Nanostructured films from phthalocyanine and carbon nanotubes: Surface morphology and electrical characterization
Nenhuma Miniatura disponível
Data
2012-02-01
Autores
Brito, Jackeline B.
Gomes, Douglas J. C.
Justina, Vanessa D.
Lima, Aline M. F.
Olivati, Clarissa A. [UNESP]
Silva, Josmary R.
de Souza, Nara C.
Título da Revista
ISSN da Revista
Título de Volume
Editor
Academic Press Inc. Elsevier B.V.
Resumo
We report on the investigation of the surface morphology and DC conductivity of nanostructured layer-by-layer (LbL) films from nickel tetrasulfonated phthalocyanine (NiTsPc) alternated with either multi-walled carbon nanotubes (MWNTs/NiTsPc) or multi-walled carbon nanotubes dispersed in chitosan (MWNTs + Ch/NiTsPc). We have explored the surface morphology of the films by using fractal concepts and dynamic scale laws. The MWNTs/NiTsPc LbL films were found to have a fractal dimension of ca. 2, indicating a quasi Euclidean surface. MWNTs + Ch/NiTsPc LbL films are described by the Lai-Das Sarma-Villain (LDV) model, which predicts the deposition of particles and their subsequent relaxation. An increase in the wetting contact angle of MWNTs + Ch/NiTsPc LbL films was observed, as compared with MWNTs/NiTsPc LbL films, which presented an increase in the fractal dimension of the first system. Room temperature conductivities were found be ca. 0.45 S/cm for MWNTs/NiTsPc and 1.35 S/cm for MWNTs + Ch/NiTsPc. (C) 2011 Elsevier B.V. All rights reserved.
Descrição
Palavras-chave
Multi-walled carbon nanotubes, Nickel tetrasulfonated phthalocyanine, Layer-by-layer (LbL) self-assembly films, Wetting contact angle, DC electrical conductivity, LDV model
Como citar
Journal of Colloid and Interface Science. San Diego: Academic Press Inc. Elsevier B.V., v. 367, p. 467-471, 2012.