Issue 69, 2015

Graphene oxide wrapped individual silver nanocomposites with improved stability for surface-enhanced Raman scattering

Abstract

As one of the best materials for surface-enhanced Raman scattering (SERS), Ag suffers from its tendency to oxidation, posing serious limitations for its use as a reliable long-term SERS substrate. Graphene oxide (GO) is considered to be a promising SERS-active platform due to the observed chemical enhancement originating from the interaction between probe molecules and oxygen containing functional groups on its surface. Herein, we present the synthesis of core–shell GO wrapped individual Ag nanocomposites (NCs) by electrostatic assembly of GO on SiO2@Ag nanostructures. The SERS enhancement factor (EF) of probe molecules on SiO2@Ag@GO is 1.8 times that on SiO2@Ag, due to the chemical enhancement brought upon by GO. Moreover, the GO surrounding the SiO2@Ag nanoparticles (NPs) shields Ag from oxidation, making them remain stable and display highly retained SERS activities even after long-term storage, while the bare SiO2@Ag NPs would have lost ∼80% of the original activity after the same treatment. As the NCs have displayed enhanced and stable SERS activities, colloidal encapsulation by GO has been proven to be an efficient way to prepare a SERS substrate with long-term stability for practical applications.

Graphical abstract: Graphene oxide wrapped individual silver nanocomposites with improved stability for surface-enhanced Raman scattering

Supplementary files

Article information

Article type
Paper
Submitted
04 May 2015
Accepted
18 Jun 2015
First published
18 Jun 2015

RSC Adv., 2015,5, 55801-55807

Graphene oxide wrapped individual silver nanocomposites with improved stability for surface-enhanced Raman scattering

N. Gao, T. Yang, T. Liu, Y. Zou and J. Jiang, RSC Adv., 2015, 5, 55801 DOI: 10.1039/C5RA08180G

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