Journal ArticleDOI
Sensors based on piezoelectric resonators
Abstract:
A review of sensors based on piezoelectric crystal resonators is presented. The survey focuses on the fundamental resonator modes rather than on the variety of surrounding support configurations in special sensor applications. First, the general properties of vibrating crystal sensors and their inherent superiority are described. The sensor concepts utilizing either homogeneous resonators with temperature and pressure (stress) as primary measurants or composite resonators with areal mass density and viscoelastic properties of the 'foreign' layer as primary measurands are discriminated. A comparison between bulk acoustic wave (BAW) and surface acoustic wave (SAW) resonators with respect to their primary sensitivity functions and principal capabilities for sensor applications is given and the importance of recent investigations on Lamb wave and horizontal polarized shear wave (HPLW) interdigital transducer (IDT) resonators is acknowledged. The importance of mode purity for high dynamic range sensors based on resonators and some aspects of the demand on specialized electronics are emphasized. The present state of established sensors based on primary sensitivities, e.g., quartz-crystal thermometers, pressure transducers, thin-film thickness and deposition-rate monitors, viscoelastic layer analysers (crystal/liquid composite resonators) is reviewed. A selection of the most promising recently investigated vibrating crystal sensors utilizing indirect sensitivities is described, including the wide field of analyte-selective coatings and resonator-based immunosensors or immunoassays. Finally, the potential of alternative piezoelectric materials for future sensor developments is briefly discussed.read more
Citations
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Piezoelectric Mass‐Sensing Devices as Biosensors—An Alternative to Optical Biosensors?
TL;DR: The future will show whether the quartz-crystal microbalance will assert itself against established label-free sensor devices such as surface plasmon resonance spectroscopy and interferometry.
Journal ArticleDOI
Advantages and Challenges of Relaxor-PbTiO3 Ferroelectric Crystals for Electroacoustic Transducers- A Review.
TL;DR: In this review, the performance merits of relaxor-PT crystals in various electroacoustic devices are presented from a piezoelectric material viewpoint and the impacts and challenges are summarized to guide on-going and future research in the development of relaxors for the next generation electroac acoustic transducers.
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Interdigital sensors and transducers
TL;DR: Capacitive, inductive, dielectric, piezoacoustic, chemical, biological, and microelectromechanical interdigital sensors and transducers are brought under one umbrella to discuss fabrication techniques, modeling of sensor parameters, application examples, and directions of future research.
Journal ArticleDOI
Materials for high temperature piezoelectric transducers
TL;DR: The most significant advance in this field in the past year has been the demonstration that single-crystal langasite, La3Ga5SiO14, can be used, at least at high frequencies, at temperatures up to 1000 degrees C as mentioned in this paper.
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Configurational biomimesis in drug delivery: molecular imprinting of biologically significant molecules.
J. Zachary Hilt,Mark E. Byrne +1 more
TL;DR: The application of imprinted polymers for sustained release, enhanced loading capacity, and enantioselective loading or release are discussed and the most important problems to be solved in the design of synthetic recognition-based networks for biological molecules are highlighted.
References
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Verwendung von Schwingquarzen zur Wägung dünner Schichten und zur Mikrowägung
TL;DR: In this paper, eigenfrequenz der Platte infolge Vergroserung der schwingenden Masse is vermessen, so das eine empirische Eichung bei der Schichtwagung mit Schwingquarzen entfallt.
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Use of quartz vibration for weighing thin films on a microbalance
G. Sauerbrey,F. Sauerbrey +1 more
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The oscillation frequency of a quartz resonator in contact with liquid
TL;DR: In this article, a simple relationship was derived which expressed the change in oscillation frequency of a quartz crystal in contact with a fluid in terms of material parameters of the fluid and the quartz.
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Characterization of a quartz crystal microbalance with simultaneous mass and liquid loading
Journal ArticleDOI
Direct piezoelectric coupling to surface elastic waves
Richard M. White,F. W. Voltmer +1 more