Evaluate the effect of Thiol-capping agent on optical properties of ZnS QDs synthesized at high temperature

Document Type : Research Article

Authors

1 Faculty of Polymer Engineering & Color Tech., Amirkabir University of Technology, Tehran, Iran/Color and Polymer Research Center (CPRC), Amirkabir University of Technology, Tehran, Iran

2 Color and Polymer Research Center (CPRC), Amirkabir University of Technology,Tehran, Iran

3 Color and Polymer Research Center (CPRC), Amirkabir University of Technology, Tehran, Iran

4 Faculty of Polymer Engineering & Color Tech., Amirkabir University of Technology, Tehran, Iran

/amnc.2016.4.16.7

Abstract

In this paper, ZnS quantum dots were synthesized successfully via an aqueous method at high temperature
(75 °C) in the presence of thioglycolic acid as capping agent. In order to investigate the effect of
TGA concentration on the microstructure and optical properties, X-ray diffraction, infrared spectroscopy,
scanning electron microscopy, UV-Vis and photoluminescence spectra were used. The analysis
showed cubic crystal structure of zinc sulfide nanoparticles and relatively uniform spherical particles
with the crystallite size about 3-4 nm. UV-Visible absorption indicated a well-defined absorption at 320
and 311 nm for uncapped and TGA-capped ZnS which confirmed that quantum confinement effect occurred.
Optical behavior of nanoparticles signified excellent light stability over 180 days. Moreover, the
studies indicated that when the synthesizing performs at high temperature, the concentration of capping
agent should be increased up to 100% to optimize optical properties

Keywords

References

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