Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8161058 | Physica B: Condensed Matter | 2018 | 7 Pages |
Abstract
We present L-cysteine capped CdOXTe1âX and CdTeXSe1âX nanoparticles (NPs) prepared in one pot. The as-prepared CdOXTe1âX NPs were found to have a hexagonal crystal structure of CdTe with a cubic phase of CdO. There was, however, change in phase to cubic type when 2Â mM of Se was introduced into the CdTe at 60Â min of reaction time. The average crystallite sizes obtained from X-ray diffraction analysis for CdOXTe1âX and CdTeXSe1âX NPs were in the range of 10-36Â nm. The diffraction peaks shifted to higher diffraction angle with longer growth time. Scanning electron microscope images display change in shape and size as reaction progress. Photoluminescence (PL) emission was observed to shift from 510-566Â nm and 620-653Â nm for CdOXTe1âX and CdTeXSe1âX NPs respectively followed by variation in the peak intensities. The emission spectra displayed a good symmetry and a narrow full width at half maximum ranging from 41 to 100Â nm in both cases. The absorbance analysis of the as-prepared NPs displayed well-resolved absorption bands. The optical band gaps of the as-prepared NPs were found to decrease with increase in reaction time. Reaction parameters such as pH, reaction time, reaction temperature and the molar concentration could have major effects on the optical properties of the as-prepared nanoparticles hence their need to control them.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Sharon Kiprotich, Martin O. Onani, Francis B. Dejene,