Synthesis of water-soluble core/shell CdS/ZnS nanoparticles at room temperature under ultrasonic irradiation: Potential for human serum detection

Water soluble semiconductor nanoparticles (NPs) of CdS are prepared at room temperature (~295 K) and under short time ultrasonic irradiation. We present the effect of ultrasonic irradiation on the formation of CdS NPs, and the data is explained by a growth law. It is found that the growth is governed by surface diffusion at the solid–liquid interface. CdS NPs are easily coated with relatively wide bandgap semiconductor ZnS. The interaction of core/shell CdS/ZnS NPs with a different amount of lyophilisates of human serum is studied by means of the absorption spectrum and zeta potential.