Synthesis of Graphene-Gold Nanocomposites via Sonochemical Reduction

Abstract

A Reduced reduced graphene oxide (RGO)-gold (Au) nanoparticle (NP) nanocomposite was synthesized by simultaneously reducing the Au ions and depositing Au NPs on onto the surface surface of the RGOsRGO simultaneously. To facilitate the reduction of Au ions and the generation of oxygen functionalities for anchoring the Au NPs on the RGOsRGO, ultrasound irradiation was applied to the mixture of reactants. The functional groups were investigated with FT-IR spectra. From the Raman and XPS spectra, the oxygen groups were identified as hydroxyl, epoxy, and carboxyl groups, the same as the one from graphene oxide (GO). As a result, the dense and uniform deposition of nanometer-sized Au NPs with nanometer size was observed on the RGO sheets sheet was observed with from the TEM imagesimage. The Oxygen oxygen functional groups that formed on the surface surface of the RGOs RGO seemed to have served serve as links for Au NPs NP attachment, through the electrostatic attraction of Au ions. Hybrid materials could thus be produced in a short time, with a high yield, by via ultrasound application. Besides, it ultrasound application could can readily take goldAu- binding- peptide (GBP)-modified biomolecules, readily implying its possibility in possible biological applications.

Graphene–Gold Nanoparticles Hybrid—Synthesis, Functionalization, and Application in a Electrochemical and Surface-Enhanced Raman Scattering Biosensor

“…For example, Park et al reported the synthesis of rGO–AuNPs nanocomposites by simultaneous reduction and deposition of AuNPs onto the surface of rGO by ultrasonic irradiation. Here, the attachment of AuNPs onto the rGO surface is mediated via the electrostatic attraction of Au ions to oxygen functionalities on the rGO surface [104]. On the other hand, Vinodgopal et al [105] reported simultaneous and sequential reduction of GO and HAuCl 4 in 2% polyethylene glycol aqueous solution to fabricate rGO–Au nanocomposites by maintaining an ultrasonic frequency of 211 kHz.…”

Controlled synthesis of dendritic gold nanostructures by graphene oxide and their morphology-dependent performance for iron detection in coastal waters

“…26 Subsequently, oxygencontaining groups served as the links for AuNPs to control the growth of Au nanocrystals. 27 Thus, the oxygen-containing groups on GO controlled the diffusion of the AuCl 4 À ions, the subsequent generation of Au nuclei at the initial beginning stage and the growth direction of the Au nanocrystals in the electrochemical synthesis process. The mechanism of GO as the morphology-controlling agent for the synthesis of DAuNs was also illustrated in Scheme 1.…”

Practical Design of Green Catalysts for PET Recycling and Energy Conversion

“…Our group applied the ultrasound irradiation method for the fabrication of metal-doped silica nanocomposites [8,11,23,24]. The acoustic cavitation phenomenon facilitates interparticle collision between metal and support material, inducing the binding between metal and support [25,26].…”