Tokito-Kumaki-Sekine Laboratory

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Laboratory Research Domains

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Organic Semiconductor Materials, Devices & Circuits

Developing new p-type and n-type organic semiconductor materials in collaboration with industry companies, fabricating and characterizing OTFT devices and circuits using synthesized inks and printing methods such as the inkjet method.
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Flexible and Stretchable Printed Physical Sensors

Developing physical sensors that are printable, flexible, and highly sensitive. Objective is to realize sensors suitable for robots and healthcare by manufacturing flexible sensors and stretchable sensors that detect stress generated by pressure, bending, and tension.
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Flexible Hybrid Electronics

Prototyping hybrid (FHE) sensors that are wearable and combine the flexibility of organic electronics with the high performance and functionality of Si-LSI while wirelessly transmitting sensor data.
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Ultra-Fine Printing Technologies

Developing conductive inks suitable for use with reverse-offset printing, evaluating the functionality of OTFT electrodes and interconnects through printing experiments, and developing integrated circuit manufacturing processes.
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Development of the Metal Nanoparticle Ink

Developing low-temperature sintered metal nanoparticle inks to improve the performance of printed TFT devices, with advanced particle designs and ink technology to reduce interconnect layer widths and the energy barrier with the semiconductor layer.
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Large-Area Sensor Technologies

Developing large-area sensors that can continuously and unobtrusively measure vital signals such as heartbeat and respiration, and body movements. Thin, flexible sensors easily installable in beds, and employable in elderly care facilities or home care settings.
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Robotic Sensing Technologies

Mounting flexible sensors on the robotic gripper hand, building a system linked with IoT networks to significantly improve safety and work efficiency, and create new application fields. By adding a tactile function to the grip, its gripping force can be controlled.
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New papers

Assistant Professor Sekine and second-year Master's program graduate student Yushi Watanabe published "Optimization of a Soft Pressure Sensor in Terms of the Molecular Weight of the Ferroelectric-Polymer Sensing Layer" in Advanced Functional Materials, and was selected for the cover picture.

Congratulations!Assistant Professor Wang's paper "Fully Printed PEDOT:PSS-based Temperature Sensor with High Humidity Stability for Wireless Healthcare Monitoring" is one of the Top 100 Materials Science Papers Downloaded in 2020 by Scientific Reports.

A paper related to Assistant Professor Sekine about the tactile soft sensor for slip sensing was published in Small Science as an Inside Front Cover.

Feb. 28, 2023: February 22, 2023 (Wed.), at a webinar Soft Sensing Investments Collaboration Consortium, was held online. Associate Professor Ushi Nakajima, Associate Professor of Applied Physics, Tokyo University of Science, gave a seminar on "Functional properties of high molecular molecules and applicants as IoT Devices.”
Feb. 07, 2023: One of the technical themes that ROEL exhibited at JFLEX 2023, "Application of his gripper grip control system for flexible printed pressure sensors," was published in the electronic version of the Nikkan Kogyo Shimbun on February 7, entitled, "Yamagata University, Printing of Sensors for Temperature/ Gripping Force Detection.”
Feb. 06, 2023: Our lab participated in the JFLEX Exhibition (Tokyo Big Sight) held from Feb. 1st (Wed.) to Feb. 3rd (Fri.), 2023 as "ROEL Printed Device Technology Research Division”.
Jan. 26, 2023: At 10:00 p.m. on January 25, WBS (TV Tokyo) introduced the Organic Electronics Research Center of Yamagata University, which is participating in the 9th Wearable EXPO exhibition. Included was a sheet-type sensor that can monitor human vital sign information unobtrusively.
Jan. 26, 2023: On February 17 (Friday), Prof. Tokito will give an invited lecture, "Research and Development and Application Development of Flexible Printed Organic Sensors," at the Applied Organic Molecular Bioelectronics Subcommittee (Microsoft Teams & local hybrid event).
Nov. 18, 2022: We will exhibit at the JFlex Exhibition (Tokyo Big Sight) from February 1st (Wednesday) to February 3rd (Friday), 2023, as the "ROEL Printed Device Technology Research Division.”
Nov. 17, 2022: At the 18th Color Inkjet Technology (IT) Course on December 20, 2022 (Tuesday) 13:20-14:10, Professor Tokito will deliver an invited lecture on "Research and Development and Application Development of Flexible Printing Organic Sensors." The event will also be held online.
Nov. 10, 2022: Professor Tokito will deliver an invited lecture 'Research and Development Progress and Applications for Flexible Printed Organic Sensors' at the 18th Color Inkjet Technology (IT) Course on December 20, 2022 (Tuesday) 13:20-14:10. The program will also be held online.
Sep. 01, 2022: A paper titled "Printed Low-Hysteresis Stretchable Strain Sensor Based on a Self-Segregating Conductive Composite" by Ms. Ayako Yoshida, a project researcher, was published in ACS Applied Engineering Materials.
Jul. 08, 2022: Project Researcher Ayako Yoshida's paper "Printed Low-Hysteresis Stretchable Strain Sensor Based on a Self-Segregating Conductive Composite" has been accepted by ACS Applied Engineering Materials.
May 23, 2022: On Friday, June 3rd, there will be a research presentation by Assistant Professor Takeda at the Robotics and Mechatronics Lecture 2022 in Sapporo (online), "Tactile Function of Robot Hand Using Printable Flexible Pressure Sensor Array" (2P2-C12 *).
May 23, 2022: Assistant Professor Wang's research presentation “Fully Printed Flexible Pressure Sensor with a Spontaneously Formed Porous Conductive Architecture” will be presented at The 2022 MRS Spring Meeting & Exhibit (Virtual) on May 24th (Tuesday).
May 23, 2022: On May 24th (Tuesday), Assistant Professor Sekine's research presentation "Object Slippage Detection using Soft Sensor with Robotic Closed-Loop Feedback" will be held at The 2022 MRS Spring Meeting & Exhibit (Virtual).
May 23, 2022: On May 24th (Tuesday), Professor Tokito will give an invited presentation, "Flexible Printed Organic Sensors and Their Applications," at The 2022 MRS Spring Meeting & Exhibit (Virtual).
May 11, 2022: Assistant Professor Sekine and second-year Master's program graduate student Yushi Watanabe published "Optimization of a Soft Pressure Sensor in Terms of the Molecular Weight of the Ferroelectric-Polymer Sensing Layer" in Advanced Functional Materials, and was selected for the cover picture.

More NEWS More RESEARCH RESULTS

【Tokito, Office】
4-3-16 Jonan, Yonezawa, Yamagata
992-8510, JAPAN
YAMAGATA UNIVERSITY
Research Center for Organic Electronics (Bldg. 10)
Phone：+81-238-26-3725
Fax：+81-238-26-3788