期刊
NANO LETTERS
卷 11, 期 10, 页码 4449-4455出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl202689m
关键词
Screw dislocation; nanoplate; crystal growth; zinc hydroxy sulfate; metal hydroxide; gold
类别
资金
- UW-Madison NSEC [NSF DMR 0832760]
- 3M Graduate Research Fellowship
- NSF [DMR-0548232, DMR-1106184]
- Sloan Research Fellowship
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [GRANTS:13798258] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1106184, 0832760] Funding Source: National Science Foundation
We report the dislocation-driven growth of two-dimensional (2D) nanoplates. They are another type of dislocation-driven nanostructure and could find application in energy storage, catalysis, and nanoelectronics. We first focus on nanoplates of zinc hydroxy sulfate (3Zn(OH)(2)center dot ZnSO4 center dot 0.5H(2)O) synthesized from aqueous solutions. Both powder X-ray and electron diffraction confirm the zinc hydroxy sulfate (ZHS) crystal structure as well as their conversion to zinc oxide (ZnO). Scanning electron, atomic force, and transmission electron microscopy reveal the presence of screw dislocations in the ZHS nanoplates. We further demonstrate the generality of this mechanism through the growth of 2D nanoplates of alpha-Co(OH)(2), Ni(OH)(2), and gold that can also follow the dislocation-driven growth mechanism. Finally, we propose a unified scheme general to any crystalline material that explains the growth of nanoplates as well as different dislocation-driven nanomaterial morphologies previously observed through consideration of the relative crystal growth step velocities at the dislocation core versus the outer edges of the growth spiral under various supersaturations.
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