2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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TechConnect Summit
Clean Technology 2008

Preparation and applications of transition metal oxide nanofibres and nanolines

T. Tätte, M. Paalo, M. Part, V. Kisand, A. Lõhmus, I. Kink
University of Tartu, EE

Keywords:
sol-gel, nano optics, nanostructures, nanofibres

Abstract:
Recently many nanoscale silica structures have been suggested for optics device design. For example silica nanoneedles are used for focusing light into spot some tens of nanometers in diameter and sub-wavelength diameter silica fibres are proposed for sensor applications. However, there are insuperable drawbacks in realizing devises based on silica (glass and quartz) because of their low refractive indexes. To overcome these drawbacks high refractive index materials like transition metal oxides must be used instead of silica. In order to shape transition metal oxides to low-dimensional fibers and needles we have recently proposed a new approach that utilizes alkoxide based concentrates as precursors. The precursors are suitable for pulling nanometrically sharp needles, nanofibers and can be effectively used for grafting defined shape microscopic oxide lines to different flat substrates. Technology suitable for connecting separate points on flat surfaces with oxide fibres is suggested. Being carried out at room temperature, technologies based on concentrates have advantages like easier doping and possibility to structure substrates that decompose at elevated temperatures. In this work we generalize the conceptual background of preparation of transition metal oxides, and describe the critical aspects related to its use in real production.


Nanotech 2008 Conference Program Abstract