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Low-temperature H2S gas sensor based on spherical Ag3PO4-doped SnO2

An efficient method for detecting H2S gas at low temperatures using micrometer-sized spherical Ag3PO4-doped SnO2 materials synthesized by hydrothermal and chemical precipitation methods is reported. The crystalline phase, defects, elemental composition, and morphology of the samples were characterized in detail using scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The characterization results verified the spherical structures of Ag3PO4-doped SnO2 materials. The performance analysis revealed that the proposed gas sensor has the advantages of low operating temperature (100 °C), high response value (118), and good selectivity. The excellent H2S gas sensing performance is attributed to the increased oxygen vacancy defects and facile electron transfer process in the conduction band. Overall, this study validates the potential of gas-sensitive sensors based on Ag3PO4-doped SnO2 materials for practical applications.