Influence of tetragonal and mixed-phase transitions in TiO2 on fast hydrogen gas sensing
Source abstract
Abstract
Metal oxide semiconductors are widely employed to enhance the performance of hydrogen sensors. In this work, a simple sol-gel method was used to synthesise TiO2 followed by heat treatment (400, 600, or 800 °C.) to obtain materials with predominantly tetragonal (anatase-rutile), mixed tetragonal-orthorhombic, and mixed tetragonal-tetragonal (anatase-rutile) crystal structures, respectively. The prepared samples were characterized by X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and UV-visible diffuse reflectance spectroscopy (UV-visible DRS). The results show that TiO2 annealed at 600 °C exhibits the best H2 sensing performance, ensuring a sensor response (Ra/Rg) of approximately 3.7 at 3000 ppm and fast response and recovery times of 3.5 and 11.9 s, respectively.
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Research context
OpenAlex topics: Gas Sensing Nanomaterials and Sensors · TiO2 Photocatalysis and Solar Cells · Analytical Chemistry and Sensors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (46)
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