SYNTHESIS AND CHARACTERIZATION OF CDS NANOCRYSTALS WITH THERMORESPONSIVE POLYMER

This paper reports the synthesis of thermoresponsive colloidal nanocomposites based on CdS and poly(N-isopropylacrylamide) (pNIPAAm). CdS nanocrystals are prepared at room temperature from cadmium chloride and sodium sulfide salts in presence of an organic ligand (3-mercaptopropionic acid) (MPA). As prepared, MPA bound CdS nanocrystals are stable over a month and show good optical properties. The effect of the different ratios of MPA/Cd(2+) and H(2)O/DMF on the resulting particle size of CdS nanocrystals are investigated by UV-Vis absorption measurements. Transmission electron microscopy shows that the particle sizes are about 4 nm, which is in close agreement with the size obtained by UV-Vis spectroscopy.