Structure and properties of graphene on gold nanoparticles

Osváth, Zoltán and Deák, András and Kertész, Krisztián Imre and Molnár, György and Vértesy, Gábor and Biró, László Péter (2015) Structure and properties of graphene on gold nanoparticles. NANOSCALE. in press. ISSN 2040-3364

Preview

Text Nanoscale_Structure_and_properties_of_graphene_gold_u_095027.411252.pdf - Published Version Download (1MB) | Preview

Abstract

Graphene covered metal nanoparticles constitute a novel type of hybrid materials, which provide a unique platform to study plasmonic effects, surface-enhanced Raman scattering (SERS), and metal-graphene interactions at the nanoscale. Such a hybrid material is fabricated by transferring graphene grown by chemical vapor deposition onto closely spaced gold nanoparticles produced on a silica wafer. The morphology and physical properties of nanoparticle-supported graphene is investigated by atomic force microscopy, optical reflectance spectroscopy, scanning tunneling microscopy and spectroscopy (STM/STS), and confocal Raman spectroscopy. This study shows that the graphene Raman peaks are enhanced by a factor which depends on the excitation wavelength, in accordance with the surface plasmon resonance of the gold nanoparticles, and also on the graphene-nanoparticle distance which is tuned by annealing at moderate temperatures. The observed SERS activity is correlated to the nanoscale corrugation of graphene. STM and STS measurements show that the local density of electronic states in graphene is modulated by the underlying gold nanoparticles.

Actions (login required)

Edit Item