Chiral N,N’-disubstituted thioureas as a green sulfur source for the synthesis of highly photoluminescent Cd0.2Zn0.8S quantum dots
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LOGHINA (BEŢ), Liudmila, IAKOVLEVA, Anastasia , CURLAT, Serghei, MAKAEV, Fliur, VLCEK, Miroslav. Chiral N,N’-disubstituted thioureas as a green sulfur source for the synthesis of highly photoluminescent Cd0.2Zn0.8S quantum dots. In: Euro chemistry conference: Exploration of universal hidden and invisible energy through Chemistry, 17-19 iunie 2019, Valencia. Valencia, Spania: University of Cordoba, 2019, p. 37.
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Euro chemistry conference 2019
Conferința "Euro chemistry conference"
Valencia, Spania, 17-19 iunie 2019

Chiral N,N’-disubstituted thioureas as a green sulfur source for the synthesis of highly photoluminescent Cd0.2Zn0.8S quantum dots


Pag. 37-37

Loghina (Beţ) Liudmila1, Iakovleva Anastasia 1, Curlat Serghei2, Makaev Fliur2, Vlcek Miroslav1
 
1 Center of Materials and Nanotechnologies, Faculty of Chemical Technology, University of Pardubice ,
2 Institute of Chemistry
 
Disponibil în IBN: 12 iunie 2020



Teza

Nowadays QDs have been used in different fields such as biological labeling, optoelectronics, photovoltaics,
sensing, and catalysis. There are a variety of approaches to the synthesis of chalcogenide QDs due to the
requirements for the various shape, size and, as consequence, their optical properties.
Unlike the synthesis of previously published sulfur precursors, we present new synthetic possibilities of eco-friendly
disubstituted thioureas for the preparation of Cd0.2Zn0.8S QDs. On the basis of natural sources such as L-valine, L-leucine
and (+)-3-carene, the corresponding β-amino alcohols were obtained and further converted to N,N’-disubstituted
thioureas by reaction with isothiocyanates. Synthesis of Cd0.2Zn0.8S QDs was carried out in an organic dispersion
medium with a non-coordinating solvent 1-octadecene (ODE). A solution of N,N’-disubstituted thiourea in oleylamine
(OAm) was injected to the in situ synthesized cadmium and zinc linoleates at 260 °C in Ar atmosphere. The nucleation
and growth of nanocrystals were monitored by taking aliquots from the reaction mixture. In order to obtain comparable
results during the synthesis of Cd0.2Zn0.8S QDs, the same reaction conditions for each of the N,N’-disubstituted thioureas
were maintained. The structure and composition of the prepared nanopowders were determined by X-ray and EDS
spectroscopy. TEM measurements gave evidence QDs´ shape and size variation due to the influence of various sulfur
precursor chiral fragments nature. The availability of raw materials and simplicity of synthesis can potentially allow
to transfer the laboratory synthesis of highly photoluminescent Cd0.2Zn0.8S QDs (quantum yield up to 60%) into an
industrial scale.
Acknowledgments
Authors appreciate financial support from project “High-sensitive and low-density materials based on polymeric
nanocomposites” – NANOMAT (№ Z.02.1.01/0.0/0.0/17_048/0007376), support from the grants LM2015082 and
ED4.100/11.0251 from the Ministry of Education, Youth and Sports of the Czech Republic and European Regional
Development Fund-Project "Modernization and upgrade of the CEMNAT" (No. CZ.02.1.01/0.0/0.0/16_013/0001829).
Serghei Curlat acknowledges scholarship 51810769 from International Vishegrad Fund.