Large Tuning of Surface Plasmon Resonance of Au–Fullerene Nanocomposite
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Gold–fullerene C60 nanocomposite thin films prepared by thermal co-deposition were irradiated by a high energy beam of 120 MeV Ag ions using Pelletron accelerator. Absorption spectra revealed a large and progressive tuning of surface plasmon resonance wavelength when the films were irradiated at higher fluences. This blue shift (~ 119 nm) can be ascribed to the evolution of fullerene into amorphous carbon upon bombardment of high energy ions at higher fluences and causes a shift in refractive index of the matrix. Raman spectra ascertained this transformation with the presence of two bands: D and G band. Ion irradiation also leads to the formation of bigger size Au nanoparticles with well defined spherical shape at higher fluences as confirmed by TEM. XRD results demonstrated decrease in FWHM of diffraction peaks indicating the increase in particle size which is in agreement with the result obtained from TEM analysis.
KeywordsGold nanoparticles Ion irradiation Metal–fullerene nanocomposite Optical properties
The authors are grateful to Pelletron group at IUAC, New Delhi for providing a stable beam. Materials Research Centre (MRC), MNIT, Jaipur is highly acknowledged for providing characterization facilities. R.Singhal and Satakshi Gupta are also thankful to CSIR New Delhi (Ref: 03(1408)/17/EMR-II) and DST New Delhi (EMR/2016/005208) for giving financial support to carry out the experimental research work.
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Conflict of interest
The authors declare that they have no conflict of interest.
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