Electronic Properties of Polycrystalline and Amorphous WO3 Investigated with Scanning Tunnelling Spectroscopy

  • L. Ottaviano
  • E. Maccallini
  • S. Santucci
Conference paper
Part of the Lecture Notes in Physics book series (LNP, volume 588)


The potential of Scanning Tunnelling Spectroscopy in the investigation of the local electronic properties of materials used as gas sensors is presented and discussed, focusing on the case of polycrystalline and amorphous WO3. By taking I-V curves it can be evidenced, with sub-nanometer spatial resolution, the difference in the conductivity measured at the boundaries and on the surface of individual nanoparticles. This experimental information can be used to derive an unprecedented detailed microscopic picture of the electric behaviour of such materials. Accordingly new models for the gas sensing mechanism of thin films of WO3 and other similar metal-oxide semiconductors can be proposed.


Interstitial Region Scan Tunnelling Spectroscopy Crystallite Boundary Scan Tunnelling Spectroscopy Measure Local Electronic Property 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2002

Authors and Affiliations

  • L. Ottaviano
    • 1
  • E. Maccallini
    • 1
  • S. Santucci
    • 1
  1. 1.INFM Unit and Physics DepartmentUniversity of L’AquilaCoppito L’AquilaItaly

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