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Issue 12, 2015
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The structure and properties of graphene on gold nanoparticles

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Abstract

Graphene covered metal nanoparticles constitute a novel type of hybrid material, which provides 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 are 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 with 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.

Graphical abstract: The structure and properties of graphene on gold nanoparticles

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Supplementary files

Article information


Submitted
13 Jan 2015
Accepted
16 Feb 2015
First published
19 Feb 2015

Nanoscale, 2015,7, 5503-5509
Article type
Paper

The structure and properties of graphene on gold nanoparticles

Z. Osváth, A. Deák, K. Kertész, Gy. Molnár, G. Vértesy, D. Zámbó, C. Hwang and L. P. Biró, Nanoscale, 2015, 7, 5503
DOI: 10.1039/C5NR00268K

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