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- 2018
- Flexible display
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- electrowetting
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- Optoelectronic Information Science and Engineering
- South China Normal University
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[IEEE 2018 IEEE SENSORS - New Delhi, India (2018.10.28-2018.10.31)] 2018 IEEE SENSORS - Sensor for Real-Time Animal Condition and Movement Monitoring
摘要： A flexible, integrated lightweight and minimally intrusive monitoring system has been developed to assess animals’ behavioral responses. The system consists of wearable composite magnets and a miniaturized wireless communication module with a flexible battery. The shape and size of the NdFeB-PDMS composite magnets are highly versatile, while the magnetic and mechanical properties can be tailored within a wide range by the powder concentration. The magnetic field of the composite magnet is sensed by a 3-axial magnetic sensor, and the measured data is wirelessly transmitted using Bluetooth low energy communication standard to a smartphone and dashboard. To withstand corrosive environments and enhance the durability the composite magnets are coated with 2 μm of Parylene C, while surface passivation of the wireless module is achieved with 5 μm of Parylene C. The system has been implemented for real-time monitoring of crabs, giant turtles, and giant clams, indicating its potential for novel and affordable animal monitoring applications.
关键词： real-time monitoring,animal behavior,monitoring system,flexible,minimally intrusive,integrated,wearable composite magnets,wireless communication,Bluetooth low energy,lightweight
更新于2025-09-19 17:15:36
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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) - Carbon Based Electrode for Wearable Biosignal Monitoring Patch
摘要： We fabricated a novel patch type flexible dry electrode for long-term bio signal monitoring by mixing carbon nanofibers (CNFs) in biocompatible-elastomer (MED6015). The CNFs are high conductivity, low price and easy dispersed in elastomer uniformly related with CNTs (Carbon nanotubes). The fabricated CNFs electrodes are coated with sticky elastomer (MG7-9850) to attach on skins without any other adhesive. The mixing ratio of CNFs and elastomer is diverse to compare electrical and mechanical characteristics. ECG (Electrocardiography) signal quality, sweat effects and motion effects are evaluated and the fabricated electrode was shown good quality of signals and tolerant from both effects. Also the electrode was shown to be biocompatible from biocompatibility test. These electrodes could be used for the long-term measurement of bio potential monitoring and wearable devices.
关键词： wearable device,flexible,patch type,dry electrode,CNFs
更新于2025-09-19 17:15:36
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Organic crystalline materials in flexible electronics
摘要： Flexible electronics have attracted considerable attention recently given their potential to revolutionize human lives. High-performance organic crystalline materials (OCMs) are considered strong candidates for next-generation flexible electronics such as displays, image sensors, and artificial skin. They not only have great advantages in terms of flexibility, molecular diversity, low-cost, solution processability, and inherent compatibility with flexible substrates, but also show less grain boundaries with minimal defects, ensuring excellent and uniform electronic characteristics. Meanwhile, OCMs also serve as a powerful tool to probe the intrinsic electronic and mechanical properties of organics and reveal the flexible device physics for further guidance for flexible materials and device design. While the past decades have witnessed huge advances in OCM-based flexible electronics, this review is intended to provide a timely overview of this fascinating field. First, the crystal packing, charge transport, and assembly protocols of OCMs are introduced. State-of-the-art construction strategies for aligned/patterned OCM on/into flexible substrates are then discussed in detail. Following this, advanced OCM-based flexible devices and their potential applications are highlighted. Finally, future directions and opportunities for this field are proposed, in the hope of providing guidance for future research.
关键词： Device fabrication,Flexible electronics,Organic crystalline materials,Charge transport,Applications
更新于2025-09-19 17:15:36
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[IEEE 2018 IEEE 23rd International Conference on Emerging Technologies and Factory Automation (ETFA) - Turin (2018.9.4-2018.9.7)] 2018 IEEE 23rd International Conference on Emerging Technologies and Factory Automation (ETFA) - RiserSure: Automated Deployment of Digital Radiography for Subsea Inspection of Flexible Risers
摘要： Flexible pipes are used as risers to carry oil and gas from sub-sea wells to Floating Production Storage and Offloading vessels. Due to the harsh nature of the environment, these risers are subject to fatigue over their lifetime. It is important, as part of their integrity management, that regular in-service monitoring is undertaken to track how the asset ages. Current inspection methods for flexible risers are limited. Only radiography can inspect the multiple layers within a flexible riser to produce a volumetric inspection. Automated underwater digital radiography improves on traditional radiography by allowing a shorter inspection time. This paper presents the design and development of a new automated, underwater digital radiography inspection system prototype to survey flexible risers at depths of 100m. This is a cost effective solution using a commercially available underwater Gamma radiation source holder and a high definition, linear digital radiography detector housed in a submersible vessel. The sub-sea deployment of a linear detector for underwater inspection of flexible risers is reported for the first time. The use of a linear detector array offers greater sea depth capability, in a smaller package, and the ability to cope with the high radiation energy demands of the Gamma source compared to flat panel detector solutions. Deployment has been achieved by implementation of a bespoke robotic scanning system that can accurately control the source and detector motion. The prototype was mounted on a flexible riser during shallow water sea trials. Preliminary results are presented which show that the internal inner and outer tensile armour layers in the riser have been successfully imaged.
关键词： inspection,robotic scanner,flexible riser,digital radiography,asset integrity
更新于2025-09-19 17:15:36
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Fast Attitude Maneuver of a Flexible Spacecraft with Passive Vibration Control Using Shunted Piezoelectric Transducers
摘要： This paper is concerned with designing a bang-bang control input to perform a quick rotational maneuver of a rigid spacecraft hub connected with flexible appendages. The control design is based on only the rigid body mode making it very simple to design and at the same time achieve the quickest maneuver possible. The induced vibrations are suppressed using piezoelectric transducers bonded to the appendages and connected to an electric circuit with the objective of converting the vibrational energy to electrical energy and then dissipating it using passive electric elements, such as a resistance and an inductor. The proposed control design method is applied to a spacecraft containing a rigid hub and flexible appendages. The attitude control torque is produced using either the reaction wheels contained inside the rigid hub or jet thrusters mounted outside it. The control design process starts with deriving the nonlinear partial differential equations of motion for the spacecraft using Hamilton’s principle which accounts for the electromechanical coupling and the presence of resistive or resistive-inductive circuits. To simplify the analysis, the nonlinear ordinary differential equations of motion are then obtained using the assumed mode method. The effectiveness of the control design method is numerically tested on a spacecraft that is required to perform a quick attitude maneuver and, simultaneously, suppress the induced vibrations. The simulations show a quick and accurate maneuver has been achieved combined with very low levels of vibrations resulting from the reduced coupling between flexible and rigid motions as well as the damping added as a result of the passive shunt circuit. Furthermore, the resistance-inductance shunt circuit is shown to be more effective in damping the vibrations than the resistance shunt circuit.
关键词： vibration control,piezoelectric transducers,attitude maneuver,bang-bang control,flexible spacecraft,shunt circuits
更新于2025-09-19 17:15:36
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Thermally Superstable Cellulosic-Nanorod-Reinforced Transparent Substrates Featuring Microscale Surface Patterns
摘要： The recent rapid expansion of thin-film, bendable, and wearable consumer (opto)electronics demands flexible and transparent substrates other than glass. Plastics are the traditional choice, but they require amelioration because of their thermal instability. Here, we report the successful conversion of a soft and thermally vulnerable polymer into a highly thermally stable transparent nanocomposite material. This is achieved by the meticulous choice of a polymer with a glass-transition temperature below 0 °C that gives stable mechanics above room temperature, reinforcing the polymer with a load-bearing hierarchical network of the incredibly strong and stable natural material: cellulose nanorods. Owing to the Pickering emulsification process, the nanocomposites inherit the self-assembled structural hierarchy from the cellulose nanorod-encapsulated resin droplets. The ameliorated nanocomposites have highly desirable high-temperature endurance (～150?180 °C) in terms of the thermomechanical, thermodimensional, and thermo-optical performance. Any photonic nano- or microstructures can be directly molded on the surface of the nanocomposites in high precision for better light management in photonic and optoelectronic applications. The highlight of this work is the demonstration of a highly thermally stable microlens array on the ameliorated transparent nanocomposite.
关键词： thermal stability,polymer nanocomposites,flexible electronics,Pickering emulsion,microlens array,nanocellulose
更新于2025-09-19 17:15:36
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Transient fiber-shaped flexible electronics comprising dissolvable polymer composites toward multicolor lighting
摘要： An efficient way to solve the issue of electronic-wastes from lighting and display related products is to build water-triggered transient light emitting devices. Herein, we report an all-solution processing method to fabricate dissolvable and flexible light emitting fibers. Using a phosphor–polymer composite emitter sandwiched between core–shell fiber-shaped conductors composed of silver nanowires (AgNWs), the as-fabricated fibers exhibit uniform and omnidirectional light emission, together with excellent flexibility as well as mechanical stability. In particular, attractive multicolor light emission ranging from yellow or blue to white can be integrated into single fibers by scalable dip-coating of different phosphor–polymer composites rationally. Impressively, the fibers assembled from nontoxic emitting and conducting materials can be thoroughly dissolved in water, providing new possibilities towards alleviating environmental pollution caused by electronic wastes.
关键词： flexible electronics,electronic waste,multicolor lighting,light emitting fibers,dissolvable polymers,transient electronics
更新于2025-09-19 17:15:36
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Sol–Gel-Processed Organic–Inorganic Hybrid for Flexible Conductive Substrates Based on Gravure-Printed Silver Nanowires and Graphene
摘要： In this study, an organic–inorganic (O–I) nanohybrid obtained by incorporating an alkoxysilane-functionalized amphiphilic polymer precursor into a SiO2–TiO2 hybrid network was successfully utilized as a buffer layer to fabricate a flexible, transparent, and stable conductive substrate for solution-processed silver nanowires (AgNWs) and graphene under ambient conditions. The resulting O–I nanohybrid sol (denoted as AGPTi) provided a transmittance of the spin-coated AgNWs on an AGPTi-coated glass of 99.4% and high adhesion strength after a 3M tape test, with no visible changes in the AgNWs. In addition, AGPTi acted as a highly functional buffer layer, absorbing the applied pressure between the conductive materials, AgNWs and graphene, and rigid substrate, leading to a significant reduction in sheet resistance. Furthermore, gravure-printed AgNWs and graphene on the AGPTi-based flexible substrate had uniform line widths of 490 ± 15 and 470 ± 12 μm, with 1000-cycle bending durabilities, respectively.
关键词： gravure printing,flexible electronics,nanomaterials,conductive substrate
更新于2025-09-19 17:15:36
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Electrospun CuS/PVP Nanowires and Superior Near-Infrared Filtration Efficiency for Thermal Shielding Applications
摘要： Selective filtration of near-infrared (NIR) region is of primary importance to energy saving via thermal shielding. However, uniform coating of highly effective nanomaterials on flexible substrates remains very challenging. Here, we introduce new materials processing and fabrication methodologies that manufacture electrospun copper sulfide/polyvinylpyrrolidone (CuS/PVP) nanowires for enhanced thermal shielding efficiency. Electrospinning offers well-dispersed CuS nanoparticles in a thermal shielding film, which is not achievable in typical solution coating processes. Directly deposited CuS/PVP nanowires on a flexible polymer membrane are enabled by a fluorination treatment that decreases interfacial electrostatic repulsion. Monitoring of in-situ temperature change of a box shielded, CuS/PVP nanowire film demonstrates excellent NIR shielding efficiency (87.15%). Direct integration of the film with a model car and exposure to direct sunlight demonstrates about twice-higher shielding efficiency than commercial tungsten-oxide films. Overall, the comprehensive study of nanomaterial preparation, surface treatment, and integration techniques allows to fabricate highly flexible and reliable thermal shielding films.
关键词： Near-infrared filtration,CuS/PVP nanowires,Thermal shielding,Electrospinning,and Flexible film
更新于2025-09-19 17:15:36
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High‐Performance Solution‐Processable Flexible SnSe Nanosheet Films for Lower Grade Waste Heat Recovery
摘要： Lower grade waste heat recovery near room temperature is limited due to multiple technology challenges including low efficiency, high cost, and scalability. Here, a low-cost and scalable solution process is reported to fabricate a nanostructured SnSe thin film, and a high thermoelectric performance near room temperature is demonstrated. This transport study reveals strong phonon scattering near the interfaces between SnSe nanosheets that introduces a large thermal boundary resistance and an ultralow thermal conductivity of 0.09 W m?1 K?1. Moreover, it is demonstrated that the SnSe thin film can be readily implemented on flexible plastic substrates and preserve the high thermoelectric performance over 1000 bending cycles. Together, this study demonstrates a low-cost and scalable approach to achieve high-performance flexible thin film energy harvesting devices to power electronics and sensors near room temperature.
关键词： energy efficiency,2D van der Waals materials,solution-processing,thermoelectrics,thermal energy harvesting,phonons,nanostructures,flexible electronics
更新于2025-09-19 17:15:36