SHI induced evolution of surface and wettability of BaF 2 thin films
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.168
SHI induced evolution of surface and wettability of BaF2 thin films Ratnesh K Pandey1,*, Tanuj Kumar2, Udai B Singh3, Shikha Awasthi4, Avinash C Pandey5 1 Department of Physics, School of Engineering, University of Petroleum and Energy Studies, Energy Acres, Bidholi via Premnagar, Dehradun 248007, India
2
Department of Nanoscience and Materials, Central University of Jammu, Jammu, India
3
Department of Physics, Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur, India
4
Department of Physics, M M Mahila Mahavidyalaya, Ara, India
5
Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi, India
*
Email of the corresponding author: [email protected]
Abstract
We report evolution of the surface and wetting behavior of Barium fluoride (BaF 2) 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 5×10 11 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.
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INTRODUCTION: Morphological evolution of solid surfaces under energetic ion bombardment has long been a matter of interest for material scientists for several decades. Energetic ions deposit high energy density per incident ion inside material medium and have the capability of producing such violent processes so as to drive the solid away from equilibrium. Due to which ion irradiation is used as a tool for the creation and tailoring of new materials with novel properties. The behaviour of solid surface during ion beam irradiation is governed either by dynamics of surface roughening occurring due to sputtering or by smoothing induced due to surface diffusion. These two competing processes are responsible for the creation of specific surface features like ripples 1-3 or self-affine nanostructures4. The interaction of keV ions with surfaces results in wellordered patterns, such as ripples or
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