Nanostructured films from phthalocyanine and carbon nanotubes: surface morphology and electrical characterization |
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| Authors: | Brito Jackeline B Gomes Douglas J C Justina Vanessa D Lima Aline M F Olivati Clarissa A Silva Josmary R de Souza Nara C |
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| Institution: | 1. Grupo de Materiais Nanoestruturados, Universidade Federal de Mato Grosso, Barra do Garças, Mato Grosso, Brazil;2. Laboratório de Química Bio-Orgânica do Araguaia, Universidade Federal de Mato Grosso, Barra do Garças, Mato Grosso, Brazil;3. Faculdade de Ciências e Tecnologia, UNESP Universidade Estadual Paulista, Presidente Prudente/SP, Brazil |
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| Abstract: | 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. |
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