Article
Materials Science, Multidisciplinary
Mohammad Abshirini, Mrinal C. Saha, M. Cengiz Altan, Yingtao Liu
Summary: This work presents a novel approach to synthesize porous conductive polymer nanocomposites (CPNCs) with strain sensing capabilities by combining direct ink writing (DIW) and solvent evaporation induced phase separation. The resulting CPNCs exhibit a microscaled porous network structure, which is formed during the curing cycle induced by solvent evaporation and nonsolvent phase infiltration. The optimal formulation and printing conditions are identified to achieve high sensitivity and flexibility. The sensors made with the optimum conditions are then characterized for long-term piezoresistive applications.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Nanoscience & Nanotechnology
Mohammad Abshirini, Parisa Marashizadeh, Mrinal C. Saha, M. Cengiz Altan, Yingtao Liu
Summary: This study demonstrates the 3D printing of highly flexible, ultralightweight, and conductive polymer nanocomposites (CPNCs) with dual-scale porosity and piezoresistive sensing functions. The CPNC structures are achieved by designing structural printing patterns and utilizing phase separation of the polymer ink solution. The mechanical and piezoresistive behavior of the CPNC structures are explored by controlling the macro- and microscale porosity. The developed porous CPNCs show enhanced flexibility and sensitivity, and can be applied as piezoresistive sensors for detecting human motion.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Litao Huang, Jianwen Chen, Youquan Xu, Dengwen Hu, Xihua Cui, Dean Shi, Yutian Zhu
Summary: The study introduces a simple and efficient method for fabricating lightweight three-dimensional piezoresistive sensing materials through coating CNT/CB@PU sponge, which demonstrates high sensitivity, fast response, instant recovery, and stable characteristics for designing versatile piezoresistive sensors to detect various human motions.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Goncalo Fonseca, Joao Nunes-Pereira, Abilio P. Silva
Summary: This study presents a low-cost sensory glove system that enhances the functionality of a 3D-printed mechanical hand prosthesis by enabling touch detection, localization, and force measurement. The mechanical hand model was produced using 3D printing, allowing for quick and affordable production with the ability to replace individual parts easily. A complementary sensory mimicry add-on system was constructed and instrumented with piezoresistive sensors attached to the glove's palm, enabling the localization and quantification of forces exerted on the glove. This system has shown promising results and could serve as a platform for the development of a more complex and multifunctional system in the future.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Multidisciplinary
Yi-Fei Wang, Tomohito Sekine, Yasunori Takeda, Jinseo Hong, Ayako Yoshida, Daisuke Kumaki, Takeo Shiba, Shizuo Tokito
Summary: This study presents a method for manufacturing a fully printed pressure sensor using a porous conductive composite, which spontaneously forms a conductive structure in the printed ink, simplifying the fabrication process of flexible pressure sensors. The developed pressure sensors exhibit comprehensive performance capabilities suitable for wearable devices, human-machine interfaces, and robot tactile applications.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Materials Science, Multidisciplinary
Zhen Pei, Qiang Zhang, Kun Yang, Zhongyun Yuan, Wendong Zhang, Shengbo Sang
Summary: The developed 3D-printed wearable strain and tactile sensing array integrates flexible strain and pressure sensors with porous structures, providing a wide linear measurement range and continuous pressure monitoring ability for robotic perception.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Engineering, Electrical & Electronic
P. Ramya Priya, Satish Kumar Dubey, Sanket Goel
Summary: Respiratory rate (RR) and pattern evaluation are essential for evaluating the health status of individuals. A wearable and flexible breath monitoring sensor using laser-induced graphene (LIG) has been developed to analyze breathing patterns and RR. This sensor can be attached to a surgical mask to detect various diseases such as sleep apnea, asthma, and cardiac arrest.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Guohong Hu, Fengli Huang, Chengli Tang, Jinmei Gu, Zhiheng Yu, Yun Zhao
Summary: This study explored the application of microstructured dielectric layers printed by aerosol printing in optimizing the performance of flexible pressure sensors, showing that it could replace traditional inverted mold technology. The designed flexible pressure sensors demonstrated good performance in various tests.
Review
Materials Science, Multidisciplinary
Yuhuan Lv, Lizhen Min, Fengxiao Niu, Zhen Qin, Minghui Zhang, Biao Zhao, Yong Liu, Kai Pan
Summary: With the rapid development of industries such as Big Data and Internet of Things, flexible piezoresistive devices have gained significant attention. This paper provides a comprehensive overview of the most advanced developments in flexible piezoresistive sensors using multi-dimension conductive nanomaterials. Different types of nanomaterials, including 0D, 1D, and 2D, as well as hybrid combinations, are discussed in detail. The limitations and future perspectives for further development of flexible piezoresistive sensors are also addressed.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Construction & Building Technology
Dong Lu, Daiyu Wang, Jing Zhong
Summary: Traditionally, conductive fillers are mixed directly with cement matrix before binding with aggregates to develop piezoresistive cement-based sensors. This study proposes a strategy to construct a three-dimensional (3D) conductive network in the mortar with interfacial transition zone (ITZ) directly embedded in it, thus greatly increasing both the conductivity and piezoresistivity without significantly sacrificing mechanical property. Highly conductive graphene-coated fine aggregates (termed conductive G@FAg particles) are prepared and combined with carbon fibers to achieve outstanding electrical conductivity and selfsensing ability.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Materials Science, Multidisciplinary
Dong Xiang, Zixi Zhang, Yuanpeng Wu, Jiabin Shen, Eileen Harkin-Jones, Zhenyu Li, Ping Wang, Chunxia Zhao, Hui Li, Yuntao Li
Summary: In this study, flexible piezoresistive sensors were 3D-printed using conductive polymer composites of carbon nanotubes (CNTs) and graphite nanosheet (GNP) in thermoplastic polyurethane (TPU). The 75-CNT/25-GNP sensor showed superior sensing performance and stability compared to other sensors, with a higher linearity and gauge factor. The synergy between CNTs and GNPs in enhancing the sensing performance of piezoresistive sensors was clearly demonstrated.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Xinyi Li, Kangli Yang, Zhiqing Yuan, Shujuan Liu, Juan Du, Cancheng Li, Shoutong Meng
Summary: An effective and low-cost superhydrophobic coating was developed for printed circuit boards (PCBs) to solve the issue of water damage on electronic components. The coating exhibited excellent water resistance, stability against acid and alkali liquids, and showed potential for practical applications.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Engineering, Chemical
Wei Liu, Dechao Hu, Huaqing Liu, Wenshi Ma
Summary: A new reutilization strategy of waste printed circuit board nonmetal powders (WPCBP) was proposed to develop a superhydrophobic coating with excellent performance. The combination of WPCBP@SiO2 and PDMS successfully addressed the issue of reutilization of WPCBP, providing a green and efficient solution for the high-valued utilization of electronic waste.
POLYMER ENGINEERING AND SCIENCE
(2021)
Article
Chemistry, Analytical
Huixin Liu, Zhen Gu, Qing Zhao, Shuai Li, Xi Ding, Xinxin Xiao, Guangli Xiu
Summary: Wearable chemical sensors for monitoring ion concentration in sweat have attracted significant attention, however, the potential deviation of the ion-selective electrode (ISE) based potentiometric sensor after multiple uses remains a challenge. In this study, a easily prepared and highly integrated wearable solid contact-ISE (SC-ISE) is proposed, which allows for multiple measurements with repeatable open circuit potential (OCP) by applying a positive potential on the working electrode.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Review
Engineering, Environmental
Rao Fu, Xin Zhao, Xiaoyuan Zhang, Zhiqiang Su
Summary: This paper primarily focuses on the impact of nanomaterial dimensions on the performance of polymeric conductive composites (PCCs), particularly in terms of sensor quality. It also discusses the influence of different structure designs, such as 1D fiber, 2D laminar, and 3D network structures, on the sensing performance of strain sensors. Furthermore, the applications and challenges of wearable piezoresistive strain sensors are explored.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Kyoung-Ik Min, Seung-Woo Lee, Eun-Hee Lee, Yoon-Sik Lee, Hyunjung Yi, Dong-Pyo Kim
ADVANCED FUNCTIONAL MATERIALS
(2018)
Article
Chemistry, Multidisciplinary
Tae-Hyung Kang, Hochan Chang, Dongwon Choi, Soonwoo Kim, Jihee Moon, Jung Ah Lim, Ki-Young Lee, Hyunjung Yi
Article
Nanoscience & Nanotechnology
Sunho Kim, Jungwoo Kim, Daekyoung Kim, Bongsung Kim, Heeyeop Chae, Hyunjung Yi, Byungil Hwang
ACS APPLIED MATERIALS & INTERFACES
(2019)
Article
Nanoscience & Nanotechnology
Tae-Hyung Kang, Seung-Woo Lee, Kyowook Hwang, Wonbo Shim, Ki-Young Lee, Jung-Ah Lim, Woong-Ryeol Yu, In-Suk Choi, Hyunjung Yi
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Materials Science, Coatings & Films
Sunho Kim, Hyunho Lee, Daekyoung Kim, Heebo Ha, Nadeem Qaiser, Hyunjung Yi, Byungil Hwang
SURFACE & COATINGS TECHNOLOGY
(2020)
Article
Chemistry, Physical
Soonwoo Kim, Yein Lim, Tae-Hyung Kang, Jihee Moon, In-Suk Choi, Yun Jung Lee, Hyunjung Yi
ACS APPLIED ENERGY MATERIALS
(2020)
Article
Chemistry, Multidisciplinary
Hyoungjun Kim, Tae-Hyung Kang, Jongtae Ahn, Hyemi Han, Seongjin Park, Soo Jin Kim, Min-Chul Park, Seung-Ho Paik, Do Kyung Hwang, Hyunjung Yi, Jung Ah Lim
Article
Chemistry, Multidisciplinary
Soo Jin Kim, Jae-Seung Jeong, Ho Won Jang, Hyunjung Yi, Hoichang Yang, Hyunsu Ju, Jung Ah Lim
Summary: This study introduces a novel organic neurofiber transistor with improved memory cyclic endurance for spatiotemporal iterative learning. The transistor architecture and material enable stable memory characteristics and successful speech recognition with an accuracy of 88.9% through spiking neural network learning.
ADVANCED MATERIALS
(2021)
Article
Engineering, Biomedical
Tae Hyun Park, Seongjin Park, Seunggun Yu, Sangun Park, Junseok Lee, Sunho Kim, Youngmee Jung, Hyunjung Yi
Summary: A highly sensitive electronic skin sensor has been developed in this study, which can measure and visualize skin temperature simultaneously. The sensor uses a biocompatible hydrogel with thermoresponsive transparency and resistivity, allowing for temperature measurement across a wide range and visualization of temperature changes.
ADVANCED HEALTHCARE MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Junseok Lee, Seonjeong Kim, Seongjin Park, Jaesang Lee, Wonseop Hwang, Seong Won Cho, Kyuho Lee, Sun Mi Kim, Tae-Yeon Seong, Cheolmin Park, Suyoun Lee, Hyunjung Yi
Summary: This article reports an artificial tactile neuron that encodes material stiffness using spike frequency evolution patterns and achieves classification of breast tumor malignancy through learning based on a spiking neural network. It has high recognition accuracy and is significant for disease diagnosis and robot-assisted surgery with low power consumption and latency.
ADVANCED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Wonseop Hwang, Juhee Kim, Seongjin Park, Tae-Hyung Kang, Sunho Kim, Kijung Lee, Myoung-Gyu Lee, Rhokyun Kwak, In-Suk Choi, Hyunjung Yi
Summary: This article reports a simple strategy to achieve a versatile hybrid E-skin patch with great skin comfort. By developing a breathable and stretchable metastructure, the non-stretchable or stiff components and devices are integrated and tethered to the skin, ensuring both breathability and mechanical comfort. A wireless skin sensor system is also developed to enable event-driven wireless monitoring of ECG signals.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Multidisciplinary Sciences
Sangha Kim, Seongjin Park, Jina Choi, Wonseop Hwang, Sunho Kim, In-Suk Choi, Hyunjung Yi, Rhokyun Kwak
Summary: This article presents a sensory neuron-inspired epifluidic wireless patch that enables energy-efficient and long-term monitoring of sweat dynamics. The patch utilizes electrical spike patterns to decode and transmit sweat information in an event-driven manner, consuming low energy.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Kwang-Hun Choi, Soo Jin Kim, Hyoungjun Kim, Ho Won Jang, Hyunjung Yi, Min-Chul Park, Changsoon Choi, Hyunsu Ju, Jung Ah Lim
Summary: In this study, a fibriform electrochemical diode with rectifying, complementary logic, and device protection functions was fabricated for future e-textile circuit systems. The diode was made by twisting metal/polymer semiconductor/ion gel coaxial microfibers and conducting microfiber electrodes. The fibriform diode showed asymmetrical current flow and a rectification ratio of over 102, with retained performance after bending deformations and washings. Full-wave rectifiers and logic gate circuits were implemented by integrating the fibriform diodes, demonstrating AC-to-DC signal conversion and logic operation functions, respectively. The proposed fibriform diode also provided protection for low-voltage operational wearable e-textile circuits by suppressing transient voltages.
Article
Nanoscience & Nanotechnology
Hochan Chang, Sungwoong Kim, Sumin Jin, Seung-Woo Lee, Gil-Tae Yang, Ki-Young Lee, Hyunjung Yi
ACS APPLIED MATERIALS & INTERFACES
(2018)