Kumaki 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

Netherland-Japan Joint Workshop -Creating the Future Electronics-was held on September 2, 2024 and was featured in the Yamagata newspaper.

We are exhibiting at CEATEC 2024 (Makuhari Messe). We look forward to welcoming you.

[Notice] The 2nd Yamagata University Soft Sensing Industry-Academia Collaboration Consortium Research Meeting will be held on Thursday, December 12, 2024, at the Station Conference Tokyo. Detailed program information and registration methods will be announced on our website at a later date.

Nov. 13, 2024: TNO Holst Centre and Yamagata Univ. conclude a comprehensive partnership agreement, which was featured on NHK News.
Oct. 15, 2024: We are exhibiting at CEATEC 2024 (Makuhari Messe). We look forward to welcoming you.
Oct. 08, 2024: [Notice] The 2nd Yamagata University Soft Sensing Industry-Academia Collaboration Consortium Research Meeting will be held on Thursday, December 12, 2024, at the Station Conference Tokyo. Detailed program information and registration methods will be announced on our website at a later date.
Oct. 02, 2024: We will be exhibiting at CEATEC 2024, held at Makuhari Messe.
Sep. 04, 2024: Netherland-Japan Joint Workshop -Creating the Future Electronics-was held on September 2, 2024 and was featured in the Yamagata newspaper.
Jul. 25, 2024: The 1st Yamagata University Soft Sensing Industry-Academia Collaboration Consortium Research Symposium was held.
Mar. 06, 2024: We issued a press release regarding the collaborative research results between our laboratory and Sanyo Chemical Industries, Ltd. on a ‘strain sensor using a stretchable UV-curable resin (Strultech),’ which was featured in over 8 newspapers, including the Chemical Industry Daily and The Nikkei. For an overview of the joint research, please refer to this link.
Feb. 17, 2024: A paper titled 'Advancing Robotic Gripper Control with the Integration of Flexible Printed Pressure Sensors' authored by Project Associate Professor Yasunori Takeda and Project Assistant Professor Yi-Fei Wang, has been published in Advanced Engineering Materials (IF: 3.6).
Feb. 17, 2024: A paper titled 'printing pressure optimization in reverse offset printing for micrograting fabrication' authored by Doctoral Course student Hayato KOMATSU and Project Associate Professor Yasunori Takeda, has been published in Japanese Journal of Applied Physics (IF: 1.5).
Feb. 02, 2024: We showcased our latest results on printed flexible sensors at 'WELL-BEING TECHNOLOGY 2024' held at Tokyo Big Sight from January 31, 2024. Thank you to everyone who visited our booth.
Jan. 07, 2024: A paper titled 'Printed Composite Film with Microporous/ Micropyramid Hybrid Conductive Architecture for Multifunctional Flexible Force Sensor' authored by Project Assistant Professor Yi-Fei Wang and B4 student Junya Yoshida, has been published in Nanomaterials (IF: 5.3).
Jan. 07, 2024: A paper titled 'Blood Oxygen and Heart Rate Monitoring by a Flexible Hybrid Electronics Device Fabricated by Multilayer Screen-Printing,' authored by Project Associate Professor Ayako Yoshida, has been published in Advanced Electronics Materials (IF: 6.2).
Dec. 24, 2023: A paper titled 'Printed Composite Film with Microporous/ Micropyramid Hybrid Conductive Architecture for Multifunctional Flexible Force Sensor' by Project Assistant Professor Yi-Fei Wang and B4 student Junya Yoshida, has been accepted by Nanomaterials (IF: 5.3).
Dec. 01, 2023: Our research on the Printed FHE (Flexible Hybrid Electronics) SpO2 sensor received the Best Poster Award at the MRS 2023 Fall Meeting (Boston, USA).
Nov. 29, 2023: On November 29th, 2023, Project Assistant Professor Yi-Fei Wang delivered a talk titled 'Advancing High-Performance Printed Soft Mechanical Sensors Through Microstructure Control of Conductive Composites' at the MRS 2023 Fall Meeting in Boston, US.

More NEWS More RESEARCH RESULTS

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