Abstract A room-temperature hydrogen gas (H2) sensor was successfully fabricated by dispersion of palladium nanoparticles (Pd NPs) on graphene sheets (GRs) (hereafter referred to as “Pd NPs/GRs”). GRs and Pd NPs were synthesized by chemical vapor deposition technique and by polyol process, respectively. A colloidal solution of Pd NPs with an average diameter of 11 nm was then dispersed onto the GRs by spin coating technique. The density of dispersed Pd NPs on GRs was controlled by varying the volume of the dispersed solution within the range of 50 – 150 μL. The fabricated Pd NPs/GRs sensors exhibited a high sensitivity for H2 gas with a concentration of 1500 – 6000 ppm at room temperature. Upon H2 exposure, the Pd NPs/GRs sensors showed an increase in electrical resistance, which could easily be measured. The relationship between sensor response and H2 concentration is in correspondence with the Langmuir adsorption model. The H2 detection limit is estimated to be 1 ppm. The results demonstrate that the Pd NPs/GRs sensor is an easily fabricated, but very effective means for room-temperature detection of H2at ppm level.

中文翻译：

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基于通过旋涂技术分散在石墨烯片上的钯纳米颗粒的有效氢气传感器

摘要 通过将钯纳米粒子 (Pd NPs) 分散在石墨烯片 (GRs)（以下简称“Pd NPs/GRs”）上，成功制备了室温氢气 (H2) 传感器。GRs 和 Pd NPs 分别通过化学气相沉积技术和多元醇工艺合成。然后通过旋涂技术将平均直径为 11 nm 的 Pd NPs 胶体溶液分散到 GRs 上。通过在 50 – 150 μL 范围内改变分散溶液的体积来控制 GR 上分散的 Pd NPs 的密度。制造的 Pd NPs/GRs 传感器在室温下对浓度为 1500-6000 ppm 的 H2 气体表现出高灵敏度。在 H2 暴露后，Pd NPs/GRs 传感器显示电阻增加，这很容易测量。传感器响应与 H2 浓度之间的关系与朗缪尔吸附模型一致。H2 检测限估计为 1 ppm。结果表明，Pd NPs/GRs 传感器是一种易于制造但非常有效的室温检测 H2at ppm 水平的方法。