4-8 July 2016
Kramer Law building
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=10&confId=86">The Proceedings of SAIP2016</a> published on 24 December 2017

Structural and optical properties of Holmium doped α-Fe<sub>2</sub>O<sub>3</sub> nanoparticles

5 Jul 2016, 15:00
20m
LT1 (Kramer Law building)

LT1

Kramer Law building

UCT Middle Campus Cape Town
Oral Presentation Track A - Division for Physics of Condensed Matter and Materials Division for Physics of Condensed Matter and Materials (1)

Speaker

Ms Langutani Mathevula (Department of Physics, University of South Africa, P. O. Box 392, 0003, south Africa)

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

Yes

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

No

Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

Due to its optical, magnetic, electrical and catalytic properties, iron oxide has attracted attention of researchers from different areas of science. α-Fe2O3 is an environmentally friendly n-type semiconductor with the band gap of ~2.1 eV. It is the most stable iron oxide under ambient conditions. It is widely used in gas sensing, high density magnetic recording media, clinical therapy, Magnetic resonance imaging and diagnosis [1-3]. Rare earth atoms recently have been introduced into the iron oxide matrix which leads to a material that shows multiple interesting effects. Holmium atoms were incorporated into an iron oxide nanoparticle and the concentration of the dopant atom was changed in order to determine its influence on the host crystal.
Un-doped and doped α-Fe2O3 particles were successfully synthesized by sol-gel method using PVA as polymerizing agent. The main advantage of PVA is to provide long stability for nanoparticles and by preventing the particles agglomeration. The synthesized powder was separated and annealed at different temperatures. The shape, size, structural and lumenescence studies of the synthesized powder were characterized by XRD, TEM, FT-IR, UV-Vis and PL spectral techniques. A high crystallinity was observed with increasing annealing temperature by XRD. An increase in absorbance and a red shift was observed with increasing annealing temperature. The estimated band gaps of the powders were found to be 5.5 eV and 2.3 eV for powders at 300°C and 600°C respectively. Un-doped and doped Fe2O3 samples were subjected to radiation from the laser beam source to investigate anti-stokes luminescence.

References
1. M. N Batin and V. Popesca, optoelectronics and advanced materials-rapid communications, Vol. 6, 2012, 727-729

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

PhD

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

Prof M. S Dhlamin, dhlamms@unisa.ac.za, Department of Physics, University of South Africa, P. O. Box 392, 0003

Please indicate whether<br>this abstract may be<br>published online<br>(Yes / No)

yes

Primary author

Ms Langutani Mathevula (Department of Physics, University of South Africa, P. O. Box 392, 0003, south Africa)

Co-author

Prof. Mokhotjwa Dhlamini (Department of Physics, University of South Africa, P. O. Box 392, 0003, south Africa)

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