8-12 July 2013
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=13&confId=32"><font color=#ff0000>SAIP2013 PROCEEDINGS AVAILABLE</font></a>

Effect of zinc acetateconcentrations on the structure, morphology and optical properties of ZnOnanoflakes synthesized by chemical bath deposition method

9 Jul 2013, 17:40
1h
Poster Presentation Track A - Division for Condensed Matter Physics and Materials Poster1

Speaker

Dr JAPPIE DOLO (University of the free state)

Apply to be<br> considered for a student <br> &nbsp; award (Yes / No)?

No

Abstract content <br> &nbsp; (Max 300 words)

FV Molefe,LFKoao, JJ Dolo,BFDejene
Department of Physics, University of the Free State (QwaQwa Campus), Private Bag X13,
Phuthaditjhaba, 9866, South Africa

Corresponding Author Email address: koaolf@qwa.ufs.ac.za

Zinc Oxide (ZnO) nanostructures were synthesized by chemical bath deposition method (CBD)from precursorscontaining varying molar concentrations of zinc acetate. The structure, morphology, optical and luminescence properties of the samples were investigated using X-ray diffraction (XRD), Scanning electron microscopy (SEM), ultraviolet spectroscopy (UV) and Photoluminescence (PL). The XRDresult shows that at low molar concentrations of zinc acetate the structure is modified cubic ZnO.As the molar concentration of zinc acetate increasesthe well-known hexagonal wurtzite structure of ZnOis developed.The average particle size estimated using Scherer’s formula was about 37 nm. It was found that the average particle size increases with an increase in the molar concentration of zinc acetate. SEM observations showed the presence of nanocrystallites forming aggregated nanoflakes. The morphology was found to dependent on the concentration of zinc acetate.The UV-Vis spectra showed that the absorption band edge shift to the higher wavelength with an increase in molar concentration of zinc acetate. The band gap energy of ZnO nanostructures determined from UV reflectance spectra was found to decreasefrom 3.23 to 2.75 eV with an increase in the zinc acetate concentration. The PL results show that the luminescence intensities decrease with an increase in the molar concentration of zinc acetate. The maximum luminesce band was found around 464 nm without any significant shift in position.

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD)?

N/A

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

Yes

Main supervisor (name and email)<br>and his / her institution

LF Koao
dolojj@qwa.ufs.ac.za or koaolf@qwa.ufs.ac.za
University of the Free State

Primary author

Dr JAPPIE DOLO (University of the free state)

Co-authors

Presentation Materials