P1.0.19 Hydrogen Sensing Properties of Pt/Lanthanum Oxide-Molybdenum Oxide Nanoplatelet/SiC Based Schottky Diode
- Event
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
Nürnberg/Nuremberg, Germany - Chapter
- P1.0 Metal Oxide-based Sensors
- Author(s)
- M. Shafiei, N. Motta - School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology (Australia), J. Yu, G. Chen, P. Lai - Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, K. Kalantar-zadeh - School of Electrical and Computer Engineering, RMIT University (Australia)
- Pages
- 802 - 805
- DOI
- 10.5162/IMCS2012/P1.0.18
- ISBN
- 978-3-9813484-2-2
- Price
- free
Abstract
An investigation of the electrical and hydrogen sensing properties of a novel Schottky diode based on a nanostructured lanthanum oxide-molybdenum oxide compound is presented herein. Molybdenum oxide (MoO3) nanoplatelets were grown on SiC substrates via thermal evaporation which was then subsequently coated with lanthanum oxide (La2O3) by RF sputtering. The current-voltage characteristics and hydrogen sensing performance (change in barrier height and sensitivity as well as the dynamic response) were examined from 25 to 300°C. At 180°C, a voltage shift of 2.23V was measured from the sensor while exposed to 1% hydrogen gas under a 100 μA constant reverse bias current. The results indicate that the presence of a La2O3 thin layer substantially improves the hydrogen sensitivity of the MoO3 nanoplatelets.