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Humidity-sensitive SAW device based on TPPS4 nanostrip structure

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7 Author(s)

The response to ambient humidity of the surface acoustic wave devices based on TPPS4 -LiNbO3 structures has been experimentally studied. Both monomer and self assembled J-aggregates nanostrip TPPS4 films were used. The SAW delay-line transmission and SAW oscillator frequency exhibit considerable sensitivity to ambient humidity. With growing humidity, the transmission loss of the SAW delay-line increases, and the SAW oscillator frequency decreases. Typically, the monomer films are more sensitive to humidity changes than the aggregate films. In the SAW frequency range 50-300 MHz, the structure response noticeably increases with frequency increase. The TPPS4 based SAW device exhibited a very fast response to abrupt humidity changes with a characteristic time of not more than 0.6 sec.

Published in:

Sensors, 2006. 5th IEEE Conference on

Date of Conference:

22-25 Oct. 2006

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