Optical and electron spin resonance studies of coprecipitated Cd_1-xCu_xS (x = 0-0.15) semiconductor nanoparticles capped with thiophenol

摘要

Nanoparticles ofCd_1-xCu_xS (x = 0-0.15) were synthesized by chemical coprecipitation using thiophenol as a capping agent. The x-ray diffraction patterns reveal that the pure and doped CdS nanoparticles are single phase with cubic zinc blende structure. The transmission electron microscopy shows the average size of the nanoparticles is about 8.5 nm. Optical absorption spectra indicate the energy gap decreases with increasing Cu~2+ concentration. The broad emission peak around 520 nm is completely quenched with increasing Cu + content. The electron spin resonance analysis also confirms the Cu (II) ion to be doped substitutionally in CdS nanoparticles and the Lande factor of all the samples with sharp resonance is g = 2.0.