Ultrafast holographic nanopatterning of biocatalytically formed silica

Lawrence L. Brott, Rajesh R. Naik, David J. Pikas, Sean M. Kirkpatrick, David W. Tomlin, Patrick W. Whitlock, Stephen J. Clarson and Morley O. Stone ()
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Lawrence L. Brott: Materials and Manufacturing Directorate, Air Force Research Laboratory, 3005 P Street, Wright-Patterson Air Force Base
Rajesh R. Naik: Materials and Manufacturing Directorate, Air Force Research Laboratory, 3005 P Street, Wright-Patterson Air Force Base
David J. Pikas: Materials and Manufacturing Directorate, Air Force Research Laboratory, 3005 P Street, Wright-Patterson Air Force Base
Sean M. Kirkpatrick: Materials and Manufacturing Directorate, Air Force Research Laboratory, 3005 P Street, Wright-Patterson Air Force Base
David W. Tomlin: Materials and Manufacturing Directorate, Air Force Research Laboratory, 3005 P Street, Wright-Patterson Air Force Base
Patrick W. Whitlock: Materials and Manufacturing Directorate, Air Force Research Laboratory, 3005 P Street, Wright-Patterson Air Force Base
Stephen J. Clarson: University of Cincinnati, 497 Rhodes Hall
Morley O. Stone: Materials and Manufacturing Directorate, Air Force Research Laboratory, 3005 P Street, Wright-Patterson Air Force Base

Nature, 2001, vol. 413, issue 6853, 291-293

Abstract: Abstract Diatoms are of interest to the materials research community because of their ability to create highly complex and intricate silica structures under physiological conditions: what these single-cell organisms accomplish so elegantly in nature requires extreme laboratory conditions to duplicate1,2—this is true for even the simplest of structures. Following the identification of polycationic peptides from the diatom Cylindrotheca fusiformis, simple silica nanospheres can now be synthesized in vitro from silanes at nearly neutral pH and at ambient temperatures and pressures3,4. Here we describe a method for creating a hybrid organic/inorganic ordered nanostructure of silica spheres through the incorporation of a polycationic peptide (derived from the C. fusiformis silaffin-1 protein) into a polymer hologram created by two-photon-induced photopolymerization. When these peptide nanopatterned holographic structures are exposed to a silicic acid, an ordered array of silica nanospheres is deposited onto the clear polymer substrate. These structures exhibit a nearly fifty-fold increase in diffraction efficiency over a comparable polymer hologram without silica. This approach, combining the ease of processability of an organic polymer with the improved mechanical and optical properties of an inorganic material, could be of practical use for the fabrication of photonic devices.

Date: 2001
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DOI: 10.1038/35095031

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