Silk fibroin coated CdS quantum dots(SF-CdS QDs) were successfully synthesized in an aqueous system at room temperature under 60Co γ-ray irradiation.The prepared QDs were characterized by transmission electron microscopy(TEM)
energy dispersion spectrometry(EDS)
Fourier transform infrared spectrometer(FT-IR)
X-ray diffraction(XRD)
ultraviolet-visible spectroscopy(UV-vis) and photoluminescence(PL) spectrometry.The synthesized QDs were about 5 nm in diameter with excellent water-solubility.The QDs showed strong visible yellow-green luminescence under UV excitation
at an emission peak of around 538 nm.This method could be conveniently extended to fabricate other nanoparticles coated with silk fibroin.