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通过溶剂热法合成了棒状Co3(HITP)2微结构，在合成过程中添加还原氧化石墨烯（rGO），制备出不同含量的rGO/Co3(HITP)2复合材料，通过扫描电子显微镜（SEM）、X射线衍射仪（XRD）、X射线光电子能谱（XPS）和气敏特性分析系统研究了rGO对Co3(HITP)2形貌、结构和室温气敏性能的影响。结果表明：rGO的加入会影响Co3(HITP)2棒状结构的形成，且rGO10/Co3(HITP)2传感器具有最优气敏特性，在室温（~25℃）25%相对湿度（RH）下对于体积分数为2×10-5 H2S的响应值为4.3，检测下限为5×10-8（体积分数）。此外，rGO10/Co3(HITP)2传感器还具有良好的选择性、抗干扰性以及快速响应/恢复特性（92 s/256 s），能带分析表明rGO和Co3(HITP)2之间的协同作用是复合结构气敏特性增强的主要原因，本工作在H2S气体室温高效检测方面具有重要的指导作用。
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关键词:
- Co3(HITP)2 /
- rGO /
- H2S检测 /
- 室温
Rod-like Co3(HITP)2 microstructures were synthesized via a solvothermal method. By introducing reduced graphene oxide (rGO) during the synthesis, rGO/Co3(HITP)2 composites with different rGO contents (1 g/L, 1, 10 and 100μL) were prepared. The influence of rGO on the morphology, structure, and room-temperature gas-sensing properties of Co3(HITP)2 was systematically investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and gas-sensing analysis. Results indicate that the addition of rGO affects the formation of the rod-like Co3(HITP)2 structure, causing slight changes in the structural and morphology. Furthermore, the amount of rGO also impact the sensing property. Among all sensors, rGO10/Co3(HITP)2 sensor demonstrated optimal gas-sensing performance, exhibiting a response value of 4.3 to 2×10-5 (volume fraction) H2S at room temperature (~25℃) and 25% relative humidity (RH), with a detection limit of 5×10-8 (volume fraction). Furthermore, the rGO10/Co3(HITP)2 sensor showed excellent selectivity, strong anti-interference ability, and fast response/recovery characteristics (92 s/256 s). Band structure analysis revealed that the synergistic effect between rGO and Co3(HITP)2 is the main reason for the enhanced gas-sensing properties of the composite. Despite its significant sensitivity to humidity, the rGO10/Co3(HITP)2 sensor demonstrates superior performance at room-temperature compared to higher temperatures. This work provides important guidance for the efficient room-temperature detection of H2S gas.-
Keywords:
- Co3(HITP)2 /
- rGO /
- H2S detection /
- Room-temperature
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