Electronic excitation induced tuning of surface plasmon resonance of Ag nanoparticles in fullerene C<sub>70</sub> matrix
Singhal, R; Agarwal, D C; Mishra, Y K; Singh, F; Pivin, J C; Chandra, R; Avasthi, D K; Singhal, R; Inter University Accelerator Centre, Post Box No. 10502, New Delhi 110067, India;; Agarwal, D C; Inter University Accelerator Centre, Post Box No. 10502, New Delhi 110067, India; Mishra, Y K; Functional Nanomaterials, Institute for Materials Science Christian-Albrechts-University Kaiserstraße 2, 24143 Kiel, Germany; Singh, F; Inter University Accelerator Centre, Post Box No. 10502, New Delhi 110067, India; Pivin, J C; CSNSM, IN2P3-CNRS, Batiment 108, F-91405 Orsay Campus, France; Chandra, R; Institute Instrumentation Centre, Indian Institute of Technology Roorkee, Roorkee 247667, India; Avasthi, D K; Inter University Accelerator Centre, Post Box No. 10502, New Delhi 110067, India
Журнал:
Journal of Physics D: Applied Physics
Дата:
2009-08-07
Аннотация:
We report the electronic excitation induced controlled tuning of the surface plasmon resonance (SPR) wavelength of Ag nanoparticles (NPs) in fullerene C<sub>70</sub> matrix. The transformation of fullerene C<sub>70</sub> into amorphous carbon (a:C) under ion irradiation is used to tune the SPR wavelength of C<sub>70</sub>–Ag nanocomposite thin films. A 100 nm blue shift was recorded for irradiation at a fluence of 3 × 10<sup>13</sup> ions cm<sup>−2</sup> 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<sub>70</sub> 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.
1.845Мб