Journal
CERAMICS INTERNATIONAL
Volume 41, Issue 5, Pages 6432-6438Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2015.01.081
Keywords
Nanocomposite; TiO2 nanoparticles; Polypyrrole-graphene; NH3 sensor
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Funding
- National Natural Science Foundation of China [51461011, 51201041, 51201042, 51461010, 51401059, 51361005, 51371060]
- Natural Science Foundation of Guangxi Province [2013GXNSFCA019006, 2013GXNSFBA019243, 2014GXNSFAA118318, 2012GXNSFGA060002]
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A composite of polypyrrole (PPy) and graphene nanoplatelets (GNs) decorated with titanium dioxide (TiO2) nanoparticles (TiO2@PPy-GN) was synthesized by a sol-gel process combined with in situ chemical polymerization. The microstructure, morphology, and crystallinity of the TiO2@PPy-GN nanocomposite were characterized by Fourier-transform infrared spectrometry, scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. The results indicate that the TiO2 nanoparticles with a diameter of 10-30 nm were well dispersed on the PPy-GN composite. The TiO2@PPy-GN nanocomposite exhibited good electrical-resistance response to NH3 at room temperature. Compared to the PPy-GN thin film, the TiO2@PPy-GN thin film showed enhanced NH3-sensing properties in the form of higher sensitivity and much faster response under the same conditions. The selectivity and stability of the NH3 sensor based on the TiO2@PPy-GN nanocomposite were also investigated. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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