Research Achievements
Peer-reviewed Journal Publications
34) Tatsuya Yasuda, Ryutaro Komine, Ryoma Nojiri, Yoshihito Takabe, Kenta Nara, Takeru Kaneko, Syunsuke Horigome, Yasunori Takeda, Yi-Fei Wang, Seigou Kawaguchi *, Tomohito Sekine *
“Ultra-Rapidly Responsive Electret-Based Flexible Pressure Sensor via Functional Polymeric Nanoparticle Synthesis.
Advanced Functional Materials, 2024, 2402064.
33) Yi-Fei Wang *, Takeru Kaneko, Ayako Yoshida, Yasunori Takeda, Junya Yoshida, Tomohito Sekine, Daisuke Kumaki,
and Shizuo Tokito
“Facile printing of liquid-metal-based stretchable conductor using EGaIn/Ga2O3 composite”
Flexible and Printed Electronics, 2024, https://doi.org/10.1088/2058-8585/ad6333.
32) Yasunori Takeda *, Yi-Fei Wang, Ayako Yoshida, Tomohito Sekine, Daisuke Kumaki, Shizuo Tokito
“Advancing Robotic Gripper Control with the Integration of Flexible Printed Pressure Sensors”
Advanced Engineering Materials, 2024, Vol. 26, 2302031.
31) Hayato Komatsu, Yasunori Takeda, Yi-Fei Wang, Ayako Yoshida, Tomohito Sekine, Shizuo Tokito
"Printing pressure optimization in reverse offset printing for micrograting fabrication"
Japanese Journal of Applied Physics, 2024, Vol. 63, 020904.
30) Yi-Fei Wang *, Junya Yoshida, Yasunori Takeda, Ayako Yoshida, Takeru Kaneko, Tomohito Sekine, Daisuke Kumaki, Shizuo Tokito
Nanomaterials, 14, 63 (2023). DOI: 10.3390/nano14010063
29) Tomohito Sekine ⁎, Keita Ito, Yoshinori Shouji, Ryosuke Suga, Tatsuya Yasuda, Yi-Fei Wang, Yasunori Takeda, Daisuke Kumaki, Fabrice Domingues Dos Santos, Huang Tong, Atsushi Miyabo, Shizuo Tokito
“Robotic e-skin for high performance stretchable acceleration sensor via combinations of novel soft and functional polymers”
Applied Materials Today, 33, 101877 (2023). DOI: 10.1016/j.apmt.2023.101877
28) Takeru Kaneko, Yi-Fei Wang *, Mayuka Hori, Tomohito Sekine, Ayako Yoshida, Yasunori Takeda, Daisuke Kumaki, Shizuo Tokito *
“Printed Bilayer Liquid Metal Soft Sensors for Strain and Tactile Perception in Soft Robotics”
Advanced Materials Technologies, 2300436 (2023). DOI: 10.1002/admt.202300436
27) Yi-Fei Wang*, Ayako Yoshida, Yasunori Takeda, Tomohito Sekine, Daisuke Kumaki and Shizuo Tokito *
“Printed Directional Bending Sensor with High Sensitivity and Low Hysteresis for Human Motion Detection and Soft Robotic Perception”
Sensors, 23, 5041 (2023). DOI: 10.3390/s23115041
26) Kaiin Tou, Kenta Nara, Tomohito Sekine *, Yi‐Fei Wang, Yasunori Takeda, Daisuke Kumaki, Shizuo Tokito
“Micro‐Pore Composed Soft Pressure Sensor with Ether‐Surfactant via High‐Sensitivity in Wide Range for Robotic Machine Interface Application”
Advanced Sensor Research, 2300045 (2023). DOI: 10.1002/ADSR.202300045
25) Keita Ito, Tomohito Sekine *, Yoshinori Shouji, Yi-Fei Wang, Yasunori Takeda, Daisuke Kumaki, Fabrice Domingues Dos Santos, Huang Tong, Atsushi Miyabo and Shizuo Tokito
“Optimization of the blend ratio of soft functional polymers for high piezoelectric performance stretchable device”
Appl. Phys. Express, 16, 011004 (2023). DOI: 10.35848/1882-0786/ACB3AC
24) 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
“Fast Response, High-Power Tunable Ultrathin Soft Actuator by Functional Piezoelectric Material Composite for Haptic Device Application”
Advanced Electronic Materials, 2001040 (2023). DOI: 10.1002/AELM.202201040
23) Ayako Yoshida, Yi-Fei Wang *, Tomohito Sekine, Yasunori Takeda, Daisuke Kumaki, Shizuo Tokito *.
“Printed Low-Hysteresis Stretchable Strain Sensor Based on a Self-Segregating Conductive Composite”
ACS Appl. Eng. Mater, 1, 50-58 (2023). DOI: 10.1021/ACSAENM.2C00010
22) Ayako Yoshida, Yi-Fei Wang, Shogo Tachibana, Ayuka Hasegawa, Tomohito Sekine*, Yasunori Takeda, Jinseo Hong, Daisuke Kumaki, Takeo Shiba, Shizuo Tokito*.
“Printed, All-Carbon-Based Flexible Humidity Sensor Using a Cellulose Nanofiber/Graphene Nanoplatelet Composite”
Carbon Trends, 7, 100166 (2022). DOI: 10.1016/J.CARTRE.2022.100166
21) 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 *.
“Optimization of a Soft Pressure Sensor in terms of the Molecular Weight of the Ferroelectric-Polymer Sensing Layer”
Advanced Functional Materials, 32, 2107434 (2022). DOI: 10.1002/ADFM.202107434
20) Shogo Tachibana, Yi-Fei Wang *, Tomohito Sekine, Yasunori Takeda, Jinseo Hong, Ayako Yoshida, Daisuke Kumaki, Takeo Shiba, Shizuo Tokito *.
“A Printed Flexible Humidity Sensor with High Sensitivity and Fast Response Using a Cellulose Nanofiber/Carbon Black Composite”
ACS Appl. Mater. Interfaces, 14, 5721-5728 (2022). DOI: 10.1021/ACSAMI.1C20918
19) Yi‐Fei Wang *, Tomohito Sekine, Yasunori Takeda, Jinseo Hong, Ayako Yoshida, Daisuke Kumaki, Takeo Shiba, Shizuo Tokito *.
“Deep Eutectic Solvent Induced Porous Conductive Composite for Fully Printed Piezoresistive Pressure Sensor”
Advanced Materials Technologies. 6, 2100731 (2021). DOI: 10.1002/ADMT.202100731
18) Shogo Tachibana, Yi-Fei Wang *, Tomohito Sekine, Ayako Yoshida, Yasunori Takeda, ABE Mai, Reo Miura, Yushi Watanabe, Daisuke Kumaki, Shizuo Tokito *.
“Flexible printed temperature sensor with high humidity stability using bilayer passivation”
Flexible and Printed Electronics, 6, 034002 (2021). DOI: 10.1088/2058-8585/AC0FCE
17) 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 *.
“Artificial Cutaneous Sensing of Object Slippage using Soft Robotics with Closed-Loop Feedback Process”
Small Science, 1, 2100002 (2021). DOI: 10.1002/smsc.202100002
16) Tomohito Sekine *, Mai Abe, Kosuke Muraki, Shogo Tachibana, Yi-Fei Wang, Jinseo Hong, Yasunori Takeda, Daisuke Kumaki, Shizuo Tokito *.
“Microporous Induced Fully Printed Pressure Sensor for Wearable Soft Robotics Machine Interfaces”
Advanced Intelligent System. 2, 2000179 (2020). DOI: 10.1002/AISY.202000179
15) 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 *.
“Printed Soft Sensor with Passivation Layers for the Detection of Object Slippage by a Robotic Gripper”
Micromachines, 11, 927 (2020). DOI: 10.3390/MI11100927
14) Yi-Fei Wang *, Tomohito Sekine, Yasunori Takeda, Jinseo Hong, Ayako Yoshida, Hiroyuki Matsui, Daisuke Kumaki, Takao Nishikawa, Takeo Shiba, Tadahiro Sunaga, Shizuo Tokito.
“Printed Strain Sensor with High Sensitivity and Wide Working Range Using a Novel Brittle-Stretchable Conductive Network”
ACS Applied Materials and Interfaces, 12, 35282-35290 (2020). DOI: 10.1021/ACSAMI.0C09590
13) Yasunori Takeda *, Tomohito Sekine, Yi-Fei Wang, Tomoko Okamoto, Hiroyuki Matsui, Daisuke Kumaki, Shizuo Tokito *.
“High-Speed Complementary Integrated Circuit with a Stacked Structure Using Fine Electrodes Formed by Reverse Offset Printing”
ACS Appl. Electron. Mater. 2, 763-768 (2020). DOI: 10.1021/ACSAELM.9B00829
12) Yi-Fei Wang *, Tomohito Sekine, Yasunori Takeda, Koji Yokosawa, Hiroyuki Matsui, Daisuke Kumaki, Takeo Shiba, Takao Nishikawa, Shizuo Tokito *.
“Fully Printed PEDOT: PSS-based Temperature Sensor with High Humidity Stability for Wireless Healthcare Monitoring”
Scientific Reports, 10, 2467 (2020). (Top paper in 2020). DOI: 10.1038/S41598-020-59432-2
11) Jialing Pu, Tengzhou Yang *, Yi-Fei Wang, Qi Zhu, Mingcong Yang, Chuan Liu, Wenguang Wang *.
“Tunable self-organization in n-type liquid crystalline dibenzocoronene tetracarboxdiimides for high photoconductivity”
Liquid Crystal. 47, 291-300 (2020). DOI: 10.1080/02678292.2019.1645899
10) Jun Sato, Tomohito Sekine *, Yi-Fei Wang, Yasunori Takeda, Hiroyuki Matsui, Daisuke Kumaki, Fabrice Domingues Dos Santos, Atsushi Miyabo, Shizuo Tokito *.
“Ferroelectric polymer-based fully printed flexible strain rate sensors and their application for human motion capture”
Sensors and Actuators A: Physical, 295, 93-98 (2019). DOI: 10.1016/J.SNA.2019.05.022
9) Yi-Fei Wang, Hiroaki Iino, Jun-ichi Hanna *.
“Fabrication of planarly-oriented polycrystalline thin films of smectic liquid crystalline organic semiconductors”
Soft Matter, 13, 6499-6505 (2017). DOI: 10.1039/C7SM01303E
8) Yi-Fei Wang, Hiroaki Iino, Jun-ichi Hanna *.
“Planar orientation polycrystalline thin film of liquid crystalline organic semiconductor by template-directed self-assembly”
Applied Physics Express, 2017, 10, 101601. DOI: 10.7567/APEX.10.101601
7) Yi-Fei Wang, Hiroaki Iino, Jun-ichi Hanna *.
“Solution processed nanogap organic diode based on liquid crystal materials”
Applied Physics Letter, 111, 133301 (2017). DOI: 10.1063/1.4990672
6) Xingtian Hao, Chunxiu Zhang *, Jianchuang Wang, Wanying Zhang, Feng Hong, Shuaifeng Zhang, Ao Zhang, Huanzhi Yang, Zhenhu Zhang, Yifei Wang, Hao Wu, Jialing Pu.
“Competition and promotion of different mesophases in a series of novel unsymmetrical discotic dimers via subtle modification of spacers and peripheral side chains”
J. Mater. Chem. C, 5, 589-600 (2017). DOI: 10.1039/C6TC05120K
5) Jianchuang Wang, Chunxiu Zhang *, Shuaifeng Zhang, Xingtian Hao, Feng Hong, Ao Zhang, Yi-Fei Wang, Hao Wu, Wanying Zhang, Jia-Ling Pu.
“A systematic study on the influences of linkage length on phase behaviours and charge carrier mobilities of discotic dimers”
Liquid Crystals. 44, 394-404 (2017). DOI: 10.1080/02678292.2016.1213324
4) Shuaifeng Zhang, Chunxiu Zhang *, Jianchuang Wang, Feng Hong, Xingtian Hao, Ao Zhang, Yifei Wang, Hao Wu, Wanying Zhang, Jialing Pu.
“Systematic studies on structure–properties relationship of main chain discotic liquid crystalline polyethers: effects of the spacer lengths and substitution positions.”
Polym. Chem, 7, 3013-3025 (2016). DOI: 10.1039/C6PY00086J
3) Yi-Fei Wang, Chun-Xiu Zhang *, Hao Wu, Ao Zhang, Jian-Chuang Wang, Shuai-Feng Zhang, Jia-Ling Pu.
“Modulation of phase behaviors and charge carrier mobilities by linkage length in discotic liquid crystal dimers”
Soft Matter, 11, 712-718 (2015). DOI: 10.1039/C4SM02369B
2) Hao Wu, Chunxiu Zhang *, Jialing Pu, Yifei Wang.
“A convenient synthesis method of 3, 6-dihydroxy-2, 7, 10, 11-tetrapentyloxytriphenylene from 4, 4′-dihydroxybiphenyl with high yield”
Liquid Crystals, 41, 1173-1178 (2014). DOI: 10.1080/02678292.2014.909955
1) Yifei Wang, Chunxiu Zhang *, Hao Wu, Jialing Pu.
“Synthesis and mesomorphism of triphenylene-based dimers with highly ordered columnar plastic phase”
Journal of Materials Chemistry C, 2, 1667-1674 (2014). DOI: 10.1039/C3TC31986E
Conference Presentations
1. Yi-Fei Wang, Yasunori Takeda, Tomohito Sekine, Ayako Yoshida, Daisuke Kumaki, and Shizuo Tokito.
“Printed Flexible Tactile Sensor Array for Robotic Closed-loop Control”.
The 83rd JSAP Autumn Meeting 2022, 22a-C105-8
Tohoku University, Sendai, Japan, September 20-23, 2022.
2. Yi-Fei Wang, Yasunori Takeda, Tomohito Sekine, Daisuke Kumaki, and Shizuo Tokito.
“Fully Printed Flexible Pressure Sensor with a Spontaneously Formed Porous Conductive Architecture”.
2022 MRS Spring Meeting, SB02.14.04
Online, May 23-25, 2022.
3. Yi-Fei Wang, Yasunori Takeda, Tomohito Sekine, Daisuke Kumaki, and Shizuo Tokito.
“Fully Printed Flexible Pressure Sensors Using a Deep Eutectic Solvent Induced Porous Conductive Composite”.
The 69th JSAP Spring Meeting, 2022, 22p-E307-4
Online, March 22-26, 2022
4. Yi-Fei Wang
“Printing Technologies for Flexible and Stretchable Electronics”.
2nd Event of the Young Researchers Society for Flexible and Stretchable Electronics (FSE), Invited tutorial lecture.
Online, June 15-16, 2021.
5. Yi-Fei Wang, Shizuo Tokito.
“Flexible Printed Sensors: From Fundamental Study to Practical Applications”.
6th International Conference on Nanoscience and Nanotechnology (ICONN2021),
Invited speaker
Online, Feberaury 1-3, 2021.
6. Yi-Fei Wang, Tomohito Sekine, Yasunori Takeda, Kosuke Muraki, Mai Abe, Daisuke Kumaki, Jun Okabe, Tadahiro Sunaga, Shizuo Tokito.
“Screen printed highly sensitive piezoresistive strain sensor with broad sensing range for human motion monitoring and robotic sensing”.
The 80th JSAP Autumn Meeting, 18p-B12-14
Hokkaido University, Sapporo, Japan, September 18-21, 2019.
7. Yi-Fei Wang, Tomohito Sekine, Koji Yokosawa, Hiroyuki Matsui, Daisuke Kumaki, Takeo Shiba and Shizuo Tokito.
“Printed temperature sensor based on PEDOT:PSS”.
The 79th JSAP Autumn Meeting, 19a-211A-5
Nagoya congress center, Nagoya, Japan, September 18-21, 2018.
8. Yi-Fei Wang, Hiroaki Iino, Jun-ichi Hanna.
“Fabrication of planarly-oriented polycrystalline thin films of smectic liquid crystalline organic semiconductors”.
The 65th JSAP Spring Meeting, 18p-G205-5
WASEDA University, Tokyo, Japan, March 17-20, 2018.
9. Yi-Fei Wang, Hiroaki Iino, Jun-ichi Hanna.
“Fabrication of Parallel-aligned Polycrystalline Thin Films via Liquid Crystals”.
Japanese Liquid Crystal Conference 2015, 3B08
Tokyo Institute of Technology, Yokohama, Japan, September 7-9, 2015.
10. Yi-Fei Wang, Hiroaki Iino, Jun-ichi Hanna.
“Fabrication of Planar-aligned Polycrystalline Thin Films by Liquid Crystals”.
Imaging Conference JAPAN 2015 Fall Meeting, Poster (PA02)
Kyoto Institute of Technology, Kyoto, Japan. November 19-20, 2015.
11. Yi-Fei Wang, Wen-Guang Wang, Chun-Xiu Zhang, Jia-Ling Pu.
“Molecular design of discotic liquid crystal with high charge mobility”.
2nd international symposium on self-organizing molecular semiconductors, Poster (P-9)
Tokyo Institute of Technology, Tokyo, Japan, February 27-28, 2014. 国際会議
Patents in application
1) 竹田泰典、時任静士、ワン イーフェイ
柔らかさ測定装置、柔らかさ測定方法、ロボット把持部の把持力制御装置、ロボット制御装置、ロボット、及びロボット把持部の把持力制御用プログラム
日本，特願2023-013635，2022-12-05，特許出願
A Japanese patent on stiffness sensor and robot feedback control system
2) 吉田綾子、ワン イーフェイ、時任静士
フレキシブル感圧センサ
日本，特願2022-147950，2022-09-12，特許出願
A Japanese patent on printed flexible pressure sensor
3) 吉田綾子、ワン イーフェイ、時任静士
嚥下運動評価用抵抗型歪みセンサ
日本，特願2022-088653，2022-05-18，特許出願
A Japanese patent on strain sensor for monitoring the human swallowing behavior
4) 吉田綾子、ワン イーフェイ、時任静士
湿度センサ
日本，特願2021-088262，2021-03-15，特許出願
A Japanese patent on printed flexible humidity sensor
5) 吉田綾子、ワン イーフェイ、時任静士
導電性樹脂及びその製造方法並びにセンサ
日本，特願2020-197319，2020-09-02，特許出願
A Japanese patent on new composite materials for printed flexible pressure sensor
6) 吉田綾子、ワン イーフェイ、時任静士
多孔質樹脂及びその製造方法並びに機能フィルム
日本，特願2020-197318，2020-09-02，特許出願
A Japanese patent on new porous composite
7) Chunxiu Zhang, Hao Wu, Mingxia Zhang, Yifei Wang, Jialing Pu
Triphenylene dimers chiral discotic liquid crystal compound and its preparation method
CHINA, CN103484129B, 2016-04-13, patent authorized.
A Chinese patent on synthesis of discotic liquid crystal materials
8) Jialing Pu, Yifei Wang, Chunxiu Zhang, Hao Wu, Mingxia Zhang
Synthesis of triphenylene-based discotic liquid crystal dimers
CHINA, CN104418714A, 2015-03-18, patent application.
A Chinese patent on synthesis of discotic liquid crystal dimers