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Functionalization of Reduced Graphite Oxide Sheets with a Zwitterionic Surfactant
Author(s) -
MartínGarcía Beatriz,
Velázquez M. Mercedes,
Rossella Francesco,
Bellani Vittorio,
Diez Enrique,
García Fierro Jose Luis,
PérezHernández Jose Antonio,
HernándezToro Juan,
Claramunt Sergi,
Cirera Albert
Publication year - 2012
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201200501
Subject(s) - surface modification , raman spectroscopy , graphite oxide , graphite , pulmonary surfactant , chemical engineering , x ray photoelectron spectroscopy , oxide , scanning electron microscope , chemistry , conductivity , materials science , analytical chemistry (journal) , nanotechnology , organic chemistry , composite material , physics , optics , engineering
Films of a few layers in thickness of reduced graphite oxide (RGO) sheets functionalized by the zwitterionic surfactant N ‐dodecyl‐ N , N ‐dimethyl‐3‐ammonio‐1‐propanesulfonate (DDPS) are obtained by using the Langmuir–Blodgett method. The quality of the RGO sheets is checked by analyzing the degrees of reduction and defect repair by means of X‐ray photoelectron spectroscopy, atomic force microscopy (AFM), field‐emission scanning electron microscopy (SEM), micro‐Raman spectroscopy, and electrical conductivity measurements. A modified Hummers method is used to obtain highly oxidized graphite oxide (GO) together with a centrifugation‐based method to improve the quality of GO. The GO samples are reduced by hydrazine or vitamin C. Functionalization of RGO with the zwitterionic surfactant improves the degrees of reduction and defect repair of the two reducing agents and significantly increases the electrical conductivity of paperlike films compared with those prepared from unfunctionalized RGO.