Enhancing Non-linear Response of Fullerene via Incorporation of Gold Nanoparticles
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Bi-functional nanocomposite thin films of fullerene C60 and C70 containing Au NPs were synthesized using thermal co-evaporation method. Different atomic concentrations of Au metal varying from 5 to 35 at.% was chosen to get the Au NPs with different sizes in fullerene matrix. The thickness of films and metal concentration is confirmed by Rutherford backscattering spectroscopy (RBS). UV-visible spectrum shows the excitation of SPR band in all samples except for the lowest metal concentration which is ~ 5 at.% and SPR is red shifted with increasing concentration of Au. The shift in SPR position with increasing metal concentration for both Au-C60 and Au-C70 is nearly linear. X-ray diffraction spectroscopy indicates the formation of bigger size particles with increasing metal concentration in both the cases of Au-C60 and Au-C70, which is further confirmed by transmission electron microscopy results. Au-C60 and Au-C70 (could) be interesting nanocomposites for surface-enhanced Raman scattering studies.
KeywordsNanoparticles Surface-enhanced Raman spectroscopy Surface plasmon resonance Optical properties
The authors are thankful to Materials Research Centre (MRC), MNIT, Jaipur, for providing experimental characterization facilities.
R. Singhal and J. Bhardwaj are also thankful to CSIR New Delhi (Ref: 03(1408)/17/EMR-II) and DST New Delhi (EMR/2016/005208) for their financial support to carry out the experimental research work.
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