ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Detection of hydrogen gas is a crucial task for establishing safety and reliability of fuelcells, a key technology for the environment and our society. However, hydrogen is difficult to detectand various hydrogen sensors have many drawbacks. Here we report a novel hydrogen gas sensor,the ball surface acoustic wave (SAW) sensor, using Pd or PdNi sensitive film. The ball SAW sensoris based on a novel phenomenon, diffraction-free propagation of collimated beam along an equatorof sphere. The resultant ultra-multiple roundtrips of SAW makes it possible to achieve highestsensitivity among SAW sensors. Moreover, it enables to use a very thin sensitive film, andconsequently the shortest response time (2s) was realized. In terms of the sensing range, it has thewidest range of 10 ppm to 100 % among any hydrogen sensors including FET or resistivity sensors.The ball SAW sensor can be applied not only to hydrogen but also to any gasses and possibly toliquids
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.321-323.48.pdf
