| 초록 |
Among various types of graphene and related carbon nanostructures, a stable suspension of graphene oxide (GO) is the common choice over pristine graphene owing to its facile synthetic nature in a controlled, scalable, and reproducible manner. The abundant oxygen-containing functional groups such as epoxide, alcohol, and carboxylic acids provide GO with excellent aqueous dispersity and also offer anchors for further chemical modifications. Au clusters and Au nanoparticles (AuNPs), containing several to a few hundred Au atoms, have attracted much attention in recent years because of their unique properties, such as photoluminescence and ferromagnetism, and the dispersion of Au nanoparticles on graphene sheets provides a potential applications in sensing, bioimaging, catalytic, magnetic, and optoelectronic materials. Although various synthetic routes, such as the chemical reduction of Au precursors in the presence of pristine graphene or chemically modified graphene derivates, have been reported to prepare the graphene/AuNPs hybrid, few papers thus far have reported the site-selective self-assembly of AuNPs on graphene sheets. We have anchored the AuNPs on graphene edge or graphene basal plane selectively by thiol-functionaliztion of graphene oxide or reduced graphene oxide. |
