Comparison between ligand exchange methods for the quantum dots hydrophilization

摘要

Nowadays semiconductor quantum dots (QDs) is a popular luminescent material for different kinds of bioapplications.Core-shell CdSe/ZnS QDs obtained by the high-temperature synthesis are traditional luminescent nanocrystals with highquantum yield and narrow emission peak. But this type of QDs must be hydrophilized before their use in a water orbiological environment. The goal of our work was the comparison of hydrophilized QDs properties, obtained from oneinitial sample using two different hydrophilization methods. Core-shell type QDs with CdSe/ZnS semiconductorscomposition was synthesized and hydrophilized by two ligand exchange methods: silanization and coating withdihydrolipoic acid (DHLA). Quantum yield, size and colloidal stability of the nanoparticles obtained via both methodswere investigated. The collected data allows making the conclusions about perspectives to use the described methods indifferent bioapplications.