrodes. The presence of small-sized SnO2 nanocrystals on rGO sheets was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), an X-ray diffractometer (XRD) and Brunauer-Emmett-Teller (BET) measurements. The sensing properties of the SnO2-rGO hybrid film sensor, including the sensitivity, response-recovery times and repeatability, were investigated by exposing it to various concentrations of ethanol gas varying from 1 ppm to 100 ppm at room temperature. As a result, the presented sensor exhibited a low detection limit of 1 ppm at room temperature, as well as a fast response-recovery time and good repeatability, which outstripped that of pure rGO film sensors. Finally, the possible mechanism of ethanol gas-sensing for the above presented sensor was discussed in detail.
机译：本文展示了一种氧化锡还原的氧化石墨烯（rGO）的混合复合材料，可用于ppm级检测乙醇蒸气。使用一种简便而低成本的水热合成方法，在具有线圈状叉指微电极的PCB基板上构造SnO2-rGO杂化膜。通过扫描电子显微镜（SEM），透射电子显微镜（TEM），X射线衍射仪（XRD）和Brunauer-Emmett-Teller（BET）测量来表征rGO片上存在小尺寸的SnO2纳米晶体。通过在室温下将SnO2-rGO混合膜传感器暴露于浓度范围为1 ppm至100 ppm的各种乙醇气体中，研究了其灵敏度，响应恢复时间和可重复性等传感特性。结果，所提出的传感器在室温下的检测限低至1 ppm，并且响应恢复时间快且重复性好，这超出了纯rGO薄膜传感器的检测限。最后，详细讨论了上述传感器的乙醇气体传感的可能机理。

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