Crystallographic, Energy Gap, Photoluminescence and Photo-Catalytic Investigation of Cu Doped Cd0.9Zn0.1S Nanostructures by Co-precipitation Method

Abstract

The controlled synthesis of Cd 0.9 Zn 0.1 S, Cd 0.89 Zn 0.1 Cu 0.01 S and Cd 0.87 Zn 0.1 Cu 0.03 S nanostructures by simple chemical co-precipitation technique was reported. The XRD investigation con rmed the basic CdS cubic structure on Zn-doped CdS and also Zn, Cu dual doped CdS with no secondary/impurity related phases. No modi cation in cubic structure was detected during the addition of Zn/Cu into CdS. The reduction of crystallite size from 63 Å to 40 Å and the changes in lattice parameter con rmed the incorporation of Cu into Cd 0.9 Zn 0.1 S and generation of Cu related defects. The shift of absorption edge along upper wavelength region and elevated absorption intensity by Cu doping can be accredited to the collective consequence of quantization and the generation of defect associated states. The enhanced optical absorbance and the reduced energy gap recommended that Cd 0.87 Zn 0.1 Cu 0.03 S nanostructure is useful to enhance the e ciency of opto-electronic devices. The presence of Cd-S / Zn-Cd-S /Zn/Cu-Cd-S chemical bonding were con rmed by Fourier transform infrared investigation. The elevated green emissions by Cu incorporation was explained by decrease of crystallite size and creation of more defects.Zn, Cu dual doped CdS nanostructures are recognized as the possible and also e cient photo-catalyst for the removal dyes like methylene blue. The enhanced photo-catalytic behaviour of Zn, Cu dual doped CdS is the collective consequences of high density electron-hole pairs creation, enhanced absorbance in the visible wavelength, surface area enhancement, reduced energy gap and the formation of novel defect associated states. The stability measurement signi ed that Cu doped Cd 0.9 Zn 0.1 S exhibits superior dye removal ability and better stability even after 6 repetitive runs with limited photo-corrosion.

Enhanced Photo-Catalytic and Antibacterial Properties of Ni-Doped Cd0.9Zn0.1S Nanostructures

“…Based on the enhanced optical and emission properties, the Zn, Cr co-doped CdS is suitable for the opto-electronic device applications. The photo-catalytic stability investigation signified that Cu added Cd 0.9 Zn 0.1 S exhibits better dye elimination ability and enhanced stability even after 6 continuous cycles with limited photo-corrosion owing to more charge carriers release, improved surface to volume ratio and formation of more defects [40].…”