Comparison of structural behavior of nanocrystals in randomly packed films and long-range ordered superlattices by time-resolved small angle X-ray scattering

Byeongdu Lee, Paul Podsiadlo, Sara Rupich, Dmitri V. Talapin, Tijana Rajh, Elena V. Shevchenko

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

(Figure Presented) We evaluated the difference between randomly packed NCs (disordered films), periodic films, and three-dimensional crystals in terms of their lattice structure and interparticle spacing using time-resolved small-angle X-ray scattering (SAXS) technique. The work was performed on nanocrystal solids formed by 7 nm PbS nanocrystals capped with oleic acid. We have found that interparticle spacing in faceted three-dimensional crystals is ∼25% smaller as compared with three-dimensional films formed by solvent evaporation. We showed that interparticle spacing in faceted three-dimensional crystals is significantly smaller than the length of a fully extended molecule of oleic acid, and hence, full interdigitation of molecules from neighboring particle is doubtful. Also we demonstrated that postpreparative mild thermal treatment allows further manipulation of interparticle spacing.

Original languageEnglish (US)
Pages (from-to)16386-16388
Number of pages3
JournalJournal of the American Chemical Society
Volume131
Issue number45
DOIs
StatePublished - 2009
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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