Quantitative Analysis of the Role Played by Poly(vinylpyrrolidone) in Seed-Mediated Growth of Ag Nanocrystals

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	Quantitative Analysis of the Role Played by Poly(vinylpyrrolidone) in Seed-Mediated Growth of Ag Nanocrystals
	Xia, Xiaohu ; Zeng, Jie ; Oetjen, L. Kyle ; Li, Qingge ; Xia, Younan ; Li QG(李庆阁)
刊名	http://dx.doi.org/10.1021/ja210047e
	2012-01-25
关键词	ENHANCED RAMAN-SCATTERING HIGH-ASPECT-RATIO OPTICAL-PROPERTIES SILVER NANOCRYSTALS METAL NANOPARTICLES OXYGEN-REDUCTION GOLD NANOPARTICLES AU NANOCAGES IN-VIVO SHAPES
英文摘要	NSF [DMR-1104614]; NIH [R01 CA13852701]; Xiamen University; China Scholarship Council; This article presents a quantitative analysis of the role played by poly(vinylpyrrolidone) (PVP) in seed-mediated growth of Ag nanocrystals. Starting from Ag nanocubes encased by {100} facets as the seeds, the resultant nanocrystals could take different shapes depending on the concentration of PVP in the solution. Tithe concentration was above a critical value, the seeds simply grew into larger cubes.still enclosed by.{100} facets. When the concentration fell below a critical value, the seeds would evolve into cuboctahedrons enclosed by a mix of {100} and {111} facets and eventually octahedrons completely covered by {111} facets. We derived the coverage density of PVP on Ag(100) surface by combining the results from two measurements: (i) cubic seeds were followed to grow at a fixed initial concentration of PVP to find out when {111} facets started to appear on the surface, and (ii) cubic seeds were allowed to grow at reduced initial concentrations of PVP to see at which concentration {111} facets started to appear from the very beginning. We could calculate the coverage density of PVP from the differences in PVP concentration and the total surface area of Ag nanocubes between these two samples. The coverage density was found to be 140 and 30 repeating units per nm(2) for PVP of 55 000 and 10 000 g/mol in molecular weight, respectively, for cubic seeds of 40 nm in edge length. These values dropped slightly to 100 and 20 repeating units per nm2, respectively, when 100 nm Ag cubes were used as the seeds.
语种	英语
出版者	J AM CHEM SOC
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/90471]
专题	生命科学－已发表论文
推荐引用方式 GB/T 7714	Xia, Xiaohu,Zeng, Jie,Oetjen, L. Kyle,et al. Quantitative Analysis of the Role Played by Poly(vinylpyrrolidone) in Seed-Mediated Growth of Ag Nanocrystals[J]. http://dx.doi.org/10.1021/ja210047e,2012.
APA	Xia, Xiaohu,Zeng, Jie,Oetjen, L. Kyle,Li, Qingge,Xia, Younan,&李庆阁.(2012).Quantitative Analysis of the Role Played by Poly(vinylpyrrolidone) in Seed-Mediated Growth of Ag Nanocrystals.http://dx.doi.org/10.1021/ja210047e.
MLA	Xia, Xiaohu,et al."Quantitative Analysis of the Role Played by Poly(vinylpyrrolidone) in Seed-Mediated Growth of Ag Nanocrystals".http://dx.doi.org/10.1021/ja210047e (2012).