Preparation Cd-free quantum dots and their optical properties

Abstract

Colloidal semiconductor nanoparticles - quantum dots (QDs) are considered as promising candidates for labelling in - and -biomedical and analytical applications. In recent years, great scientific interest has been focused on triple QDs based on chemical elements of I-III-VI groups, such as CuInS2, CuInSe2, AgInS2, which are less toxic compared to conventional binary QDs based on II-VI groups.
Currently, the most common method for the synthesis of Cd-free QDs in non-polar high-boiling solvents, while the resulting QDs have a high quantum yield and good monodispersity. However, this synthesis in organic solvents is complicated by many-stage procedure, leaving behind a considerable amount of wastes. t In addition, for biological applications, QDs have to be water-soluble and demand suitable functional groups for conjugation with biomolecules in order to add certain specificity. Alternatively method is synthesis QDs directly in water and other polar solvents. However, the aqueous approach limited by the water boiling temperature and optical characteristics the water-soluble QDs still remain inferior to those synthesized in organic solvents. Therefore, more modern and versatile synthesis protocols are still to be developed.
In this work, we have received of water-soluble AgInS/ZnS QDs, analyzed their luminescent properties and the possibilities of analytical application.
The reported study was funded by Ministry of Science and Higher Education of the Russian Federation (project № FSRR-2020-0002).

Speaker

Tatiana S. Ponomaryova
Institute of Chemistry, Saratov State University, Astrakhanskaya 83, 410012 Saratov, Russia
Russian Federation

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