P1.4.4 Effects of nanoadditives on the stability of chemical gas sensors
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
- P1.4 Nanostructured Sensors
- S. Vahdatifar, A. Khodadadi - School of Chemical Engineering, College of Engineering, University of Tehran (Iran), Y. Mortazavi - Nanoelectronics centre of Excellence, University of Tehran (Iran)
- 990 - 993
The effects of dopants and annealing temperatures on the long term stability of the SnO2-based gas sensors to CO were investigated by doping Pt/SnO2 nanoparticles with CeO2, Sm2O3 and SiO2 at 700 and 850ºC. Accelerated stability tests were performed by exposing the fresh powders and the fabricated sensors to humid air at 600ºC for 15 days. Gas sensing measurements were carried out on the fabricated sensors at the 5th, 9th, 12th and 15th days in addition to the fresh point. CeO2 and SiO2 addition were found to be effective in stabilizing the performance of Pt/SnO2 sensor , while Sm2O3 did not have the same effect. Increasing the annealing temperature led to a decrease in sensitivity decline during the exposure period.