Abstract
In this study CdS quantum dots were fabricated by injecting non-equilibrium plasma jet into the aqueous solution including Na2S2O3, CdSO4 and Thioglycolic acid (TGA) in the presence of an ambient gas such as nitrogen and oxygen gases. In order to investigate the structure, morphology, size and chemical nature of the prepared CdS nanocrystals in presence of ambient gas, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS) were employed. The optical properties of CdS nanoparticles were characterized using UV–Vis absorption and photoluminescence (PL) spectroscopies. It was found that the presence of ambient gases especially oxygen, reduces the size and concentration of the synthesized nanoparticles, while the crystalline structure of these nanoparticles is not altered. It was also found that with the increase of flow rate of ambient gas, the PL emission intensity of quantum dots was reduced and the PL peak position as well as the absorption edge undergoes a blue shift.
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