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	Synthesis, Characterization, and 3D-FDTD Simulation of Ag@SiO2 Nanoparticles for Shell-Isolated Nanoparticle-Enhanced Raman Spectroscopy
	Uzayisenga, Viviane ; Lin, Xiao-Dong ; Li, Li-Mei ; Anema, Jason R. ; Yang, Zhi-Lin ; Yang ZL(杨志林) ; Huang, Yi-Fan ; Lin, Hai-Xin ; Li, Song-Bo ; Li, Jian-Feng ; Tian, Zhong-Qun ; Tian ZQ(田中群)
	2012-06-19
关键词	SILVER NANOPARTICLES TRANSITION-METALS SURFACE SCATTERING GOLD SHINERS NANOSTRUCTURES ULTRATHIN SIZE AG
英文摘要	Au-seed Ag-growth nanoparticles of controllable diameter (50-100 nm), and having an ultrathin SiO2 shell of controllable thickness (2-3 nm), were prepared for shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS). Their morphological, optical, and material properties were characterized; and their potential for use as a versatile Raman signal amplifier was investigated experimentally using pyridine as a probe molecule and theoretically by the three-dimensional finite-difference time-domain (3D-FDTD) method. We show that a SiO2 shell as thin as 2 nm can be synthesized pinhole-free on the Ag surface of a nanoparticle, which then becomes the core. The dielectric SiO2 shell serves to isolate the Raman-signal enhancing core and prevent it from interfering with the system under study. The SiO2 shell also hinders oxidation of the Ag surface and nanoparticle aggregation. It significantly improves the stability and reproducibility of surface-enhanced Raman scattering (SERS) signal intensity, which is essential for SERS applications. Our 3D-FDTD simulations show that Ag-core SHINERS nanoparticles yield at least 2 orders of magnitude greater enhancement than Au-core ones when excited with green light on a smooth Ag surface, and thus add to the versatility of our SHINERS method.; NSF of China [21021002, 21033007]; Innovation Method Fund of China [2010IM040100]
语种	英语
出版者	AMER CHEMICAL SOC
内容类型	期刊论文
源URL	[http://dx.doi.org/10.1021/la3005536]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Uzayisenga, Viviane,Lin, Xiao-Dong,Li, Li-Mei,et al. Synthesis, Characterization, and 3D-FDTD Simulation of Ag@SiO2 Nanoparticles for Shell-Isolated Nanoparticle-Enhanced Raman Spectroscopy[J],2012.
APA	Uzayisenga, Viviane.,Lin, Xiao-Dong.,Li, Li-Mei.,Anema, Jason R..,Yang, Zhi-Lin.,...&田中群.(2012).Synthesis, Characterization, and 3D-FDTD Simulation of Ag@SiO2 Nanoparticles for Shell-Isolated Nanoparticle-Enhanced Raman Spectroscopy..
MLA	Uzayisenga, Viviane,et al."Synthesis, Characterization, and 3D-FDTD Simulation of Ag@SiO2 Nanoparticles for Shell-Isolated Nanoparticle-Enhanced Raman Spectroscopy".(2012).

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