Mercuric Ion Sensing by a Film Bulk Acoustic Resonator
Copyright policy )Mercuric Ion Sensing by a Film Bulk Acoustic Resonator
This paper describes a film bulk acoustic resonator (FBAR) mass sensor for detecting Hg2+ ion in water with excellent sensitivity and selectivity. When a thin Au film was deposited on the surface of an FBAR, the resonant frequency shifted to a lower value when the film was exposed to Hg2+ in aqueous solution. The FBAR sensor detected as low as 10(-9) M Hg2+ (0.2 ppb Hg2+) in water. Other ions such as K+, Ca2+, Mg2+, Zn2+, and Ni2+ had little or no effect on the resonant frequency of the FBAR. Coating of the FBAR Au surface with a self-assembled monolayer (SAM) of 4-mercaptobenzoic acid decreased the Hg2+ response.
- University of California System United States
- University of Southern California United States
Ions, Transducers, Water, Membranes, Artificial, Acoustics, Equipment Design, Mercury, Sensitivity and Specificity, Vibration, Equipment Failure Analysis, Solutions
Ions, Transducers, Water, Membranes, Artificial, Acoustics, Equipment Design, Mercury, Sensitivity and Specificity, Vibration, Equipment Failure Analysis, Solutions
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