P1GS.11 - Enhanced NO2 response of surface decorated WO3 lowcost gas sensors
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
- P-1 - Gas Sensors
- S. Emamjomeh, C. Cantalini, V. Paolucci - University of L'Aquila, L'Aquila (Italy), D. Williams - University of Auckland, Auckland (New Zealand), L. Lee, G. Henshaw - Aeroqual Ltd., Auckland (New Zealand)
- 539 - 540
The aim of this work is to enhance the electrical responses of low-cost WO3 chemo-resistive gas sensors to sub-ppm NO2 gas concentration through doping with different concentrations of Y2O3. Y2O3 surface decorated WO3 gas sensors were prepared by screen-printing and annealed at 800 ˚C. X-ray Diffractometry (XRD) and Scanning Electron Microscopy (SEM) were used to study the phase evolution and morphology of fabricated films, respectively. Results showed that Y2O3 nanoparticles are well dispersed within the bulk WO3 and have decorated the surface of WO3 grains. Electrical measurements at 350˚C operating temperature, showed that the relative responses (RR) of fabricated sensor to 200 ppb NO2 is significantly improved by adding just 1% Y2O3. Besides, NO2 adsorption and desorption time (Ʈads and Ʈdes) decreased to 75% and 50% of that of undoped sample, respectively.