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Poly(3-hexythiophene)/multi-walled carbon nanotube composites: electrochemical and optical characterization

Published online by Cambridge University Press:  01 February 2011

Hállen D. R. Calado ,
Marcelo Valadares ,
Anthony W. Musumeci ,
Eric R. Waclawik ,
Luiz A. Cury  and
Glaura Goulart Silva
Hállen D. R. Calado
Affiliation:
hallendaniel@yahoo.com.br, UFMG, Quimica, Belo Horizonte, MG, Brazil
Marcelo Valadares
Affiliation:
mvaladares@fisica.ufmg.br, UFMG, Fisica, Belo Horizonte, MG, Brazil
Anthony W. Musumeci
Affiliation:
a-musumeci@hotmail.com, QUT, SCPS, Brisbane, Queensland, Australia
Eric R. Waclawik
Affiliation:
e.waclawik@qut.edu.au, QUT, SCPS, Brisbane, Queensland, Australia
Luiz A. Cury
Affiliation:
cury@fisica.ufmg.br, UFMG, Fisica, Belo Horizonte, MG, Brazil
Glaura Goulart Silva
Affiliation:
cury@fisica.ufmg.br, UFMG, Fisica, Belo Horizonte, MG, Brazil
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Abstract

Carbon nanotubes (CNT) / conjugated polymer composites have been used for the preparation of thin film-modified electrodes. Thin, short, multi-walled CNT (MWNT) (purity higher than 95%) was completely coated by regioregular poly(3-hexylthiophene) (P3HT) through precipitation of a mixture of both in the non-solvent methanol. This work reports the electrochemical and optical characterization of P3HT and composites after dissolution in xylene and spin casting of films with thickness <1 micrometer. Cyclic voltammetry showed that all samples were characterized by a semi-reversible behavior. The samples with 0% and 2% of MWNT, for instance, present anodic peak potential at +0.67 and +0.68V respectively when cycling at 100 mV/s. Optical properties, such as optical absorption and photoluminescence (PL), have been investigated. The samples showed maximum of absorption at ˜530 nm and intense PL in the orange. PL spectra of nanocomposites exhibited a new band at lower energy characteristic of a structure with higher conjugation length when compared to P3HT.

Keywords

compositephotoemissionpolymer
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1143: Symposium KK – Transport Properties in Polymer Nanocomposites , 2008 , 1143-KK01-02
Copyright
Copyright © Materials Research Society 2009

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