P2GS.22 - Conductometric Hydrogen Gas Sensors Operating at Room Temperature with Irradiation of LED Lights
- Event
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria - Chapter
- P-2 - Gas Sensors
- Author(s)
- T. Takahashi, T. Yamaguchi, K. Hara - Tokyo Denki University, Tokyo (Japan)
- Pages
- 809 - 810
- DOI
- 10.5162/IMCS2018/P2GS.22
- ISBN
- 978-3-9816876-9-9
- Price
- free
Abstract
We present novel conductometric hydrogen gas sensors using Pt, Pd, and Ag doped tungsten oxide film operating at room temperature with irradiation of LED lights. Three kinds of LEDs (red, blue and violet) were used in this study. Ammonium paratungstate hydrate solution with addition of various catalysts was spin-coated on an alumina substrate and sintered at 600 °C for 1 h in air. When LED lights irradiated the tungsten oxide film, the electron density increased and thus the conductance increased. At the same time, the sensor was sensitive to hydrogen gas at a concentration as low as 100 ppm at room temperature (25 °C). The selectivity to hydrogen gas was satisfactory. The sensor response and recovery times were approximately 190 s and 270 s, respectively.