Immobilization of Mn-Doped ZnS Quantum Dots on Surface Functionalized Multi-Walled Carbon Nanotubes: Studies on their Optical Properties

Abstract

Manganese-doped ZnS nanocrystals with an amine capping layer have been synthesized and used to decorate MWNTs. FT-IR spectroscopy was employed to characterize the initial changes in surface functionalities. The MWNTs were then acylated with thionyl chloride, and further, the amine capped Mn-doped ZnS semiconductor nanocrystal quantum dots (QDs) were covalently immobilized on the acylated MWNTs. The resulting Mn-doped ZnS QDs and the hybrids with carbon nanotubes were characterized by UV-Vis spectrometer, phosphorescence measurements, and XRD. High resolution TEM and EDX studies were performed to confirm the immobilization of QDs onto the nanotubes.