Engineering two-dimensional gold nanostructures using graphene oxide nanosheets as a template

Abstract

The rich plasmon resonance modes and local field enhancements of two-dimensional (2D) noble metal nanostructures have boosted their application in distinct areas like catalysis, photonics, medicine and sensing. Here, we develop a unique strategy for the controlled growth of asymmetric 2D gold nanostructures in aqueous media using graphene oxide as a template. By performing mild reduction of gold ions on the surface of Au seeds (∼2 nm) attached to graphene oxide nanosheets, the anisotropic growth of 2D gold nanostructures can be carried out through a simple procedure with a tunable control of the final size, shape and thickness, and consequently on their optical properties, without using surfactants.

Ultrasmall (<2 nm) Au@Pt Nanostructures: Tuning the Surface Electronic States for Electrocatalysis

“…The synthesis and functionalization of the graphene oxide with the bipyridinium alkoxysilane (GO/Bipy) were carried out according to the procedure recently reported by our group …”

Simultaneous Synthesis of One-and Two-Dimensional Gold Nanostructures/Reduced Graphene Oxide Composites in the Redox-Active Ionic Liquid/Water Interfacial System

“…Considering the 2D planar characteristic of GO, the formation of Au 2D nanostructures was likely to be templated by GO. According to some references, Au NS/GO composites were prepared by immobilization of the Au precursor or the reducing agent on the GO surface − so that Au could grow toward 2D nanostructures by taking GO as the template. In these cases, through anchoring one of the reaction species on the GO planes, the free growth of Au in the directions other than along the GO plane was prevented, so that GO could play the role of the template to induce the 2D growth of Au.…”

“…Moreover, studies revealed that GO contributes to improving surface-enhanced Raman spectroscopy (SERS) activity through chemical enhancement for Au-GO composites [28,29]. To date, there are several strategies to produce anisotropic Au nanostructures on graphene derivatives [20,30,[31][32][33][34][35][36][37][38]. Xiao et al reported an in situ synthesis of ultrathin Au nanowires (NWs) on GO sheets by using 1-amino-9-octadecene adsorbed on the GO surface as the reducing agent for AuCl4 − as well as the 1D structure-directing agent [20].…”

“…The electrical conductivity of composites can be greatly improved after GO is reduced to rGO . Moreover, studies revealed that GO contributes to improving surface-enhanced Raman spectroscopy (SERS) activity through chemical enhancement for Au–GO composites. , To date, there are several strategies to produce anisotropic Au nanostructures on graphene derivatives. ,− Huang et al reported an in situ synthesis of ultrathin Au nanowires (NWs) on GO sheets by using 1-amino-9-octadecene adsorbed on the GO surface as the reducing agent for AuCl 4 – as well as the 1D structure-directing agent . Zhang et al fabricated Au nanoplate/GO composites using tannic acid as the reducing agent for Au precursor and the immobilizing agent on GO surfaces .…”

Graphene Oxide Theranostic Effect: Conjugation of Photothermal and Photodynamic Therapies Based on an in vivo Demonstration

“…GO was prepared and characterized following preview report. [25][26][27] The oxidation time of graphite was increased, in order to obtain GO sheets with smaller lateral dimensions. Briefly, approximately 1 g of graphite (Sigma-Aldrich, 98.4% of the flakes with a particle size of 100 mm) and 0.76 g of sodium nitrate (Merck, 99.9% purity) were added in a reaction flask and dispersed them in 35.0 mL of concentrated sulfuric acid (Synth, 98.0% purity), leaving the mixture under stirring for 15 minutes in an ice bath.…”