Regulatory network modelling of iron acquisition by a fungal pathogen in contact with epithelial cells

Peer reviewedPublisher PD

Photoelectrochemical properties of poly(terthiophene) films modified with a fullerene derivative

This work reports on the photoelectrochemical properties of an interface comprised by poly(terthiophene) films electrochemically synthesized onto indium-tin oxide substrates and modified with 1-(3-methoxycarbonyl)-propyl-l-phenyl-(6,6)C-61- Important photoelectrical parameters, such as flat band potential, density of charge carriers and depletion layer width were determined for the pristine and hybrid filins. The cathodic photocurrent reflected the p-type semiconducting behavior of the electrosynthesized poly(terthiophene)s. Addition of the acceptor molecule improves the photocurrent at zero bias (similar to 6 mu A cm(-2) at 100 mW cm(-2)) indicating the fullerene derivative acts as an exciton dissociation center, improving the number of charge carriers transported through the polymer to reach the solid-liquid electrolyte interface. (c) 2006 Elsevier B.V. All rights reserved.51542644264

Large-Area Fabrication of Periodic Arrays of Nanoholes in Metal Films and Their Application in Biosensing and Plasmonic-Enhanced Photovoltaics

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Plasmonics is a fast developing research area with a great potential for practical applications. However, the implementation of plasmonic devices requires low cost methodologies for the fabrication of organized metallic nanostructures that covers a relative large area (similar to 1 cm(2)). Here the patterning of periodic arrays of nanoholes (PANHs) in gold films by using a combination of interference lithography, metal deposition, and lift off is reported. The setup allows the fabrication of periodic nanostructures with hole diameters ranging from 110 to 1000 rim, for 450 and 1800 nm of periodicity, respectively. The large areas plasmonic substrates consist of 2 cm x 2 cm gold films homogeneously covered by nanoholes and gold films patterned with a regular microarray of 200 mu m diameter circular patches of PANHs. The microarray format is used for surface plasmon resonance (SPR) imaging and its potential for applications in multiplex biosensing is demonstrated. The gold films homogeneously covered by nanoholes are useful as electrodes in a thin layer organic photovoltaic. This is first example of a large area plasmonic solar cell with organized nanostructures. The fabrication approach reported here is a good candidate for the industrial-scale production of metallic substrates for plasmonic applications in photovoltaics and biosensing.202239183924NSERC strategic network for bioplasmonic systems (Biopsys)NSERC inter-american collaboration on materials research (CIAM)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Department of Foreign Affairs and International Trade of CanadaNSERCOrganization of American StatesFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES