Functionalization of Reduced Graphite Oxide Sheets with a Zwitterionic Surfactant

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...

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Bibliographic Details
Published in:Chemphyschem 2012-11, Vol.13 (16), p.3682-3690
Main Authors: Martín-García, Beatriz, Velázquez, M. Mercedes, Rossella, Francesco, Bellani, Vittorio, Diez, Enrique, García Fierro, Jose Luis, Pérez-Hernández, Jose Antonio, Hernández-Toro, Juan, Claramunt, Sergi, Cirera, Albert
Format: Article
Language:English
Subjects:
Chemistry
conducting materials
Electric Conductivity
Exact sciences and technology
General and physical chemistry
graphene
Graphite - chemistry
graphite oxide
Langmuir blodgett films
Microscopy, Atomic Force
Oxidation-Reduction
Oxides - chemistry
Photoelectron Spectroscopy
Quaternary Ammonium Compounds - chemistry
Spectrum Analysis, Raman
Surface physical chemistry
Surface-Active Agents - chemistry
surfactants
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Summary: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. Graphite oxide reduction by hydrazine or vitamin C in the presence of zwitterionic surfactant DDPS leads to improved degrees of chemical reduction and network‐defect repair. Langmuir–Blodgett films of functionalized reduced graphite oxide (RGO) show self‐assembled nanoplatelets (see picture) and better electrical conductivity than films prepared from unfunctionalized RGO.
ISSN:1439-4235
1439-7641
DOI:10.1002/cphc.201200501