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oe1(光电查) - 科学论文

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出版时间
  • 2018
研究主题
  • Flexible display
  • fabrication process
  • electrowetting
  • PEN substrate
应用领域
  • Optoelectronic Information Science and Engineering
机构单位
  • South China Normal University
400 条数据
?? 中文（中国） ▾

  • A Fully Integrated 11.2 mm2 a-IGZO EMG Front-end Circuit on Flexible Substrate Achieving up to 41dB SNR and 29MΩ Input Impedance

    摘要： A biopotential front-end circuit is designed and fabricated using a-IGZO TFTs on flexible plastic substrate. Its input chopper provides both noise reduction and Frequency Division Multiplexing among multiple front-ends in an array. Measurements of the front-end at chopping frequencies from 5 to 8 kHz show a gain in the range of 24.9 - 23.1 dB, bandwidth of 5.4 to 5.2 kHz, input noise in the EMG band ranging from 125 μVRM S to 31.4 μVRM S, and an input impedance of 29.6 to 23 M ?. At different chopping frequencies, the SNR in the EMG band is respectively 29, 32.3, 38, 41 dB, enough to monitor Muscle Fibre Conduction velocity. This is achieved in a total area of 11.2 mm2 and with 1.3 mW power consumption. In-vivo recordings of EMG from the forearm of a person using the fabricated front-end and standard gel electrodes have been performed. The measurements show EMG bursts with a maximum amplitude of 1.6 mV, which is within the physiological range for this muscle. The proposed circuit achieves an 8.9X reduction in size compared to previous front-ends fabricated on flexible foil for EMG applications, enabling a spatial resolution in the order of a few millimetres, with great benefit for the diagnosis of neuromuscular disorders.

    关键词： IGZO,EMG,flexible electronics,Biomedical circuits,EHG

    更新于2025-09-23 15:21:21

  • Flexible and reusable cap-like thin Fe2O3 film for SERS applications

    摘要： Cap-like α-Fe2O3 films are fabricated and deposited onto quartz fabric by using radio frequency magnetron sputtering and annealing. The treated fabric sample in this study shows highly sensitive surface-enhanced Raman scattering (SERS) and excellent flexibility, reproducibility and stability. In addition, the sample can be recovered after a washing process with an organic solvent and repeatedly used. The sensitive SERS performance is attributed to chemical enhancement through a charge transfer process. Moreover, the SERS performance is also found to be dependent on the light coupling effect. When the light absorbance rate of the α-Fe2O3 films increases at a wavelength near that of laser light, the film shows excellent sensitivity due to light coupling effect.

    关键词： α-Fe2O3,Raman sensor,flexible,quartz fabric,SERS

    更新于2025-09-23 15:21:21

  • Fabrication of ultra-thin, hydrophobic and flexible electromagnetic wave absorber sheets based on nano-carbon/carbonyl iron in a polypyrrole/silicone rubber matrix

    摘要： In this work, electromagnetic (EM) wave absorbing properties of polypyrrole/silicone rubber (PP-SI) filled nano-carbon and carbonyl iron (CI) nanocomposites have been investigated in the X-band. The PP-SR matrix was provided by the incorporation of polypyrrole and liquid silicone rubber in the ratio of 10:90. The PP-SR serves not only as a matrix but also promotes the flexibility and EM wave absorption of the nanocomposite sheets. In the present research, the chemical, morphology, thermal, wetting, absorption, and mechanical properties of the EM wave absorber sheets are investigated. The EM wave absorber sheet with 3 wt% nano-carbon and 37 wt% CI and a thickness of 1 mm, exhibits a minimum reflection loss around ?13 dB at 10.27 GHz. The absorber sheet with an elongation of 520% could be qualified as a superior elastic sheet. The specimen represents higher thermal stability compared with pure SR, and the contact angle of the sheet proved that their surface should be hydrophobic.

    关键词： Flexible wave absorbers,Silicone rubber,Polypyrrole,EM wave absorber sheets

    更新于2025-09-23 15:21:21

  • <i>(Invited)</i> Fabrication Technique for Low-Temperature Aqueous Solution-Processed Oxide Thin-Film Transistors

    摘要： Solution-processing of oxide semiconductor is a promising technique for the simple and low-cost fabrication of oxide thin-film transistors (TFTs). We demonstrate improved TFT characteristics by application of a hydrogen injection and oxidation (HIO) process to the fabrication of high-performance low-temperature oxide TFTs. The compatibility of this technique for flexible substrates was also confirmed when the HIO method was applied to solution-processed metal oxide TFTs.

    关键词： solution-processing,flexible substrates,low-temperature fabrication,oxide thin-film transistors,hydrogen injection and oxidation

    更新于2025-09-23 15:21:21

  • Flexible electrochromic tungsten/iron mixed oxide films synthesized by an atmospheric pressure plasma jet

    摘要： Flexible electrochromic organo-tungsten- iron oxide (WFexOyCz) films are rapidly deposited onto flexible (60 Ω/□ polyethylene terephthalate/indium tin oxide; PET/ITO) substrates by a low temperature-atmospheric pressure-plasma polymerization method with an atmospheric pressure plasma jet (APPJ) for a short exposed duration of 48 s. The precursor vapors of tungsten hexacarbonyl [W(CO)6] and biscyclopentadienyl iron [ferrocene; Fe(C5H5)2] are mixed with O2 gases at various gas flow rates, injected into air plasma jet and sprayed onto PET/ITO substrates at room temperature (~23oC) and at atmospheric pressure (1.013 × 105 Pa). Flexible electrochromic WFexOyCz films are synthesized with a specific addition of oxygen gases with superior lithium electrochromic properties as demonstrated by a potential sweep alternating between -1 V and 2 V at a scan rate of 40 mV/s in a 1 M LiClO4-propylene carbonate electrolyte. With amorphous WFexOyCz films produced with an APPJ by adding oxygen gases at a specific flow rate of 0.5 sccm, a high value in oxygen deficiency up to 0.189 allows more Li+ ions to intercalate into and deintercalate out of the film. Significant coloration and bleaching are proven by the high values in optical transmittance modulation (ΔT) of up to 70.3%, optical density (ΔOD) up to 0.77 and color efficiency (η) up to 61.3 cm2/C, at a wavelength of 800 nm, respectively.

    关键词： Electrochromic materials,Iron oxide,Tungsten oxide,Flexible electrochromic film,Atmospheric pressure plasmas,Plasma polymerization

    更新于2025-09-23 15:21:21

  • Self-powered flexible electronics beyond thermal limits

    摘要： Self-powered flexible electronics using high-performance inorganic materials have been studied and developed for the essence of future electronics due to the thing, lightweight, self-sustainable, and biocompatible characteristics, which can be applied to body sensor network and next generation Internet of Things (IoT). However, most of inorganic materials should be processed in the high-temperature processes such as the semiconductor fabrication, which is not compatible flexible plastic substrates. Therefore, the new approaches must be demonstrated to overcome the thermal limits of previous methodology and achieve the flexible inorganic electronics on various flexible plastic substrates. In this review paper, we introduce the recent progress of technologies to realize flexible and high-performance inorganic electronics on plastic substrates over the thermal limits, i.e., laser-assisted procedure, chemical or mechanical exfoliation approaches. They are compatible not only to flexible plastic substrates but also to conventional device processes. We also explain the novel application devices such as flexible optoelectronics, flexible large-scale integration (LSI) devices, flexible energy harvesters, and flexible sensors using the recent-developed technologies beyond the previous thermal limit. This paper highlights the proper direction to complete future flexible inorganic electronics for high-performance self-powered systems.

    关键词： High-temperature process,Self-powered device,Exfoliation,System-on-plastic,Laser technology,Flexible electronics

    更新于2025-09-23 15:21:21

  • A flexible organic reflectance oximeter array

    摘要： Transmission-mode pulse oximetry, the optical method for determining oxygen saturation in blood, is limited to only tissues that can be transilluminated, such as the earlobes and the fingers. The existing sensor configuration provides only single-point measurements, lacking 2D oxygenation mapping capability. Here, we demonstrate a flexible and printed sensor array composed of organic light-emitting diodes and organic photodiodes, which senses reflected light from tissue to determine the oxygen saturation. We use the reflectance oximeter array beyond the conventional sensing locations. The sensor is implemented to measure oxygen saturation on the forehead with 1.1% mean error and to create 2D oxygenation maps of adult forearms under pressure-cuff–induced ischemia. In addition, we present mathematical models to determine oxygenation in the presence and absence of a pulsatile arterial blood signal. The mechanical flexibility, 2D oxygenation mapping capability, and the ability to place the sensor in various locations make the reflectance oximeter array promising for medical sensing applications such as monitoring of real-time chronic medical conditions as well as postsurgery recovery management of tissues, organs, and wounds.

    关键词： flexible electronics,wearable sensors,oximetry,organic electronics,bioelectronics

    更新于2025-09-23 15:21:21

  • Using a nanosecond laser to pattern copper nanowire-based flexible electrodes: From simulation to practical application

    摘要： Copper nanowire (Cu NW) electrodes have shown promise for use in next-generation transparent conducting films due to their high electrical conductivity, low-cost solution-based synthesis processes, and high transmittance properties. Recently, the use of lasers for the modification of nanostructures has received considerable attention. Despite the advantages of laser machining such as producing any shape in an accurate, time-saving, non-contact process, the laser patterning of Cu NW electrodes has not been extensively studied, particularly the heat effect of the laser irradiation process on the flexible substrate. In this report, we present experimental and computational results of a selective and direct patterning process by using nanosecond pulsed laser irradiation. The experimental and simulation results were used to optimize the laser ablation parameters for the patterning process of the ultra-long Cu NW transparent electrodes so as to not damage the flexible substrates. Finally, a bifunctional flexible smart-window was fabricated to demonstrate a practical application of the laser-patterned Cu NW electrodes.

    关键词： Copper nanowires,Laser patterning,Flexible substrate,Nanosecond pulsed laser,Flexible smart-window

    更新于2025-09-23 15:21:01

  • Transparent and Flexible Electronics Assembled with Metallic Nanowire-Layered Non-drying Glycerogel

    摘要： There has been increasing demand for transparent and mechanically durable electrical conductors for their uses in wearable electronic devices. It is common to layer metallic nanowires on transparent but stiff polydimethylsiloxane (PDMS) or stretchable but opaque EcoflexTM-based substrates. Here, we hypothesized that layering metallic nanowires on a stretchable and hygroscopic gel would allow us to assemble a transparent, stretchable, and durable conductor. The hygroscopic property of the gel was attained by partially replacing water in the pre-formed polyacrylamide hydrogel with glycerol. The resulting gel, denoted as a glycerogel, could remain hydrated for over 6 months in air by taking up water molecules from the air. The glycerogel was tailored to be stretchable up to 8 times its original length by tuning the amount of cross-linker and acrylamide. The resulting glycerogel allowed for deposition of wavy silver nanowires using the pre-strain method up to 400 % pre-strain, without causing kinks and interfacial cracks often found with nanowires layered onto PDMS. With a pre-strain of 100%, the resulting nanowire-gel conductor exhibited optical transparency (85%) and electrical conductivity (17.1 ohm/sq) even after 5,000 cycles of deformation. The results of this study would broadly be useful to improve the performance of the next generation of flexible electronic devices.

    关键词： glycerol,toughness,hydration,stretchable hydrogel,flexible electronics

    更新于2025-09-23 15:21:01

  • The low resistance and high sensitivity in stretchable electrode assembled by liquid-phase exfoliated graphene

    摘要： Flexible electrodes have been extensively investigated to fulfill the development of highly advanced human interaction electronics. It’s still a challenge to develop the conductive film for the scalable device with low resistance under large deformation. In this work, we reported a stretchable conductive layer on elastomer substrates assembled by few-layer graphene, which was exfoliated in the low-boiling organic solvent with assistance of hyperbranched copolymer as stabilizer that was adsorbed on the nanosheets via CH-π non-covalent connections. The relative resistance change of graphene film is 117% as the mechanical strain reaches 35%, which retains high conductivity under tensile operation. The resistance of the graphene electrode is dependent on the overlapping of the nanosheets during the deformation, in which the slipping of nanosheets is due to the lubricant effect of the hyperbranched segments acting as dynamic CH-π interactions. This work highlights a general strategy of the stretchable conductive film for the flexible electronics, and sheds a light on the conduction mechanism for the graphene film during large deformation.

    关键词： Stretchable,Graphene,Flexible electrode,Hyperbranched polymer

    更新于2025-09-23 15:21:01