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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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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]
Total Authors: 13
Affiliation:
[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
Total Affiliations: 6
Document type: Journal article
Source: Materials Chemistry and Physics; v. 165, p. 125-133, SEP 1 2015.
Web of Science Citations: 2
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. (AU)

FAPESP's process: 13/19420-0 - Gas sensors from organic thin-film transistors
Grantee:Marco Roberto Cavallari
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 15/06064-6 - Functional organic molecules and inorganic oxides for the development of new materials
Grantee:Eduardo Rezende Triboni
Support type: Regular Research Grants
FAPESP's process: 11/17184-1 - Study and development of chemical sensors for non-invasive diseases diagnosis in human beings
Grantee:Ely Antonio Tadeu Dirani
Support type: Regular Research Grants