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@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.
Department of Bioscience and Biotechnology, Konkuk University, Seoul 143-701, Korea. phamricky@gmail.com.
Xuan-Hung
XH
Pham
Department of Bioscience and Biotechnology, Konkuk University, Seoul 143-701, Korea. dkhei0525@hanmail.net.
Eunil
E
Hahm
Department of Bioscience and Biotechnology, Konkuk University, Seoul 143-701, Korea. hmkim0109@konkuk.ac.kr.
Hyung-Mo
HM
Kim
Department of Bioscience and Biotechnology, Konkuk University, Seoul 143-701, Korea. sb201473049@konkuk.ac.kr.
Seongbo
S
Shim
Department of Bioscience and Biotechnology, Konkuk University, Seoul 143-701, Korea. kth890304@naver.com.
Tae Han
TH
Kim
Department of Chemistry Education, Seoul National University, Seoul 151-742, Korea. jeongdh@snu.ac.kr.
Dae Hong
DH
Jeong
School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Korea. yslee@snu.ac.kr.
Yoon-Sik
YS
Lee
Department of Bioscience and Biotechnology, Konkuk University, Seoul 143-701, Korea. bjun@konkuk.ac.kr.
Bong-Hyun
BH
Jun
graphene oxide; signal enhancement; silica coating; surface-enhanced Raman scattering (SERS)