Synthesis of a novel CdS quantum dots coated by poly (acrylic acid) grafted onto starch

Water-soluble, highly fluorescent and very stable biopolymer-conjugated CdS quantum dots (QDs) wereprepared via ligand exchange process of CdS QDs with a biopolymer based on poly (acrylic acid) grafted onto starch(PAA-g-starch). The PAA-g-starch can attach to the surface of CdS QDs to yield quantum dots having great properties.The synthesized samples were studied by transmission electron microscopy (TEM) and it showed that the CdS- PAA-gstarchQDs have an average size of around 4.2 nm which were dispersed in the biopolymer matrix. Fluorescence spectrawere employed to study the optical properties of QDs before and after ligand exchange with PAA-g-starch.

Keywords:

CdS QDs , Water-soluble , optical properties