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We report a high-quality-factor (Q) film bulk acoustic resonator (FBAR) operating in liquid environments. By integrating a microfluidic channel to a longitudinal-mode FBAR, aQof up to 150 is achieved with direct liquid contacting. A transmission line model is used to theoretically predict theQbehavior of the FBAR. The model suggests an oscillatory pattern ofQas a function of the channel thickness and the acoustic wavelength in the liquid, which is experimentally verified by precisely controlling the channel thickness. This FBAR biosensor is characterized in liquids for the real-time in situ monitoring of the competitive adsorption/exchange of proteins, the Vroman effect. The FBAR offers a minimum detectable mass of 1.35 ng/cm2and is successfully implemented in a Pierce oscillator as a portable sensing module.
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Xu et al. (2010) studied this question.
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