The structure and properties of graphene on gold nanoparticles

Nanoscale
Z OsváthL P Biró

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.

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Citations

Sep 5, 2015·Journal of medical and biological engineering·Chieh-Hsiao ChenJia-Jin Chen
Jun 3, 2016·ACS Applied Materials & Interfaces·Qiran CaiLu Hua Li
Oct 7, 2016·Physical Chemistry Chemical Physics : PCCP·Niloofar HaghighianMaurizio Canepa
Sep 27, 2018·Physical Chemistry Chemical Physics : PCCP·Haiyan NanShaoqing Xiao
Sep 21, 2020·Journal of Molecular Modeling·Jamelah S Al-OtaibiC Van Alsenoy
Oct 30, 2020·Nanomaterials·Theodoros PavloudisRichard E Palmer

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