Optical Properties of Water-Soluble CdTe Quantum Dots Passivated by a Biopolymer Based on Poly((2-dimethylaminoethyl) methacrylate) Grafted onto κ-Carrageenan

Poly ((2-dimethylaminoethyl) methacrylate) grafted onto kappa-carrageenan (kappa C-g-PDMA) as a biopolymer was, synthesized and applied for surface modification of water-soluble CdTe quantum dots (QDs). The effects of DMA concentration, molar ratio of kappa C-g-PDMA/CdTe, reaction temperature and time on optical properties of CdTe QDs were investigated via fluorescent (FL) and UV- visible spectra. The results showed that the kappa C-g-PDMA significantly affects the optical properties of CdTe QDs. The obtained samples were characterized by Fourier transform infrared spectrum (FT-IR), thermogravimetric (TG) analysis, and transmission electron microscopy (TEM). The antibacterial activity, antifungal assays, and cytotoxicity of modified QDs were examined, and a good biocompatibility was observed.