E7.3 - Photonic metal oxide gas sensors: low temperature ozone sensing by cyclic optical excitation of In2O3
- AMA Conferences 2015
2015-05-19 - 2015-05-21
- Proceedings SENSOR 2015
- E7 - Gas Sensors III
- D. Meixner, C. Kohl - Justus Liebig University Giessen (Germany), T. Wagner - University of Paderborn (Germany)
- 708 - 711
Enhancing and activating reactivity of metal oxides to gases by optical excitation is already a well investigated field of heterogeneous catalysis. Observed effects as e.g. the already mentioned activity enhancement or increasing selectivity are also of high interest in the field of resistive semiconducting gas sensors. Most of the already investigated systems are nanostructured. However, even though many positive influences on the sensing performance were observed, there are only a very few systematic investigations related to the basic effects. In the current work we therefore like to present a systematic study on cyclic illumination of nanostructured indium oxide (In2O3) for gas sensing applications. Indium oxide is a suitable model material since it can be used to detect oxidizing gases even at room temperature. Therefore the influence of illumination can be separated from thermal activation. We present results on low temperature ozone sensing and generation of multiple signals by cyclic illumination of ordered nanoporous In2O3 utilizing blue LEDs.