Abstract
In our study, graphene oxide is synthesized by Hummers method. And then, carboxylic acid functionalized graphene (graphene-COOH), thiol-functionalized graphene (graphene-SH), and highly dispersive graphene are prepared by chemical modification of respective groups on the graphene surface. Furthermore, we explore a solution-based approach to prepare three differently functionalized graphene-gold composites by one-step chemical reduction ofAuCl4 -ions in respective functionalized graphene suspensions, where the gold nanoparticles are deposited on the functionalized graphene surface during their synthesis process. In addition, we compare the influence of surface functionalization on the growth of gold nanoparticles on graphene surface. Transmission electron morphology (TEM) and ultraviolet-visible (UV-Vis) spectroscopy are employed to study the effect of surface functionalities on AuNPs distribution onto the graphene surface and demonstrate the successful immobilization of AuNPs on graphene surface.
Highlights
The increasing interest in carbon family materials has opened new ways for producing arrays of novel functional nanomaterials
Since abundant oxygen functional groups on the both basal plane and edge of Graphite oxide (GO) can be used as anchoring sites for metal nanoparticles, it is possible to use them as a support to produce graphene-nanoparticle hybrids [5]
A number of studies show that the hybridization of gold nanoparticles with GO followed by chemical reduction could improve the electrical conductivity and Raman signal [15, 16]
Summary
The increasing interest in carbon family materials has opened new ways for producing arrays of novel functional nanomaterials. Since abundant oxygen functional groups on the both basal plane and edge of GO can be used as anchoring sites for metal nanoparticles, it is possible to use them as a support to produce graphene-nanoparticle hybrids [5]. The covalently attaching oxygen groups, including hydroxyl, epoxy groups on the basal plane and carboxylic groups at the edge of GO surface is versatile and effective method to prepare graphene-based hybrid materials by the chemical modification of graphene [6]. The dispersion of metal nanoparticles on graphene sheets may result in the production of some excellent materials for various potential applications [7,8,9,10]. The drawbacks for graphene-based hybrid materials are that the particle diameters of prepared gold nanoparticles are nonuniform, and the interaction between GO and AuNPs are weak
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