Phosphine-free synthesis of CdSe nanocrystals

J. Jasieniak, Craig Bullen, J. Van Embden, P. Mulvaney

Research output: Contribution to journalArticle

209 Citations (Scopus)

Abstract

High quality CdSe nanocrystals have been prepared using elemental selenium as the chalcogenide precursor dispersed in 1-octadecene (ODE). The conditions used to prepare the Se precursor were found to be critical for successful nanocrystal synthesis. Systematic titration of the Se precursor solution with tri-n-octylphosphine (TOP) allowed the Se reactivity to be tuned and the final particle size to be controlled. Band-edge and surface related emission were observed for samples prepared in the presence and absence of added TOP. In the absence of a selenium passivant, the crystal structure of CdSe nanocrystals could be altered from zinc blende to wurtzite by the addition of bis(2,2,4-trimethylpentyl)phosphinic acid (TMPPA).
Original languageEnglish
Pages (from-to)20665-20668
JournalJournal of Physical Chemistry Part B
Volume109
Issue number44
DOIs
Publication statusPublished - 2005

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