Facile Surface Engineering of TiO2 Nanosheets for Enhanced Isopropanol Sensing under UV Irradiation

文献类型： 外文期刊

第一作者： Wu, Zeyi

作者： Wu, Zeyi;Su, Mengyao;Song, Xiangyu;Li, Xinyuan;Liu, Jiajia;Zhang, Jiatao;Wu, Zeyi;Su, Mengyao;Song, Xiangyu;Li, Xinyuan;Liu, Jiajia;Zhang, Jiatao;Li, Denghua

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关键词： TiO2 nanosheets; surface engineering; photoactivated; fluoride; isopropanol sensing

期刊名称：ACS APPLIED ELECTRONIC MATERIALS （ 影响因子：4.7； 五年影响因子：4.7 ）

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年卷期： 2024 年

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收录情况： SCI

摘要： Surface termination and defects of metal oxide semiconductors are crucial in the process of gas adsorption-desorption and signal transduction, thereby determining their sensing performance. Herein, a facile solvent-assisted surface engineering strategy was demonstrated to synthesize anatase TiO2 nanosheets (TNS) for an ultraviolet (UV) light-activated isopropanol (IPA) gas sensor. Surface-fluorinated TiO2 nanosheets (F-TNS) were first synthesized by the hydrofluoric acid-assisted hydrothermal method and followed by hydrothermally treating in Na2S solutions with different concentrations. The effect of the progressive removal of fluorides was discussed in detail based on X-ray photoelectron spectroscopy (XPS), diffuse reflectance spectroscopy (DRS), electrochemical impedance spectroscopy (EIS), and in situ Fourier transform infrared (FTIR) spectroscopy analyses. Compared with F-TNS, the chemiresistive sensor based on the TNS with a trace amount of fluorine exhibited a 324% increase in the sensitivity to 50 ppm of isopropanol at 50 degrees C under UV irradiation (lambda = 365 nm, 30 mW/cm(2)), while it exhibited a 45% decrease in the recovery time. The enhanced isopropanol sensing performance could be attributed to the high surface area, rational surface terminations, oxygen vacancies, and UV photoexcited charge carriers, which further modulate the surface reaction and charge transfer. These findings offer a facile strategy for the rational design of oxide-based sensing materials, which help in understanding the function of surface terminations and defects in gas sensing.

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