Preparation of ZnS–CdS Alloy Quantum Dots by Chemical Synthetic Methods and Size-Selective Photoetching Effects on Size Distribution

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Abstract
We have prepared ZnS–CdS alloy (Zn1-x Cd x S) quantum dots (QDs) using chemical synthetic methods and investigated size-selective photoetching effects on the size distribution. The preparation of Zn1-x Cd x S QDs with an alloy composition from x=0 to x=1 is successful using either of the following two methods: a reverse-micelle method using AOT/heptane micellar solutions, and a standard colloidal method in aqueous polyvinyl pyrrolidone solution. Reduction of the size distribution of the colloidal alloy QD to ∼5% was achieved by a size-selective photoetching process. The present results indicate the potential of preparing Zn1-x Cd x S QDs with a narrow size distribution.