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SHI induced evolution of surface and wettability of BaF2 thin films

Published online by Cambridge University Press:  08 April 2019

Ratnesh K Pandey*
Department of Physics, School of Engineering, University of Petroleum and Energy Studies, Energy Acres, Bidholi via Premnagar, Dehradun248007, India
Tanuj Kumar
Department of Nanoscience and Materials, Central University of Jammu, Jammu, India
Udai B Singh
Department of Physics, Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur, India
Shikha Awasthi
Department of Physics, M M Mahila Mahavidyalaya, Ara, India
Avinash C Pandey
Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi, India
*Email of the corresponding author:
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We report evolution of the surface and wetting behavior of Barium fluoride (BaF2) thin films under the effect of swift heavy ion (SHI) irradiation at different fluences. The analogy of this study may be used may be used for the development of dust resistant fabric technology for rural area. The ion irradiation has been performed at normal incidence on the films with Au ions having 100 MeV energy. Further, the wettability of irradiated surfaces is studied through contact angle of water droplet. The value of contact angle of droplet changes with irradiation, it increases from 111° to 123° with the increase in fluence from 5×1011 to 1×1013 ions/cm2. The mechanism of wettability of BaF2 is explained on the basis of increase in contact area of water droplet with surface. SHI irradiation deposits a huge amount of energy in materials due to extreme electronic excitation and it causes a large increase in the temperature of material around the ion track. Ion beam irradiation leads to the large ejection of atoms from the surface which is one of the major factors in increasing the roughness of the surface and thus for the change in contact angle.

Copyright © Materials Research Society 2019 

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