• 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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News
A paper by project researcher Ayako Yoshida "Printed, all-carbon-based flexible humidity sensor using a cellulose nanofiber/graphene nanoplatelet composite" was published in Carbon Trends.

Award
Master's student Shogo Tachibana won the 2021 Outstanding Student Award. Congratulations!

News
Congratulations! Student Mayi Abe's master's thesis "Research on the Development of Thin-Film Soft Pressure Sensors with Pore Structures" won the Best Presentation Award.

Invited Lecture
Professor Tokito will give an invited presentation on "Flexible Printed Organic Sensors and Their IoT Applications" at IEEE EDTM2022 (Oita Prefecture) on March 8th (Tuesday).

Result
The paper "A Printed Flexible Humidity Sensor with High Sensitivity and Fast Response Using a Cellulose Nanofiber / Carbon Black Composite" by Assistant Professor Wang and second-year graduate student Shogo Tachibana was published in ACS Applied Materials & Interfaces.

Presentation
The ROEL Printed Device Technology Research Division will be exhibiting at the JFlex 2022 event (Tokyo Big Sight) from January 26 (Wed) to January 28 (Fri).

Result
Subhash Singh published a paper titled "Printed Dual-Gate Organic Thin-Film Transistors and PMOS Inverters on Flexible Substrates: Role of Top-Gate Electrode" with ROEL in the Journal of Physics D: Applied Physics.

Invited Lecture
Assistant Professor Wang's paper "Flexible printed temperature sensor with high humidity stability using bilayer passivation" was published in Flexible and Printed Electronics.

Lecture
November 25th (Thursday) to December 25th (Saturday): 60th Functional Paper Research Presentation / Web Lecture / Available at any time during this period  General Presentation by Professor Tokito on "Flexible Printed Electronics  for Healthcare and Medical Applications." 

Result
Associate Professor Nagamine's paper "Stable Immobilization of Mediator in Porous Carbon Material via a Capping Technique for Fabricating a Sensitive Enzyme-based Glucose Sensor" has been published in Sensors & Materials.

Result
Associate Professor Nagamine's paper "Organic-transistor-based biosensors interfaced with human skin for non-invasive perspiration analysis" has been published online in Sensors and Actuators: B. Chemical.

Result
The paper "Layout-to-Bitmap Conversion and Design Rules for Inkjet-Printed Large-Scale Integrated Circuits," joint research between ROEL and POSTECH in Korea, has been published in the journal Langmuir.

Result
A joint research paper "Single and dual-gate organic field-effect utilizing based on diketopyrrolopyrrole-diethienothiophene polymers: performance modulation via dielectric interfaces" was published in Materials Research Express.

Result
Assistant Professor Wang's paper "Deep Eutectic Solvent Induced Porous Conductive Composite for Fully Printed Piezoresistive Pressure Sensors" has been published in Advanced Materials Technologies.

News
In "Convertec 2021 Vol. 580 No. 49", on Electronics, issued July 15th, an article was published with the title, "Flexible Hybrid Electronics that Support IoT: Accumulation of Printing and Materials Technologies to Create FHE Sensors for Logistics Applications.

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【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

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