P1.0.13 Highly sensitive ZnO−SnO2 nanocomposite H2 gas sensor
- 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. Verma, V. Gupta - Department of Physics and Astrophysics, University of Delhi (India)
- Pages
- 787 - 790
- DOI
- 10.5162/IMCS2012/P1.0.13
- ISBN
- 978-3-9813484-2-2
- Price
- free
Abstract
Thin film sensors based on SnO2, ZnO and ZnO−SnO2 nanocomposite have been fabricated using pulsed laser deposition technique. The prepared sensors were studied for their response characteristics towards 500 ppm H2 gas. The nanocomposite sensor structure (ZnO−SnO2) shows an enhanced response of about 8.8×102 as compared to that obtained (7 and 8) for bare ZnO and SnO2 thin film sensors respectively at a relatively lower operating temperature of 160°C. The nanocomposite sensor shows an improvement in response and recovery speeds compared to that of pure ZnO film sensor, though the results are slightly degraded in comparison to the bare SnO2 thin film based sensor structure. The origin of enhanced response of ZnO − SnO2 composite sensor is attributed to the modulation of depletion region width at the n−n heterojunction besides the enhanced oxygen adsorption. The high sensing response obtained at low operating temperature for ZnO− SnO2 composite sensor is attractive for efficient detection of H2 gas.