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Polymer Bulletin

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27-08-2015 | Original Paper

Preparation of poly(o-toluidine)/TiO₂ nanocomposite films and application for humidity sensing

Authors: Tieli Zhou, Xiuhong Xie, Jianyan Cai, Liying Yin, Weidong Ruan

Published in: Polymer Bulletin | Issue 3/2016

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Abstract

Conducting poly(o-toluidine) (POT)/titanium dioxide (TiO₂) nanocomposite films have been synthesized by in situ chemical oxidation polymerization of o-toluidine in the presence of TiO₂ nanoparticles. The nanocomposite films were characterized by Fourier transform infrared (FT–IR) spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The characterization results confirmed the polymerization of o-toluidine and the strong interaction between POT and TiO₂ nanoparticles. The humidity-sensing property of the films was tested by measuring the direct current electric resistance at two relative humidity (RH) values, 11 and 97 %, respectively. The POT/TiO₂ nanocomposite films exhibited quick response and recovery times, which were about 38 and 6 s, respectively. Both the response and recovery time are faster than those of pure POT films. The results indicate that the POT/TiO₂ nanocomposite films have better sensing property than pure POT films. The increasing humidity sensitivity of the POT/TiO₂ nanocomposite films attributes to the synergic adsorption of the water molecules from both POT and TiO₂, and the high surface areas of nanocomposite films.

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Title: Preparation of poly(o-toluidine)/TiO2 nanocomposite films and application for humidity sensing
Authors: Tieli Zhou
Xiuhong Xie
Jianyan Cai
Liying Yin
Weidong Ruan
Publication date: 27-08-2015
Publisher: Springer Berlin Heidelberg
Published in: Polymer Bulletin / Issue 3/2016
Print ISSN: 0170-0839
Electronic ISSN: 1436-2449
DOI: https://doi.org/10.1007/s00289-015-1509-y

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