Phase transformations in CdSe quantum dots induced by reaction time

Fehmida K. Kanodarwala*, Fan Wang, Peter J. Reece, John A. Stride

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This paper reports the synthesis of high-quality TOP/TOPO capped CdSe nanocrystals using a simple colloidal method. The effects of varying the reaction time on the size and crystallinity of the synthesized CdSe quantum dots were studied in detail. Powder X-ray diffraction (PXRD) analysis showed a dependence of the crystallite phases as a function of reaction time, from cubic zinc-blende to hexagonal wurtzite and back again to the cubic phase. PXRD data was found to be consistent with high resolution transmission electron microscopy (HRTEM) images of the particles, whilst optical spectroscopy demonstrated the quantum dot nature of the particles. The reaction time-dependent phase behavior is best accounted for by rapid growth along the {111} crystallite facets, after which the facial facets then 'catch-up', resulting once again in cubic symmetry.

Original languageEnglish
Pages (from-to)67-69
Number of pages3
JournalMaterials Letters
Volume141
DOIs
Publication statusPublished - 15 Feb 2015

Keywords

  • Phase transition
  • Quantum dots
  • Reaction time

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