CdSe Quantum Dot Growth on Magnetic Nickel Nanoparticles

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• 作者：Wai Ruu Siah ; Alec P. LaGrow ; Moritz J. Banholzer ; Richard D. Tilley
• 刊名：Crystal Growth & Design
• 出版年：2013
• 出版时间：June 5, 2013
• 年：2013
• 卷：13
• 期：6
• 页码：2486-2492
• 全文大小：691K
• 年卷期：v.13,no.6(June 5, 2013)
• ISSN：1528-7505

文摘

This paper reports the formation of Ni鈥揅dSe core鈥搒hell structures. The Ni鈥揅dSe core鈥搒hell structures were synthesized via a seed-mediated growth method where a CdSe shell was grown on preformed nickel core particles. The types of nickel cores include nickel nanocubes of 13 nm in size and spherical nickel nanoparticles of 11 and 45 nm in size. The coating of 37 nm nickel carbide is also included for comparison. The resultant thickness and morphology of the CdSe shell layer varied depending on the size, shape, and composition of the nickel-based core particles used. High-resolution transmission electron microscopy characterization and analysis of the Ni鈥揅dSe interface led to further understanding of the factors governing the growth between these two phases. Optical and magnetic characterizations were also carried out on selected samples. The use of nickel-based cores with different size, shape, and composition allows the thickness and morphology of the CdSe shell layer to be controlled. This led to the changes in the CdSe optical properties.