Emergence of New Collective Properties of Cobalt Nanocrystals Ordered in fcc Supracrystals: I, Structural Investigation

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• 作者：Isabelle Lisiecki ; Caroline Salzemann ; Dinah Parker ; Pierre-Antoine Albouy ; Marie-Paule Pileni
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：August 30, 2007
• 年：2007
• 卷：111
• 期：34
• 页码：12625 - 12631
• 全文大小：955K
• 年卷期：v.111,no.34(August 30, 2007)
• ISSN：1932-7455

文摘

As is now well-established, metallic nanocrystals with very low size distribution self-organize into long-range ordered three dimensional (3D) superlattices. Here, we report the annealing induced atomic phasetransition of Co nanocrystals, arranged in long-range ordered fcc supracrystal 3D assemblies, from a poorlycrystallized fcc structure to hcp monocrystals. We stress that this transition takes place at the atomic scaleand that the fcc suprastructure of the superlattice remains unchanged. In addition, neither coalescence betweennanocrystals nor oxidation of the Co material is observed. In fact, improvement in the long-range fcc orderof the supracrystals is found. To our knowledge, this is the first report of the fabrication of long-range fccsupracrystals made with hcp Co nanocrystal building blocks.