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- 2019
- Topological change
- Multi-hop routing
- low latency
- Wearable Wireless Sensor Network
- wearable devices
- Communication Engineering
- Shenyang Ligong University
- Northeastern University
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Flexible and Ultrasensitive Piezoelectric Composites Based on Highly (00l)‐Assembled BaTiO <sub/>3</sub> Microplatelets for Wearable Electronics Application
摘要： Piezoelectric wearable electronics with flexibility and high sensitivity have received increasing attention in the fields of health monitoring, flexible robots, and artificial intelligence. Here, a flexible organic–inorganic hybrid composite for wearable electronics application based on (00l)-aligned BaTiO3 (BT) single-crystal microplatelets is prepared by layer-by-layer self-assembly technology. For the polyvinylidene fluoride-trifluoroethylene (P(VDF-TrFE))/BT single-crystal microplatelets composite film, the sensitivity is nearly 20 times higher than that of its counterparts of P(VDF-TrFE)/BT microparticles composite film and pure P(VDF-TrFE) film. The orderly alignment of BT microplatelets also has been found advantageous to the strength of the composite film. The tensile strength is up to 204.3 MPa even at a high inorganic phase content of 53.8 wt% in P(VDF-TrFE)/BT single-crystal microplatelets composite film, which is four times that of pure P(VDF-TrFE) film. Moreover, the flexible piezoelectric wearable device based on P(VDF-TrFE)/BT single-crystal microplatelets film effectively provides detailed information for monitoring human activities such as pronunciation, frequency, and waveform of pulse beating, and motion states. This high sensitivity, high strength, and flexible piezoelectric composite provides much potential on the applications of wearable equipments and health monitoring devices.
关键词： organic–inorganic hybrids,wearable sensors,flexible piezoelectric composites,BaTiO3
更新于2025-11-21 11:01:37
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Ultra-flexible perovskite solar cells with crumpling durability: toward a wearable power source
摘要： Perovskite materials hold great potential as photovoltaic power sources for portable devices owing to their mechanical flexibility and high performance; however, the flexibility and e?ciency require further improvement to attain practical viability. We investigated the mechanical fracture behavior of polycrystalline perovskite films by varying the substrate thickness and applying the neutral plane concept. This enabled us to fabricate a crack-free perovskite film on an ultra-thin substrate (B2.5 mm) and to demonstrate ultra-flexible solar cells with high e?ciency (17.03%) with unprecedented flexibility sustained after 10 000 cycles of bending at a 0.5 mm radius. This represents a high e?ciency of 13.6% for large-area flexible perovskite solar cells (1.2 cm2), fabricated by using a hybrid transparent electrode composed of a metal mesh grid and conducting polymer. Using a protective layer to achieve the neutral plane concept, our ultra-flexible perovskite solar cells are demonstrated to be durable even after 100 crumpling cycles. Our approach paves the way to fabricate flexible perovskite solar cells for portable power sources.
关键词： wearable power source,Perovskite solar cells,mechanical durability,neutral plane concept,flexible
更新于2025-11-21 10:59:37
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Large-scale fabrication of highly elastic conductors on a broad range of surfaces
摘要： Recently, a great stretchability progress has been witnessed in elastic electronics. However, such electronics are either costly, toxic, or cannot pattern on a broad range of substrates which limit their large-scale fabrications and applications. Here, to overcome those limitations, an ink comprising liquid metal particles and desirable polymer solutions is developed. The polymer solutions in our ink can be adjusted to print on different surfaces and avoid toxic organic solvents in most cases. The ink can be sintered by small strain (~10%) in room temperature. Using our ink, conductors with high stretchability (380,000 S/m at a strain of 1000%) can be printed in low consumption (liquid metal consumption 3.27 mg/cm2), in large area (bestrew entire surface of a T-shirt) and in high throughputs (~105 cm2 per hour). The ink can be printed on a T-shirt to achieve a smart wearable platform that integrates electronics for strain/electrophysiology/electrochemistry detection, and temperature monitoring/controlling.
关键词： Stretchable conductors,wearable devices,low-cost,liquid metal,large-scale fabrication,printable electronics
更新于2025-11-14 15:19:41
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[IEEE 2018 IEEE Biomedical Circuits and Systems Conference (BioCAS) - Cleveland, OH, USA (2018.10.17-2018.10.19)] 2018 IEEE Biomedical Circuits and Systems Conference (BioCAS) - Like Kleenex for Wearables: A soft, strong and disposable ECG monitoring system
摘要： Although electrocardiography (ECG) monitoring systems have been available in the form of wearable patches for the better part of two decades, they are limited in their ability to be utilized as inexpensive, yet vital short-term measurement devices that are (truly) completely disposable. Advancing current practices in soft conformable electronics, we present a Bluetooth-enabled, fully disposable single-lead ECG patch comprising ink-jet printed Ag-AgCl electrodes and components integrated on a single, flexible hybrid printed circuit board with an average current consumption of 3.6 mA from a 3.0 V stack of four flexible Lithium polymer batteries. As part of the Live Demonstration, our goals are to showcase the patch’s functionality including real-time continuous ECG display and fall detection, and the flexible enclosures and adhesives conferring its unique softness, strength and disposability following a 7-day lifespan.
关键词： Wearable,Printed Electrodes,Disposable,Real-time ECG,Flexible Hybrid PCB
更新于2025-09-23 15:23:52
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Fundamental Study on Blood Pressure Measurement by FBG Sensor
摘要： In recent years, the demands for vital sign measurement system have been increasing, such as home health care for elderly people, or self-health management for healthy people. In this study, we aimed at the development of a non-invasive wearable device to measure vital sign. We use a Fiber Bragg Grating (FBG) sensor as pulse wave sensor. A FBG sensor is the optical ?ber. Therefore, a FBG sensor has a lot of features. Its characteristics are suitable for the measurement of vital signs at all times. We ?x FBG sensors to di?erent two points of the body surface and acquired pulse wave. We calculated the systolic blood pressure by using Pulse Transit Time (PTT) which is arrival time lag of pulse wave. We have con?rmed the validity of the principle of systolic blood pressure measurement by FBG sensors.
关键词： wearable,blood pressure measurement,FBG sensor
更新于2025-09-23 15:23:52
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[IEEE 2018 18th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM) - Waterloo, ON (2018.8.19-2018.8.22)] 2018 18th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM) - 3-D Printed Flexible Heterogeneous Substrates with Customizable Gain and Bandwidth
摘要： This paper presents a 3-D printed flexible heterogeneous substrate for wearable antennas with customizable bandwidth and gain. These performance parameters are modified by varying the ratio of percentage area of Acrylonitrile Butadiene Styrene (ABS) to NinjaFlex. Five flexible 3-D printed microstrip patch antenna (MPA) prototypes are designed, realized and measured each with different percentage area ratios, where the MPA’s RF performance is characterized with curvature. The five substrate designs are based on a combination of rigid ABS tiles of triangular shape surrounded with flexible NinjaFlex. All five designs show minimal antenna sensitivity to curvature, with a minimum resonant frequency shift of less than 1.2%. Results closely agree with simulations. Increasing the ABS area increases the MPA’s gain, but reduces the bandwidth and increases substrate rigidity. This results in a highly customizable and cost-effective substrate that allows the antenna designer flexibility in the choice of design parameters.
关键词： conformal antenna,3-D printing,wearable antenna,flexible,patch antenna,ABS,flexible electronics,NinjaFlex
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE CPMT Symposium Japan (ICSJ) - Kyoto, Japan (2018.11.19-2018.11.21)] 2018 IEEE CPMT Symposium Japan (ICSJ) - Wearable Hand Motion Capture Device
摘要： This paper reports a new type of wearable motion capture device. Presented motion capture device can detect the motion of fingers of an operator. This device has been equipped with an air cylinder as an actuator which is to be developed for a force sense presentation. We employed a displacement detection sensor for motion capture, since it is a good combination with an air cylinder. The dimensions of the proposed device were 90mm×225mm×80mm. We evaluated the performance of the sensor integrated into this device and confirmed the important role of the sensor as a hand motion capture function.
关键词： Micro potentiometer,Air cylinder,Hand motion capture,Wearable,Displacement sensor
更新于2025-09-23 15:22:29
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[IEEE 2018 International Flexible Electronics Technology Conference (IFETC) - Ottawa, ON, Canada (2018.8.7-2018.8.9)] 2018 International Flexible Electronics Technology Conference (IFETC) - Smart Fibers Based on Low Dimensional Conductive Materials
摘要： The fragility of traditional metallic or semi-conductive materials hinders their application in flexible electronics. Low dimensional materials including carbon nanotubes, graphene and metal nanowires own outstanding flexibility and have been wildly used to fabricate flexible devices. Bendable/stretchable substrate is another key component of flexible electronics. Various thin polymer films made of polyethylene terephthalate, polyimide, polydimethylsiloxane et. al. were adopted. However, the air impermeability of these substrates will cause discomfort of humanbeing if applied in wearable electronics. Fiber is an ideal substrate for flexible and wearable electronics due to its excellent flexibility/stretchability, superior breathability, abundant microstructure and low cost. Herein, a series of conductive elastomers and strain sensors were fabricated by combining the low dimensional conductive materials with fiber substrates and regulating the microstructure on the interface. With the help of 'twining spring' hierarchical architecture, silver nanowire-double covered yarn (Ag NW-DCY) composite fibers with ultrahigh stretchability were obtained. The conductivity of the composite fibers reached up to 104 S/cm and remained 90% at 2000% tensile strain. Commercial electronic components (LED arrays) were integrated onto a transparent, foldable and stretchable substrate using the composite fibers as stretchable electric wiring, demonstrating the potential application in large-area stretchable electronics. When AgNWs were replaced with graphene, strain sensing fiber with high sensitivity and large working range (100% strain) were fabricated, which enabled the detection of multiple deformation forms, including tensile strain, bending, and torsion. We employ the fibers as wearable sensors, realizing the monitoring of full-range human activities and intricate movement combinations of a robot. Besides, these fibers exhibits fast response, low hysteresis and excellent cycling stability. Another advantage needs to be noted is that these fiber are fabricated by a facial dip coating method, which can be scaled up easily. These smart fibers are of great meaning to the development of flexible and wearable electronics.
关键词： smart textiles,stretchable conductive fibers,wearable electronics
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE International Conference on RFID Technology & Application (RFID-TA) - Macau, Macao (2018.9.26-2018.9.28)] 2018 IEEE International Conference on RFID Technology & Application (RFID-TA) - Fabrication and Practical Evaluation of Glove-integrated Passive UHF RFID Tags
摘要： Passive RFID-based technology is a convincing approach to achieve versatile energy- and cost-efficient wireless platforms for future wearable applications. In this paper, we present passive UHF RFID tags integrated into normal work gloves for wearable RFID applications. We introduce embroidery as a new efficient antenna fabrication method for glove-integrated tags as well as establish reference glove-tag antennas from electro-textiles and copper tape. The performance of the three types of glove-tags is evaluated on a male test subject in an anechoic room and in an office environment. Based on the wireless measurement results, the read ranges of the embroidered glove-tags were around 1 meter in an anechoic chamber and in an office, when measured near the human body. These results meet the requirements of many practical applications of glove-tags, although the read ranges are shorter than those of the electro-textile and copper tape tags that showed read ranges of 2-2.5 meters. Finally, the developed glove-tags were successfully tested in actual use situations for identification and access control. These results are very promising, especially considering the cost-effectiveness of embroidered tag antennas and the easiness of their integration into different types of gloves.
关键词： glove-tag,RFID,wearable antenna,embroidery electronics,electro-textile antenna
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE International Conference on RFID Technology & Application (RFID-TA) - Macau, Macao (2018.9.26-2018.9.28)] 2018 IEEE International Conference on RFID Technology & Application (RFID-TA) - Glove-Integrated Slotted Patch Antenna for Wearable UHF RFID Reader
摘要： We present a glove-integrated slotted patch antenna for a wearable Ultra High Frequency Radio Identification Technology (UHF RFID) reader operating at 866 MHz. We tested the prototype antenna made of copper foil adhered on low-permittivity Ethylene Propylene Diene Monomer (EPDM) foam material having the thickness of 4 mm. To characterize the antenna, we tested it wirelessly in communication with a common dipole type RFID tag to estimate its realized gain, radiation pattern and maximum tag read range it provides. We also analyzed the effects of variable separation between the antenna and the body to confirm stable operation required by the application. The results showed that the antenna feasible for the work glove applications providing the read range up to 360 cm with the reader’s output power of 28.4 dBm.
关键词： work glove application,UHF,RFID reader antenna,wearable antenna,slotted patch antenna
更新于2025-09-23 15:22:29