Surface acoustic wave gas phase sensor using self-assembled monolayer film

T. Nomura, A. Saitoh, S. Furukawa

Research output: Contribution to journalConference articlepeer-review


A surface acoustic wave (SAW) sensor for measuring environment is presented. SAW devices respond to changes in the mass on its surface with a shift in frequency, and offer many attractive features for applications as a gas and liquid phase sensor. In the most gas phase sensor, the device surface is coated with a thin selective film. In this paper a SAW delay line coated with self-assembled (SA) film has been used as environment sensor. A dual delay line was fabricated on a single lithium niobate (128° Y cut X propagating LiNbO3) substrate and the propagation path was coated with the selective polymer film deposited by SA transfer technique. The polystyrene sulfonic acid sodium was used as a gas sensing material. Due to sorption of molecules, the electrical conductivity of the SA film changes. The effects caused to reduce the velocity of the SAW. Experimental results showed that the SAW velocity change was quite linear in proportion to the concentration of organic gases. Rapid and totally reversible responses were obtained by using a SA monolayer film.

Original languageEnglish
Pages (from-to)525-528
Number of pages4
JournalProceedings of the IEEE Ultrasonics Symposium
Publication statusPublished - 1998 Dec 1
EventProceedings of the 1998 International Ultrasonics Symposium - Sendai, Miyagi, Jpn
Duration: 1998 Oct 51998 Oct 8

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


Dive into the research topics of 'Surface acoustic wave gas phase sensor using self-assembled monolayer film'. Together they form a unique fingerprint.

Cite this