Abstract
We investigated the effect of energy loss of ions on the ion irradiation-induced tuning of surface plasmon resonance (SPR) wavelength of Au nanoparticles (NPs) in fullerene C70 matrix. The transformation of fullerene C70 into amorphous carbon (a-C) under ion irradiation was used to tune the SPR wavelength of Au–C70 nanocomposite thin films. It is found that the range of tuning of SPR wavelength increases with increase in electronic energy loss of the incoming beam. The growth of Au NPs with increasing fluence was observed in all the cases and total growth is proportional to the electronic energy loss. The average diameter of Au NPs in pristine film is ~4.8 nm and a maximum growth of ~3 nm was observed at a fluence of 3 × 1013 ions/cm2, when the film was irradiated with 120 MeV Ag ions. It was also observed that nuclear energy loss via collision cascades has lower efficiency for SPR tuning in comparison with the electronic excitations.
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Acknowledgments
The author (R. Singhal) is thankful to IUAC Pelletron group for providing stable ion beam. Author is also thankful to Dr. D. Kanjilal and Dr. P. Kumar, IUAC New Delhi for providing low energy ion beam facility (LEIBF). The help and support by Dr. D. Kabiraj, Dr. D. C. Agarwal, Dr. F. Singh, Mr. P. Kulriya of IUAC New Delhi for the synthesis and characterizations of Au-C70 nanocomposite films is highly acknowledged. Department of Science and Technology New Delhi (DST), India is also acknowledged for providing experimental characterization facilities through “Nanomission” and “IRHPA” projects.
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Singhal, R., Pivin, J.C. & Avasthi, D.K. Ion beam irradiation-induced tuning of SPR of Au nanoparticles in fullerene C70 matrix: dependence of energy loss. J Nanopart Res 15, 1641 (2013). https://doi.org/10.1007/s11051-013-1641-2
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DOI: https://doi.org/10.1007/s11051-013-1641-2