9-13 July 2012
Africa/Johannesburg timezone
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Phonon confinement analysis of carbon doped titanium dioxide quantum dots

Presented by Mr. Taziwa RAYMOND on 10 Jul 2012 from 17:30 to 19:30
Type: Poster Presentation
Session: Poster Session
Track: Track F - Applied Physics

Abstract

Carbon doped titanium dioxide quantum dots have been synthesized by ultrasonic spray pyrolysis technique using titanium tetra ethoxide as the precursor solution. High-resolution transmission electron microscopy on the quantum dots shows difference in lattice spacing in the quantum dot structures prepared to be – 2.02 Å for the ultrasonic spray pyrolysis quantum dots. The most probable particle size is 3.11 nm and the carbon doping only changes the lattice spacings of the TiO2 lattice; the most predominant plane is the (101) in TiO2 reciprocal lattice as determined from the fast Fourier transform of most of the particle images. Raman spectroscopy confirms the TiO2 polymorph to be anatase with the intense phonon frequency at 153 cm-1 blue-shifted from 143 cm-1 due to both carbon doping and particle size. A modified phonon confinement model for quantum dots has been used to extract phonon dispersion and other parameters for anatase.

Award

Yes

Level

PhD

Supervisor

Prof. EL Meyer emeyer@ufh.ac.za, University of Fort Hare

Paper

Yes

Place

Location: IT Building
Room:


Primary authors

  • Mr. Taziwa RAYMOND University of Fort Hare Institute of Technology (FHIT), University of Fort Hare, Private Bag X1314, Alice 5700, Republic of South Africa
  • Prof. Edson MEYER University of Fort Hare Institute of Technology (FHIT), University of Fort Hare, Private Bag X1314, Alice 5700, Republic of South Africa
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Co-authors

  • Dr. Kaumba CHINYAMA University of Fort Hare Institute of Technology (FHIT), University of Fort Hare, Private Bag X1314, Alice 5700, Republic of South Africa
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