Nanomaterials (Sep 2016)

Silver Nanoparticle-Embedded Thin Silica-Coated Graphene Oxide as an SERS Substrate

  • Xuan-Hung Pham,
  • Eunil Hahm,
  • Hyung-Mo Kim,
  • Seongbo Shim,
  • Tae Han Kim,
  • Dae Hong Jeong,
  • Yoon-Sik Lee,
  • Bong-Hyun Jun

DOI
https://doi.org/10.3390/nano6100176
Journal volume & issue
Vol. 6, no. 10
p. 176

Abstract

Read online

A hybrid of Ag nanoparticle (NP)-embedded thin silica-coated graphene oxide (GO@SiO2@Ag NPs) was prepared as a surface-enhanced Raman scattering (SERS) substrate. A 6 nm layer of silica was successfully coated on the surface of GO by the physical adsorption of sodium silicate, followed by the hydrolysis of 3-mercaptopropyl trimethoxysilane. Ag NPs were introduced onto the thin silica-coated graphene oxide by the reduction of Ag+ to prepare GO@SiO2@Ag NPs. The GO@SiO2@Ag NPs exhibited a 1.8-fold enhanced Raman signal compared to GO without a silica coating. The GO@SiO2@Ag NPs showed a detection limit of 4-mercaptobenzoic acid (4-MBA) at 0.74 μM.

Keywords