Formation and properties of selected quantum dots in maize amylopectin matrix

CdS, ZnS, Ga2S3, CaS and Cs2S quantum dots (QDs) were generated in the amylopectin (Ap) matrix. They all emitted a light between 460 (ZnS) and 475 (CdS) nm. Sizes of Ga2S3 and CdS QDs were 7-9 nm and 5-7 nm, respectively. Single ZnS QDs had 6-7 nm but they readily aggregated. The CaS and Cs2S appeared mainly as 30-100 nm aggregates. There were no significant interactions between QDs and the Ap matrix. Presented method appeared unsuitable for the generation of CaS and Cs2S QDs as they as well as their substrates [Ca(NO3)2] hydrolyzed. Calcium compounds formed complexes with Ap and alkaline solution from CsOH could produce cesium salts of Ap as well as cause oxidation of Ap.