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- 2018
- silver nanowires
- nanopaper
- transparent electrode
- flexible
- Nanomaterials and Technology
- South China University of Technology
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Optical, thermal and gas separation properties of acetate-containing copoly(ether-imide)s based on 6FDA and fluorenyl diamines
摘要： The diamine, 9,9-bis[4-(4-amino-3-hydroxylphenoxy)phenyl]fluorene (BAHPPF) was synthesized by the modified two-step method. Then, a series of acetate-containing copoly(ether-imide)s were prepared by the copolymerization of BAHPPF, 9,9-bis(4-aminophenyl)fluorene (BAF) and 2,20-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) followed by chemical imidization. The structures and properties of the BAHPPF and copoly(ether-imide)s were characterized by nuclear magnetic resonance spectrometer (NMR), Fourier transform infrared spectrometer (FTIR), X-ray diffractometer (XRD), differential scanning calorimeter (DSC), thermogravimetric analyzer (TGA), ultraviolet-visible spectrophotometer (UV-VIS), and tensile testing. Single gas permeation performances of these copoly(ether-imide)s were also studied for five representative gases of interest including H2, O2, N2, CO2, and CH4. The experimental results showed that the copoly(ether-imide)s showed excellent optical properties with high light transmittance above 80.2% at 450 nm. The glass transition temperature of these copolymers were higher than 333°C. Their tensile strength and Young’s module also increased, and the elongation decreased with the decrease of BAHPPF. High gas permeabilities of copoly(ether-imide)s were obtained, and the ideal selectivity of CO2/CH4 was improved due to the introduction of acetate group and flexible ether linkage. These copoly(ether-imide)s could be applied to the field of optics and gas separation.
关键词： gas separation,acetate-containing,Copoly(ether-imide)s,thermal properties,light-colored and transparent
更新于2025-09-23 15:22:29
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Dynamic operation of liquid crystal cell with inherently nanogroove-featured aligned carbon nanotube sheets
摘要： The use of a highly aligned carbon nanotube (CNT) sheet as a multifunctional constituent for liquid crystal (LC) displays and electro-optic LC applications is assessed. The CNT sheet can perform a dual function: one is an alignment layer for LCs, replacing the commonly used rubbed polyimide film, and the other is a transparent conductive layer, taking the place of indium tin oxide. The hydrophobic treatment improved the adhesion quality between aligned CNT bundles and the glass substrate, which helps to preserve the inherently aligned nanogroove morphology of transparent CNT sheets. The test LC display cells, comprising 4-cyano-4′-pentylbiphenyl molecules sandwiched between CNT-sheet-on-glass substrates, demonstrate the operation characteristics comparable to that of the conventional cell under temperature variation and ac electric field of 1 kHz. The results offer a possibility of deploying multifunctional CNT-sheet alignment layers in LC-based devices, especially in the future flexible display applications.
关键词： Indium-tin oxide transparent conductor,Aligned carbon nanotube sheets,Liquid crystal cells,Polyimide alignment layer for liquid crystal display
更新于2025-09-23 15:22:29
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Raman Spectroscopy through the Indenter Working as an Optical Objective
摘要： The transparent indenter which can used as an optical objective were tested to obtained a spectra during the indentation. A special device which comprises the transparent indenter and actuator was developed and embedded into the Raman spectrometer. An indentation into the silicon sample was performed and phases that exist under the load and without it were identi?ed.
关键词： transparent tip,hardness,Raman spectroscopy,in-situ observation
更新于2025-09-23 15:22:29
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Improvement of 60 GHz transparent patch antenna array performance through specific double-sided micrometric mesh metal technology
摘要： This paper presents the performance of optically transparent 4 × 2 microstrip patch antenna arrays operating at 60 GHz and made from double-sided micrometric mesh metal layers. A high level of optical transparency (higher than 80%) over the entire visible light spectrum coupled with a sheet resistance lower than 0.5 Ω/sq of the mesh metal films are achieved. Microwave performance of the transparent antenna arrays has been performed from two different mesh ground plane patterns and compared with those of an opaque antenna array made of double-sided continuous metal films. A gain value equal to 13.6 dBi at 58.0 GHz has been recorded, against 15.6 dBi at 59.7 GHz for the opaque antenna array. The influence of the mesh structure and mesh parameters of the ground plane is investigated and discussed.
关键词： millimeter wave antenna,Micrometric metal mesh,optically transparent antenna.,microstrip antenna arrays
更新于2025-09-23 15:22:29
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Fast and slow interface traps in transparent NiO gated AlGaN/GaN heterostructure field-effect transistors
摘要： In the present study, the reliability of transparent NiO gated AlGaN/GaN heterostructure field-effect transistors have been investigated. Compared with the TiN Schottky gated device, the p-NiO electrode can suppress the gate leakage and shift the threshold voltage positively. Pulse-mode and temperature-dependent current-voltage measurements demonstrate that both kinds of devices present good stability. The frequency-dependent conductance measurement confirms that only fast trap is detected for the TiN gated device while both fast and slow traps for the NiO gated one. The slow trap is ascribed to the hole trapping in the type-II staggered band configuration between NiO and AlGaN/GaN, which is also confirmed from the obvious threshold voltage instability in high frequency loop scan curves.
关键词： p-NiO,Hole trapping,Reliability,Transparent gate
更新于2025-09-23 15:22:29
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Optical and magneto-optical properties of Nd0.1La0.1Y1.8O3 transparent ceramics
摘要： Transparent ceramics in the form of yttrium oxide (Y2O3) doped with La and Nd and pure yttrium as a reference material were successfully prepared via modified sol-gel processes and hot isostatic pressure sintering. Their structure and microstructure were examined by means of scanning electron microscopy and X-ray diffraction, which revealed the high density and single-phase character of these materials. Their optical and magneto-optical properties were also analyzed. Emission spectra of Nd0.1La0.1Y1.8O3 after excitation performed with a continuous 808 nm laser beam showed strong and sharp emission lines. The luminescence lifetime was also investigated. The doped material exhibited a high Verdet constant of over 1000 deg/T?m. The figure of merit was calculated in the VIS spectrum. The investigated transparent oxide ceramics can be considered a promising material for application in lasers and magneto-optical devices.
关键词： Y2O3,Verdet constant,Optical properties,Luminescence,Microstructure,Transparent ceramics
更新于2025-09-23 15:22:29
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Marangoni interface self-assembly hybrid carbon nano-network for transparent conductive silicone rubber
摘要： Inspired by compact one-dimensional (1D) and two-dimensional (2D) hybrid network like natural thrombosis and beaver’s dam, we use Marangoni interface self-assembly hybrid 1D carbon nanotube and 2D graphene (CNT+G) as continuously connected nano-network onto the surface of silicone ink coated silicone rubber. Both good optical transmittance and electrical conductivity demonstrated in the transparent conductive silicone rubber (TCSR). Besides, the TCSR also have excellent mechanical adhesion between the (CNT+G) film and silicone ink coated silicone rubber.
关键词： Adhesion,Marangoni interface self-assembly,Graphene,CNT,Transparent conductive silicone rubber
更新于2025-09-23 15:22:29
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Fabrication of UV-curable solvent-free epoxy modified silicone resin coating with high transparency and low volume shrinkage
摘要： A type of solvent-free transparent epoxy modified silicone resin coating with high transparency and low volume shrinkage was produced by UV curing method. The features of the UV curing process were studied. The performances of the silicone coating obtained such as transparency, thermal stability and the volume shrinkage were also investigated in detail, which expressed that the materials obtained were with good thermal stability, good adhesive ability and fairly low volume shrinkage.
关键词： UV curing,Transparent coating,Epoxy modified silicone resin,Solvent-Free
更新于2025-09-23 15:22:29
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Control of Structural and Electrical Properties of Indium Tin Oxide (ITO)/Cu(In,Ga)Se <sub/>2</sub> Interface for Transparent Back-Contact Applications
摘要： Development of transparent-conducting oxide (TCO) back contact for Cu(In,Ga)Se2 (CIGS) absorber is crucial for bifacial CIGS photovoltaics. However, GaOx formation at the TCO/CIGS interface has hampered the photocarrier extraction. Here, by controlling the Na doping scheme, we show that the hole transporting properties at the indium?tin oxide (ITO)/CIGS back contact can be substantially improved, regardless of the GaOx formation. Na incorporation from the glass substrate during the GaOx forming phase created defective states at the interface, which allowed efficient hole extraction from CIGS, while post Na treatment after GaOx formation did not play such a role. Furthermore, we discovered that an almost GaOx-free interface could be made by reducing the underlying ITO film thickness, which revealed that ITO/CIGS junction is inherently Schottky. In the GaOx-free condition, post-Na treatment could eliminate the Schottky barrier and create ohmic junction due to generation of conducting paths at the interface, which is supported by our photoluminescence analysis.
关键词： Schottky barrier,indium-tin oxide,photovoltaics,Na doping,Ga)Se2,ohmic contact,GaOx,transparent-conducting oxide,Cu(In
更新于2025-09-23 15:22:29
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Copper Nanowire Dispersion through an Electrostatic Dispersion Mechanism for High-Performance Flexible Transparent Conducting Films and Optoelectronic Devices
摘要： Highly dispersed copper nanowire (CuNW) is an essential prerequisite for its practical application in various electronic devices. At present, the dispersion of CuNW is almost realized through the steric hindrance effect of polymers. However, the high post-treatment temperature of polymers makes this dispersion mechanism impractical for many actual applications. Here, after investigating the relationships between the electrostatic dispersion force and influence factors, an electrostatic dispersion mechanism is refined by us. Under the guidance of this mechanism, high dispersion of CuNW and a record low post-treatment temperature (80 ℃ ) are realized simultaneously. The high dispersity endows CuNW with good stability (–45.66 mV) in water-based ink, high uniformity (65.7 ± 2.5 Ω sq-1) in the prepared transparent conducting film (TCF) (23 cm × 23 cm) and industrial film-preparation process which are the issues that hinder the widespread application of CuNW-based TCF at present. The low post-treatment temperature makes CuNW possible for applying on any substrate. In addition, the charge modifier, 2-mercaptoethanol, enables CuNW to resist oxidation well. Finally, flexible optoelectronic devices employing the CuNW film as the electrode are fabricated and show efficiencies comparable to those of optoelectronic devices on ITO/glass.
关键词： copper nanowires,flexible optoelectronic devices,electrostatic dispersion mechanism,transparent conducting films,post-treatment temperatures
更新于2025-09-23 15:22:29