Peptide-mediated deposition of nanostructured TiO(2) into the periodic structure of diatom biosilica
(2008) Journal of Materials Research — Vol. 23, n° 12, p. 3255-3262 (2008)
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- 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 (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 degrees C 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.
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Jeffryes, C., Gutu, T., Jiao, J., & Rorrer, G. L. (2008). Peptide-mediated deposition of nanostructured TiO(2) into the periodic structure of diatom biosilica. Journal of Materials Research, 23(12), 3255-3262. https://doi.org/10.1557/jmr.2008.0402 (Original work published 2008)