P2.4.8 Effect of the Titania Substitution on the Electronic Structure and Transport Properties of FSS-made Fe2O3 Nanoparticles for Hydrogen Sensing
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
- P2.4 Nanostructured Sensors
- D. Flak, M. Rekas - Faculty of Material Science and Ceramics, AGH University of Science and Technology (Poland), A. Braun - Laboratory for High Performance Ceramics, Empa, Swiss Federal Laboratories for Materials Science and Technology (Switzerland), A. Vollmer - BESSY GmbH (Germany)
- 1521 - 1524
Substitution of Fe2O3 with 5-20 mole % TiO2 by flame spray synthesis forms solid solutions of single crystal nanoparticles as small as 15.5 nm with a correspondingly high specific surface area (95 m2/g), as measured with xray diffraction and transmission electron microscopy. Their electronic structure and microstructure lends the solid solution a characteristic which can be exploited for H2 sensing, more so than pure alpha- Fe2O3. With a combination of optical spectroscopy and advanced near edge xray absorption fine structure (NEXAFS) spectroscopy, we are able to qualitatively probe the electronic structure and describe the mechanisms of hydrogen sensing at the molecular scale and correlate the hydrogen sensing property with charge transfer and valence band characteristics.