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- Title
Effect of Order of Reagents Addition on Optical and Structural Properties of CdS Quantum Dot Prepared by Chemical Bath Deposition Technique.
- Authors
Nwabue, F. I.; Oroke, E. C.; Onah, D. U.; Nworie, F. S.; Ikelle, I. I.
- Abstract
Cadmium sulfide quantum dots were synthesized and deposited on glass substrates by chemical bath deposition (CBD) technique using cadmium sulfate and thiourea solutions in the presence of a 4,4’-(1,2-ethanediyldinitrilo)bis-(2-pentanone) (EDDBP) tetradentate ligand as a complexing agent. The order of reagents addition was varied to deposit films that were characterized for their surface morphological, optical, structural, and solid-state properties using a scanning electron microscope (SEM), a UV-visible spectrophotometer, an X-ray diffractometer (XRD), and Brunauer-Emmet-Teller (BET) analyses. The optimal condition for film deposition using the normal sequence of reagents addition was found at pH 8-12 and 298-353 ± 1K and gave films of 2.40-321.06 nm thickness, while the variation in the order of reagents addition gave improvements in the film properties. The optical properties and the observed direct band gaps (1.75-3.16 eV) of the films suggest usage in electroluminescent and solar cell devices since they have a first-order transition. The XRD patterns of the quantum dots indicated hexagonal wurzite structures, while the BET confirmed their mesoporous and nanonature.
- Subjects
QUANTUM dots; CHEMICAL solution deposition; OPTICAL properties; BAND gaps; SCANNING electron microscopes; CADMIUM sulfide
- Publication
Iraqi Journal of Science, 2024, Vol 65, Issue 3, p1172
- ISSN
0067-2904
- Publication type
Article
- DOI
10.24996/ijs.2024.65.3.1