Abstract Reduced graphene oxide (rGO) has been successfully prepared by a facile method of thermal reduction of graphene oxide in the presence of inert gas environment. The combined characterizations which include Raman spectroscopy, Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) indicate the successful formation of thermally reduced rGO. The gas sensing application of the prepared samples is demonstrated by the changes in the chemiresistive properties. The rGO based sensor is operated at the room temperature for the detection of SO2 at low part per million (ppm) levels. It is found that rGO based chemiresistive sensors exhibit sensing response of 3.21% at the concentration level of SO2 as low as 5 ppm at room temperature. The sensing response increases with increase in ppm level of the analytes and it exhibits rapid response, good selectivity and reproducibility at room temperature. Furthermore, the increase in sensing response is attributed to increase in number of defects in the sensing layer as well increase in its macroporous structure.

中文翻译：

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基于热还原氧化石墨烯的化学电阻气体传感器，用于在室温下感测二氧化硫

摘要 通过在惰性气体环境中热还原氧化石墨烯的简便方法，已成功制备还原氧化石墨烯 (rGO)。包括拉曼光谱、傅里叶变换红外光谱 (FT-IR) 和扫描电子显微镜 (SEM) 的组合表征表明热还原 rGO 的成功形成。化学电阻性质的变化证明了所制备样品的气敏应用。基于 rGO 的传感器在室温下运行，用于检测低百万分之一 (ppm) 水平的 SO2。发现基于 rGO 的化学电阻传感器在室温下 SO2 浓度水平低至 5 ppm 时表现出 3.21% 的传感响应。传感响应随着分析物 ppm 水平的增加而增加，并且在室温下表现出快速响应、良好的选择性和重现性。此外，传感响应的增加归因于传感层中缺陷数量的增加以及其大孔结构的增加。