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The Role of Oxidative Debris on Graphene Oxide Films
Author(s) -
LópezDíaz David,
Mercedes Velázquez Maria,
Blanco de La Torre Santiago,
PérezPisonero Ana,
Trujillano Raquel,
Fierro José Luis García,
Claramunt Sergi,
Cirera Albert
Publication year - 2013
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.201300620
Subject(s) - graphene , oxide , raman spectroscopy , monolayer , materials science , langmuir–blodgett film , chemical engineering , graphite , impurity , graphene oxide paper , langmuir , nanotechnology , chemistry , organic chemistry , composite material , physics , aqueous solution , engineering , optics , metallurgy
Abstract We study the effect of oxidative impurities on the properties of graphene oxide and on the graphene oxide Langmuir–Blodgett films (LB). The starting material was grupo Antolín nanofibers (GANF) and the oxidation process was a modified Hummers method to obtain highly oxidized graphene oxide. The purification procedure reported in this work eliminated oxidative impurities decreasing the thickness of the nanoplatelets. The purified material thus obtained presents an oxidation degree similar to that achieved by chemical reduction of the graphite oxide. The purified and non‐purified graphene oxides were deposited onto silicon by means of a Langmuir–Blodgett (LB) methodology. The morphology of the LB films was analyzed by field emission scanning microscopy (FE‐SEM) and micro‐Raman spectroscopy. Our results show that the LB films built by transferring Langmuir monolayers at the liquid‐expanded state of the purified material are constituted by close‐packed and non‐overlapped nanoplatelets. The isotherms of the Langmuir monolayer precursor of the LB films were interpreted according to the Volmer’s model.