Effect of C6H14N2O7 and reaction temperature on sensing properties of hierarchical WO3 for H2S sensor.

In this study, WO3 nanoparticles with hierarchical structures are prepared by a simple hydrothermal method using diammonium hydrogen citrate (C6H14N2O7) as an additive, and the effects of reaction temperature and addition of C6H14N2O7 on their morphology are investigated in detail. The physical properties and morphology of the prepared WO3 materials are analyzed by scanning electron microscopy, X-ray diffraction , transmission electron microscopy, and Brunauer–Emmett–Teller method, and a possible growth mechanism is proposed. The results show that C6H14N2O7 is adsorbed on the edges of the nanosheets and inhibits their anisotropic growth. In addition, based on this material, sensors are self-assembled for detecting the decomposition products of SF6, and the gas-sensitive properties of the material are investigated. The experimental results show that the sensors based on WO3 with hierarchical structures are highly sensitive to H2S and exhibit a low operating temperature. This indicates that such sensors can be effectively used to detect the main decomposition products of SF6. [ABSTRACT FROM AUTHOR]