Au@Ag Core-Shell Nanocubes with Finely Tuned and Well-Controlled Sizes, Shell Thicknesses, and Optical Properties

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	Au@Ag Core-Shell Nanocubes with Finely Tuned and Well-Controlled Sizes, Shell Thicknesses, and Optical Properties
	Ma, YY ; Li, WY ; Cho, EC ; Li, ZY ; Yu, TK ; Zeng, J ; Xie, ZX ; Xia, YN
刊名	ACS NANO
	2010
卷号	4 期号:11 页码:6725
关键词	POLYHEDRAL GOLD NANOCRYSTALS SHAPE-CONTROLLED SYNTHESIS FACILE SYNTHESIS METAL NANOSTRUCTURES SILVER NANOCRYSTALS SELECTIVE SYNTHESIS AQUEOUS-SOLUTION NANOPARTICLES REDUCTION NANORODS
ISSN号	1936-0851
通讯作者	Xia, YN: Washington Univ, Dept Biomed Engn, St Louis, MO 63130 USA.
中文摘要	This paper describes a facile method for generating Au@Ag core-shell nanocubes with edge lengths controllable in the range of 13 4-50nm. The synthesis involved the use of single-crystal, spherical Au nanocrystals of 11 nm in size as the seeds in an aqueous system, with ascorbic acid serving as the reductant and cetyltrimethylammonium chloride(CTAC) as the capping agent. The thickness of the Ag shells could be finely tuned from 1 2 to 20 nm by varying the ratio of AgNO(3) precursor to Au seeds We also investigated growth mechanism by examining the effects of seeds (capped by CTAC or cetyltrimethylammonium bromide (CTAB)) and capping agent (CTAC vs CTAB) on both size and shape of the resultant core-shell nanocrystals. Our results clearly indicate that CTAC worked much better than CTAB as a capping agent in both the syntheses of Au Seeds and Au@Ag core-shell nanocubes. We further studied the localized surface plasmon resonance properties of the Au@Ag nanocubes as a function of the Ag shell thickness By comparing with the extinction spectra obtained from theoretical calculations, we derived a critical value of ca 3 nm for the shell thickness at which the plasmon excitation of the Au cores would completely screened by the Ag shells. Moreover these Au@Ag core-shell nanocubes could be converted into Au-based hollow nanostructures containing the original Au seeds in the interiors through a galvanic replacement reaction.
收录类别	SCI
资助信息	NSF [DMR 0804088, ECS 0335765]; NIH [1R01 CA138527]; Ministry of Education Science and Technology [R32 20031]; China Scholarship Council
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/34072]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Ma, YY,Li, WY,Cho, EC,et al. Au@Ag Core-Shell Nanocubes with Finely Tuned and Well-Controlled Sizes, Shell Thicknesses, and Optical Properties[J]. ACS NANO,2010,4(11):6725.
APA	Ma, YY.,Li, WY.,Cho, EC.,Li, ZY.,Yu, TK.,...&Xia, YN.(2010).Au@Ag Core-Shell Nanocubes with Finely Tuned and Well-Controlled Sizes, Shell Thicknesses, and Optical Properties.ACS NANO,4(11),6725.
MLA	Ma, YY,et al."Au@Ag Core-Shell Nanocubes with Finely Tuned and Well-Controlled Sizes, Shell Thicknesses, and Optical Properties".ACS NANO 4.11(2010):6725.