17 April 2000 Ordered macroporous rutile titanium dioxide by emulsion templating
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Proceedings Volume 3937, Micro- and Nano-photonic Materials and Devices; (2000) https://doi.org/10.1117/12.382813
Event: Symposium on Integrated Optoelectronics, 2000, San Jose, CA, United States
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.
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Vinothan N. Manoharan, Vinothan N. Manoharan, Arnout Imhof, Arnout Imhof, James D. Thorne, James D. Thorne, David J. Pine, David J. Pine, } "Ordered macroporous rutile titanium dioxide by emulsion templating", Proc. SPIE 3937, Micro- and Nano-photonic Materials and Devices, (17 April 2000); doi: 10.1117/12.382813; https://doi.org/10.1117/12.382813
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