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
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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