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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.55  No.7 (2014)  >  pp.1040-1044

MATERIALS TRANSACTIONS
<<Previous article Vol.55  No.7 (2014)   pp.1040 - 1044 Next article>>

Highly Sensitive Ball Surface Acoustic Wave Hydrogen Sensor with Porous Pd-Alloy Film

Toshihiro Tsuji1), Ryosuke Mihara1), Tomohiro Saito1), Satoshi Hagihara1), Toru Oizumi1), Nobuo Takeda1), Tsuneo Ohgi2), Takayuki Yanagisawa2), Shingo Akao1) 2), Noritaka Nakaso2), Kazushi Yamanaka1)
1) Tohoku University 2) Toppan Printing Co. Ltd.

In order to commonly use explosive H2 gas as an energy source, fast, sensitive, and low-power consumption sensor is required. We developed a ball surface acoustic wave (SAW) sensor with porous Pd–Pt alloy film to realize such a sensor. The sensor with 20% Pt alloying film was useful for the suppression of a phase transition of Pd and the detection of ppm order concentration at 35°C. The amplitude response was proportional to the square root of the concentration, which was demonstrated for the first time in the field of SAW sensor, resulting in the detection limit of 3.7 ppm at signal to noise ratio of 3. The response time decreased to 1/5, compared with those of pioneering H2 sensors working at room temperature. From these results, it was shown that the fastest and most sensitive hydrogen sensor working at room temperature could be realized using the ball SAW sensor with porous Pd alloy film.


Keyword:
surface acoustic wave, hydrogen sensor, palladium platinum alloy, porous film, response time

Received: July 31, 2013
Accepted: January 07, 2014 , Published online: June 25, 2014
Copyright © 2014 The Japanese Society for Non-Destructive Inspection

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