Gas sensing and conductivity relationship on nanoporous thin films: A CaCu3Ti4O12 case study

Autor(es)

Felix, A. A. ^[1] ; Longo, E. ^[1] ; Varela, J. A. ^[1] ; Orlandi, M. O. ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Inst Chem, Dept Phys Chem, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Thin Solid Films; v. 604, p. 69-73, APR 1 2016.
• Citações Web of Science: 5

Resumo

In thiswork, CaCu3Ti4O12 (CCTO) thin films were synthesized with the polymeric precursormethod and characterized by structural (X-ray diffraction) and morphological (scanning electron microscopy) techniques. These films were composed of a single CCTO phase and presented high surface porosity. The gas sensing response and conductivity-type relationship were investigated by two different approaches. Gas sensing measurements performed at different temperatures using different atmospheres showed that the CCTO has n-type gas sensing behavior and can detect small amounts of oxidizing gases with high sensitivity and selectivity. The type of intrinsic conductivity was also investigated through thermopower measurements, which indicated intrinsic n-type conductivity in CCTO thin films prepared with the polymeric precursor method and confirmed the direct relationship between the gas sensing behavior and the intrinsic conductivity of CCTO. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 09/00367-6 - Estudo das Propriedades de Filmes Nanoestruturados de CaCu3Ti4O12
• Beneficiário: Anderson André Felix
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 13/14647-6 - Sensores de gás a base de óxidos semicondutores do tipo-p: estudos avançados in-situ e operando
• Beneficiário: Anderson André Felix
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• 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