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Peptide-mediated deposition of nanostructured TiO2 into the periodic structure of diatom biosilica

  • Clayton Jeffryes (a1), Timothy Gutu (a2), Jun Jiao (a2) and Gregory L. Rorrer (a1)

Abstract

Diatoms are single-celled algae that make silica shells called frustules that possess periodic structures ordered at the micro- and nanoscale. Nanostructured titanium dioxide (TiO2) was deposited onto the frustule biosilica of the diatom Pinnularia sp. Poly-l-lysine (PLL) conformally adsorbed onto surface of the frustule biosilica. The condensation of soluble Ti-BALDH to TiO2 by PLL-adsorbed diatom biosilica deposited 1.32 ± 0.17 g TiO2/g SiO2 onto the frustule. The periodic pore array of the diatom frustule served as a template for the deposition of the TiO2 nanoparticles, which completely filled the 200-nm frustule pores and also coated the frustule outer surface. Thermal annealing at 680 °C converted the as-deposited TiO2 to its anatase form with an average nanocrystal size of 19 nm, as verified by x-ray diffraction, electron diffraction, and SEM/TEM. This is the first reported study of directing the peptide-mediated deposition of TiO2 into a hierarchical nanostructure using a biologically fabricated template.

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a)Address all correspondence to this author. e-mail: rorrergl@engr.orst.edu

References

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Peptide-mediated deposition of nanostructured TiO2 into the periodic structure of diatom biosilica

  • Clayton Jeffryes (a1), Timothy Gutu (a2), Jun Jiao (a2) and Gregory L. Rorrer (a1)

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