NDLI: Graphene oxide and shape-controlled silver nanoparticle hybrids for ultrasensitive single-particle surface-enhanced Raman scattering (SERS) sensing

Content Provider	Royal Society of Chemistry (RSC)
Author	Lee, Yih Hong Pedireddy, Srikanth Zhang, Qi Ling, Xing Yi Fan, Wei Liu, Tianxi
Copyright Year	2014
Abstract	Graphene oxide (GO) is an emerging material for surface-enhanced Raman scattering (SERS) due to its strong chemical enhancement. Studying the SERS performance of plasmonic nanoparticle/GO hybrid materials at the single particle level is crucial for direct probing of the chemical effect of GO on plasmonic nanoparticles. In this work, we integrate GO and shape-controlled Ag nanoparticles to create hybrid nanomaterials, and the chemical enhancement arising from GO is investigated using single-particle SERS measurements. Ag nanoparticle@GO hybrid nanostructures are prepared by assembling Ag nanoparticles, including spheres, cubes and octahedra with GO sheets. The SERS behaviors of the hybrid nanostructures are characterized, and 2–3 times enhanced SERS intensities are detected from the Ag nanoparticle@GO hybrid nanostructures as compared to pure Ag nanoparticles. Furthermore, we probe the mechanism of SERS enhancement in the hybrid nanostructures by changing the surface coverage of GO on Ag octahedra, by using reduced GO in place of GO as well as by using probe molecules of different electronegativities. This hybrid system is an excellent candidate for single-particle SERS sensors. Sub-nanomolar levels of aromatic molecules are detected using a single Ag/GO hybrid nanomaterial. This as-prepared GO and shape-controlled Ag nanoparticle hybrid is capable of serving as a high performance SERS platform, providing new opportunities for efficient chemical and biological sensing applications.
Starting Page	4843
Ending Page	4851
Page Count	9
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	6
Issue Number	9
Journal	Nanoscale
DOI	10.1039/c3nr06316j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Graphite oxide SERS Nanoparticle Surface-enhanced Raman spectroscopy Octahedron Nanomaterials Electronegativity
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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