Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 132, Issue 45, Pages 15866-15868Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja105132u
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Funding
- NSF [DMR-0847535]
- Chicago Energy Initiative
- U.S. Department of Energy [DE-AC02-06CH11357]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0847535] Funding Source: National Science Foundation
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We show that the length of the alkyl chain of surface ligands can shift the equilibrium between the wurtzite and zinc blende polytypes of CdSe nanocrystals. In-situ wide-angle X-ray scattering measurements reveal that short-chain (e.g., propyl) phosphonic acids stabilize CdSe nanocrystals with the zinc blende phase whereas octadecylphosphonic acid stabilize nanocrystals with the wurtzite phase. We also demonstrate how this effect can be used to improve the shape selectivity in the synthesis of anisotropic CdSe/CdS and ZnSe/CdS nanoheterostructures.
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