Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/243055
Type: Artigo
Title: A simple visible light photo-assisted method for assembling and curing multilayer GO thin films
Author: Silva, Mauro Francisco Pinheiro da
Oliveira, Débora Rose de
Cavallari, Marco Roberto
Dirani, Ely Antonio Tadeu
Triboni, Eduardo Rezende
Paterno, Leonardo Giordano
Fonseca, Fernando Josepetti
Ando, Rômulo Augusto
Baptista, Maurício da Silva
Landers, Richard
Politi, Mário Jose
Isolani, Paulo Celso
Silva, Guilherme Frederico Bernardo Lenz e
Abstract: 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.
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.
Subject: Filmes finos
Materiais óticos
Condutividade elétrica
Semicondutores
Revestimentos
Country: Holanda
Editor: Elsevier
Citation: A Simple Visible Light Photo-assisted Method For Assembling And Curing Multilayer Go Thin Films. Elsevier Science Sa, v. 165, p. 125-133 SEP-2015.
Rights: fechado
Identifier DOI: 10.1016/j.matchemphys.2015.09.006
Address: https://www.sciencedirect.com/science/article/pii/S0254058415303254
Date Issue: 2015
Appears in Collections:IFGW - Artigos e Outros Documentos

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