Emats for Immunosensors

Ogi, Hirotsugu; Motohisa, Kazuma; Hoso, Y.; Hatanaka, Kenichi; Ohmori, Toshinobu; Hirao, Hajime

doi:10.1063/1.2902748

Cited by 2 publications

(2 citation statements)

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“…Since then the applications have included inspecting the welds of sheet metal in a rolling mill, railroad rail inspection and a thickness gage for seamless stainless steel tubing [7]. In contrast to the earlier EMAT applications, which were on the macro scale, recent EMAT applications have been used on a micro scale for a broad array of sensing applications, which include biosensors [8] and liquid sensors [9].…”

Section: Electromagnetic Acoustic Transducermentioning

confidence: 99%

“…The results of these tests (figures [6][7][8] show that in addition to being extremely sensitive to electrical property changes (conductivity and relative permittivity), the LFE is also more sensitive to mechanical property changes (viscosity) than the QCM. In the cases of conductivity and viscosity the resonant frequency shift of the LFE sensor is negative while for the dielectric constant it increases as the relative dielectric constant decreases.…”

Section: Liquid Property Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Recent advances in lateral field excited and monolithic spiral coil acoustic transduction bulk acoustic wave sensor platforms

McCann¹,

French²,

Wark³

et al. 2009

Meas. Sci. Technol.

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The quartz crystal microbalance (QCM) has been used extensively as a bulk acoustic wave (BAW) platform for applications such as chemical and biological sensors and rate monitors in thin film deposition systems. Although the QCM is capable of measuring mechanical property changes critical in many thin film deposition systems, it cannot measure electrical property changes that can occur in many sensor applications. In this paper we review the recent developments of two novel transducer configurations for BAW sensors. In the first sensor, called the lateral field excited (LFE) sensor, the transverse shear mode (TSM) in AT-cut quartz is excited by two electrodes on the reference surface, resulting in a bare sensing surface which allows both electrical and mechanical properties of target analytes to be measured. In the second sensor, called the monolithic spiral coil acoustic transduction (MSCAT) sensor, the TSM is excited by a photolithographically deposited spiral antenna on the reference surface which can excite high-order harmonics in the substrate, and potentially lead to increased sensitivity. The responses of both the LFE and MSCAT sensors to electrical and mechanical property changes of liquids have been examined and compared to the response of the standard QCM. In addition, results relating to the detection of chemical and biological target analytes using the LFE and MSCAT sensor platforms are presented.

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Section: Electromagnetic Acoustic Transducermentioning

confidence: 99%

Section: Liquid Property Measurementsmentioning

confidence: 99%