Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)
O 60.84: Poster
Mittwoch, 16. März 2011, 17:30–21:00, P4
Dependence of the photochromic transformation of TiOx- and ZrOx-embedded Ag nanoparticles on the photon energy of the irradiating light — Hendrik Holzapfel1, Alexander Sprafke1, Florian Hallermann1, •Nils Becker1, Melanie Meixner2, Matthias Wuttig1, and Gero von Plessen1 — 1Institute of Physics (IA), RWTH Aachen University, 52056 Aachen, Germany — 2present address: Fraunhofer Institute for Laser Technology ILT, 52074 Aachen, Germany
Photochromic materials change their color under irradiation with light. Uniform TiOx- and ZrOx-embedded Ag nanoparticles with photochromic properties can be fabricated through a combination of nanosphere lithography and electron-beam evaporation. In comparison to the dc-sputter deposition technique as employed in our previous work [1], the good reproducibility of this approach and the less inhomogeneously broadened plasmon line of the resulting samples allow us to analyze the photochromic transformation in a more quantitative way.
In this work, we investigate the dependence of the photochromic transformation of TiOx- and ZrOx-embedded Ag nanoparticles prepared by nanosphere lithography on the photon energy of the irradiating light. We find a photon energy below which no photochromism is observed, almost independently of the embedding medium. Furthermore, the photochromic effect increases with increasing photon energy.
[1] C. Dahmen et al., Appl. Phys. Lett. 88, 011923 (2006)