Graphene modulated 2D assembly of plasmonic gold nanostructure on diamond-like carbon substrate for surface-enhanced Raman scattering

A close-packed 2D assembly of plasmonic gold nanostructure was fabricated on a diamond-like carbon film by a two-step electrodeposition via reduced graphene oxide (rGO) modulation. The oxygen functionalities at the rGO surface which were controlled by changing electrochemical reduction time of GO provided reactive sites for nucleation and growth of gold nanoparticles. The Raman intensity of rhodamine B obtained from the gold assembly showed an 860-fold increase compared with that from Si reference, indicating a coupling of localized electromagnetic field enhancement and chemical enhancement Our research offered a novel way for metallic plasmonic fabrication to realize their potential applications in biochemical analysis, environmental monitoring, disease detection and food safety. (C) 2012 Elsevier B.V. All rights reserved.