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1587747 
Journal Article 
Synthesis and characterization of polypyrrole/Sn-doped TiO2 nanocomposites (NCs) as a protective pigment 
Mahmoudian, MR; Basirun, WJ; Alias, Y; Ebadi, M 
2011 
Yes 
Applied Surface Science
ISSN: 0169-4332 
257 
20 
8317-8325 
WOS:000291725100004 
We have chemically polymerized pyrrole in the presence of
Sn-doped TiO2 nanoparticles (NPs) and TiO2 (NPs) which act as a protective pigment. Field
emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) results
show a core-shell structure of pigments in which TiO2 and Sn-doped TiO2 NPs have a nucleus effect
and caused a homogenous PPy core-shell type morphology leading to coverage of the TiO2 and Sn-
doped TiO2 NPs by PPy deposit. The XRD results indicate that the crystalline size of
polypyrrole/TiO2 NCs and polypyrrole/Sn-doped TiO2 NCs were approximately 93.46 +/- 0.06 and
23.36 +/- 0.06 nm respectively. The electrochemical impedance spectroscopy (EIS) results show
that the performance of polypyrrole/Sn-doped TiO2 NCs is better than polypyrrole/TiO2 NCs. The
results indicate that increasing the area of synthesized polypyrrole in the presence of Sn-doped
TiO2 NPs can increase its ability to interact with the ions liberated during the corrosion
reaction of steel in the presence of NaCl. The UV-vis results show that the band gap of TiO2 NPs
increases with doped of Sn in lattice of TiO2. The increase of the band gap of TiO2 with doping
of Sn can decrease the charge transfer through the coating. (C) 2011 Elsevier B. V. All rights
reserved. 
Titanium dioxide; Nanocomposite; Polypyrrole; Corrosion; Coating