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Synthesis and characterization of a conducting polyaniline/TiO 2 −SiO 2 composites
Author(s) -
Liu Fuwei,
Liu Zhi,
Gu Yanhong,
Chen Zhe,
Fang Pengfei
Publication year - 2013
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.39425
Subject(s) - polyaniline , materials science , fourier transform infrared spectroscopy , scanning electron microscope , thermogravimetry , composite material , polymerization , transmission electron microscopy , conductivity , conductive polymer , high resolution transmission electron microscopy , chemical engineering , polymer , nanotechnology , chemistry , engineering
Polyaniline/TiO 2 −SiO 2 composites were prepared by an in situ chemical oxidation polymerization approach in the presence of hybrid TiO 2 −SiO 2 fillers. The obtained polyaniline/TiO 2 −SiO 2 composites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectrometer (FTIR), X‐ray diffraction (XRD), thermogravimetry (TG), and current−voltage (I−V) measurements. SEM picture shows a variation in morphology of polyaniline (PANI) from fiber shape to relatively regular particle shape with increasing TiO 2 −SiO 2 contents in the composites. The floccule‐like structures were observed by high resolution TEM, which may help improve the efficiency of conductive network. SEM, XRD, TG, and FTIR spectra all reveal that a relatively strong interaction exist between TiO 2 −SiO 2 and PANI. The I−V characteristics in such composites indicate that the charge transport is mainly governed by the space charge effects, which occurs at the interface between the conducting PANI and TiO 2 −SiO 2 . Meanwhile, PANI/TiO 2 −SiO 2 composites exhibit significant increase in conductivity than PANI/TiO 2 or PANI/SiO 2 . The reasons about high conductivity of PANI/TiO 2 −SiO 2 have also been discussed. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 2288–2295, 2013