Fast Synthesis of Stable Cubic Copper Nanocages in the Aqueous Phase

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• 作者：Xiaodan Su ; Jingzhe Zhao ; Hari Bala ; Yanchao Zhu ; Ye Gao ; Shanshan Ma ; Zichen Wang
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：October 11, 2007
• 年：2007
• 卷：111
• 期：40
• 页码：14689 - 14693
• 全文大小：570K
• 年卷期：v.111,no.40(October 11, 2007)
• ISSN：1932-7455

文摘

We report here a fast approach to the synthesis of cubic Cu nanocages in higher yield through a wet chemicalreductive procedure. The performing reductive reactions from Cu(II) to Cu(0) in the aqueous phase can befinished in just 3 min at the low temperature of 80 C in the presence of sodium oleate (SOA) as a stabilizer.Both transmission electron microscopy (TEM) and field-emission scanning electron microscopy (FESEM)results indicate that the resultant cubic Cu cages are aggregates of Cu nanoparticles with 200 nm in edgelengths and the inclusive nanoparticles are about 20 nm in size. According to the inspection of the Cunanostructure-forming mechanism, we suggest that the reduction intermediate of roughly solid Cu₂O cubesformed in this strategy served as a spontaneous shape-controlled template and the cubic structure of the Cunanostructures was evolved by morphology heredity from them. As we detected, this cubic morphology ofCu aggregates is preserved at varied reaction times, from 3 min to 2 h; it can be presumed that rapidlyformed copper cubes are stable in morphology both in solution and as powders in restrained reaction time.Experiments in a longer reaction time of 24 h have also been done by us, and the results showed a trend toform Cu hollow spheres in our system at enough reaction time. Reasonably, the cubic Cu cage is a structuremetastable toward hollow spherical materials and it has kinetically controlled growth.