Influence of Liquid Crystal Ligands on the Optical and Monolayer Properties of CdSe Quantum Dots
A. J. Al-Alwani1, E. G. Glukhovskoy2
Abstract
This study investigates the effect of liquid-crystal (LC) ligands on the stability, morphology, and optical behavior of cadmium selenide (CdSe) quantum dots (QDs). Ligand exchange of tri-n-octylphosphine oxide (TOPO)-stabilized CdSe QDs with the nematic liquid crystal 4′-octyl-4-biphenylcarbonitrile (8CB) was carried out. The resulting nanocomposites were characterized by fluorescence spectroscopy and Langmuir–Blodgett (LB) film measurements. The exchange process significantly altered the emission intensity of CdSe QDs and modified the monolayer packing behavior at the air–water interface. LC-stabilized QDs exhibited reduced luminescence compared to oleic acid-capped QDs, with increasing LC concentration leading to further quenching. LB isotherms revealed that LC ligands expanded the monolayer area and influenced phase transitions. These findings highlight the potential of LC ligands to tune the optical and interfacial properties of QDs for applications in optoelectronic devices, sensors, and nanocomposite materials.
Speaker
Al-Alwani Ammar J
Al-Furat Al-Awsat Technical University, Saratov State University
Iraq
Report
File with report
Discussion
Ask question
