Article
Materials Science, Multidisciplinary
Huayu Luo, Gaoyang Pang, Kaichen Xu, Zhiqiu Ye, Huayong Yang, Geng Yang
Summary: The fully printed flexible trimodal sensor sheet integrates pressure, temperature, and proximity sensor units, with a sophisticated structure that is easy to fabricate and can suppress crosstalk and mutual interference, providing dual-level detection capability and saving power consumption.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Engineering, Multidisciplinary
Igor Zhilyaev, Nitesh Anerao, Ajay Giri Prakash Kottapalli, Mahmut Cihat Yilmaz, Mustafa Murat, Mostafa Ranjbar, Anastasiia Krushynska
Summary: This study proposes the concept of artificial wings with a periodic pattern, inspired by metamaterials, and explores how the pattern geometry can be used to control the aerodynamic and acoustic characteristics of a wing. The results confirm the feasibility of metamaterial patterns to control the dynamics of flapping flight and can open new perspectives for applications of 3D-printed patterned wings.
BIOINSPIRATION & BIOMIMETICS
(2022)
Article
Materials Science, Multidisciplinary
Marc Alique, Claudia Delgado Simao, Gonzalo Murillo, Ana Moya
Summary: Recent advancements in materials and manufacturing processes have enabled the development of printed piezoelectric materials for use as flexible sensors, actuators, and generators. Key focus is on the lightweight, flexible, and high throughput manufacturing capabilities, providing disruptive advantages in integration technologies and cost-effective applications. However, challenges remain in the production of reliable flexible printed piezoelectric devices, with limitations mainly stemming from the production and processing of piezoelectric inks.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Materials Science, Multidisciplinary
Kirill Keller, Christoph Leitner, Christian Baumgartner, Luca Benini, Francesco Greco
Summary: We present the fabrication of a fully printed, lead-free, polymer piezoelectric transducer and demonstrate the characterization of its structural, dielectric, and ferroelectric properties at different processing stages. The performance of the transducer made with poly(vinylidene fluoride-trifluoroethylene) is evaluated through resonance frequency analyses, acoustic power measurements, and pulse-echo experiments. Importantly, we demonstrate an optimal performance in the medical ultrasound range (<15 MHz) with acoustic power >1 W cm(-2) for the first time in a fully printed transducer, which shows promise for applications in epidermal and wearable electronics. Overall, these findings lay a strong foundation for future research in the field of flexible ultrasound transducers.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Ruben Alcala, Monica Materano, Patrick D. Lomenzo, Pramoda Vishnumurthy, Wassim Hamouda, Catherine Dubourdieu, Alfred Kersch, Nicolas Barrett, Thomas Mikolajick, Uwe Schroeder
Summary: Ferroelectric hafnium-zirconium oxide is a promising material for next-generation non-volatile memory devices, but its performance reliability needs improvement. This study investigates the impact of different electrodes on the reliability metrics of endurance, retention, and imprint for Hf-Zr-based ferroelectric capacitors. It is found that the low reactivity of the electrode with the ferroelectric is crucial for improving device reliability. This understanding of interface properties will contribute to the development of next-generation memories.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Christos K. Mytafides, Lazaros Tzounis, George Karalis, Petr Formanek, Alkiviadis S. Paipetis
Summary: This study successfully fabricated a fully printed carbon nanotube-based Thermoelectric Generator (TEG) with excellent flexibility and remarkable power output, capable of operating at high temperatures up to 350 degrees C. The TEG device, easily manufactured through low-cost ink printing processes, exhibited remarkable power factors on high-temperature resistant substrates, along with exceptional stability in air. The produced TEG showed high thermoelectric performance in the field of carbon-based and printed thermoelectric devices, with the potential for large-scale manufacturing opportunities.
JOURNAL OF POWER SOURCES
(2021)
Article
Engineering, Electrical & Electronic
Yi Chiu, You-Zen Chen, Chia-Chun Hsieh, Hao-Chiao Hong
Summary: This paper presents a relative pressure sensor fabricated using standard industrial flexible printed circuit board (FPCB) technology, allowing wireless pressure measurement. The sensor with an open sensing cavity design has higher frequency sensitivity, enabling pressure measurement with higher resolution.
IEEE SENSORS JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Wenru Li, Changhao Li, Guangzu Zhang, Linkai Li, Kai Huang, Xuetian Gong, Chao Zhang, An Zheng, Yanxue Tang, Zhengzhi Wang, Qiaoling Tong, Wen Dong, Shenglin Jiang, Sulin Zhang, Qing Wang
Summary: Although molecular ferroelectrics exhibit excellent dielectric, piezoelectric, and pyroelectric properties, their applications in devices are limited due to their tendency to fracture under mechanical loading. This study presents a self-powered flexible mechanical sensor, capable of detecting various mechanical forces and demonstrating high stability.
ADVANCED MATERIALS
(2021)
Article
Computer Science, Information Systems
Jianfeng Zheng, Xiaopeng Sun, Haixiang Zhou, Chenyang Tian, Hao Qiang
Summary: This study proposes a PCB defect detection method based on neural networks, and experimental results show an average recognition accuracy of 92.86% for four types of defects, outperforming other models.
Article
Computer Science, Hardware & Architecture
Tianyang Gai, Tong Qu, Shuhan Wang, Xiaojing Su, Renren Xu, Yun Wang, Jing Xue, Yajuan Su, Yayi Wei, Tianchun Ye
Summary: In this article, a new end-to-end hotspot detector based on a fully convolutional network is proposed, which has the flexibility of detecting multiple hotspots in a layout of any size at once. Moreover, a transfer learning scheme is developed to reduce the requirement of sample number when setting up a new model. The experimental results demonstrate the outstanding performance of the proposed hotspot detector and the effectiveness of the transfer learning scheme.
IEEE TRANSACTIONS ON COMPUTER-AIDED DESIGN OF INTEGRATED CIRCUITS AND SYSTEMS
(2022)
Article
Automation & Control Systems
Xenofon Karagiorgis, Gaurav Khandelwal, Ajay Beniwal, Radu Chirila, Peter J. Skabara, Ravinder Dahiya
Summary: This study presents a fully 3D printed capacitive pressure sensor using polydimethylsiloxane (PDMS) foam as the dielectric layer. The poly(3,4-ethylenedioxythiophene):polystyrene sulfonate and silver nanowire electrodes provide exceptional flexibility and electrical properties. The optimized device shows about 30% higher sensitivity compared to PDMS-based sensors. Furthermore, the sensors offer good repeatability and fast response/recovery times. The sensors are evaluated for underwater pressure monitoring and touch-based object recognition.
ADVANCED INTELLIGENT SYSTEMS
(2023)
Article
Chemistry, Analytical
Surya A. Singaraju, Dennis D. Weller, Thurid S. Gspann, Jasmin Aghassi-Hagmann, Mehdi B. Tahoori
Summary: This study demonstrates the feasibility of fully printed artificial neuromorphic circuits on flexible substrates, providing a promising candidate for future applications in smart wearable sensors.
Article
Polymer Science
A. M. R. Ramirez, M. A. del Valle, E. Ortega, F. R. Diaz, M. A. Gacitua
Summary: In this study, electrodes modified with polypyrrole nanowires with a diameter of 30 nm were successfully obtained through electrochemical methods. The analysis of their electrochemical, spectroscopic, and morphological properties revealed that the nanowire structure can significantly enhance the specific capacitance and stability of the capacitors.
Article
Engineering, Electrical & Electronic
Qifan Ding, Huyue Chen, Jiahao Wu, Tianxiang Zheng, Wen-Ming Zhang, Lei Shao
Summary: In this paper, a molding-free full-printing method for flexible tactile sensors was proposed and verified. The method offers a fast, low-cost, and reliable way to fabricate sensors with performance comparable or even better than those made with slow and expensive molding processes. The sensors show high sensitivity for low pressures and can detect a wide pressure range. The method also allows for the fabrication of diverse flexible devices.
IEEE SENSORS JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Li Li, Jingsai Cheng, Yunyun Cheng, Ting Han, Yang Liu, Yao Zhou, Guanghui Zhao, Yan Zhao, Chuanxi Xiong, Lijie Dong, Qing Wang
Summary: This study reports the incorporation of low-K Cd1-xZnxSe1-ySy nanodots into a ferroelectric polymer, resulting in significant increases in K and E-b of polymer composites and outperforming current dielectric materials. The observed dielectric enhancement is attributed to structural changes induced by the nanodot fillers, including transformation of polymer chain conformation and induced interfacial dipoles, as confirmed by density functional theory calculations. This work provides a new experimental route to scalable high-energy-density polymer dielectrics and advances the fundamental understanding of dielectric behavior at atomistic scales.
ADVANCED MATERIALS
(2021)
Article
Multidisciplinary Sciences
Sungjun Park, Soo Won Heo, Wonryung Lee, Daishi Inoue, Zhi Jiang, Kilho Yu, Hiroaki Jinno, Daisuke Hashizume, Masaki Sekino, Tomoyuki Yokota, Kenjiro Fukuda, Keisuke Tajima, Takao Someya
Article
Chemistry, Multidisciplinary
Zhi Jiang, Kenjiro Fukuda, Wenchao Huang, Sungjun Park, Roda Nur, Md Osman Goni Nayeem, Kilho Yu, Daishi Inoue, Masahiko Saito, Hiroki Kimura, Tomoyuki Yokota, Shinjiro Umezu, Daisuke Hashizume, Itaru Osaka, Kazuo Takimiya, Takao Someya
ADVANCED FUNCTIONAL MATERIALS
(2019)
Article
Nanoscience & Nanotechnology
Sunghoon Lee, Daisuke Sasaki, Dongmin Kim, Mami Mori, Tomoyuki Yokota, Hyunjae Lee, Sungjun Park, Kenjiro Fukuda, Masaki Sekino, Katsuhisa Matsuura, Tatsuya Shimizu, Takao Someya
NATURE NANOTECHNOLOGY
(2019)
Article
Chemistry, Multidisciplinary
Hiroki Kimura, Kenjiro Fukuda, Hiroaki Jinno, Sungjun Park, Masahiko Saito, Itaru Osaka, Kazuo Takimiya, Shinjiro Umezu, Takao Someya
ADVANCED MATERIALS
(2019)
Article
Multidisciplinary Sciences
Zhi Jiang, Fanji Wang, Kenjiro Fukuda, Akchheta Karki, Wenchao Huang, Kilho Yu, Tomoyuki Yokota, Keisuke Tajima, Thuc-Quyen Nguyen, Takao Someya
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Review
Chemistry, Physical
Kenjiro Fukuda, Kilho Yu, Takao Someya
ADVANCED ENERGY MATERIALS
(2020)
Article
Chemistry, Physical
Ruiyuan Liu, Masahito Takakuwa, Ailong Li, Daishi Inoue, Daisuke Hashizume, Kilho Yu, Shinjiro Umezu, Kenjiro Fukuda, Takao Someya
ADVANCED ENERGY MATERIALS
(2020)
Article
Multidisciplinary Sciences
Fei Qin, Wen Wang, Lulu Sun, Xueshi Jiang, Lin Hu, Sixing Xiong, Tiefeng Liu, Xinyun Dong, Jing Li, Youyu Jiang, Jianhui Hou, Kenjiro Fukuda, Takao Someya, Yinhua Zhou
NATURE COMMUNICATIONS
(2020)
Article
Materials Science, Multidisciplinary
Zhi Jiang, Kilho Yu, Haoyang Wang, Steven Rich, Tomoyuki Yokota, Kenjiro Fukuda, Takao Someya
Summary: An integrated flexible photodetector with FET and OPD modules achieves ultralow dark current density and ultrahigh detectivity, amplifying the photoplethysmogram signal intensity from the OPD module by a factor of approximately 10.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Review
Chemistry, Multidisciplinary
Tomoyuki Yokota, Kenjiro Fukuda, Takao Someya
Summary: Flexible image sensors are gaining attention as new imaging devices due to their lightness, softness, and bendability. They offer high-accuracy continuous biometric information measurement directly attached to curved surfaces like skin, with potential applications in wearable devices and home medical care. The individual components, performance evaluation parameters, and real-world measurement cases of these sensors in the biomedical field are discussed.
ADVANCED MATERIALS
(2021)
Article
Multidisciplinary Sciences
Hiroaki Jinno, Tomoyuki Yokota, Mari Koizumi, Wakako Yukita, Masahiko Saito, Itaru Osaka, Kenjiro Fukuda, Takao Someya
Summary: The integration of ultraflexible optical sensors with power sources faces challenges due to the insufficient air operational stability of polymer light-emitting diodes. However, by combining air-operation-stable polymer light-emitting diodes, organic solar cells, and organic photodetectors, a self-powered organic optical system for photoplethysmogram monitoring has been developed. This system demonstrates high linearity and stability, making it suitable for long-term health monitoring applications.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Akihiro Maeda, Ruiyuan Liu, Kilho Yu, Shinyoung Lee, Kyohei Nakano, Masahito Takakuwa, Shipei Zhang, Keisuke Tajima, Kenjiro Fukuda, Shinjiro Umezu, Takao Someya
Summary: Recent progress in organic photovoltaics (OPVs) emphasizes the importance of laboratory-scale fabrication in ambient air using solution processes. However, the effect of the existence of both ambient air and light during the formation of a photoactive layer on the performance of fabricated devices has not been fully elucidated. It was found that photoactive layer formation in completely dark conditions enables air-processable OPVs with a high power conversion efficiency, highlighting the impact of light and air coexistence on device performance.
JOURNAL OF PHYSICS-MATERIALS
(2021)
Article
Biochemical Research Methods
Takashi Ohya, Haruki Ohtomo, Tetsutaro Kikuchi, Daisuke Sasaki, Yohei Kawamura, Katsuhisa Matsuura, Tatsuya Shimizu, Kenjiro Fukuda, Takao Someya, Shinjiro Umezu
Summary: Human induced pluripotent stem (iPS) cell-derived cardiomyocytes are widely used for in vitro pharmacological and pathological studies. A novel simultaneous measurement system using 500 nm-thick flexible electronic sheets was developed for contractile force and extracellular field potential assessment of iPS cell-derived cardiac cell sheet-tissues. It was confirmed that this system is applicable for pharmacological studies and assessments of excitation-contraction coupling-related parameters. Flexible electronics with cardiac tissue engineering provide an advanced platform for drug development and gaining new insight in pharmacological study of human cardiac function.
Review
Chemistry, Multidisciplinary
Steven I. Rich, Zhi Jiang, Kenjiro Fukuda, Takao Someya
Summary: With the advancement of the Internet of Things and wearable computing, electronics have become increasingly essential in daily life. Traditional electronics, with their rigid angular nature, have faced challenges in integrating with curved surfaces. In recent years, efforts have been made to fabricate electronics on curved surfaces, showing the potential of curved electronics.
MATERIALS HORIZONS
(2021)
Article
Materials Science, Multidisciplinary
Tsukuru Minamiki, Tsuyoshi Minami, Yi-Pu Chen, Taisei Mano, Yasunori Takeda, Kenjiro Fukuda, Shizuo Tokito
Summary: The integration of organic thin-film transistors and biosensors is promising for daily health management, with molecular recognition chemistry-based design crucial for obtaining accurate and reproducible sensing signals. These results offer guidelines for the development of effective healthcare tools.
COMMUNICATIONS MATERIALS
(2021)
