Document Detail

Comparing the Structural Stability of PbS Nanocrystals Assembled in fcc and bcc Superlattice Allotropes.
MedLine Citation:
PMID:  22702237     Owner:  NLM     Status:  Publisher    
We investigated the structural stability of colloidal PbS nanocrystals (NCs) self-assembled into superlattice (SL) allotropes of either face-centered cubic (fcc) or body-centered cubic (bcc) symmetry. Small angle-X-ray scattering (SAXS) analysis showed that NCs are packed more densely in the bcc than in fcc SL, which illustrates the relationship between the cuboctahedra shape of the particle to the structure of the SL. Using the high-pressure rock salt/orthorhombic phase transition as a stability indicator, we discovered that the transition pressure for NC in a bcc SL occurs at 8.5 GPa; which is 1.3 GPa higher than the transition pressure (7.2 GPa) observed for a fcc SL. The improved structural stability is attributed primarily to the effective absorption of loading force in specific SL symmetry and to a lesser extent to the surface energy of the NC. The experimental results provide new insights into the fundamental relationship between the symmetry of the self-assembled SL and the structural stability of the constituent NCs.
Kaifu Bian; Zhongwu Wang; Tobias Hanrath
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-6-16
Journal Detail:
Title:  Journal of the American Chemical Society     Volume:  -     ISSN:  1520-5126     ISO Abbreviation:  -     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-6-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503056     Medline TA:  J Am Chem Soc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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