University of PardubiceFaculty of Chemical Technology

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Effect of reaction conditions on optical properties of Cd0.1Zn0.9Se0.1S0.9 quantum dots, capped by biologically active ligands

Authors: Loghina Liudmila | Grinco Marina | Iakovleva Anastasia | Šlang Stanislav | Pálka Karel | Vlček Miroslav

Year: 2018

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Effect of reaction conditions on optical properties of Cd0.1Zn0.9Se0.1S0.9 quantum dots, capped by biologically active ligands	Quantum dots (QDs) are one of the first nanomaterials to be integrated with biological science which were used for tracking and imaging of macromolecules in cells. In present, QDs are very attractive in different fields such as biological imaging, optoelectronics, photovoltaics and catalysis [1]. Metal chalcogenide QDs take privileged place among the variety of the colloidal semiconductor QDs, thanks to their quantum confinement effects and size-dependent characteristics. Also, capping a surface of QDs with an organic ligand imparts solubility and stability properties to the particles as well as reduces their aggregation. In this work we present synthesis of highly photoluminescent quaternary Cd0.1Zn0.9Se0.1S0.9 QDs capped by linoleic acid and cysteamine. The previously developed hot-injection method [2] was modified according to the specified conditions. The effect of the ratios between linoleic acid and cadmium and zinc linoleates, as well as the total number of sulfur and selenium precursors taken to the reaction, were studied. By studying the optical properties and structure of the obtained QDs, suitable synthesis conditions were found. Also, the low content of cadmium in desired composition and its low content on the surface of QDs, makes it possible to use these materials for biological labeling and for medical diagnostics. Due to the presence of two non-conjugated double bonds, linoleic acid is an excellent alternative as capping agents to usually used saturated aliphatic acids. This acid could be found in various vegetable oils, and relates to essential fatty acids which are necessary for normal human activity. At the same time, there is a need to obtain both hydrophobic and hydrophilic QDs. Therefore, a research was carried out to replace the hydrophobic ligand with water-soluble cysteamine, which is also a biologically active compound. The structure and optical properties of the obtained QDs have been described and confirmed by different techniques.	Cd-Zn-Se-S; quantum dots; semiconductors; photoluminescence; biologically active compounds