Synthesis and characterisation of CdSe QDs by using a chemical solution route
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Date
2020
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Abstract
An efficient synthesis process approach based on a chemical solution route is developed for the cadmium selenide quantum dots (CdSe QDs) that utilise photonic and optoelectronic device manufacturing. The developed route consists of dissolving the cadmium chloride (CdCl2.H2O), 2-mercaptoethanol and sodium selenide anhydrous (Na2SeO3). The different characterisation parameters such as ultraviolet (UV) absorbance, x-ray diffraction (XRD), scanning electron microscopy, energy dispersive x-ray and transmission electron microscopy (TEM) were employed in order to develop the CdSe QDs. When the sample was analysed from the UV–visible studies, the bandgap was about 2.16 eV, whereas the bulk CdSe bandgap was about 1.78 eV. The developed CdSe QDs possessed a cubic crystal structure with crystalline dimensions of about 4.86 nm. Its surface morphology and structure showed the smooth appearance of the surface. The result indicated agglomerated spheres. Ultimately, according to XRD and TEM results, the crystalline dimension was determined in good agreements. © The Institution of Engineering and Technology 2020
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Keywords
Cadmium chloride , Chemicals , Chlorine compounds , Crystal structure , Energy gap , High resolution transmission electron microscopy , II-VI semiconductors , Morphology , Optoelectronic devices , Scanning electron microscopy , Semiconductor quantum dots , Sodium compounds , Surface morphology , X ray diffraction , cadmium chloride , cadmium selenide , mercaptoethanol , quantum dot , 2-mercaptoethanol , Cadmium selenides , Chemical solution route , Cubic crystal structures , Efficient synthesis , Energy dispersive x-ray , Morphology and structures , Sodium-selenide , Article , crystal structure , energy dispersive X ray spectroscopy , morphology , scanning electron microscopy , synthesis , transmission electron microscopy , X ray diffraction , Selenium compounds