Fabrication of an ultra-sensitive humidity sensor based on polypyrrole flakes/β-AgVO3 nanowires nanocomposite films via in situ photopolymerization

IF 2.7 3区化学 Q2 CHEMISTRY, ANALYTICAL

Analytical Methods Pub Date : 2025-04-14 DOI:10.1039/D5AY00279F

Pi-Guey Su and Ya-Fang Lin

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Abstract

An ultra-sensitive impedance-type humidity sensor was developed through in situ UV-irradiation photopolymerization of a polypyrrole flakes (PPy Fs)/β-AgVO₃ nanowires (NWs) nanocomposite film on an alumina substrate. The composition, microstructure, and morphology of the PPy Fs/β-AgVO₃ NWs nanocomposite films were characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The influence of varying PPy Fs concentrations on the electrical properties and humidity-sensing performance of PPy Fs/β-AgVO₃ nanocomposite films was systematically investigated. A PPy Fs/β-AgVO₃ NWs nanocomposite film composed of 0.5 mL of PPy Fs and 0.1 g of β-AgVO₃ NWs exhibited a broad operating humidity range, exceptional sensitivity, satisfactory linearity, minimal hysteresis, rapid response/recovery time, and low temperature dependence. The humidity-sensing mechanism of the PPy Fs/β-AgVO₃ NWs nanocomposite film-based sensor was analyzed using complex impedance spectra.

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聚吡啶片/β-AgVO3纳米线纳米复合膜原位光聚合制备超灵敏湿度传感器。

通过在氧化铝基体上原位光聚合聚吡啶片(PPy Fs)/β-AgVO3纳米线（NWs）纳米复合膜，研制了一种超灵敏阻抗型湿度传感器。采用傅里叶变换红外光谱（FTIR）、x射线衍射（XRD）、扫描电镜（SEM）和透射电镜（TEM）对PPy Fs/β-AgVO3 NWs纳米复合膜的组成、微观结构和形貌进行了表征。系统研究了不同PPy Fs浓度对PPy Fs/β-AgVO3纳米复合薄膜电学性能和感湿性能的影响。由0.5 mL PPy Fs和0.1 g β-AgVO3 NWs组成的PPy Fs/β-AgVO3 NWs纳米复合膜具有工作湿度范围宽、灵敏度高、线性好、滞后小、响应/恢复时间快、温度依赖性低等特点。利用复阻抗谱分析了PPy Fs/β-AgVO3 NWs纳米复合薄膜传感器的湿度传感机理。

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