Preparation ZnS Quantum Dots via Water-Phase Synthesis Method

Wei Liu; Xian Lan Chen; Ju Cheng Zhang; Yun Hui Long; Ling Shi; Na Wu

doi:10.4028/www.scientific.net/AMR.706-708.230

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 706-708Preparation ZnS Quantum Dots via Water-Phase...

Preparation ZnS Quantum Dots via Water-Phase Synthesis Method

Abstract:

With water as the medium, PVP as stabilizer and ammonia as complexing agents and adjusting pH value of the solution, we report an all-aqueous synthesis of highly photoluminescent and stable ZnS quantum dots (QDs) by water-phase synthesis reaction between ZnCl2 and NaS at different temperatures and times. The optimal reaction conditions of PVP-capped ZnS QDs were obtained through experiment as follows: the concentration ZnCl2 and NaS solution both are 1 mM, (PVP):(ZnCl2) = 0.0167 (v/v), (NH3):(ZnCl2)=1:300 (v/v), the optimal reaction temperature is 40 °C, the optimal reaction time is 30 min. With ammonia as complexing agents, Zn(OH)2 can dissolve in ammonia and form to complex ions ((Zn(NH3)4)2+), which make Zn2+ release slowly to control the nucleus growth rate of ZnS, thus obtain small size of nanoparticles. The fluorescence spectra shows that the emission peaks of ZnS QDs around ~395 nm and ~470 nm on the emission spectra, which are consistent with literatures, so nano-ZnS QDs was synthesized successfully in this paper.

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Advanced Materials Research (Volumes 706-708)

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230-233

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.706-708.230

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June 2013

Authors:

Wei Liu, Xian Lan Chen, Ju Cheng Zhang, Yun Hui Long, Ling Shi, Na Wu

Keywords:

Fluorescence Spectroscopy, Optimal Reaction Conditions, Water-Phase Synthesis Method, ZnS QDs

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