文化大學機構典藏 CCUR:Item 987654321/2687
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    Please use this identifier to cite or link to this item: https://irlib.pccu.edu.tw/handle/987654321/2687


    Title: Humidity sensors based on TiO2 nanoparticles/polypyrrole composite thin films
    Authors: Su, Pi-Guey
    Huang, Lin-Nan
    Contributors: 化學系
    Keywords: humidity sensor
    in situ photopolymerization
    composite film
    PPy
    TiO(2)NPs
    sensing mechanism
    Date: 2007
    Issue Date: 2009-11-13 15:03:33 (UTC+8)
    Abstract: Resistive-type humidity sensors were fabricated through in situ photopolymerization of pure polypyrrole (PPy) and TiO2 nanoparticles/polypyrrole (TiO2 NPs/PPy) composite thin films on an alumina substrate. The characterizations of the thin films were analysed by scanning electron microscopy (SEM) coupled with an energy dispersive spectrometer (EDS) and Fourier transform infrared spectroscopy (FTIR). The electronic properties of PPy and TiO2 NPs/PPy composite thin films were investigated based on the components AgNO3 and TiO2 used as electron acceptor and photoinitiator, respectively. The humidity sensing mechanism of TiO2 NPs/PPy composite thin films was investigated via the results of activation energy and impedance spectroscopy. The sensor made of TiO2 NPs/PPy composite thin films, using the added amount of TiO2 NPs as 0.0012g showed the highest sensitivity, smaller hysteresis and best linearity. Moreover, other sensing properties, such as effects of applied frequency, ambient temperature, response and recovery time and long-term stability were also investigated. (c) 2006 Elsevier B.V. All rights reserved.
    Relation: AND ACTUATORS B-CHEMICAL Volume: 123 Issue: 1 Pages: 501-507
    Appears in Collections:[Department of Chemistry & Graduate Institute of Applied Chemistry ] journal articles

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