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Title: Conjugated-polyelectrolyte-functionalized reduced graphene oxide with excellent solubility and stability in polar solvents
Authors: Qi, X.
Pu, K.-Y. 
Zhou, X.
Li, H.
Liu, B. 
Boey, F.
Huang, W.
Zhang, H.
Keywords: Charge transfer
Reduced graphene oxide
Issue Date: 8-Mar-2010
Citation: Qi, X., Pu, K.-Y., Zhou, X., Li, H., Liu, B., Boey, F., Huang, W., Zhang, H. (2010-03-08). Conjugated-polyelectrolyte-functionalized reduced graphene oxide with excellent solubility and stability in polar solvents. Small 6 (5) : 663-669. ScholarBank@NUS Repository.
Abstract: Conjugated-polyelectrolyte (CPE)-functionalized reduced graphene oxide (rGO) sheets are synthesized for the first time by taking advantage of a specially designed CPE, PFVSO3, with a planar backbone and charged sulfonate and oligo(ethylene glycol) side chains to assist the hydrazinemediated reduction of graphene oxide (GO) in aqueous solution. The resulting CPE-functionalized rGO (PFVSO3-rGO) shows excellent solubility and stability in a variety of polar solvents, including water, ethanol, methanol, dimethyl sulfoxide, and dimethyl formamide. The morphology of PFVSO 3-rGO is studied by atomic force microscopy, X-ray diffraction, and transmission electron microscopy, which reveal a sandwich-like nanostructure. Within this nanostructure, the backbones of PFVSO3 stack onto the basal plane of rGO sheets via strong p-p interactions, while the charged hydrophilic side chains of PFVSO3 prevent the rGO sheets from aggregating via electrostatic and steric repulsions, thus leading to the solubility and stability of PFVSO3-rGO in polar solvents. Optoelectronic studies show that the presence of PFVSO3 within rGO induces photoinduced charge transfer and p-doping of rGO. As a result, the electrical conductivity of PFVSO3-rGO is not only much better than that of GO, but also than that of the unmodified rGO. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
Source Title: Small
ISSN: 16136810
DOI: 10.1002/smll.200902221
Appears in Collections:Staff Publications

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