MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Highly Sensitive Ball Surface Acoustic Wave Hydrogen Sensor with Porous Pd-Alloy Film
Toshihiro Tsuji, Ryosuke Mihara, Tomohiro Saito, Satoshi Hagihara, Toru Oizumi, Nobuo Takeda, Tsuneo Ohgi, Takayuki Yanagisawa, Shingo Akao, Noritaka Nakaso, Kazushi Yamanaka
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Keywords: surface acoustic wave, hydrogen sensor, palladium platinum alloy, porous film, response time
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2014 Volume 55 Issue 7 Pages 1040-1044

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Abstract

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.

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© 2014 The Japanese Society for Non-Destructive Inspection
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Transactions of the Japan Institute of Metals

Materials Transactions, JIM

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