Abstract
We demonstrate a new method for preparing metal sulfide nanocrystals using alkyl thiolsas a sulfur precursor. Alkyl thiols have many advantages for practical synthesis becausethey are miscible with most organic solvents and very stable under an air atmosphere. CdSnanocrystals were made with CdO and thiols with different alkyl chains such asn-octanethiol and octadecanethiol. They exhibited uniform size, highly crystalline structureand a sharp photoluminescence spectrum. Also, CdSe/CdS core/shell nanocrystals canbe prepared by single injection of a mixture consisting of alkyl thiol and Se intrioctylphosphine to a Cd precursor. A reaction scheme is proposed as alkyl thiols reactwith the metal precursor to form stable metal thiolate intermediates during the initialperiod of reaction, and the thiolate decomposes slowly to form homogeneousnuclei.
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