Development of the flexible heat protection circuits for bio medical applications

• Project/Area Number: 15K20961
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Electron device/Electronic equipment; Structural/Functional materials
• Research Institution: The University of Tokyo
• Principal Investigator: Yokota Tomoyuki 東京大学, 大学院工学系研究科(工学部), 講師 (30723481)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: フレキシブルエレクトロニクス / 温度センサ / フレキシブルデバイス / プリンテッドエレクトロニクス / 有機トランジスタ

Outline of Final Research Achievements

In this project, we developed the flexible temperature sensor by mixing the acrylate co polymer and graphite as a conductive filler. A temperature sensor shows 6 orders of magnitude change in resistivity near the temperature of a human skin.
And also, we evaluated the heat protection characteristics by integration the organic thin film transistors (OTFTs) and temperature sensor. The ON current of the OTFTs is decreased as temperature is higher. We confirmed the high performance of temperature sensor as heat protection circuits.

Research Products

• [Journal Article] Ultraflexible, large-area, physiological temperature sensors for multipoint measurements (2015)
  • Author(s): Tomoyuki Yokota, Yusuke Inoue, Yuki Terakawa, Jonathan Reeder, Martin Kaltenbrunner, Taylor Ware, Kejia Yang, Kunihiko Mabuchi, Tomohiro Murakawa, Masaki Sekino, Walter Voit, Tsuyoshi Sekitani, and Takao Someya
  • Journal Title: Proceedings of the National Academy of Sciences of the United States of America Volume: 112 Issue: 47 Pages: 14533-14538
  • DOI: 10.1073/pnas.1515650112
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] Printable and ultra-flexible temperature sensor based on polymer (2016)
  • Author(s): Tomoyuki Yokota, Takao Someya
  • Organizer: ICEP 2016
  • Place of Presentation: 札幌市教育文化会館 札幌
  • Year and Date: 2016-04-20
  • Int'l Joint Research / Invited
• [Presentation] Printable ultra-flexible temperature sensor for thermal mapping of bio-tissue (2016)
  • Author(s): Tomoyuki Yokota, Jonathan Reeder, Yusuke Inoue, Yuki Terakawa, Taylor Ware, Walter Voit, Masaki Sekino and Takao Someya
  • Organizer: 2016 MRS spring
  • Place of Presentation: フェニックス アメリカ
  • Year and Date: 2016-04-03
  • Int'l Joint Research