Phase determination of zinc selenide nanocrystals depending on the ligand species of precursor complexes

Takahisa Omata, Hideo Uesugi, Masao Kita

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The two polytypes of ZnSe nanocrystals (NCs), the wurtzite (WZ) and zincblende (ZB) phases, were synthesized in hot organic solutions using zinc acetate as the zinc monomer with oleic acid and oleylamine as ligands. The growth rate, number and size of NCs during the growth stage were evaluated based on the X-ray diffraction profiles, high-resolution transmission electron microscope observations and optical absorption spectra. Experimental results suggested that in these systems, the phase that appeared was not determined during the growth stage but during the nucleation stage. High supersaturation during the nucleation stage resulted in the thermodynamically stable ZB phase, while low supersaturation resulted in the metastable WZ phase. The reason why supersaturation during nucleation determined the phase was discussed on the basis of the size of the critical nucleus influenced by the total free energy change in the system during nucleation.

Original languageEnglish
Pages (from-to)81-88
Number of pages8
JournalJournal of Crystal Growth
Volume394
DOIs
Publication statusPublished - 2014 May 15
Externally publishedYes

Keywords

  • A1: Nanostructures
  • B1: Inorganic compounds
  • B1: Nanomaterials
  • B2: Phosphors
  • B2: Semiconducting II-VI materials

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Phase determination of zinc selenide nanocrystals depending on the ligand species of precursor complexes'. Together they form a unique fingerprint.

Cite this