Preparation and Characterization of Water-soluble ZnSe: Fe/ZnSe Quantum Dots

Abstract

Water-soluble Fe-doped ZnSe/ZnSe quantum dots (ZnSe: Fe/ZnSe QDs) were prepared through a facile, low-cost and effective strategy in aqueous solution using L-cysteine ( L-cys) as modifier. X-ray diffraction (XRD) studies showed that the prepared ZnSe: Fe/ZnSe QDs belonged to zinc blende crystal structures. Transmission electron microscopy (TEM) exhibited that the average diameter of ZnSe: Fe/ZnSe QDs was about 2.9 nm. Infrared spectrum (IR) exhibited that the L-cys has been successfully modified to QDs. The tests of Ultraviolet-visible (UV-vis) spectrum exhibited that the absorption edge position of ZnSe: Fe/ZnSe QDs had a sight red shift with the deposition of ZnSe shell. The fluorescence properties of obtained ZnSe: Fe/ZnSe QDs were investigated through photoluminescence (PL) spectrum. The results exhibited that the PL intensity of ZnSe: Fe/ZnSe QDs has been improved obviously compared with ZnSe: Fe QDs.