A simple visible light photo-assisted method for assembling and curing multilayer GO thin films

Autor(es):Mostrar menos -

Pinheiro da Silva, Mauro Francisco ^{[1, 2]} ; de Oliveira, Debora Rose ^{[3, 1]} ; Cavallari, Marco Roberto ^[1] ; Tadeu Dirani, Ely Antonio ^{[4, 1, 2]} ; Triboni, Eduardo Rezende ^{[4, 1]} ; Paterno, Leonardo Giordano ^{[5, 1]} ; Fonseca, Fernando Josepetti ^{[1, 2]} ; Ando, Romulo Augusto ^{[3, 1]} ; Baptista, Mauricio da Silva ^{[3, 1]} ; Landers, Richard ^{[6, 1]} ; Politi, Mario Jose ^{[3, 1]} ; Isolani, Paulo Celso ^{[3, 1]} ; Bernardo Lenz e Silva, Guilherme Frederico ^[2]

Afiliação do(s) autor(es)

^[1] Pontificia Univ Sao Paulo, Fac Ciencias Exatas & Tecnol, BR-01303050 Sao Paulo, SP - Brazil

^[2] Univ Sao Paulo, Escola Politecn, Dept Engn Met & Mat, PMT EPUSP, BR-05508030 Sao Paulo, SP - Brazil

^[3] Inst Criminalist Secretaria Seguranca Estado Sao, Nucleo Quim, BR-05507060 Sao Paulo, SP - Brazil

^[4] Univ Sao Paulo, Inst Quim, BR-05513970 Sao Paulo, SP - Brazil

^[5] Univ Brasilia, Inst Quim, BR-70904970 Brasilia, DF - Brazil

^[6] Univ Estadual Campinas, Dept Fis Aplicada, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Materials Chemistry and Physics; v. 165, p. 125-133, SEP 1 2015.
• Citações Web of Science: 2

Resumo

A simple and efficient method for deposition of reduced graphene oxide (RGO) thin firms onto arbitrary substrates is described. The present protocol consists in the application of radial compression to a thin layer of graphene oxide (GO) formed at the air liquid interface of an ammoniacal dispersion of graphene oxide by continuous irradiation with visible light, that drives both the formation and curing of the film. Both infrared and near infrared luminescence spectroscopies were used for the proposition of a chemical mechanism in which the in situ singlet oxygen Delta O-1(2), generated by the photosensitization of molecular oxygen to visible light, initiates the formation and curing of the film. The GO and RGO films display Raman spectral signatures typical of graphene - based materials, with thickness of ca. 20 nm as evaluated by atomic force microscopy. The deposited films exhibited good transparency to visible light (max. 85%; 550 +/- 2 nm), electrical resistivity equals to 14 +/- 0.02 0 Omega m, sheet resistance equals to 5 k Omega sq(-1) with associated charge carrier mobility of 200 cm(2)/V s. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 11/17184-1 - Estudo e desenvolvimento de sensores químicos para diagnóstico não-invasivo de doenças em seres humanos
• Beneficiário: Ely Antonio Tadeu Dirani
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 15/06064-6 - Moléculas orgânicas funcionais e óxidos inorgânicos para o desenvolvimento de novos materiais
• Beneficiário: Eduardo Rezende Triboni
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/19420-0 - Sensores de gás a base de transistores de filmes finos orgânicos
• Beneficiário: Marco Roberto Cavallari
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado