6.5.2 Gas Selectivity Improvement of YSZ-based VOC Sensor via Application of Selective Catalytic Layer over Sensing-electrode
- Event
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
Nürnberg/Nuremberg, Germany - Chapter
- 6.5 YSZ Based Sensors
- Author(s)
- T. Sato - Interdisciplinary Graduate School of Engineering Sciences, Kyushu University (Japan), M. Breedon - Japan Society for the Promotion of Science (Japan), N. Miura - Art, Science and Technology Center for Cooperative Research, Kyushu University (Japan)
- Pages
- 566 - 568
- DOI
- 10.5162/IMCS2012/6.5.2
- ISBN
- 978-3-9813484-2-2
- Price
- free
Abstract
A volatile organic compound (VOC) gas sensor which utilizes yttria-stabilized zirconia (YSZ) solidelectrolyte and an NiO sensing-electrode (SE) was fabricated and its sensing properties to VOCs and interfering gases typically found indoors were evaluated. The sensitivity measurements towards C7H8 (toluene) and common interfering gases (C3H6, H2, CO, NO2, C2H5OH (ethanol)) revealed that toluene detection was strongly affected by high concentrations of ethanol. To overcome this limitation, an SnO2 catalyst layer which selectively oxidizes ethanol was laminated directly onto the NiO layer. The obtained sensor utilizing an SnO2/NiO-SE was capable of sensitive and selective detection of toluene in ppb levels. Sensitivity measurements toward decreasing toluene concentration revealed that the developed sensor was capable of detecting toluene as low as 10 ppb.