Ordered macroporous rutile titanium dioxide by emulsion templating

Vinothan N. Manoharan, Arnout Imhof, James D. Thorne, David J. Pine

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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 (n≈2.9) as opposed to the low-index anatase phase (n≈2.4). We make these materials by a sol-gel process with oil-in-formamide emulsions as templates. The emulsion droplets are stable and have a polydispersity of 15% 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 °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.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSociety of Photo-Optical Instrumentation Engineers
Number of pages7
StatePublished - 2000
EventMicro- and Nano-Photonic Materials and Devices - San Jose, CA, USA
Duration: Jan 27 2000Jan 28 2000


OtherMicro- and Nano-Photonic Materials and Devices
CitySan Jose, CA, USA

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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