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

A hybrid of Ag nanoparticle (NP)-embedded thin silica-coated graphene oxide (GO@SiO(2)@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 hydr...

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Detalles Bibliográficos
Autores principales: Pham, Xuan-Hung, Hahm, Eunil, Kim, Hyung-Mo, Shim, Seongbo, Kim, Tae Han, Jeong, Dae Hong, Lee, Yoon-Sik, Jun, Bong-Hyun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2016
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5245191/
https://www.ncbi.nlm.nih.gov/pubmed/28335304
http://dx.doi.org/10.3390/nano6100176
Descripción
Sumario:A hybrid of Ag nanoparticle (NP)-embedded thin silica-coated graphene oxide (GO@SiO(2)@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@SiO(2)@Ag NPs. The GO@SiO(2)@Ag NPs exhibited a 1.8-fold enhanced Raman signal compared to GO without a silica coating. The GO@SiO(2)@Ag NPs showed a detection limit of 4-mercaptobenzoic acid (4-MBA) at 0.74 μM.

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