Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 42, Issue 15, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/42/15/155103
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Funding
- University Grant Commission, New Delhi
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We report the electronic excitation induced controlled tuning of the surface plasmon resonance (SPR) wavelength of Ag nanoparticles (NPs) in fullerene C-70 matrix. The transformation of fullerene C-70 into amorphous carbon (a:C) under ion irradiation is used to tune the SPR wavelength of C-70-Ag nanocomposite thin films. A 100 nm blue shift was recorded for irradiation at a fluence of 3 x 1013 ions cm(-2) by 120 MeV Ag ions. A growth of Ag NPs from 7.0 +/- 0.8 to 11.0 +/- 0.4 nm with increasing fluence was observed by transmission electron microscopy and it is explained in the framework of thermal spike model. The transformation of fullerene C-70 into amorphous carbon with ion irradiation was confirmed by Raman spectroscopy. This work demonstrates the possibility to locally excite the SPR at a desired wavelength and therefore, acquiring multiple SPR bands at a single substrate which could be useful in developing more efficient optical sensors.
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