Issue 11, 2012
From the journal:

Journal of Materials Chemistry

Graphene oxide reduced and modified by soft nanoparticles and its catalysis of the Knoevenagel condensation†

Tao Wu,a   Xingrui Wang,a   Haixia Qiu,a   Jianping Gao,*a   Wei Wangb  and  Yu Liu*a  

* Corresponding authors

a School of Science, Tianjin University, Tianjin, P. R. China
E-mail: liuyu2010@hotmail.com
Fax: +86 22 274 034 75

b School of Chemical Engineer & Technology, Tianjin University, Tianjin, P. R. China

Abstract

An approach to prepare reduced graphene oxide (RGO) was developed using soft nanoparticles, amino-terminated poly(amidoanime) (PAMAM) dendrimers, as both a reducing agent and a stabilizing agent. Several factors that affect the reduction of graphene oxide (GO), including the PAMAM generation, the ratio of PAMAM/GO, the pH, and the reduction temperature were investigated. The reduced graphene oxide was characterized with UV-visible absorption spectroscopy, Raman spectroscopy, X-ray diffraction spectroscopy, thermo-gravimetric analysis, X-ray photoelectron spectroscopy and transmission electron microscopy. The PAMAM dendrimers efficiently reduced GO in a short time, and their adsorption onto the RGO nanosheets allows RGO to stably disperse in water and organic solvents, such as N,N-dimethyl formamide and dimethyl sulfoxide. PAMAM modified RGO can catalyze the Knoevenagel condensation with yields up to 99%, and thus is a very active organocatalyst.

Graphical abstract: Graphene oxide reduced and modified by soft nanoparticles and its catalysis of the Knoevenagel condensation

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Article information

DOI
https://doi.org/10.1039/C2JM15311D
Article type
Paper
Submitted
19 Oct 2011
Accepted
05 Jan 2012
First published
30 Jan 2012

J. Mater. Chem., 2012,22, 4772-4779

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Graphene oxide reduced and modified by soft nanoparticles and its catalysis of the Knoevenagel condensation

T. Wu, X. Wang, H. Qiu, J. Gao, W. Wang and Y. Liu, J. Mater. Chem., 2012, 22, 4772 DOI: 10.1039/C2JM15311D

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