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xuelianpeng金虫 (小有名气)
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中空纳米颗粒制备--Kirkendall Effect
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Kirkendall Effect原来是指两种扩散速率不同的金属在扩散过程中会形成缺陷， Alivisatos利用纳米尺度的Kirkendall Effect在硫化钴的纳米颗粒，该文章发表在2003年的Science杂志上，从此利用此效应制备中空纳米颗粒成为研究的热点 详细请参考 Science 30 April 2004: Vol. 304. no. 5671, pp. 711 - 714 http://dx.doi.org/10.1126/science.1096566 Formation of Hollow Nanocrystals Through the Nanoscale Kirkendall Effect Yadong Yin, Robert M. Rioux, Can K. Erdonmez, Steven Hughes, Gabor A. Somorjai, A. Paul Alivisatos Hollow nanocrystals can be synthesized through a mechanism analogous to the Kirkendall Effect, in which pores form because of the difference in diffusion rates between two components in a diffusion couple. Starting with cobalt nanocrystals, we show that their reaction in solution with oxygen and either sulfur or selenium leads to the formation of hollow nanocrystals of the resulting oxide and chalcogenides. This process provides a general route to the synthesis of hollow nanostructures of a large number of compounds. A simple extension of the process yielded platinum–cobalt oxide yolk-shell nanostructures, which may serve as nanoscale reactors in catalytic applications. [ Last edited by luo.henry on 2008-4-29 at 09:57 ] |
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