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Ta2O5- and TiO2-based nanostructures made by atomic layer deposition.

Marianna Kemell1, Emma Härkönen, Viljami Pore

  • 1Department of Chemistry, University of Helsinki, Helsinki, Finland. marianna.kemell@helsinki.fi

Nanotechnology
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Summary

Researchers created novel nanotubular tantalum pentoxide (Ta2O5) and titanium dioxide (TiO2) structures. These nanomaterials exhibit photocatalytic activity and potential for catalysis and energy storage applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Catalysis

Background:

  • Development of advanced nanostructured materials is crucial for various technological applications.
  • Tantalum pentoxide (Ta2O5) and titanium dioxide (TiO2) are versatile materials with potential in catalysis and energy storage.
  • Atomic layer deposition (ALD) offers precise control over thin film growth for creating complex nanostructures.

Purpose of the Study:

  • To synthesize nanotubular Ta2O5 and TiO2 structures using atomic layer deposition.
  • To investigate the photocatalytic activity of the synthesized TiO2 nanotubes.
  • To explore potential applications of these nanostructures in catalysis and energy storage.

Main Methods:

  • Atomic layer deposition (ALD) of Ta2O5 and TiO2 thin films onto porous alumina membranes.
  • Utilized both self-supporting and Si-supported alumina membranes as templates.
  • Fabricated Ta2O5-coated Ni nanorod arrays on Si substrates using electrodeposition, chemical etching, and ALD.

Main Results:

  • Successfully prepared long Ta2O5 and TiO2 nanotubes using self-supporting membranes.
  • Demonstrated photocatalytic activity of TiO2 nanotubes in methylene blue degradation under UV light.
  • Synthesized robust Ta2O5-coated Ni nanorod arrays on Si substrates.

Conclusions:

  • Nanotubular Ta2O5 and TiO2 structures can be effectively fabricated using ALD on porous templates.
  • The synthesized TiO2 nanotubes show promise for photocatalytic applications.
  • These nanostructures hold potential for use as catalysts, solid-state capacitors, and electrochemical capacitors.