GS9.5 - Factors affecting the electrical conductivity of TiO2-based gas sensors
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
- Gas Sensors 9 - Hydrogen Sensing
- A. Haidry, L. Sun, Z. Li, L. Xie, Q. Fatima, Z. Yao - College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing (China)
- 330 - 331
Polycrystalline TiO2 submicron-grains with only rutile phase were synthesized via cost-effective thermal oxidation method under high temperature annealing. The gas sensors on these submicrongrains show excellent gas sensing properties in terms of their sensitivity, stability and reaction times. In addition to excellent sensing characteristics the sensors also show strong dependence of n/p type conductivity inversion various measurement conditions such as gas concentration, operating temperature and applied voltage. Further, the effect of surface modification by Ag, Ni, Pt and Au thin film on structural, morphological and gas sensor characteristics is studied in detail. The current study offer novel sensing phenomena that can be exploited to tailor the selectivity of the sensors.