Please use this identifier to cite or link to this item: http://www.repositorio.ufop.br/handle/123456789/9409
Title: Effect of TiO2 nanoparticles on polyaniline films electropolymerized at different pH.
Authors: Leite Filho, Valfrido Furtado
Machado, Giovanna
Batista, Ronaldo Junio Campos
Soares, Jaqueline dos Santos
Oliveira, Alan Barros de
Vasconcelos, Cláudia Karina Barbosa de
Lino, Andre Alves
Manhabosco, Taíse Matte
Issue Date: 2016
Citation: LEITE FILHO, V. F. et al. Effect of TiO2 nanoparticles on polyaniline films electropolymerized at different pH. Journal of Physical Chemistry. C, v. 120, p. 14977-14983, 2016. Disponível em: <http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.6b04919>. Acesso em: 16 jan. 2018.
Abstract: In this work hybrids of titanium nanoparticles and polyaniline are obtained by pulsed electrodeposition at different pH (1.5, 3.9 and 5.9) and characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, cyclic voltammetry, ultraviolet−visible, and Raman spectroscopies. We found that films deposited at pH 5.9 with nanoparticles incorporation are composed of emeraldine meanwhile films without nanoparticles are composed of pernigraniline. As a result, films deposited with nanoparticles incorporation present conductivity 6 times higher than that of films deposited without nanoparticles. Films deposited at pH 3.9 with or without nanoparticles incorporation are both made of pernigraniline. Even though films with nanoparticles incorporation still present higher conductivity. To explain such a result, we performed first-principles calculations on polyaniline/ TiO2 interface. The calculations predict a metallic polyaniline/TiO2 interface in spite of polyaniline and TiO2 being semiconductors. At pH 1.5, the presence of nanoparticles has negligible effect on films characteristics. We believe that at low pH (pH 1.5) H atoms tend to bind TiO2 surface resulting in positively charged nanoparticles, which are further screened by SO4 −2 anions. Such a screening layer prevents the physical contact between nanoparticles and polyaniline monomers diminishing the effects of nanoparticle presence.
URI: http://www.repositorio.ufop.br/handle/123456789/9409
metadata.dc.identifier.uri2: http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.6b04919
ISSN: 19327447
Appears in Collections:DEFIS - Artigos publicados em periódicos

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