Grazing Angle Photoluminescence of Porous Alumina as an Analytical Transducer for Gaseous Ethanol Detection

Autor(es)

Guerreiro, Haroldo A. ^{[1, 2]} ; Trivinho-Strixino, Francisco ^[3] ; Chiquito, Adenilson J. ^[1] ; Guimaraes, Francisco E. G. ^[4] ; Pereira, Ernesto C. ^[5]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Amazonas, Inst Ciencias Exatas, Dept Fis, BR-69077000 Manaus, Amazonas - Brazil

^[3] Univ Fed Sao Carlos, Dept Fis Quim & Mat, BR-18052780 Sorocaba, SP - Brazil

^[4] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[5] Univ Fed Sao Carlos, Dept Quim, LIEC, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Nanoscience and Nanotechnology; v. 14, n. 9, p. 6653-6657, SEP 2014.
• Citações Web of Science: 6

Resumo

Porous alumina was used to build an optical sensor for gaseous ethanol detection. The photoluminescence collected in a grazing angle was used as a transducer signal. The photoluminescence detected with this optical setup shows well resolved Fabry-Perot type interference fringes at room temperature, whose position and shape are strongly dependent on the ethanol fraction adsorbed on the porous alumina surface. According to the surface porous morphology, different finesse and resolution between the emission fringes were observed. The analytical response of the sensor was tested in terms of spectral displacement of the fringes when in contact with gaseous ethanol. The sensor was tested for different temperatures and at 25 C it presented the highest sensibility. The difference in the sensibility is a function of the temperature and can be related both to the modification of ethanol vapor pressure and the kinetics of adsorption processes at the walls of the glass cell and the porous alumina sample. (AU)

• Processo FAPESP: 10/10813-0 - Fabricação de filmes de óxidos nanoestruturados por métodos eletroquímicos e sua aplicação como sensores
• Beneficiário: Francisco Trivinho Strixino
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 10/07794-4 - Preparação e caracterização de filmes de multicamadas metálicas para eletrocatálise
• Beneficiário: Ernesto Chaves Pereira de Souza
• Modalidade de apoio: Auxílio à Pesquisa - Regular