Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
Publication date: 16th December 2024
Copper indium sulfide (CIS) QDs present a promising alternative to traditional Pb and Cd based quantum dots [1] due to their low toxicity, photostability, and tunable optical properties. CIS-QDs can crystallize in chalcopyrite or zinc blende-like structures, allowing for compositional tuning and doping, which enhances stability and functionality. Recent efforts have focused on aqueous synthesis using water-soluble stabilizers to improve their colloidal stability and applicability in bioimaging.[2]
Our work involves the hydrothermal synthesis of manganese-doped Cu-In-Zn-S (Mn-CIZS) QDs, which exhibit dual emission from Mn²⁺ (~ms lifetime) and the CIZS host (~μs lifetime). Mn²⁺ emission depends on the host composition and involves an intermediate energy state. Mn-CIZS-QDs also exhibit stable, reversible temperature sensitivity under physiological conditions, making them promising as water-soluble luminescent temperature probes.[3]
The second topic of our work is related to hybrid systems of azobenzene-functionalized CIS QDs. These systems demonstrate quantitative photoisomerization to the (Z)-isomer under UV-visible light (from 365 nm to 533 nm) without back photoisomerization. This unique behavior is attributed to the direct interaction between the (Z)-isomer and CIS QDs, a novel light-induced ligand exchange mechanism, where photoactive azobenzene derivatives repleace ligands on the CIS surface promoting functionalization upon light irradiation.[4]
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