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Proceedings Paper

Ordered macroporous rutile titanium dioxide by emulsion templating
Author(s): Vinothan N. Manoharan; Arnout Imhof; James D. Thorne; David J. Pine
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Paper Abstract

We discuss a method for fabricating photonic crystals of closely packed air spheres with diameters on the order of 300 nm in a rutile titania matrix. These differ from the air sphere/titania materials reported elsewhere in that the matrix is the high-index rutile phase of titania as opposed to the low-index anatase phase. We make these material by a sol-gel process with oil-in-formamide emulsions as templates. The emulsion droplets are stable and have a polydispersity of 15 percent or less, allowing them to form small colloidal crystallites when concentrated in a titania sol. The oil template can be removed after gelation of the sol and prior to drying, allowing us to produce monolithic samples with few cracks. Calcination at 1000 degrees C converts the structure to the rutile phase with an average crystallite size of 60 nm. Optical transmission spectra show the presence of a broad minimum at a wavelength of 500 nm for a sample with ordered 200 nm pores.

Paper Details

Date Published: 17 April 2000
PDF: 7 pages
Proc. SPIE 3937, Micro- and Nano-photonic Materials and Devices, (17 April 2000); doi: 10.1117/12.382813
Show Author Affiliations
Vinothan N. Manoharan, Univ. of California/Santa Barbara (United States)
Arnout Imhof, Univ. van Amsterdam (Netherlands)
James D. Thorne, Univ. of California/Santa Barbara (United States)
David J. Pine, Univ. of California/Santa Barbara (United States)

Published in SPIE Proceedings Vol. 3937:
Micro- and Nano-photonic Materials and Devices
Joseph W. Perry; Axel Scherer, Editor(s)

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