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Surface Plasmon Resonance of Silver Nanoparticles on Vanadium Dioxide

2006; American Chemical Society; Volume: 110; Issue: 5 Linguagem: Inglês

10.1021/jp055744j

1520-6106

Gang Xu, Yong Chen, Masato Tazawa, Ping Jin,

Transition Metal Oxide Nanomaterials

The localized surface plasmon resonance (SPR) spectrum of silver nanoparticles fabricated on a thermochromatic film, vanadium dioxide (VO2), is studied in this paper. Owing to the temperature-dependent dielectric function of VO2, the SPR band dramatically exhibits temperature dependence in the range of 30−80 °C. The peak extinction wavelength, λSPR, blueshifts as temperature increases and reversibly redshifts as temperature decreases. The shift magnitude (ΔλSPR) is strongly dependent on the silver mass thickness, dm; a value of 50 nm of ΔλSPR is achieved for particles (mean diameter 51 nm) with dm = 2 nm while a value of 250 nm is achieved for particles (mean diameter 133 nm) with dm = 10 nm. Beyond the SPR band, it is interesting to find that the spectral line shape of silver particles is dominated by the imaginary part of the dielectric function of VO2. These results can be interpreted based on dynamical Maxwell−Garnett theory.