Slow colloidal growth of PbSe nanocrystals for facile morphology and size control

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We report colloidal growth of PbSe nanosheets and finely size-tuned PbSe nanocrystals (NCs) via simple control of reaction parameters. The approach involves slow injection of precursors with excess amounts of oleic acid. Retarded growth, due to both the slow supply of precursors and the surfeit of oleic acid, causes attachment of PbSe NCs through the (110) planes, which are more reactive than the (100) facet, into a two-dimensional geometry. In contrast, such attachment processes can be prevented by impurities, e.g., Cd chalcogenide (CdSe or CdS) NCs dispersed in chloroform. For instance, the slow injection of Pb and Se precursors into a reaction solution containing Cd chalcogenide NCs results in the growth of spherical PbSe NCs, as the Cd chalcogenide NCs hinder the PbSe nuclei from merging via (110) planes. Compared to conventional rapid-injection methods, PbSe NCs grow slowly, which enables fine control of NC size. Ab initio calculations suggest that Cd precursors strongly bound on the surface of PbSe NCs may impede nanosheet formation and may slow PbSe NC growth.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2014
Language
English
Article Type
Article
Keywords

AUGMENTED-WAVE METHOD; QUANTUM DOTS; ELECTRONIC-STRUCTURE; ORIENTED ATTACHMENT; SEMICONDUCTOR NANOCRYSTALS; CDS NANOCRYSTALS; SHAPE CONTROL; NANOPARTICLES; NANORODS; NANOSTRUCTURES

Citation

RSC ADVANCES, v.4, no.19, pp.9842 - 9850

ISSN
2046-2069
DOI
10.1039/c3ra46875e
URI
http://hdl.handle.net/10203/190202
Appears in Collection
NT-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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