7-11 July 2014
Africa/Johannesburg timezone
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Optical, ESR and surface state XPS investigation in 0D ZnO nanostructures doped with rare earth ions

Presented by Mr. Guy Leba KABONGO on 8 Jul 2014 from 17:10 to 19:00
Type: Poster Presentation
Session: Poster1
Track: Track A - Division for Physics of Condensed Matter and Materials
Board #: A.401

Abstract

We report on the (micro)-structural, optical, morphological, surface state and magnetic characteristics of un-doped and rare earth (RE) doped zinc oxide (ZnO) 0-dimension (0D) semiconductor nanostructures, which were successfully synthesized via a facile sol-gel process. The optical investigation of as-synthesized samples as revealed by optical absorption spectroscopy showed a blue shift of the absorption band-edge as compared to the bulk material, which could be an effective indication of quantum confinement effect. From the transmission electron microscopy (TEM) results, it was observed a morphological change as the dopant concentration was increased probably due to the Ostwald ripening effect; furthermore, the highly crystalline nature of the synthesized 0D nanostructures was confirmed. Finally, defects state in the semiconductor nanostructures was studied using photoluminescence (PL) spectroscopy, x-ray photoelectron spectroscopy (XPS) and Electron Spin resonance (ESR).

Award

Yes

Level

MSc

Supervisor

Mokhotjwa Simon Dhalamini,dhlamini@unisa.ac.za,UNISA

Paper

Yes

Place

Room: D Ring ground level


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