Synthesis of Inorganic Nanostructures

Nanoscale science based on one-dimensional structures has found a springboard in the discovery of carbon nanotubes. Since then, many different materials have been produced as one-dimensional (1D) nanostructures, for example nanotubes and nanowires. We investigate novel size- and shape-dependent crystals and the properties of nanoscale materials.

For the production of inorganic nanostructures, we use hydrothermal processes which provide suitable synthetic routes for material preparation under mild conditions. In a typical reaction, reactants are poured into the Teflon vessel. Afterward, the autoclave is heated to a temperature up to 250 °C and under autogenic pressure as high as 40 bars.

View of a hydrothermal autoclave. The reaction takes place in the Teflon vessel

KNbO3 nanowires array grown on the surface of SrTiO3 wafer. 

Epitaxial interface between the SrTiO3 substrate and the KNbO3 nanowires.

We produce a broad range of materials  TiO2, ZnO and V2O5 nanofilaments as well as KNbO3 [1, 2] and LiNbO3 nanowires [3]. Few illustrations are given below

   

V2O5 nanotubes

  

TiO2 nanotubes

ZnO nanowires

References:

[1] A. Magrez, E. Vasco, J.W. Seo, C. Dieker, N. Setter and L. Forró J. Phys. Chem. B 110, 58 (2006)
[2] E. Vasco, A. Magrez, L.Forró and N. Setter J. Phys. Chem. B 109, 14331 (2005)
[3] R. Grange, J.W. Choi, C.L. Hsieh, Y. Pu, A. Magrez, R. Smajda, L. Forró, D. Psaltis Appl. Phys. Lett. 95, 143105 (2009).
[4] B. Sipos et al., J. Appl. Phys. 105, 074317 (2009).
[5] Z. Micković, D.T. L. Alexander, A. Sienkiewicz, M. Mionić, L. Forró, A. Magrez, Cryst. Growth Des., 2010, 10, pp 4437–4441
[6] N. Tétreault, E. Horváth, T. Moehl, J. Brillet, R. Smajda, S. Bungener, N.Cai, P. Wang, S. M. Zakeeruddin, L.Forró, A. Magrez, M. Grätzel, ACS Nano, 2010, 4 (12), pp 7644–7650.