R. M. Faria

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The control of morphology and coating of metal surfaces is essential for a number of organic electronic devices including photovoltaic cells and sensors. In this study, we monitor the functionalization of gold surfaces with 11-mercaptoundecanoic acid (MUA, HS(CH(2) )(10) CO(2) H) and cysteamine, aiming at passivating the surfaces for application in surface(More)
The dynamic scale theory and fractal concepts are employed in the characterization of surface morphological properties of layer-by-layer (LBL) films from poly(o-methoxyaniline) (POMA) alternated with poly(vinyl sulfonic acid) (PVS). The fractal dimensions are found to depend on the procedures to fabricate the POMA/PVS multilayers, particularly with regard(More)
Self-organized block copolymer structures derived from dewetting of thin films are becoming important in nanotechnology because of the various spontaneous and regular sub-micrometric surface patterns that may be obtained. Here, we report on the self-organization of a poly(styrene)-b-poly(ethene-co-butene-1)-b-poly(styrene) triblock copolymer during drying(More)
Surface Morphology and Optical Characterization of OC1 OC6-PPV Films A. Marletta1∗, C. A. Olivati2, M. Ferreira2, M. L. Vega3, D. T. Balogh3, R. M. Faria3, and O. N. Oliveira Jr.3 1Instituto de Fı́sica, Universidade Federal de Uberlândia, Caixa Postal 593, 38400-902, Uberlândia, MG, Brazil 2Faculdade de Ciências e Tecnologia, Universidade Estadual Paulista,(More)
This work presents the application of advanced analysis processes and datamining to images produced by scanning probe microscopy in polymers samplers. These techniques are applied to two specific problems: statistical characterization of polydispersivity in films of poly (o-methoxyaniline) (POMA) and morphological analysis of substrates of polymers used to(More)
Synthesis of a polyfluorene/poly(p-phenylene vinylene) derivative, the Poly [(9,90-di-hexylfluorenediylvinylene-alt-1,4-phenylenevinylene)-co-((9,90-(3-t-butylpropanoate) fluorene-1,4-phenylene)] (LaPPS 42) was performed following Wittig and Suzuki routes. Polyfluorenes and derivatives have been used in electroluminescent devices, and the synthesis(More)
A statistical model of resistor network is proposed to describe a polymer structure and to simulate the real and imaginary components of its ac resistivity. It takes into account the polydispersiveness of the material as well as intrachain and interchain charge transport processes. By the application of a transfer matrix technique, it reproduces ac(More)
The in uence of electron-phonon coupling in the emission spectra of self-assembly (SA) lms of poly(p-phenylene vinylene) (PPV) is discussed. PPV is an important polymeric system because it exhibits strong luminescence e ect. A semi-empirical model was used to analyze the photoluminescence spectra of PPV. This model assumes that defects along the molecule(More)
Surface topology investigation of luminescent polymeric films is a promising research area due to the interest in their technological application, mainly to large-area electroluminescent displays (Holzera et al., 1999). Surface topology of organic flexible materials is generally controlled by a chemical and physical process, the polymer coatings are(More)