Callaghan Innovation Research Papers

Back to Research Papers

TitleNovel materials based on organic-tungsten oxide hybrid systems II: Electronic properties of the W-O framework
Publication TypeJournal Article
Year of Publication2004
AuthorsIngham, B., Chong S.V., and Tallon J.L.
JournalCurrent Applied Physics
Pagination202 - 205
Date Published2004
ISSN15671739 (ISSN)
AbstractIn this paper we report experimental and theoretical results concerning the band structure of tungsten trioxide and how this system relates to a new class of layered organic-inorganic hybrid materials based on a tungsten oxide framework. UV-visible spectroscopy was performed on various tungsten trioxide samples. Diffuse reflectance on powder samples indicates a single absorption edge centred at 2.8 eV, while transmission and reflectance of thin films show a strong feature at 4.0 eV. This is supported by ab initio calculations, in which a strong peak is seen at 4.0 eV in the density of states. For the hybrid system, 1, n -diaminoalkane tungsten oxide, a change in the calculated band structure is seen compared with the tungsten oxide system; a peak appears just above 3.0 eV in the density of states with a low intensity 'tail' below this. UV-visible spectra of powder reflectance of hybrid samples indicate a dominant absorption edge centred at 4.0 eV. © 2003 Elsevier B.V. All rights reserved.

Back to top