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[交流] 【讨论】两种新颖的银纳米（微米）结构

http://pubs.acs.org/doi/abs/10.1021/ja903389s

http://muchong.com/bbs/viewthread.php?tid=1235751

In this paper, we report a one-step, high-yield synthesis of one-dimensional Ag heteronanostructures in aqueous solution. Besides the usual fcc phase of Ag, the heteronanostructures also contain a rare hcp (4H polytypic) phase, which favors asymmetrical growth. The rod−needle heteronanostructures (RNHSs) and plate−belt heteronanostructures (PBHSs) are formed through two different mechanisms. For RNHSs, the 4H and fcc phases coexist but have different densities in different segments, while for PBHSs, the fcc and 4H crystal structures exist in plate and belt segments, respectively. Condition-sensitive coexisting phase preferences can be applied as a new way of controlling the shape and thus the properties of Ag nanostructures.

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1楼 2009-08-04 11:13:39

已阅回复此楼关注TA 给TA发消息送TA红花 TA的回帖

phonon6595

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我也不认为这两种结构会有什么独特的性质。所以我没有研究它们的SPR和SERS性质，虽然这对我来说是轻车熟路的事。我觉得合成出别人没合成过的结构本身就是一个重要成就。好在还有审稿人同意我的看法。
Recommendation: Publish in JACS without change.
Comments:
This is an absolutely amazing paper! The authors report on the synthesis of heteronanostructures that have seemingly impossible shapes. Yet, the synthesis offers only one general morphology, as opposed to a mixture of various shapes. This reviewer never thought it would even be possible to prepare such structures (needle-rods or plate-belts) by conventional solution chemistry. The significance here is that the authors demonstrated how the symmetry of fcc metal nanostructures can be broken even further. It is amazing to see that needles, for example, only originate from one end of the hexagonal rods. Even more remarkable are the plate-belt nanostructures where a 1D structure (belt) originates from only one of six nearly identical corners of a hexagonal platelet.

The authors did a great job in characterizing these unique nanostructures and the combination of X-ray, SEM, TEM, and HR TEM is very convincing and gives an opportunity to draw plausible conclusions about the crystal structure(s) and the possible mechanism of formation.

I am sure these findings are going to be of great interest to many readers of JACS and I enthusiastically recommend the publication of this amazing paper in its present form.

Significance: Top 5%

Novelty: Highest (top 5%)

Broad interest: Highest (top 5%)

Scholarly presentation: High

Are the conclusions adequately supported by the data?: Yes

Are the literature references appropriate and correct?: Yes