Utilização da sacarose no crescimento de filmes de óxidos de vanádio via spray-pirólise

• Ano de defesa: 2014
• Autor(a) principal: Santos, Maria do Socorro de Andrade Neves
• Orientador(a): Souza Junior, Edvaldo Alves de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Programa de Pós-Graduação: Pós-Graduação em Física
• Palavras-chave em Português: Físico-química; Vanádio; Metais de transição; Óxido de vanádio; Sacarose; Filmes finos; Pirólise
• Palavras-chave em Inglês: Chemistry, Physical and theoretical; Sucrose; Thin films; Transition metals; Vanadium; Vanadium oxide
• Área do conhecimento CNPq: CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA
• Link de acesso: https://ri.ufs.br/handle/riufs/5336

In this work, aqueous solutions were obtained by adding sucrose to produce thin films of oxides of vanadium via the spray pyrolysis technique. Solutions with different concentrations of vana-dium chloride and sucrose were prepared to study their influence on the structural, morpholog-ical and electrical properties of the films. All samples were analyzed using structural character-ization techniques (XRD), morphology (SEM) and electric (both ends). The results showed that it was possible to observe training phase V2O5 and V3O7, 200mM and the concentration of vanadium chloride was the condition that the synthesis had better crystallization of vanadium pentoxide. The results of electrical measurements, resistance versus temperature show that the deposited film has behavior of a semiconductor. The results also conclude that the band-gap model can describe the mechanism of conduction in successful films.