Graduate School of Organic Materials Science, Yamagata University

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Published Paper

  1. Ag Nanoparticle Ink for High‐Resolution Printed Electrodes and Organic Thin‐Film Transistors Using Reverse‐Offset Printing
    Yamato Suzuki, Daisuke Kumaki, Taichi Kikkawa, Toshiki Yoshioka, Shunsuke Horigome, Yasunori Takeda, Tomohito Sekine, Shizuo Tokito*
    Advanced Electronic Materials, vol. 10, pp: 2400546 (2024).
    https://onlinelibrary.wiley.com/doi/10.1002/aelm.202400546
  2. Facile printing of liquid?metal-based stretchable conductor using EGaIn/Ga2O3 composite
    Yi-Fei Wang, Takeru Kaneko, Ayako Yoshida, Yasunori Takeda, Junya Yoshida, Tomohito Sekine, Daisuke Kumaki, Shizuo Tokito*
    Flexible and Printed Electronics, vol. 9, pp: 035004-035004 (2024).
    https://iopscience.iop.org/article/10.1088/2058-8585/ad6333
  3. Ultra‐Rapidly Responsive Electret‐Based Flexible Pressure Sensor via Functional Polymeric Nanoparticle Synthesis
    Tatsuya Yasuda, Ryutaro Komine, Ryoma Nojiri, Yoshihito Takabe, Kenta Nara, Takeru Kaneko, Syunsuke Horigome, Yasunori Takeda, Yi‐Fei Wang, Seigou Kawaguchi*, Tomohito Sekine*
    Advanced Functional Materials 2024年7月10日
  4. Development of printed X-ray grating and its application to an imaging system
    Hayato Komatsu, Wataru Yashiro, Xiaoyu Liang, Ayako Yoshida, Yasunori Takeda, Tomohito Sekine, Daisuke Kumaki, Shizuo Tokito*
    Japanese Journal of Applied Physics 2024年3月14日
  5. Advancing Robotic Gripper Control with the Integration of Flexible Printed Pressure Sensors
    Yasunori Takeda, Yi‐Fei Wang, Ayako Yoshida, Tomohito Sekine, Daisuke Kumaki, Shizuo Tokito*
    Advanced Engineering Materials 2024年2月22日
  6. Printing pressure optimization in reverse offset printing for micrograting fabrication
    Hayato Komatsu, Yasunori Takeda, Yi-Fei Wang, Ayako Yoshida, Tomohito Sekine, Shizuo Tokito
    Japanese Journal of Applied Physics 63(2) 020904-020904 2024年2月15日
  7. Printed Composite Film with Microporous/Micropyramid Hybrid Conductive Architecture for Multifunctional Flexible Force Sensors
    Yi-Fei Wang, Junya Yoshida, Yasunori Takeda, Ayako Yoshida, Takeru Kaneko, Tomohito Sekine, Daisuke Kumaki, Shizuo Tokito
    Nanomaterials 14(1) 63-63 2023年12月25日
  8. Unobstructive Heartbeat Monitoring of Sleeping Infants and Young Children Using Sheet-Type PVDF Sensors
    Daisuke Kumaki, Yuko Motoshima, Fujio Higuchi, Katsuhiro Sato, Tomohito Sekine, Shizuo Tokito
    Sensors 23(22) 9252-9252 2023年11月17日
  9. Robotic e-skin for high performance stretchable acceleration sensor via combinations of novel soft and functional polymers
    Tomohito Sekine, Keita Ito, Yoshinori Shouji, Ryosuke Suga, Tatsuya Yasuda, Yi-Fei Wang, Yasunori Takeda, Daisuke Kumaki, Fabrice Domingues Dos Santos, Huan g Tong, Atsushi Miyabo, Shizuo Tokito a , b
    Applied Materials Today 33 101877 2023年7月
  10. Printed Bilayer Liquid Metal Soft Sensors for Strain and Tactile Perception in Soft Robotics
    Takeru Kaneko, Yi‐Fei Wang, Mayuka Hori, Tomohito Sekine, Ayako Yoshida, Yasunori Takeda, Daisuke Kumaki, Shizuo Tokito
    Advanced Materials Technologies 2023年6月9日
  11. Printed Directional Bending Sensor with High Sensitivity and Low Hysteresis for Human Motion Detection and Soft Robotic Perception
    Yi-Fei Wang, Ayako Yoshida, Yasunori Takeda, Tomohito Sekine, Daisuke Kumaki, Shizuo Tokito
    Sensors 23(11) 5041-5041 2023年5月24日
  12. Micro‐Pore Composed Soft Pressure Sensor with Ether‐Surfactant via High‐Sensitivity in Wide Range for Robotic Machine Interface Application
    Kaiin Tou, Kenta Nara, Tomohito Sekine, Yi‐Fei Wang, Yasunori Takeda, Daisuke Kumaki, Shizuo Tokito
    Advanced Sensor Research 2023年4月27日
  13. Fast Response, High‐Power Tunable Ultrathin Soft Actuator by Functional Piezoelectric Material Composite for Haptic Device Application
    Yoshinori Shouji, Tomohito Sekine, Keita Ito, Naoya Ito, Tatsuya Yasuda, Yi‐Fei Wang, Yasunori Takeda, Daisuke Kumaki, Fabrice Domingues Dos Santos, Atsushi Miyabo, Shizuo Tokito
    Advanced Electronic Materials 2201040-2201040 2023年1月29日
  14. Optimization of the blend ratio of soft functional polymers for high piezoelectric performance stretchable device
    Keita Ito, Tomohito Sekine, Yoshinori Shouji, Yi-Fei Wang, Yasunori Takeda, Daisuke Kumaki, Fabrice Domingues Dos Santos, Huang Tong, Atsushi Miyabo, Shizuo Tokito
    Applied Physics Express 16(1) 011004-011004 2023年1月1日
  15. Bottom gate top contact organic transistors using thiophene and furan flanked diketopyrrolopyrrole polymers and its comparative study
    Thu-Trang Do, Yasunori Takeda, Tomohito Sekine, Yogesh Yadav, Sergei Manzhos, Krishna Feron, Samarendra P Singh, Shizuo Tokito, Prashant Sonar
    Flexible and Printed Electronics 7(3) 035014-035014 2022年9月1日
  16. Printed Low-Hysteresis Stretchable Strain Sensor Based on a Self-Segregating Conductive Composite
    Ayako Yoshida, Yi-Fei Wang, Tomohito Sekine, Yasunori Takeda, Daisuke Kumaki, Shizuo Tokito
    ACS Applied Engineering Materials 1(1) 50-58 2022年8月23日
  17. Printed, all-carbon-based flexible humidity sensor using a cellulose nanofiber/graphene nanoplatelet composite
    Ayako Yoshida, Yi-Fei Wang, Shogo Tachibana, Ayuka Hasegawa, Tomohito Sekine, Yasunori Takeda, Jinseo Hong, Daisuke Kumaki, Takeo Shiba, Shizuo Tokito
    Carbon Trends 7 100166-100166 2022年4月
  18. Optimization of a Soft Pressure Sensor in Terms of the Molecular Weight of the Ferroelectric‐Polymer Sensing Layer
    Yushi Watanabe, Tomohito Sekine, Reo Miura, Mai Abe, Yoshinori Shouji, Keita Ito, Yi‐Fei Wang, Jinseo Hong, Yasunori Takeda, Daisuke Kumaki, Fabrice Domingues Dos Santos, Atsushi Miyabo, Shizuo Tokito
    Advanced Functional Materials 32(16) 2107434-2107434 2022年4月
  19. A Printed Flexible Humidity Sensor with High Sensitivity and Fast Response Using a Cellulose Nanofiber/Carbon Black Composite
    Shogo Tachibana, Yi-Fei Wang, Tomohito Sekine, Yasunori Takeda, Jinseo Hong, Ayako Yoshida, Mai Abe, Reo Miura, Yushi Watanabe, Daisuke Kumaki, Shizuo Tokito
    ACS Applied Materials & Interfaces 14(4) 5721-5728 2022年2月2日
  20. Deep Eutectic Solvent Induced Porous Conductive Composite for Fully Printed Piezoresistive Pressure Sensor
    Yi‐Fei Wang, Tomohito Sekine, Yasunori Takeda, Jinseo Hong, Ayako Yoshida, Daisuke Kumaki, Takeo Shiba, Shizuo Tokito
    Advanced Materials Technologies 6(12) 2100731-2100731 2021年12月
  21. Flexible printed temperature sensor with high humidity stability using bilayer passivation
    Shogo Tachibana, Yi-Fei Wang, Tomohito Sekine, Ayako Yoshida, Yasunori Takeda, Mai Abe, Reo Miura, Yushi Watanabe, Daisuke Kumaki, Shizuo Tokito
    Flexible and Printed Electronics 6(3) 034002-034002 2021年9月1日
  22. Evaluation of leakage current and leakage path of gate-insulating layer used in organic thin-film transistors under mechanical loading
    Koji Hidaka, Masaaki Koganemaru, Tomohito Sekine, Nobuyuki Shishido, Shoji Kamiya, Takeo Minari, Toru Ikeda, Shizuo Tokito
    Journal of Japan Institute of Electronics Packaging 24(6) 586-594 2021年9月1日
  23. Flexible and Printed Organic Nonvolatile Memory Transistor with Bilayer Polymer Dielectrics
    Woojo Kim, Jimin Kwon, Yasunori Takeda, Tomohito Sekine, Shizuo Tokito, Sungjune Jung
    Advanced Materials Technologies 2100141-2100141 2021年5月14日
  24. Artificial Cutaneous Sensing of Object Slippage using Soft Robotics with Closed‐Loop Feedback Process
    Tomohito Sekine, Yi-Fei Wang, Jinseo Hong, Yasunori Takeda, Reo Miura, Yushi Watanabe, Mai Abe, Yoshiki Mori, Zhongkui Wang, Daisuke Kumaki, Fabrice Domingues Dos Santos, Atsushi Miyabo, Sadao Kawamura, Shizuo Tokito
    Small Science 1(3) 2100002-2100002 2021年3月
  25. Printed Electronics-Enabled Wearable/Portable Physical and Chemical Sensors for Personal Digital Healthcare
    Kuniaki Nagamine, Tomohito Sekine, Shizuo Tokito
    Encyclopedia of Sensors and Biosensors 68-79 2021年
  26. Fully Printed PEDOT:PSS-based Temperature Sensor with High Humidity Stability for Wireless Healthcare Monitoring
    Yi-Fei Wang, Tomohito Sekine, Yasunori Takeda, Koji Yokosawa, Hiroyuki Matsui, Daisuke Kumaki, Takeo Shiba, Takao Nishikawa, Shizuo Tokito
    Scientific Reports 10(1) 2020年12月
  27. Microporous Induced Fully Printed Pressure Sensor for Wearable Soft Robotics Machine Interfaces
    Tomohito Sekine, Mai Abe, Kosuke Muraki, Shogo Tachibana, Yi-Fei Wang, Jinseo Hong, Yasunori Takeda, Daisuke Kumaki, Shizuo Tokito
    Advanced Intelligent Systems 2(12) 2000179-2000179 2020年12月
  28. Printed Soft Sensor with Passivation Layers for the Detection of Object Slippage by a Robotic Gripper
    Reo Miura, Tomohito Sekine, Yi-Fei Wang, Jinseo Hong, Yushi Watanabe, Keita Ito, Yoshinori Shouji, Yasunori Takeda, Daisuke Kumaki, Fabrice Domingues Dos Santos, Atsushi Miyabo, Shizuo Tokito
    Micromachines 11(10) 927-927 2020年10月8日
  29. Reduced Threshold Voltages and Enhanced Mobilities in Diketopyrrolopyrrole?Dithienothiophene Polymer‐Based Organic Transistor by Interface Engineering
    Basanagouda B. Patil, Yasunori Takeda, Thu Trang Do, Amandeep Singh, Tomohito Sekine, Soniya D. Yambem, Shizuo Tokito, Samarendra P. Singh, Ajay K. Pandey, Prashant Sonar
    physica status solidi (a) 217(19) 2000097-2000097 2020年10月
  30. Printed Strain Sensor with High Sensitivity and Wide Working Range Using a Novel Brittle?Stretchable Conductive Network
    Yi-Fei Wang, Tomohito Sekine, Yasunori Takeda, Jinseo Hong, Ayako Yoshida, Hiroyuki Matsui, Daisuke Kumaki, Takao Nishikawa, Takeo Shiba, Tadahiro Sunaga, Shizuo Tokito
    ACS Applied Materials & Interfaces 12(31) 35282-35290 2020年8月5日
  31. High-Speed Complementary Integrated Circuit with a Stacked Structure Using Fine Electrodes Formed by Reverse Offset Printing
    Yasunori Takeda, Tomohito Sekine, Yi-Fei Wang, Tomoko Okamoto, Hiroyuki Matsui, Daisuke Kumaki, Shizuo Tokito
    ACS Applied Electronic Materials 2(3) 763-768 2020年3月24日
  32. A multidimensional scheme of characterization for performance deterioration behavior of flexible devices under bending deformation
    Shoji Kamiya, Hayato Izumi, Tomohito Sekine, Nobuyuki Shishido, Hiroko Sugiyama, Yasuko Haga, Takeo Minari, Masaaki Koganemaru, Shizuo Tokito
    Thin Solid Films 694 137613-137613 2020年1月
  33. Ferroelectric polymer-based fully printed flexible strain rate sensors and their application for human motion capture
    Jun Sato, Tomohito Sekine, Wang Yi-Fei, Yasunori Takeda, Hiroyuki Matsui, Daisuke Kumaki, Fabrice Domingues Dos Santos, Atsushi Miyabo, Shizuo Tokito
    Sensors and Actuators A: Physical 295 93-98 2019年8月
  34. Printed low-voltage-operating organic thin-film transistors using high-k and paraelectric polymers
    Tomohito Sekine, Tomoya Tashiro, Yasunori Takeda, Daisuke Kumaki, Fabrice Domindues Dos Santos, Atsushi Miyabo, Shizuo Tokito
    Japanese Journal of Applied Physics 58(8) 080906-080906 2019年8月1日
  35. Synthesis and Deformable Hierarchical Nanostructure of Intrinsically Stretchable ABA Triblock Copolymer Composed of Poly(3-hexylthiophene) and Polyisobutylene Segments
    Tomoya Higashihara, Seijiro Fukuta, Yuto Ochiai, Tomohito Sekine, Keisuke Chino, Tomoyuki Koganezawa, Itaru Osaka
    ACS Applied Polymer Materials 1(3) 315-320 2019年3月8日
  36. Low Operating Voltage and Highly Pressure-Sensitive Printed Sensor for Healthcare Monitoring with Analogic Amplifier Circuit
    Tomohito Sekine, Alexandre Ga??tis, Jun Sato, Kohei Miyazawa, Kosuke Muraki, Rei Shiwaku, Yasunori Takeda, Hiroyuki Matsui, Daisuke Kumaki, Fabrice Domingues Dos Santos, Atsushi Miyabo, Mica?l Charbonneau, Shizuo Tokito
    ACS Applied Electronic Materials 1(2) 246-252 2019年2月26日
  37. An Organic FET with an Aluminum Oxide Extended Gate for pH Sensing
    Tsukuru Minamiki, Tomohito Sekine, Michio Aiko, Shiwei Su, Tsuyoshi Minami
    Sensors and Materials 31(1) 99-99 2019年1月15日
  38. A Fully Printed Ultra-Thin Charge Amplifier for On-Skin Biosignal Measurements
    Mika-Matti Laurila, Shizuo Tokito, Matti Mantysalo, Hiroyuki Matsui, Rei Shiwaku, Mikko Peltokangas, Jarmo Verho, Karem Lozano Montero, Tomohito Sekine, Antti Vehkaoja, Niku Oksala
    IEEE Journal of the Electron Devices Society 7 566-574 2019年
  39. Fully Printed Wearable Vital Sensor for Human Pulse Rate Monitoring using Ferroelectric Polymer
    Tomohito Sekine, Ryo Sugano, Tomoya Tashiro, Jun Sato, Yasunori Takeda, Hiroyuki Matsui, Daisuke Kumaki, Fabrice Domingues Dos Santos, Atsushi Miyabo, Shizuo Tokito
    Scientific Reports 8(1) 2018年12月
  40. Printed Organic Complementary Inverter with Single SAM Process Using a p-type D-A Polymer Semiconductor
    Yasunori Takeda, Tomohito Sekine, Rei Shiwaku, Tomohide Murase, Hiroyuki Matsui, Daisuke Kumaki, Shizuo Tokito
    Applied Sciences 8(8) 1331-1331 2018年8月9日
  41. Switching Time in Ferroelectric Organic Field‐Effect Transistors
    Ryo Sugano, Tomoya Tashiro, Tomohito Sekine, Hiroyuki Matsui, Daisuke Kumaki, Fabrice Domingues Dos Santos, Atsushi Miyabo, Shizuo Tokito
    physica status solidi (a) 215(11) 1701059-1701059 2018年6月
  42. Morphological Behavior of Printed Silver Electrodes with Protective Self-Assembled Monolayers for Electrochemical Migration
    Tomohito Sekine, Jun Sato, Yasunori Takeda, Daisuke Kumaki, Shizuo Tokito
    ACS Applied Materials & Interfaces 10(18) 16210-16215 2018年5月9日
  43. Organic Complementary Inverter Circuits Fabricated with Reverse Offset Printing
    Yasunori Takeda, Yudai Yoshimura, Rei Shiwaku, Kazuma Hayasaka, Tomohito Sekine, Tomoko Okamoto, Hiroyuki Matsui, Daisuke Kumaki, Yoshinori Katayama, Shizuo Tokito
    Advanced Electronic Materials 4(1) 1700313-1700313 2018年1月
  44. Development of a silver nanoparticle ink for fine line patterning using gravure offset printing
    Shiokawa Daisuke, Izumi Konami, Sugano Ryo, Sekine Tomohito, Minami Tsuyoshi, Kumaki Daisuke, Tokito Shizuo
    Jpn. J. Appl. Phys. 56(5S2) 05EA04-05EA04 2017年5月1日
  45. Mechanical Fatigue Behavior of Flexible Printed Organic Thin-Film Transistors under Applied Strain
    Tomohito Sekine, Daisuke Kumaki, Shizuo Tokito
    Materials 10(1) 18-18 2016年12月28日
  46. Ultrathin flexible memory devices based on organic ferroelectric transistors
    Ryo Sugano, Yoshinori Hirai, Tomoya Tashiro, Tomohito Sekine, Kenjiro Fukuda, Daisuke Kumaki, Fabrice Domingues dos Santos, Atsushi Miyabo, Shizuo Tokito
    Japanese Journal of Applied Physics 55(10S) 10TA04-10TA04 2016年10月1日
  47. Fully printed and flexible ferroelectric capacitors based on a ferroelectric polymer for pressure detection
    Tomohito Sekine, Ryo Sugano, Tomoya Tashiro, Kenjiro Fukuda, Daisuke Kumaki, Fabrice Domingues Dos Santos, Atsushi Miyabo, Shizuo Tokito
    Japanese Journal of Applied Physics 55(10S) 10TA18-10TA18 2016年10月1日
  48. The effect of mechanical strain on contact resistance in flexible printed organic thin-film transistors
    Tomohito Sekine, Kenjiro Fukuda, Daisuke Kumaki, Shizuo Tokito
    Flexible and Printed Electronics 1(3) 035005-035005 2016年9月1日
  49. Free-Standing Organic Transistors and Circuits with Sub-Micron Thicknesses
    Kenjiro Fukuda, Tomohito Sekine, Rei Shiwaku, Takuya Morimoto, Daisuke Kumaki, Shizuo Tokito
    Scientific Reports 6(1) 2016年7月
  50. Enhanced memory characteristics in organic ferroelectric field-effect transistors through thermal annealing
    Ryo Sugano, Tomoya Tashiro, Tomohito Sekine, Kenjiro Fukuda, Daisuke Kumaki, Shizuo Tokito
    AIP Advances 5(11) 117106-117106 2015年11月
  51. Enhanced adhesion mechanisms between printed nano-silver electrodes and underlying polymer layers
    Tomohito Sekine, Kenjiro Fukuda, Daisuke Kumaki, Shizuo Tokito
    Nanotechnology 26(32) 321001-321001 2015年8月14日
  52. Highly stable flexible printed organic thin-film transistor devices under high strain conditions using semiconducting polymers
    Tomohito Sekine, Kenjiro Fukuda, Daisuke Kumaki, Shizuo Tokito
    Japanese Journal of Applied Physics 54(4S) 04DK10-04DK10 2015年4月1日
  53. Fully-printed high-performance organic thin-film transistors and circuitry on one-micron-thick polymer films
    Kenjiro Fukuda, Yasunori Takeda, Yudai Yoshimura, Rei Shiwaku, Lam Truc Tran, Tomohito Sekine, Makoto Mizukami, Daisuke Kumaki, Shizuo Tokito
    Nature Communications 5(1) 2014年9月
  54. Improvement of mechanical durability on organic TFT with printed electrodes prepared from nanoparticle ink
    Tomohito Sekine, Hideaki Ikeda, Akifumi Kosakai, Kenjiro Fukuda, Daisuke Kumaki, Shizuo Tokito
    Applied Surface Science 294 20-23 2014年3月
  55. An extended-gate type organic field effect transistor functionalised by phenylboronic acid for saccharide detection in water
    Tsuyoshi Minami, Tsukuru Minamiki, Yuki Hashima, Daisuke Yokoyama, Tomohito Sekine, Kenjiro Fukuda, Daisuke Kumaki, Shizuo Tokito
    Chem. Commun. 50(98) 15613-15615 2014年
  56. Strain sensitivity and durability in p-type and n-type organic thin-film transistors with printed silver electrodes
    Kenjiro Fukuda, Kenta Hikichi, Tomohito Sekine, Yasunori Takeda, Tsukuru Minamiki, Daisuke Kumaki, Shizuo Tokito
    Scientific Reports 3(1) 2013年12月
  57. Profile Control of Inkjet Printed Silver Electrodes and Their Application to Organic Transistors
    Kenjiro Fukuda, Tomohito Sekine, Daisuke Kumaki, Shizuo Tokito
    ACS Applied Materials & Interfaces 5(9) 3916-3920 2013年5月8日
  58. Patterning Method for Silver Nanoparticle Electrodes in Fully Solution-Processed Organic Thin-Film Transistors Using Selectively Treated Hydrophilic and Hydrophobic Surfaces
    Kenjiro Fukuda, Yasunori Takeda, Yu Kobayashi, Masahiro Shimizu, Tomohito Sekine, Daisuke Kumaki, Masato Kurihara, Masatomi Sakamoto, Shizuo Tokito
    Japanese Journal of Applied Physics 52(5S1) 05DB05-05DB05 2013年5月1日
  59. Organic integrated circuits using room-temperature sintered silver nanoparticles as printed electrodes
    Kenjiro Fukuda, Tomohito Sekine, Yu Kobayashi, Yasunori Takeda, Masahiro Shimizu, Naoya Yamashita, Daisuke Kumaki, Mitsunori Itoh, Minami Nagaoka, Takami Toda, Sayaka Saito, Masato Kurihara, Masatomi Sakamoto, Shizuo Tokito
    Organic Electronics 13(12) 3296-3301 2012年12月
  60. Stable organic thin-film transistors using full solution-processing and low-temperature sintering silver nanoparticle inks
    Kenjiro Fukuda, Tomohito Sekine, Yu Kobayashi, Daisuke Kumaki, Mitsunori Itoh, Minami Nagaoka, Takami Toda, Sayaka Saito, Masato Kurihara, Masatomi Sakamoto, Shizuo Tokito
    Organic Electronics 13(9) 1660-1664 2012年9月
  61. Applied Voltage Dependence of Carbon Radical in Electric Double Layer Capacitor Measured by in situ ESR Spectroscopy and AC Cyclic Voltammetry
    ITO Tomohiro, KOBAYASHI Masakatsu, YOSHIDA Mayumi, SEKINE Tomohito, TACHIBANA Kazuhiro, NISHINA Tatsuo, OGATA Tateaki
    Electrochemistry 78(5) 390-392 2010年