2 September 2009 Interface effects in hybrid gold/vanadium dioxide nanostructures
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Gold/vanadium dioxide nanoparticles (NPs) were produced with the intention of creating a hybrid NP retaining the characteristic semiconductor-metal phase transition of VO2 and the plasmonic properties of gold. The fabrication procedure for arrays of the hybrid structure is presented with optical characterization and analysis of the plasmonic structure. The high-temperature anneal required to insure the stoichiometry of the VO2 leads to dewetting of the Au from the underlying VO2 layer, and to dramatic reshaping of the gold NP. Surface enhanced Raman spectroscopy verifies the retention of the VO2 crystalline structure and phase transition; white light extinction measurements exhibit the polarization sensitive plasmonic resonance peaks that characterize the electronic signature of the phase transition. Together these techniques show that the composite system experiences no significant intermingling between the two materials during processing. Furthermore, the controllable nature of the extent of dewetting, via aspect ratio of the pre-annealed particle, suggests that the hybrid system will give insight into interface interactions between the optical and structural properties of the constituents. A second method is suggested to circumvent the annealing effect. The conclusions of our investigation suggest applications as both a thermally or optically tunable plasmonic structure.
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Jed I. Ziegler, Jed I. Ziegler, Joyeeta Nag, Joyeeta Nag, Richard F. Haglund, Richard F. Haglund, "Interface effects in hybrid gold/vanadium dioxide nanostructures", Proc. SPIE 7394, Plasmonics: Metallic Nanostructures and Their Optical Properties VII, 73940Q (2 September 2009); doi: 10.1117/12.826578; https://doi.org/10.1117/12.826578

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