Uso de biotemplates na obtenção de microtubos com nanopartículas de ouro
Kubo, Andressa Mayumi
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Recently, the studies in the area of hybrid materials composed by biological structures have been of great interest, since they are considered versatile biotemplates in wich referred to the organization of nanostructured functional materials, mainly aiming technological attributions. Therefore, the central objective of this Master s Dissertation was the construction of microtubules formed by multilayers combined of gold and silver nanoparticles using as biotemplates the fungus Aspergillus aculeatus, which originated, thus, stable hybrid mesostructures with high potential of application to sensors and biosensors. The fungus was cultivated in a rich environment of citrate and, after the development of the hyphae, the colloidal dispersion of nanoparticles was added. Studies were done with relation to the effect of the synthesis temperature and the concentration of citrate in the average size of the gold nanoparticles and, posteriorly characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and spectroscopy of absorption in the UVVis region. The formation of multilayer composed by different metal nanoparticles was evaluated too. The hybrid materials were characterized by scanning electron microscopy with microanalysis by EDX (SEM-EDS). The obtained results showed that the either concentration of citrate or the temperature directly affect the average size of the gold nanoparticles with expressive results to the temperature. In which referred the formation of the microtubules with different metal nanoparticles, three distinct regions were identified, namely, containing just gold nanoparticles, containing gold and silver nanoparticles and containing just silver nanoparticles, fact discussed in this Master s Dissertation by the differentiation of hyphae growth inside the colloidal dispersion.