Hot-injection synthesis of highly luminescent and monodisperse CdS nanocrystals using thioacetamide and cadmium source with proper reactivity

Journal of Colloid and Interface Science
Lai-Jun ZhangZhen-Hua Liang

Abstract

Thioacetamide (TAA) has served as an excellent sulfur source to react with cadmium stearate to controllably produce highly luminescent and monodisperse CdS nanocrystals through the hot-injection method in dodecylamine solvent. The kinetics and thermodynamics of nucleation/growth of CdS nanocrystals, as well as their optical properties are controlled by changing synthesis conditions such as reaction time, injection/growth temperatures, TAA concentration and cadmium source with different reactivity. Temperature-dependent release of reactive sulfur species from TAA, together with proper reactivity of cadmium source, facilitates the better separation of nucleation and growth stage, the formation of highly monodisperse CdS nanocrystals with tunable size and further self-assembly into ordered superlattices. When cadmium carboxylates such as cadmium stearate and cadmium oleate are used as cadmium sources, surface trap emission of CdS nanocrystals can be gradually removed to obtain bright pure-blue emission with increasing reaction time. The highest quantum efficiency of up to 33.6% is achieved when using cadmium stearate as cadmium source at the injection/growth temperatures of 230/210 degrees C for 90min.

References

Oct 19, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Joel van Embden, Paul Mulvaney
Dec 2, 2005·Biomaterials·Fabien PinaudShimon Weiss
Apr 17, 2007·Journal of Colloid and Interface Science·Xing-Can ShenZuo-Yuan Wang
Aug 10, 2007·Biomaterials·Timothy JamiesonAlexander M Seifalian

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Citations

Jun 10, 2010·Analytical and Bioanalytical Chemistry·Megan K WagnerX Chris Le
Nov 3, 2010·Journal of Colloid and Interface Science·Xinmei LiuZhongping Zhang
Dec 17, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Chunlin BaoXiaoping Shen
May 2, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Abhijit BeraBhagavatula L V Prasad

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