Controllable Silver Plating on Silica for Surface-enhanced Raman Scattering  

作　　者：CHEN Lei HAN Xiao-xia YANG Jing-xiu ZHOU Ji LU Zhi-cheng SONG Wei ZHAO Bing XU Wei-qing OZAKI Yukihiro 

机构地区：[1]State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, P. R. China, [2]Department of Chemistry and Research Center for Single Molecule Spectroscopy, School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan

出　　处：《Chemical Research in Chinese Universities》2011年第4期683-687,共5页高等学校化学研究（英文版）

基　　金：Supported by the National Natural Science Foundation of China(Nos.20873050,20921003,20973074,20903044);the "111" Project(No.B06009);the Key Projects in the National Science & Technology Pillar Program,China(No.2007BAI38B03)

摘　　要：We proposed a facile and rapid method for preparing silica-silver core-shell（SSCS） substrates to use Ag electroless plating on SiO2@Au-seed particles.UV-Vis-NIR absorption spectrometer and SEM were employed to monitor the reaction process of the formation of Ag on the surfaces of silica beads,and the optical resonance of the substrate could shift from visible to NIR region.It has been found that surface-enhanced Raman scattering（SERS） enhancement changes with the electroless plating time and the SSCS substrate with the plating time of 90 s（90SSCS） shows the strongest SERS response under the laser excitation at 514.5 nm.Signals collected over multiple spots and substrate of rhodamine 6G（R6G） resulted in a relative standard deviation（RSD） of 9.75%.The calculated enhancement factor（EF） was approximately 105 ＂106.SSCS substrate exhibits high SERS performance,which is due to electromagnetic SERS enhancement with additional localization field within closely packed Ag nanoparticles decorated on the SiO2 nanoparticles.And this substrate presents tunable and broad localized surface plasmon resonance（LSPR）,so this method may open a new way for SERS studies with other laser excitation.We proposed a facile and rapid method for preparing silica-silver core-shell（SSCS） substrates to use Ag electroless plating on SiO2@Au-seed particles.UV-Vis-NIR absorption spectrometer and SEM were employed to monitor the reaction process of the formation of Ag on the surfaces of silica beads,and the optical resonance of the substrate could shift from visible to NIR region.It has been found that surface-enhanced Raman scattering（SERS） enhancement changes with the electroless plating time and the SSCS substrate with the plating time of 90 s（90SSCS） shows the strongest SERS response under the laser excitation at 514.5 nm.Signals collected over multiple spots and substrate of rhodamine 6G（R6G） resulted in a relative standard deviation（RSD） of 9.75%.The calculated enhancement factor（EF） was approximately 105 ＂106.SSCS substrate exhibits high SERS performance,which is due to electromagnetic SERS enhancement with additional localization field within closely packed Ag nanoparticles decorated on the SiO2 nanoparticles.And this substrate presents tunable and broad localized surface plasmon resonance（LSPR）,so this method may open a new way for SERS studies with other laser excitation.

关 键 词：SiO2 nanoparticle Au seed Ag nanoparticle Surface-enhanced Raman scattering（SERS） 

分 类 号：TN915.1[电子电信—通信与信息系统] O657.37[电子电信—信息与通信工程]