Synthesis of Sn doped CdS nanoparticles by non-thermal plasma-liquid interactions

Undoped and doped tin (Sn) CdS quantum dots (QDs) were successfully prepared with plasma-liquid interaction (PLI). The synthesized CdS:Sn QDs were characterized by x-ray diffraction (XRD) , transmission electron microscopy, field emission scanning electron microscopy (FESEM), energy dispersive x-ray spectroscopy (EDS), x-ray photoelectron spectroscopy (XPS), and photoluminescence (PL) and UV-vis absorption spectroscopies. XRD patterns of nanoparticles showed that tin incorporation was not disturbed in the hexagonal structure of CdS nanocrystals. The FESEM and TEM images showed that the Sn doped CdS QDs have the spherical shape and their average sizes were about 5 nm, EDS and XPS analysis confirmed the presence of Sn with homogenous distribution in the CdS nanoparticles fabricated by PLI method. The optimal PL intensity was obtained for Sn/Cd 0.75% mole ratio. In this mole concentration, the absorption edge is moved to its maximum red shift comparing with undoped CdS QDs, henceforth absorption spectra is blue shifted.