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Time resolved emission spectroscopy of poly(2,5-dicyano-p-phenylene-vinylene) f...
Garcia,Jarem R.; Gehlen,Marcelo H.; Oliveira,Hueder P. M. de; Nart,Francisco C.Films of poly (2,5-dicyano-p-phenylene vinylene), DCNPPV, were obtained by electrochemical synthesis over gold thin layer (20 nm) transparent electrode deposited on a glass plate. The DCNPPV films of 4 µm thickness were produced by electropolymerization process of α,α,α',α'-tetrabromo-2-5-dicyano-p-xilene at different applied potentials (-0.15, -0.25, -0.40, -0.60, -0.80, and -1.0 V) using 0...
Oxygen reduction and diffusion in electroactive nanostructured membranes (ENM) ...
Crespilho, Frank N.; Nart, Francisco C.; Oliveira Jr., Osvaldo N.; Brett, Christopher M. A.The fabrication of an electroactive nanostructured membrane (ENM) for oxygen reduction, made of layer-by-layer (LbL) films comprising Au nanoparticle-containing amine-terminated G4 PAMAM dendrimer alternated with poly(vinylsulfonic acid) (PVS) layers is reported. Electrochemical impedance spectroscopy and cyclic voltammetry show that electrodes with PVS/PAMAM-Au multiple bilayers are efficient for oxygen reduct...
Electroactive Nanostructured Membranes (ENM): Synthesis and Electrochemical Pro...
Crespilho, Frank N.; Ghica, M. Emilia; Zucolotto, Valtencir; Nart, Francisco C.; Oliveira Jr., Osvaldo N.; Brett, Christopher M. A.The layer-by-layer (LbL) self-assembly process has become an important tool in the fabrication of nanostructured devices for electrochemical applications, especially in those cases where control at the molecular level is required. In this paper we present a system based on electroactive nanostructured membranes (ENM) with ITO-PVS/PAMAM-Au LbL electrodes, in which a redox mediator (Me) is electrodeposited around...
Enhanced Charge Transport and Incorporation of Redox Mediators in Layer-by-Laye...
Crespilho, Frank N.; Zucolotto, Valtencir; Brett, Christopher M. A.; Oliveira, Osvaldo N.; Nart, Francisco C.In this work, we exploit the molecular engineering capability of the layer-by-layer (LbL) method to immobilize layers of gold nanoparticles on indium tin oxide (ITO) substrates, which exhibit enhanced charge transfer and may incorporate mediating redox substances. Polyamidoamine (PAMAM generation 4) dendrimers were used as template/stabilizers for Au nanoparticle growth, with PAMAM-Au nanoparticles serving as c...
In Situ Scanning Tunneling Microscopy Study of 5,6-Dimethyl Uracil on Au (111)
Cunha,Frederico G. C.; Nart,Francisco C.The hydrogen evolution mediated 5,6-dimethyluracil (5,6-DMU) film disordering and subsequent reordering was studied in situ in sulfuric acid solution on Au (111) using STM and cyclic voltammetry. A stable, condensed physisorbed film was formed between the limits of the hydrogen evolution (at -0.3 V/SCE) and the lifting of the surface reconstruction (at 0.4 V/SCE) in the bulk solution concentration used in this ...
On the adsorption of sulfate on low Miller index Rh(hkl) electrodes: an in situ...
Moraes,Ines R. de; Nart,Francisco C.The adsorption of sulfate ion on Rh(111), Rh(100) and Rh(110) electrodes was studied using in situ FTIR reflection spectroscopy. For wavenumbers above 1200 cm-1, only one strong vibrational band is observed for adsorbed sulfate on the three low index rhodium surfaces. A weak band at 960 cm-1 is also observed for Rh(111). The strong band above 1200 cm-1 is potential dependent with a tuning rate of 50 cm-1 V-1. N...
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