Investigação estrutural de filmes moleculares por microscopia de varredura por força / Structural Investigation of molecular films by scanning force microscopy

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Molecular films constituted by ruthenium polypyridine complexes, triangular ruthenium acetate clusters, and polymetallated porphyrins have been systematically investigated, providing a wide range of functional interfaces for electronic devices, sensors, photoconversion and electrocatalytical cells. Such films have been generated by dip coating, drop casting and electrochemical deposition, displaying very rich morphological aspects, which have been investigated by means of scanning probe microscopy. AFM studies have been carried out for the molecular films generated by dip coating. The images were successfully analysed using the Gwyddion software, allowing the evaluation of the rugosity parameters determining the grain shapes and distribution over the films. The films obtained by drop casting have been investigated by means of MACMode SFM, exhiting a wide variety of morphologies, mainly associated with the dewetting of the samples, under the influence of specific molecular interactions. Electropolymerization of molecular complexes have been monitored by SFM techniques, including the electroconducting mode to probe the conductivity of the polymeric films. Gold anchored films of DNA and magnetic nanoparticles have also been successfully investigated by MACMode SFM and magnetic SFM techniques, respectively. Finally, a new approach for ultra-sensitive probes, based on the immobilization of magnetic nanoparticles onto the MACLevers has been devised, allowing the detection of sub-picogram amounts of analytes

ASSUNTO(S)

thin films nanosensores afm nanosensors afm filmes finos

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