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Synthesis and characterization of polyaniline/silica doped with camphorsulfonic acid and dodecylbenzylsulfonic acid
Author(s) -
Lee HsunTsing,
Yang ShungJim
Publication year - 2009
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.31624
Subject(s) - polyaniline , dopant , materials science , polymer chemistry , conductive polymer , doping , chemical engineering , polymer , composite material , polymerization , optoelectronics , engineering
In this study, the effect of the dopant structure on the morphology, structure, optical absorption, conductivity, and thermal properties of conductive polyaniline (PAn)/silica (SiO 2 ) hybrids from a sol–gel process was first investigated. Camphorsulfonic acid (CSA) and dodecylbenzylsulfonic acid (DBSA) were used as the model acid dopants. The polaron absorption peaks of the CSA‐doped PAn/SiO 2 (CSA–PAn/SiO 2 ) hybrids were redshifted compared with those of the DBSA–PAn/SiO 2 hybrids. This indicated that the doped PAn subchains of the CSA–PAn/SiO 2 hybrids had a more rigid conformation and longer conjugation length than those of DBSA–PAn/SiO 2 hybrids. Therefore, the CSA–PAn/SiO 2 hybrids were more conductive than the DBSA–PAn/SiO 2 hybrids with same SiO 2 contents. Moreover, the CSA–PAn/SiO 2 hybrids exhibited higher SiO 2 condensation degrees and thermal resistance than the DBSA–PAn/SiO 2 hybrids with same SiO 2 contents. In addition, the CSA–PAn/SiO 2 films exhibited a nonuniform globular morphology, whereas the DBSA–PAn/SiO 2 films showed an interconnected and rugged fibrillar one. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010