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Engineering of hydrophilic and plasmonic properties of Ag thin film by atom beam irradiation
Authors:Udai B. Singh  D.C. AgarwalS.A. Khan  Manish KumarA. Tripathi  R. SinghalB.K. Panigrahi  D.K. Avasthi
Affiliation:a Inter-University Accelerator Centre, Aruna Asaf Ali Marg, Post Box - 10502, New Delhi, 110 067, India
b Material Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, Tamilnadu, India
Abstract:
Hydrophilic Ag nanostructures were synthesized by physical vapour deposition of 5 nm Ag thin films followed by irradiation with 1.5 keV Ar atoms. Optical absorbance measurements show a characteristic surface plasmon resonance absorption band in visible region. A blue-shift in absorbance from 532 to 450 nm is observed with increasing fluence from 1 × 1016 to 3 × 1016 atoms/cm2. Atomic force microscopy was performed for the pristine and irradiated samples to study the surface morphology. The atom beam irradiation induced sputtering and surface diffusion lead to the formation of plasmonic surface. Rutherford backscattering spectroscopy of the pristine and irradiated film indicates that metal content in the film decreases with ion fluence, which is attributed to the sputtering of Ag by Ar atoms. The contact angle measurement demonstrates the possibility of engineering the hydrophilicity by atom beam irradiation.
Keywords:Hydrophilic property   Surface plasmon resonance   Power spectral density   Contact angle   Rutherford backscattering spectroscopy
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