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- 2018
- Flexible display
- fabrication process
- electrowetting
- PEN substrate
- Optoelectronic Information Science and Engineering
- South China Normal University
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Design and Validation of Flexible Multilayer Frequency Selective Surface with Transmission Zeros
摘要： The design, analysis and validation of a flexible multilayer frequency selective surface (MFSS) with two transmission zeros at the upper side of the passband is presented. The multilayer FSS unit cell is composed of two metallic quasi-Jerusalem-cross patterns on the top and the bottom layers, a metallic slot coupling aperture on the middle layer, and two flexible polyimide-teflon supported substrates. The equivalent circuit is derived to explain the principle of transmission poles and zeros. This MFSS exhibits good resonance stability for different polarization and incident angles. A prototype flexible MFSS centered at 21.6 GHz is fabricated and measured, which shows an insertion loss of 1.3 dB and a fractional bandwidth of 15.7%. The stable performances of the MFSS at oblique incidences and under different bent conditions for TE and TM polarization are demonstrated as well.
关键词： flexible substrate,Multilayer frequency-selective surface (MFSS),transmission zeros
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE 13th Annual International Conference on Nano/Micro Engineered and Molecular Systems (NEMS) - Singapore, Singapore (2018.4.22-2018.4.26)] 2018 IEEE 13th Annual International Conference on Nano/Micro Engineered and Molecular Systems (NEMS) - Enhancement in Energy Harvesting Performances of Piezoelectric Nanogenerator by Sandwiching Electrostatic rGO Layer Between PVDF-BTO Layers
摘要： Herein the fabrication and characterizations of self-poled, tri-layer piezoelectric nanogenerators (PENGs) have been investigated. The tri-layer structure was obtained by sandwiching surface modified n-type reduced graphene oxide (n-rGO) layer between poly(vinylidene fluoride)-barium titanate (PVDF-BTO) sheets. The highly charged n-rGO layer facilitates in improving the crystallinity of PVDF by attracting and aligning the dipoles from lower and upper PVDF-BTO sheets without any external electric field. The enhancement in electro-active beta (β) phase of PVDF was also confirmed through X-ray diffraction pattern. For the comparison analysis three different, single layer (PVDF-BTO), bi-layer (n-rGO/PVDF-BTO), and tri-layer (PVDF-BTO/n-rGO/PVDF-BTO) NGs were prepared. Among them, tri-layer NG reveals maximum open circuit voltage of 10 Vpk-pk. Furthermore, it exhibits short circuit current of 2.5 μApk-pk at an applied force of 2N. Finally, the mechanical stability of fabricated NG was also tested under several pressing and releasing cycles. It was estimated that our fabricated PENG can be a promising building block for powering flexible small electronics.
关键词： energy harvesting,n-rGO,PVDF-BTO,piezoelectric nanogenerators,flexible electronics
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Flexible Antennas for Wearable Applications: Recent Advances and Design Challenges
摘要： Wearable electronics are recently gaining significant scientific interest for a wide range of applications, including healthcare, sports, child monitoring, and consumer electronics. Integration of wireless functionalities into the aforementioned wearable electronics unobtrusive and round-the-clock performance. Therefore, one of the main challenges associated with wearable electronics lies in the realization of body-worn antennas that are flexible, ubiquitous, robust, and low-cost, while still exhibiting Radio- Frequency (RF) performance similar to that of their rigid copper counterparts. With this in mind, this paper presents a state-of-the-art overview of flexible antenna technologies reported for wearable applications. Specifically, the paper explains the fabrication process and outlines the appealing features of two flexible antenna categories, namely thin-film and fabric-based antennas. The paper also explains the design challenges associated with each of these two flexible antenna technologies, as attributed to their associated constraints and restrictions.
关键词： wearables,textile antennas,flexible antennas,thin-film antennas
更新于2025-09-04 15:30:14
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Propriedades de filmes finos de ZnO:Al depositados sobre substratos de poliimida à temperatura ambiente para aplica??es em dispositivos optoeletr?nicos flexíveis
摘要： This work investigated the properties of ZnO:Al thin films produced by radio frequency magnetron sputtering onto polyimide substrates for use as flexible electrodes in optoelectronic devices. For comparison purposes, films were also grown on soda lime glass. The films were deposited with different working powers, onto substrates kept at room temperature. The effects of the power and thickness on the optical, electrical and structural properties of the films were investigated. Atomic force microscopy images revealed that the films were nanocrystalline, with low surface roughness. Values of sheet resistance and transmittance in the visible range were 8 ?/sq (corresponding to 6x10-4 W.cm) and 75%, respectively, which can be considered satisfactory, particularly taking into consideration that deposition was carried out at room temperature.
关键词： transparent electrical contacts,ZnO:Al,flexible transparent electrodes
更新于2025-09-04 15:30:14
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Advanced Modulation Techniques for Flexible Optical Transceivers: the Rate/Reach Trade-off
摘要： This tutorial paper reviews advanced modulation techniques that have been proposed in the literature for the implementation of flexible (or reconfigurable) transceivers, which are fundamental building blocks of next-generation software-defined optical networks. Using a common reference multi-span propagation system scenario, the performance of transceivers employing standard quadrature-amplitude modulation with variable-rate forward error correction, probabilistic constellation shaping and time-domain hybrid formats is assessed, highlighting the achievable flexibility in terms of continuous trade-off between transmission rate and distance. The combination of these techniques with sub-carrier multiplexing, which enables an increase of the fiber nonlinearity tolerance thanks to the optimization of the symbol rate per sub-carrier, is also discussed.
关键词： coherent detection,Optical fiber communication,hybrid QAM,flexible optical transceivers,modulation formats,subcarrier multiplexing,probabilistic shaping
更新于2025-09-04 15:30:14
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Multi-inch single-crystalline perovskite membrane for high-detectivity flexible photosensors
摘要： Single crystalline perovskites exhibit high optical absorption, long carrier lifetime, large carrier mobility, low trap-state-density and high defect tolerance. Unfortunately, all single crystalline perovskites attained so far are limited to bulk single crystals and small area wafers. As such, it is impossible to design highly demanded ?exible single-crystalline electronics and wearable devices including displays, touch sensing devices, transistors, etc. Herein we report a method of induced peripheral crystallization to prepare large area ?exible single-crystalline membrane (SCM) of phenylethylamine lead iodide (C6H5C2H4NH3)2PbI4 with area exceeding 2500 mm2 and thinness as little as 0.6 μm. The ultrathin ?exible SCM exhibits ultralow defect density, superior uniformity and long-term stability. Using the superior ultrathin membrane, a series of ?exible photosensors were designed and fabricated to exhibit very high external quantum ef?ciency of 26530%, responsivity of 98.17 A W?1 and detectivity as much as 1.62 × 1015 cm Hz1/2 W?1 (Jones).
关键词： high-detectivity,single-crystalline perovskite,flexible photosensors,induced peripheral crystallization,ultrathin membrane
更新于2025-09-04 15:30:14
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[IEEE 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Chengdu, China (2018.5.7-2018.5.11)] 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Flexible High Magnetodielectric Materials for Antenna Applications (Invited)
摘要： A novel flexible magneto-dielectric (MD) substrate with high permeability (μr) and permittivity (εr) is developed in this work, and the excellent capability of the novel material for realizing miniaturized and broadband flexible antenna is demonstrated. The MD substrate is mainly comprised of NiZnCo ferrite and polyvinyl alcohol (PVA) through extrusion technology and obtains relatively high μr around 4.5 and εr around 9.0 over a wide frequency range of 10 MHz–1 GHz. A benchmark structure of square microstrip patch antenna was simulated using the common polyimide (PI) flexible substrate and the developed MD substrate, respectively, and MD substrate proves remarkable miniaturization effect. Based on the developed MD substrate, a miniaturized patch antenna working at ultrahigh frequency (UHF) 915 MHz was designed. The overall size of the antenna is 40×40×1 mm3, which is only one-quarter size of the PI substrate antenna. Also, the impedance bandwidth (S11<-10 dB) is enhanced from 8 MHz (910–918 MHz) to 30 MHz (900–930 MHz) for the MD substrate antenna.
关键词： flexible magneto-dielectric substrate,broadband antenna,polyvinyl alcohol,miniaturized antenna,NiZnCo ferrite
更新于2025-09-04 15:30:14
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43.1: <i>Invited Paper:</i> Advances in Flexible Display Materials
摘要： One of the trends in today’s Display technology is flexible displays. It enables consumer electronic products to have form factors of being curved, foldable, bendable and rollable. DowDuPont Electronics & Imaging Display Technology has been heavily investing in flexible technologies. It provides liquid polyimide for customers’ high-quality flexible substrates on which display devices are built.
关键词： Flexible display,Polyimide (PI),Colorless,OLED
更新于2025-09-04 15:30:14
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Flexible silver nanowire transparent conductive films prepared by an electrostatic adsorption self-assembly process
摘要： In this work, we reported a facile approach to fabricate silver nanowire (AgNW) networks on ?exible substrates. Through immersing the modi?ed poly (ethylene terephthalate) with positively charged functional group into the AgNW dispersion with anionic dispersant, a ?exible AgNW transparent conductive ?lm was formed by electrostatic adsorption self-assembly process. Even without a post-treatment process, the as-prepared ?exible AgNW ?lms exhibited excellent optoelectrical property, low surface roughness and high reliability. It was shown that the insulating dispersant on AgNWs could be effectively removed by an ion bombardment method and then greatly decreased the sheet resistance of AgNW networks. Because of the nature of spontaneous adsorption, this preparation method can be suitable for an arbitrary shaped substrate, which will broaden the application of AgNW conductive ?lms in optoelectronic devices.
关键词： self-assembly,transparent conductive ?lms,silver nanowire,electrostatic adsorption,flexible substrates
更新于2025-09-04 15:30:14
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Ag nanoparticle decorated MnO <sub/>2</sub> flakes as flexible SERS substrates for rhodamine 6G detection
摘要： Smart design of advanced substrates for surface-enhanced Raman scattering (SERS) activity is challenging but vital. Herein, we synthesized a new kind of AgNPs/MnO2@Al flexible substrate as a SERS substrate for the detection of the analyte rhodamine 6G (R6G). The fabrication of porous MnO2 nanoflakes on Al foil was conducted via a facile hydrothermal strategy. Owing to the large active surface area of the MnO2 nanoflakes, the Ag nanoparticles were immobilized and displayed superior SERS performance with a low detection concentration of 1 × 10?6 M for R6G. In addition, the SERS performance was found to be strongly related to the morphology of the MnO2@Al substrate material. Our smart design may provide a new method of construction for other advanced SERS substrates for the detection of R6G.
关键词： Ag nanoparticles,rhodamine 6G detection,MnO2 flakes,flexible SERS substrates
更新于2025-09-04 15:30:14