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- W1990696939 abstract "The theory describing the operation of a surface acoustic wave (SAW) hydrogen sulfide (H2S) sensor was examined. This sensor employs a tungsten trioxide (WO3) chemiresistive overlay deposited as the sensing element on a SAW delay line. Previous work has shown that a change in the film's DC conductivity upon exposure to a target gas, such as H2S, has far more influence on the SAW than the film's mechanical properties. However, early work also pointed out that higher sensitivities had been experienced experimentally than the current theory suggests. The objective of the current work was to reexamine the theory describing the effect of a film's electrical properties on SAW velocity. Perturbation theory has been employed to characterize the effects of the film's DC conductivity, dielectric constant and device operating frequency on the SAW gas sensor. Experimental work was conducted on a SAW delay line residing on a cut of quartz optimized for stability at high temperature." @default.
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- W1990696939 date "1996-09-01" @default.
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- W1990696939 title "The integration of a chemiresistive film overlay with a surface acoustic wave microsensor" @default.
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- W1990696939 doi "https://doi.org/10.1016/s0925-4005(97)80047-0" @default.
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