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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.
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Keywords:
- Co3(HITP)2 /
- rGO /
- H2S detection /
- Room-temperature
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