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Resonant photoemission spectroscopy of gamma irradiated VO2 films

Published online by Cambridge University Press:  10 April 2018

I.G. Madiba ,
A. Braun ,
N. Émond ,
M. Chaker ,
S.I. Tadadjeu ,
B.S. Khanyile  and
M. Maaza
I.G. Madiba*
Affiliation:
UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, PO Box 392, Pretoria, South Africa. ETH Zurich, Swiss Federal Institute of Technology CH-8057Zurich, Switzerland iThemba LABS-National Research Foundation, 1 Old Faure Road, Somerset West7129, PO Box722, Somerset West, Western Cape Province, South Africa Empa, Swiss Federal Laboratories Materials Science and Technology, CH-8600 Dübendorf, Switzerland
A. Braun
Affiliation:
Empa, Swiss Federal Laboratories Materials Science and Technology, CH-8600 Dübendorf, Switzerland
N. Émond
Affiliation:
Institut National de la Recherche Scientifique (INRS), 1650Blvd. Lionel-Boulet, Varennes, Québec J3X 1S2, Canada
M. Chaker
Affiliation:
Institut National de la Recherche Scientifique (INRS), 1650Blvd. Lionel-Boulet, Varennes, Québec J3X 1S2, Canada
S.I. Tadadjeu
Affiliation:
Department of Electrical, Electronics and Computer Engineering, French South African Institute of Technology/Cape Peninsula University of Technology, Bellville campus, PO Box 1906, Bellville, 7530, South Africa
B.S. Khanyile
Affiliation:
UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, PO Box 392, Pretoria, South Africa. iThemba LABS-National Research Foundation, 1 Old Faure Road, Somerset West7129, PO Box722, Somerset West, Western Cape Province, South Africa
M. Maaza
Affiliation:
UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, PO Box 392, Pretoria, South Africa. iThemba LABS-National Research Foundation, 1 Old Faure Road, Somerset West7129, PO Box722, Somerset West, Western Cape Province, South Africa
*
*(Email: [email protected])
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Abstract

Vanadium dioxide thin films are considered as smart functional coatings for thermal shielding, and are attractive as a passive thermal shield for spacecrafts. In space they would, however, be subjected to bombardment by interstellar dust particles and electromagnetic radiation. Materials subjected to irradiation will suffer damages induced by the displacement cascades initiated by nuclear reaction. Such cosmic radiation can severely impact the structure and function of materials. To study this effect in the laboratory, we have deposited VO2 films on silicon wafers and exposed them to γ-radiation of doses up to 100 kGy by using a 60Co nuklid source with 1.17 and 1.33 MeV photon energy. We anticipate that the γ-radiation causes local structural perturbations which can amount to defects with a corresponding change in electronic structure and thermal shielding property. We report on the photo emission spectroscopy of gamma irradiated VO2 thin films.

Keywords

radiation effectsmetal-insulator transitionphotoemissionthin film
Type
Articles
Information
MRS Advances , Volume 3 , Issue 42-43: African Materials Research Society 2017 , 2018 , pp. 2499 - 2503
Copyright
Copyright © Materials Research Society 2018 

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