Electrochromic tunable filters based on nanotubes with viologen incorporation

A. Hein; C. Kortz; E. Oesterschulze

doi:10.1117/12.2307158

24 May 2018 Electrochromic tunable filters based on nanotubes with viologen incorporation

A. Hein, C. Kortz, E. Oesterschulze

Proceedings Volume 10679, Optics, Photonics, and Digital Technologies for Imaging Applications V; 106791U (2018) https://doi.org/10.1117/12.2307158
Event: SPIE Photonics Europe, 2018, Strasbourg, France

Abstract

Electrochromic devices offer a wide potential in microoptics applications owing to their compact set-up, low power consumption, and small control voltage. However, the need to use TiO₂ nanoparticle layers (NPL) as efficient electrode material still prevents the development of microstructured optical filters like a tunable optical iris. Here we suggest to replace the TiO₂ NPL by a nanotube TiO₂ electrode obtained by electrochemical anodization of thin microstructured titanium layers. This renders the complete fabrication route of electrochromic filter devices on base of MEMS compatible processes possible. Process control will be addressed as critical issue because extended anodization may cause the delamination of the TiO₂ nanotube film. For the chemisorption of electrochromic viologen molecules a temper process is necessary to turn the nanotube film into the anatase phase. Finally, a fully functional disc shaped tunable intensity filter is presented that relies on the viologen functionalized titania nanotube electrode.

Citation Download Citation

A. Hein, C. Kortz, and E. Oesterschulze "Electrochromic tunable filters based on nanotubes with viologen incorporation", Proc. SPIE 10679, Optics, Photonics, and Digital Technologies for Imaging Applications V, 106791U (24 May 2018); https://doi.org/10.1117/12.2307158

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