Synthesis of a nanocomposite composed of reduced graphene oxide and gold nanoparticles

Abstract

We report a seeded-growth process that results in the adhesion of size-controlled gold (Au) nanoparticles (NPs) to the surface of reduced graphene oxide (rGO), leading to the formation of rGO-Au nanocomposites. The synthesis approach involves the utilization of Au molecular precursors (i.e., the seeds) bonded to oxygen functionalities which intrinsically exist on GO. Upon reduction of the Au precursors, surface deposition of Au NPs is ensured. It is found that the size of Au NPs is controlled via the variation of precursor concentration in the growth solution. The redox chemistry between GO and Au precursors causes the reduction of GO to rGO and the generation of Au NPs on the surface of rGO. Microscopic and spectroscopic measurements have been performed to provide evidence for the suggested redox chemistry. † Electronic supplementary information (ESI) available. See

Investigation of double-layer and pseudocapacitance of surface-modified ionic liquid-functionalized graphene oxide

“…2 shows the IR spectra for GO and IFGO. As expected, the IR spectrum for GO exhibits characteristic peaks at approximately 1800 and 1600 cm −1 which represent C_O and C_C bonds, respectively, as well as peaks at approximately 1400 and 1050 cm −1 which represent C-O (carboxy) and C-O (epoxy) bonds, respectively [38].…”

Highly oxidized graphene nanosheets via the oxidization of detonation carbon

“…However, the Drifts-FTIR spectrum of OGNs (Fig. 6b) has the adsorption bands centered at wave numbers that resemble those mentioned in the previous works [35][36][37][38][39] with the band at *1073 cm -1 attributed to C-O epoxy stretching vibrations, *1224 cm -1 due to C-OH stretching vibrations, *1623 cm -1 from deformation vibration of water molecules, *1734 cm -1 from C=O carbonyl stretching and *3613 cm -1 from stretching vibration of hydroxyl groups. Thus, the GNs have been oxidized extensively, and the surface has been decorated with aforementioned carbonyl, epoxy and hydroxyl functional groups.…”

Barium ferrite decorated reduced graphene oxide nanocomposite for effective electromagnetic interference shielding

“…24 The characteristic bands of GO were observed at 3432 cm À1 (O-H stretching vibrations), 1720 cm À1 (CQO stretching vibrations from carbonyl and carboxylic acid group), 1150 cm À1 and 1022 cm À1 (C-O stretching vibrations from epoxy and alkoxy group, respectively) and 875 cm À1 (C-O asymmetric stretching vibrations from epoxide group). 35 The FTIR spectrum of reduced graphene oxide indicates that exfoliation at 1050 1C results in the removal of most of the carboxyl groups and hydroxyl groups. Appearance of new peaks at 2921, 2852, and 1565 due to C-H stretching and CQC stretching vibrations are suggestive of the restoration of the sp 2 hybridized graphitic structure.…”

“…The characteristic features in the Raman spectra of the graphene like materials are the so-called D band, which locate at around 1350 cm À1 , corresponding to the breathing mode of k-point phonons of A 1g , and the G band, in the range of 1500-1600 cm À1 , attributed to the tangential stretching mode of the E 2g phonons of sp 2 atoms. 35 The intensity ratio of D and G band has been used as a measure of the degree of ordered and disordered structures in graphene sheets. On excitation at 514 nm, RGO presented Fig.…”