Peptide-mediated Deposition Of Nanostructured Tio_2 Into The Periodic Structure Of Diatom Biosilica

摘要

Diatoms are single-celled algae that make silica shells called frustules that possess periodic structures ordered at the micro- and nanoscale. Nanostructured titanium dioxide (TiO_2) 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 TiO_2 by PLL-adsorbed diatom biosilica deposited 1.32 ± 0.17 g TiO_2/g SiO_2 onto the frustule. The periodic pore array of the diatom frustule served as a template for the deposition of the TiO_2 nanoparticles, which completely filled the 200-nm frustule pores and also coated the frustule outer surface. Thermal annealing at 680 ℃ converted the as-deposited TiO_2 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 TiO_2 into a hierarchical nanostructure using a biologically fabricated template.