Enhanced thereto-electro-mechanical characteristics of purified P(VDF-TrFE) films for ultrasonic transducers
- Authors
- Park, Cheon-Ho; Quang Van Duong; Moon, Yong-Ju; Ha, Kanglyeol; Choi, Seung Tae
- Issue Date
- Aug-2018
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Piezoelectric polymer; P(VDF-TrFE); Crystallinity; Thermal stability; Ultrasonic transducer; Pulse-echo response
- Citation
- SENSORS AND ACTUATORS A-PHYSICAL, v.279, pp 586 - 592
- Pages
- 7
- Journal Title
- SENSORS AND ACTUATORS A-PHYSICAL
- Volume
- 279
- Start Page
- 586
- End Page
- 592
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/902
- DOI
- 10.1016/j.sna.2018.06.060
- ISSN
- 0924-4247
- Abstract
- In this study, the fabrication process of a piezoelectric poly[(vinylidenefluoride-trifluoroethylene) [P(VDF-TrFE)] film was optimized to maximize its crystallinity and piezoelectric properties and to improve its thermal stability. The effect of purification of P(VDF-TrFE) solution dissolved in methyl ethyl ketone [MEK] and uniaxial stretching on the properties and performance of P(VDF-TrFE) film was studied. In the purification process, the solution was filtered with a syringe filter with 2.7 mu m pores. X-ray diffraction measurements showed that the stretching and purification processes increased the crystallinity of the P(VDF-TrFE) films by approximately 16.2% and 2.2%, respectively. A high-temperature storage test showed that the unstretched P(VDF-TrFE) films lose most of their polarization after 1-h storage at 70 degrees C. The stretching process greatly increased the thermal stability of the films so that the purified and stretched P(VDF-TrFE) films exhibited a small variation within 6% in the piezoelectric strain constant (d(33)) for 96 h at 70 degrees C. Ultrasonic transducers (UTs) were also fabricated with the purified and stretched P(VDF-TrFE) films. The pulse-echo measurement showed that the sensitivity and bandwidth of the UTs increased by 4.5 dB and decreased by 24.3%, respectively, compared to UTs fabricated with the purified P(VDF-TrFE) film without stretching. (C) 2018 Elsevier B.V. All rights reserved.
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Collections - College of Engineering > School of Mechanical Engineering > 1. Journal Articles
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