Flexible piezoelectric micromachined ultrasonic transducer (pMUT) for application in brain stimulation

Jin Hyung Lee; Il Joo Cho; Kyungmin Ko; Eui Sung Yoon; Hyung Ho Park; Tae Song Kim

doi:10.1007/s00542-016-2912-5

Flexible piezoelectric micromachined ultrasonic transducer (pMUT) for application in brain stimulation

Jin Hyung Lee, Il Joo Cho, Kyungmin Ko, Eui Sung Yoon, Hyung Ho Park, Tae Song Kim

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

We propose a new flexible piezoelectric micromachined ultrasonic transducer (pMUT) array integrated on flexible polydimethylsiloxane (PDMS) that can be used in studying brain stimulation by ultrasound. To achieve the technical demands of a high sound pressure level and flexibility, a diaphragm-type piezoelectric ultrasound transducer array was manufactured with 55 μm-thick bulk lead zirconate titanate (PZT) that was thinned after bonding with a silicon wafer. The ultrasound transducer array was then strongly bonded onto a PDMS substrate using an oxygen-plasma treatment followed by precise dicing with a fixed pitch to achieve flexibility. The radius of curvature was smaller than 5 mm, which is sufficient for attachment to the surface of a mouse brain. After a thinning process for the PZT layer, we observed that the PZT layer still maintained a high ferroelectric property. The measured remnant polarization (P_r) and coercive field (E_c) were 28.26 μC/cm² and 79 kV/cm, respectively. The resonant frequencies of fabricated pMUT elements with different membrane sizes of 700, 800, 900, 1200 μm in diameter were measured to be 694.4, 565.4, 430.8, and 289.3 kHz, respectively. By measuring the ultrasound output pressure, a pMUT showed a sound intensity (I_sppa) of 44 mW/cm² at 80 V, which is high enough for low-intensity ultrasound brain stimulation.

Original language	English
Pages (from-to)	2321-2328
Number of pages	8
Journal	Microsystem Technologies
Volume	23
Issue number	7
DOIs	https://doi.org/10.1007/s00542-016-2912-5
Publication status	Published - 2017 Jul 1

Bibliographical note

Publisher Copyright:
© 2016, Springer-Verlag Berlin Heidelberg.

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Hardware and Architecture
Electrical and Electronic Engineering

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Cite this

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abstract = "We propose a new flexible piezoelectric micromachined ultrasonic transducer (pMUT) array integrated on flexible polydimethylsiloxane (PDMS) that can be used in studying brain stimulation by ultrasound. To achieve the technical demands of a high sound pressure level and flexibility, a diaphragm-type piezoelectric ultrasound transducer array was manufactured with 55 μm-thick bulk lead zirconate titanate (PZT) that was thinned after bonding with a silicon wafer. The ultrasound transducer array was then strongly bonded onto a PDMS substrate using an oxygen-plasma treatment followed by precise dicing with a fixed pitch to achieve flexibility. The radius of curvature was smaller than 5 mm, which is sufficient for attachment to the surface of a mouse brain. After a thinning process for the PZT layer, we observed that the PZT layer still maintained a high ferroelectric property. The measured remnant polarization (Pr) and coercive field (Ec) were 28.26 μC/cm2 and 79 kV/cm, respectively. The resonant frequencies of fabricated pMUT elements with different membrane sizes of 700, 800, 900, 1200 μm in diameter were measured to be 694.4, 565.4, 430.8, and 289.3 kHz, respectively. By measuring the ultrasound output pressure, a pMUT showed a sound intensity (Isppa) of 44 mW/cm2 at 80 V, which is high enough for low-intensity ultrasound brain stimulation.",

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Flexible piezoelectric micromachined ultrasonic transducer (pMUT) for application in brain stimulation

Abstract

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