Melting of Zn nanoparticles embedded in SiO2 at high temperatures: Effects on surface plasmon resonances

Amekura, H.; Tanaka, M.; Katsuya, Y.; Yoshikawa, H.; Shinotsuka, H.; Tanuma, S.; Ohnuma, M.; Matsushita, Y.; Kobayashi, K.; Buchal, Ch.; Mantl, S.; Kishimoto, N.
January 2010
Applied Physics Letters;1/11/2010, Vol. 96 Issue 2, p023110
Academic Journal
Zn nanoparticles at room temperature show two absorption peaks in the near-infrared (NIR) and the ultraviolet (UV) regions, both of which satisfy the criterion of surface plasmon resonance (SPR). From x-ray diffraction at high temperatures, it was found that the Zn nanoparticles in SiO2 melt at 360–420 °C and solidify at 250–310 °C with a large temperature hysteresis. While the NIR peak disappears with melting, the UV peak shows sudden energy shift with melting but survives even after the melting. The first-principle band calculation ascribes the UV and NIR peaks to SPR-enhanced inter- and intraband transitions, respectively.


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