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<p>Reduced graphene oxide (rGO), prepared via thermal reduction, was studied as a gas sensing material for detecting NO, NO<sub>2</sub>, ethanol, and NH<sub>3</sub>. Structural analysis using X-ray diffraction (XRD) and Raman spectroscopy revealed that rGO maintained a partially disordered layered structure with residual oxygen functionalities, indicated by a broadened (001) peak and a high D/G intensity ratio. X-ray photoelectron spectroscopy (XPS) confirmed selective removal of hydroxyl groups and enrichment of sp<sup>2</sup>-hybridized C = C bonds, highlighting surface chemical tuning. SEM imaging showed a wrinkled and loosely stacked morphology uniformly covering the electrode surface, contributing to a large surface area and stable interfacial contact. Gas sensing properties were assessed by monitoring resistance changes across various gas concentrations (2–10&#xa0;ppm). The rGO sensor demonstrated strong, gas-specific, and concentration-dependent responses: ~ 50% for NO at 10&#xa0;ppm, 27% for ethanol at 2&#xa0;ppm, 25% for NH<sub>3</sub> at 5&#xa0;ppm, and 17% for NO<sub>2</sub> at 10&#xa0;ppm. Time-resolved measurements revealed faster response and recovery for NO and NO<sub>2</sub> than for NH<sub>3</sub> and ethanol. These findings suggest that thermally reduced rGO, with its defect-rich structure, favorable morphology, and optimized surface chemistry, holds significant potential for use in selective and sensitive gas sensing applications.</p>

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Predominant hydroxyl group reduction for gas sensitivity control in graphene oxide

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月20日

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  • Hye Gyu Cha,
  • Sushanta K. Das,
  • Yunji Hwang,
  • Seong Chan Jun

摘要

Reduced graphene oxide (rGO), prepared via thermal reduction, was studied as a gas sensing material for detecting NO, NO2, ethanol, and NH3. Structural analysis using X-ray diffraction (XRD) and Raman spectroscopy revealed that rGO maintained a partially disordered layered structure with residual oxygen functionalities, indicated by a broadened (001) peak and a high D/G intensity ratio. X-ray photoelectron spectroscopy (XPS) confirmed selective removal of hydroxyl groups and enrichment of sp2-hybridized C = C bonds, highlighting surface chemical tuning. SEM imaging showed a wrinkled and loosely stacked morphology uniformly covering the electrode surface, contributing to a large surface area and stable interfacial contact. Gas sensing properties were assessed by monitoring resistance changes across various gas concentrations (2–10 ppm). The rGO sensor demonstrated strong, gas-specific, and concentration-dependent responses: ~ 50% for NO at 10 ppm, 27% for ethanol at 2 ppm, 25% for NH3 at 5 ppm, and 17% for NO2 at 10 ppm. Time-resolved measurements revealed faster response and recovery for NO and NO2 than for NH3 and ethanol. These findings suggest that thermally reduced rGO, with its defect-rich structure, favorable morphology, and optimized surface chemistry, holds significant potential for use in selective and sensitive gas sensing applications.