SHINERS and plasmonic properties of Au Core SiO2 shell nanoparticles with optimal core size and shell thickness

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	SHINERS and plasmonic properties of Au Core SiO2 shell nanoparticles with optimal core size and shell thickness
	Tian, Xiang-Dong ; Liu, Bi-Ju ; Li, Jian-Feng ; Yang, Zhi-Lin ; Ren, Bin ; Tian, Zhong-Qun ; Yang ZL(杨志林) ; Ren B(任斌) ; Tian ZQ(田中群)
刊名	http://dx.doi.org/10.1002/jrs.4317
	2013
关键词	ENHANCED RAMAN-SPECTROSCOPY METAL NANOPARTICLES SCATTERING SILICA NANOSHELLS PARTICLES ULTRATHIN
英文摘要	National Basic Research Program of China (973 Program) [2009CB930703]; National Science Foundation of China [21033007]; Ministry of Science and Technology of China [2011YQ030124, 2010IM040100]; Shell-isolated nanoparticles (NPs)-enhanced Raman spectroscopy (SHINERS) can be potentially applied to virtually any substrate type and morphology. How to take a step forward to prepare SHINERS NPs (SHINs) with superior performance is critical for the practical applications of surface-enhanced Raman scattering (SERS) in the breadth and depth. Here, we present a method to obtain 120 nm diameter gold NPs coated with ultrathin silica shells (1-4 nm). The silica shell can be controlled growth through carefully tuning a series of parameters, such as amount of 3-aminopropyl triethoxysilane used, pH, reaction time, and reaction temperature. We compare the enhancement factor of the obtained 120 nm Au with a 4 nm silica shell NPs to the 55 nm Au with a 4 nm silica shell NPs, and the activity of a 120 nm SHINs is nearly 24 times that the 55 nm SHIN from a single particle view. We also compare the enhancement factor of 1 nm silica shell Au@SiO2 NPs with the bare Au NPs. The enhancement factor of 1 nm silica shell Au@SiO2 NPs was found to be about twice that of the bare particles. For a deeper understanding of the source of the giant enhanced electrical field of the 1 nm silica shell Au@SiO2 NPs, we study the plasmonic property of single 1 nm silica shell Au@SiO2 NP on a gold film substrate through correlation of the structure of single NP using SEM with its SPR spectroscopy. We find that the multipolar interaction between the single Au@SiO2 NP and gold film substrate is important for the SERS. Our studies on the performance of 120 nm SHINs and the plasmonic property of these particles can significantly expand the applications of SHINERS technique and improve the understanding of physical nature of SHINs. Copyright (c) 2013 John Wiley & Sons, Ltd.
语种	英语
出版者	WILEY-BLACKWELL
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/91886]
专题	物理技术－已发表论文
推荐引用方式 GB/T 7714	Tian, Xiang-Dong,Liu, Bi-Ju,Li, Jian-Feng,et al. SHINERS and plasmonic properties of Au Core SiO2 shell nanoparticles with optimal core size and shell thickness[J]. http://dx.doi.org/10.1002/jrs.4317,2013.
APA	Tian, Xiang-Dong.,Liu, Bi-Ju.,Li, Jian-Feng.,Yang, Zhi-Lin.,Ren, Bin.,...&田中群.(2013).SHINERS and plasmonic properties of Au Core SiO2 shell nanoparticles with optimal core size and shell thickness.http://dx.doi.org/10.1002/jrs.4317.
MLA	Tian, Xiang-Dong,et al."SHINERS and plasmonic properties of Au Core SiO2 shell nanoparticles with optimal core size and shell thickness".http://dx.doi.org/10.1002/jrs.4317 (2013).