12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone
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Low temperature synthesis and characterization of ZnO nanoparticles using Polyvinylpyrrolidone (PVP)

Presented by Ms. Modiehi Amelia TSHABALALA on 13 Jul 2011 from 17:00 to 19:00
Type: Poster Presentation
Session: Poster1
Track: Track A - Condensed Matter Physics and Material Science

Content

<p>ZnO and PVP capped ZnO nanoparticles were synthesised using the sol-gel method at low temperature with ethanol as a solvent, zinc acetate as a precursor and methanol as the cleaning agent. The influence of temperature on the morphology, structure and the optical properties of the ZnO nanoparticles were investigated. The effect of addition different molar masses of the PVP during the synthesis on the ZnO emission peaks was systematically monitored. Polyvinyl pyrrolidone (PVP) is utilized to cap ZnO nanorods from a zinc acetate precursor at low temperature, since the PVP can be easily removed by burning the solid products. The photoluminescence (PL) characterization of the ZnO nanostructures exhibited a broad emission in the visible range with maximum peaks at 449 and/or 530nm, this was influenced by the addition of different molar masses of the PVP. The scanning electron microscopy (SEM) images of ZnO and PVP capped ZnO has showed the presence of the agglomerated ZnO particles which could be due to the agglomeration of the smaller particles. The x-ray diffraction (XRD) spectra for ZnO nanoparticles show the entire peaks corresponding to the various planes of wurtzite ZnO, indicating a single phase. The absorption edges of these ZnO nanoparticles are shifted by additions of PVP polymer. The absorption spectra of the ZnO showed slight shifts with reference to the various molar masses of PVP.

Level (Hons, MSc, PhD, other)?

MSc

Consider for a student award (Yes / No)?

Yes

Short Paper

Yes

Place

Location:
Room: Asteria


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