Abstract In present work, the hydrogen gas sensing behaviour of graphene modified with rubidium (Rb-G) based sensor is reported. The Rb-G powders with 0.5, 1.0, 1.5, 2.0, 2.5 and 3.0 M M concentrations of Rb are synthesized by using wet-chemical route. The as-synthesized Rb-G powders are characterized by using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), UV–visible spectroscopy and photoluminescence spectroscopy. The XRD studies revealed the crystallization of Rb-graphene composite in as-synthesized Rb-G powders. The morphological analysis showed formation tightly packed sheets leading to spherical granules with increasing molar concentration of Rb in resultant Rb-G powders. The UV–visible and photoluminescence spectroscopic studies of as-synthesized Rb-G powders confirmed the addition of Rb within graphene sheets due to restoration of electronic conjugation leading to red shift. The gas sensing studies indicated the remarkable percentage sensitivity of 482 at considerably lower operating temperature of 348 K for the pellet sensor fabricated by using Rb-G powders obtained at 0.3 M concentrations of Rb. The gas sensing characterization proved the considerable repeatability and stability of this sensor with excellent selectivity towards hydrogen gas.

中文翻译：

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铷 (Rb) 改性石墨烯的增强氢气传感特性

摘要 在目前的工作中，报道了铷 (Rb-G) 基传感器改性石墨烯的氢气传感行为。采用湿化学法合成了Rb浓度为0.5、1.0、1.5、2.0、2.5和3.0 M M的Rb-G粉末。通过使用 X 射线衍射 (XRD)、场发射扫描电子显微镜 (FESEM)、紫外-可见光谱和光致发光光谱对合成的 Rb-G 粉末进行表征。XRD 研究揭示了 Rb-石墨烯复合材料在合成的 Rb-G 粉末中的结晶。形态分析表明，随着所得 Rb-G 粉末中 Rb 摩尔浓度的增加，形成紧密堆积的薄片导致球形颗粒。合成的 Rb-G 粉末的紫外可见光和光致发光光谱研究证实了由于电子共轭的恢复导致红移，在石墨烯片中添加了 Rb。气敏研究表明，对于使用在 0.3 M 浓度 Rb 下获得的 Rb-G 粉末制造的颗粒传感器，在 348 K 的相当低的工作温度下，482 的显着百分比灵敏度。气敏特性证明该传感器具有相当大的可重复性和稳定性，对氢气具有出色的选择性。3 M 浓度的 Rb。气敏特性证明该传感器具有相当大的可重复性和稳定性，对氢气具有出色的选择性。3 M 浓度的 Rb。气敏特性证明该传感器具有相当大的可重复性和稳定性，对氢气具有出色的选择性。