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High-tech hydrogen gas sensor

: Zimmer, M.; Eisele, I.; Neumeier, K.; Endres, H.-E.; Hagler, R.; Grimm, H.

Saneistr, J.:
Eurosensors XVI. Book of abstracts : The 16th European Conference on Solid-State Transducers, September 15-18, 2002, Prague, Czech Republic
Praha, 2002
ISBN: 80-01-02576-4
European Conference on Solid-State Transducers <16, 2002, Praha>
Conference Paper
Fraunhofer IZM ()
gas sensor; FET; hydrogen; chemical sensor

Hydrogen is predicted to be a very important energy source in the future. Hydrogen is not sensed by the human olfactory system and it is ignitable in air for concentrations from 4 to 75%. With regard to these facts a cheap, stable and low power hydrogen sensor for survey is claimed. This is not possible with standard electrochemical cells or conductivity sensors. As the energy technology will advance one must think about new sensor principles with more favorable characteristics. The work function principle of gas sensing with the presented GasFET shows many excellent properties: The power consumption is less than 3 mW, the sensor is stable for over 1 year without any change in signal, the response is very fast (t50 < 10 sec.) and there is an outstanding selectivity to hydrogen.