Blue Luminescent Biogenic Silicon-Germanium Oxide Nanocomposites

Abstract

Marine diatoms are a class of microalgae that possess cell walls composed of silica nanoparticles. These organisms actively assimilate silicic acid Si(OH)4 from seawater, polymerize silicic acid to silica nanoparticles by a protein-mediated precipitation process, then assemble the silica nanoparticles into intricate patterns that constitute the cell wall microarchitecture of the diatom frustule. The biomineralization capacity of marine diatoms, Nitzschia frustulum, was harnessed to biologically manufacture silicon oxide / germanium oxide nanocomposite materials. Germanium was incorporated into living diatom cell mass by a two-stage cultivation process. The micro- and nanostructures of biogenic oxide nanocomposite were characterized by TEM with EDS, and XRD. Furthermore, photoluminescence (PL) measurements were performed on these biogenic nanocomposites with different post processing to study their optoelectronic properties. Strong blue photoluminescence was observed from samples treated with H2O2 and oxygen plasma. A clear blueshift was observed from the biogenic oxides with the addition of germanium. It is believed that self-trapped exciton affected by quantum confinement effect is responsible for the PL from these biogenic oxide nanocomposites.

This is a preview of subscription content, access via your institution.

References

  1. 1

    N. Kröger, R. Duetzmann and M. Sumper, Science, 286, 1129–1132 (1999).

    Article  Google Scholar 

  2. 2

    R. Gordon, F. Sterrenburg and K. Sandhage, Journal of Nanoscience and Nanotechnology, 5, (2005).

  3. 3

    K. Rajeshwar, N.R de Tacconi and C.R. Chenthamarakshan, Chem. Mater. 13, 2765–2782 (2001).

    CAS  Article  Google Scholar 

  4. 4

    G. L. Rorrer, C-H Chang, S-H Liu, C. Jeffryes, J. Jiao and J. A. Hedberg, Journal of Nanoscience and Nanotechnology, 5, 41–49(2005).

    CAS  Article  Google Scholar 

  5. 5

    A.Margaryan and M. A. Piliavin, Germanate Glasses (Artech House, Inc.1993) p.28.

  6. 6

    E. Beniash, J. Aizenberg, L. Addadi and S. Weiner, Proc. R. Soc. Lond. B, 264, 461–465(1997).

    CAS  Article  Google Scholar 

  7. 7

    S. Raz and O. Testeniere, Biol. Bull, 203, 269–274(2002).

    CAS  Article  Google Scholar 

  8. 8

    J. H. Park, D. J. Min and H. S. Song, ISIJ International, 42, 344–351(2002).

    CAS  Article  Google Scholar 

  9. 9

    K.S.A. Butcher, J.M. Ferris and M.R. Philips, Photoluminescence and catholuminescence studies of diatoms – nature’s own nano-porous silica structures, un-published work.

  10. 10

    Y. D. Glinka, Physical Review B, 66, (2002).

Download references

Author information

Affiliations

Authors

Corresponding author

Correspondence to Shuhong Liu.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Liu, S., Jeffryes, C., Rorrer, G.L. et al. Blue Luminescent Biogenic Silicon-Germanium Oxide Nanocomposites. MRS Online Proceedings Library 873, 14 (2005). https://doi.org/10.1557/PROC-873-K1.4

Download citation