2022 Fiscal Year Final Research Report
Application of tranduducer power device develope by ultrasonic assisted hydrothermal method for Health and environmental monitoring sensor
| Project/Area Number |
19K04411
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 21030:Measurement engineering-related
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| Research Institution | Josai University |
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Principal Investigator |
Thithi Lay 城西大学, 理学部, 教授 (60807915)
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| Co-Investigator(Kenkyū-buntansha) |
森田 剛 東京大学, 大学院新領域創成科学研究科, 教授 (60344735)
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | KNbO3, / LiNbO3 / LiTaO3 / Lead-free Piezoelectric / Hydrothermal method / Piezoelectric properties / SEM, XRD / Optical properties |
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| Outline of Final Research Achievements |
Due to the growing awareness of environmental hazard and demand on new type of small-scale energy harvester, SAW device sensors, research goal was focused on synthesis of lead-free piezoelectric material from synthesis of thick PZT film for high power application by ultrasonic assisted hydrothermal method. In this research, KNbO3, LiNbO3 and LiTaO3 materials which has higher Curie temperature then PZT as well as high piezoelectric properties and optical properties. Well-ordered KNbO3 film was synthesized on LiNbO3 and LiTaO3 single crystal substrates by hydrothermal method. Simulation was also carried out to understand size effect and resonance frequency of synthesis films. 27μm thick KNbO3 film was synthesized on LiNbO3 single crystal substrate by single reaction for the first time. Piezoelectric properties and optical properties of synthesized film was evaluated by Laser Doppler Vibration (LDV) and Optical absorbance measurements. Measurement results showed prominent results.
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| Free Research Field |
非鉛圧電材料、バイオセンサー、エネルギーハーベスト
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| Academic Significance and Societal Importance of the Research Achievements |
ニオブ酸カリウム（KNbO3）は４３５℃付近にキュリー温度を持ち、電気機械結合係数が大きいことなどからPZTに代替の非鉛圧電材料として期待されている。しかしながら性質の良い（KNbO3）成膜の作製には基板材との密着性や生成における化学反応の安定性など難点がまだ残っている。これらの問題を解決するために今回（KNbO3）と同じ結晶構造を持ちキュリー温度がKNbO3より高く、光学的性質にも優れているLiNbO3とLiTaO3単結晶を基板としてKNbO3薄膜の生成を実施した。研究成果として一回の膜生成でLiNbO3基板上で約２７μmのKNbO3薄膜がはじめて得られたことは学術的及び社会的意義が大きい。
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