title: Nanostructured films from phthalocyanine and carbon nanotubes: surface morphology and electrical characterization.
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.
authors: Grupo de Materiais Nanoestruturados, Universidade Federal de Mato Grosso, Barra do Garças, Mato Grosso, Brazil.
authors: Jackeline B
authors: JB
authors: Brito
authors: Douglas J C
authors: DJ
authors: Gomes
authors: Vanessa D
authors: VD
authors: Justina
authors: Aline M F
authors: AM
authors: Lima
authors: Clarissa A
authors: CA
authors: Olivati
authors: Josmary R
authors: JR
authors: Silva
authors: Nara C
authors: NC
authors: de Souza
mesh_terms: D048271:Chitosan / Q000737:chemistry; D004553:Electric Conductivity; D007211:Indoles / Q000737:chemistry*; D054833:Isoindoles; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D013499:Surface Properties
chemical_list: D007211:Indoles; D054833:Isoindoles; D037742:Nanotubes, Carbon; D048271:Chitosan; C013647:phthalocyanine