Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1624502 | Journal of Alloys and Compounds | 2008 | 5 Pages |
Abstract
Manganese-doped CdS nanocrystals have been synthesized by using aqueous solution precipitation method. These samples of CdS:Mn have been subjected to irradiation using C6+ (80Â MeV) under fluence of 1Â ÃÂ 1013 ions/cm2. For characterization X-ray diffraction (XRD), optical absorption, photoluminescence (PL), surface morphology and positron annihilation spectroscopy (PALS) have been performed. The system has been found in hexagonal phase having crystalline size distribution of 18-20Â nm. The PL intensity has been found to be decreased, while optical band gap has been found to be increased of irradiated samples. Positron lifetime component Ï1 (210-183Â ps) is due to annihilation from diffused vacancies on the grain surfaces and Ï2 (399-367Â ps) is due to positrons directly trapped in the vacancy cluster like defects. The third component Ï3 (2453-2064Â ps) is due to annihilation of orthopositronium, at interfaces and boundaries within the nanocrystals.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Balram Tripathi, Y.K. Vijay, F. Singh, D.K. Avasthi, S. Wate,