SAIP 2011 Support
Structure-property relationship of sol-gel synthesised zinc-oxide nanoparticles
Presented by Ms. Natasha Venita PETERSON on 13 Jul 2011 from 17:00 to 19:00
Type: Poster Presentation
Track: Track A - Condensed Matter Physics and Material Science
<p>Zinc-oxide nanoparticles are well known for their novel optical and electronic properties for applications in various fields such as solar cells, ultra violet shielding, gas sensors, paint and heat mirrors. We report on the relation between the structure and optical properties of ZnO nanoparticles synthesized via the sol-gel technique, with specific emphasis on the effect of growth and reaction temperatures. High-resolution microscopy techniques, complemented by Raman spectroscopy and x-ray diffraction, confirm that the crystallinity and particle size of ZnO nanoparticles is directly related to the synthesis conditions. Optical absorption and emission spectroscopy show that optical band gap and photoluminescence of the ZnO nanoparticles are intimately related to its structural properties, ascribed to the quantum confinement effect. Photoluminescence spectroscopy confirm the emission peaks in the ultraviolet (380 nm) and visible (500 nm) region; the latter attributed to the presence of the singly ionized oxygen vacancies in the nanoparticle.
Level (Hons, MSc, PhD, other)?
Consider for a student award (Yes / No)?
- Prof. Christopher ARENDSE University of the Western Cape
- Prof. Thembela HILLIE DST/CSIR National Centre for nano-Structured Materials
- Dr. Mokhotjwa DHLAMINI University of South Africa