Ag Nano-composite Glasses Synthesized By Swift Heavy Ion Irradiation

Ranjana S. Varma1*, D.C. Kothari1, S. Santra2, R.G. Thomas2, R. Tewari3, S. Neogy3, C.S. Suchand Sandeep4, Reji Philip4, D. Kanjilal

1Department of Physics & National Centre for Nanosciences and Nanotechnology, University of Mumbai, Vidyanagari, Santacruz East,Mumbai 400 098, India

2Nuclear Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India

3Materials Science Division, Bhabha Atomic Research Centre, Mumbai 400 085, India

4Raman Research Institute, Sadashiva Nagar, Bangalore 560 080, India

5Inter-University Accelerator Centre, Aruna Asaf Ali Marg, Post Box: 10502, New Delhi 110067, India

Adv. Mater. Lett., 2015, 6 (4), pp 348-353

DOI: 10.5185/amlett.2015.5715

Publication Date (Web): Mar 21, 2015

E-mail: ranju16@gmail.com

Abstract


In the present work, we have used swift heavy ions (SHI) irradiation and post irradiation annealing to synthesize Ag nanoparticles in fused silica. Fused silica samples deposited with 15 nm of Ag film were irradiated using SHI beam of 120 MeV Ag9+ ions at different fluences and post irradiation annealing was done at 500 °C in air for 30 min. The samples were characterized using UV-vis absorption spectroscopy, Rutherford Backscattering Spectrometry (RBS), GAXRD, Transmission Electron Microscopy (TEM), and open aperture z-scan measurements. The signature of Ag nanoparticles was observed in optical absorption spectra and the average size of the Ag nanoparticles was estimated using Mie’s theory. The size of the nanoparticles (~3 nm) was also confirmed from the GAXRD and TEM measurements. RBS results for Ag/SiO2 irradiated with the fluence of 5 x1013 ions/cm2 shows the decrease in slope at the interface of the Ag profile, indicating a partial mixing at a fluence of 5 x1013 ions/cm2. Open aperture z-scan measurement of Ag/SiO2 SHI irradiated sample after annealing shows a saturation behavior, indicating that the sample is optically non-linear. The sample shows saturation behavior but does not show optical limiting behavior, which indicates that the size and number density of nanoparticles are low. The ability to control the particle size using ion beam technique as a function of fluence and observed nonlinearity results provide concrete evidence that Ag nano composite glasses can be used in nonlinear and optical limiting application.

Keywords

Ag nanoparticles, swift heavy ion irradiation, RBS, TEM, Z-scan.

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