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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/100/14547

Title: Spectroscopic studies of large sheets of graphene oxide and reduced graphene oxide monolayers prepared by Langmuir-Blodgett technique
Authors: SUTAR, DS
NARAYANAM, PK
SINGH, G
BOTCHA, VD
TALWAR, SS
SRINIVASA, RS
MAJOR, SS
Keywords: Graphene
Graphene oxide
Reduced graphene oxide
Langmuir-Blodgett
X-ray photoelectron spectroscopy
Raman spectroscopy
Issue Date: 2012
Publisher: ELSEVIER SCIENCE SA
Citation: THIN SOLID FILMS, 520(18)5991-5996
Abstract: Graphene oxide (GO) sheets prepared by chemical exfoliation were spread at the air-water interface and transferred to silicon substrates by Langmuir-Blodgett technique as closely spaced monolayers of 20-40 mu m size. Hydrazine exposure followed by annealing in vacuum and argon ambient results in the formation of reduced graphene oxide (RGO) monolayers, without significantly affecting the overall morphology of the sheets. The monolayer character of both GO and RGO sheets was ascertained by atomic force microscopy. X-ray photoelectron spectroscopy supported by Fourier transform infrared spectroscopy revealed that the reduction process results in a significant decrease in oxygen functionalities, accompanied by a substantial decrease in the ratio of non-graphitic to graphitic (sp(2) bonded) carbon in the monolayers from 1.2 to 0.35. Raman spectra of GO and RGO monolayers have shown that during the reduction process, the G-band shifts by 8-12 cm(-1) and the ratio of the intensities of D-band to G-band, I(D)/I(G) decreases from 1.3 +/- 0.3 to 0.8 +/- 0.2, which is in tune with the smaller non-graphitic carbon content of RGO monolayers. The significant decrease in I(D)/I(G) has been explained by assuming that substantial order is present in precursor GO monolayers as well as RGO monolayers obtained by solid state reduction. (C) 2012 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.tsf.2012.05.018
http://dspace.library.iitb.ac.in/jspui/handle/100/14547
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