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Synthesis of uniform silver nanowires from AgCl seeds for transparent conductive films via spin-coating at variable spin-speed
摘要： Uniform silver nanowires (AgNWs) with high aspect ratio are significant to fabricate high-performance transparent conductive films (TCFs). In this work, AgNWs were synthesized through polyol method using AgCl as seeds. The growth mechanism of AgNWs upon AgCl particles was demonstrated, which provided a clear understanding of heterogeneous nucleation for synthesizing crystal. The amounts and the reaction time of AgCl were discussed to probe the effect on morphology of final AgNWs. Apart from that, the temperature was also tuned to provide appropriate thermal energy for synthesis of AgNWs. Uniform AgNWs with thin diameter about 52 nm and aspect ratio above 1000 were synthesized by optimizing the amounts, reaction time of AgCl and the temperature. These AgNWs were utilized to fabricate TCFs firstly through spin-coating at a variable speed. The resulting films coated at variable spin-speed largely improved the performance of films compared with those of films coated at constant spin-speed, exhibiting a low sheet resistance of 54Ω sq-1 and high transmittance of 92% at 550 nm with haze of 5.4%.
关键词： growth,AgCl,Silver nanowires,transparent conductive films,spin-coating
更新于2025-09-10 09:29:36
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Improving the stability of silver nanowire/polyimide composite films for transparent film heaters
摘要： Flexible and transparent heaters have gradually attracted considerable attention because of its widely application in defrosting or demisting windows and medical thermotherapy. The stability of the heater under ambient conditions during working is one of the important properties. In this paper, we fabricated a highly stable and transparent film heater (TFH) through a simple drop-coating approach with burying silver nanowires (AgNWs) between colorless polyimide (cPI) and polymethyl methacrylate (PMMA). The developed TFH exhibited higher stability with the resistance increasing by 17% only for the initial value of 9.6 ? after accelerating test at 105 °C and 100% relative humidity for 36 h, which was much lower than that of 83% for TFH without PMMA. Furthermore, the fabricated film heater covered with PMMA showed extreme stability in hydrogen sulfide oven. Meanwhile, there was no significant influence in the transmittance, mechanical flexibility and heating performance after coating a PMMA layer. Finally, we applied the film heater to demisting demonstration.
关键词： transparent film heaters,polyimide,polymethyl methacrylate,silver nanowires,stability
更新于2025-09-10 09:29:36
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Rapid Pulsed Light Sintering of Silver Nanowires on Woven Polyester for personal thermal management with enhanced performance, durability and cost-effectiveness
摘要： Fabric-based personal heating patches have small geometric profiles and can be attached to selected areas of garments for personal thermal management to enable significant energy savings in built environments. Scalable fabrication of such patches with high thermal performance at low applied voltage, high durability and low materials cost is critical to the widespread implementation of these energy savings. This work investigates a scalable Intense Pulsed Light (IPL) sintering process for fabricating silver nanowire on woven polyester heating patches. Just 300 microseconds of IPL sintering results in 30% lesser electrical resistance, 70% higher thermal performance, greater durability (under bending up to 2 mm radius of curvature, washing, humidity and high temperature), with only 50% the added nanowire mass compared to state-of-the-art. Computational modeling combining electromagnetic and thermal simulations is performed to uncover the nanoscale temperature gradients during IPL sintering, and the underlying reason for greater durability of the nanowire-fabric after sintering. This large-area, high speed, and ambient-condition IPL sintering process represents an attractive strategy for scalably fabricating personal heating fabric-patches with greater thermal performance, higher durability and reduced costs.
关键词： Intense Pulsed Light (IPL) sintering,woven polyester,personal thermal management,energy savings,silver nanowires
更新于2025-09-10 09:29:36
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[IEEE 2018 19th International Conference on Electronic Packaging Technology (ICEPT) - Shanghai (2018.8.8-2018.8.11)] 2018 19th International Conference on Electronic Packaging Technology (ICEPT) - Fabrication and Properties of Silver Nanowire Flexible Transparent Electrode
摘要： Transparent electrodes with high transmittance and high conductivity are important components in display devices. Silver nanowires (AgNWs) are considered as the most promising new electrode materials because of the low cost and high conductivity, especially in flexible displays. In this paper, we first synthesized silver nanowires as electrode materials using the polyol method. Secondly, the silver nanowires were spin-coated on glass substrates and nanopaper to produce transparent electrodes. Finally, the properties of two types of transparent electrodes were investigated, including surface morphology, UV spectrum, square resistance, and light transmittance.
关键词： silver nanowires,nanopaper,transparent electrode,flexible
更新于2025-09-10 09:29:36
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Coupling Layer-by-Layer Assembly and Multilayer Transfer to Fabricate Flexible Transparent Film Heater
摘要： Flexible transparent film heaters (f-TFH) were prepared on a polysulfone (PSU) film with a multilayer transfer of silver nanowires (AgNWs) coated on glass substrates via layer-by-layer (LBL) deposition. First, as-received AgNWs were functionalized with carboxylic acid (AgNW-COOH) and amine (AgNW-NH2) moieties to obtain negatively and positively charged nanowires, respectively. Second, functionalized AgNWs were sequentially coated on a glass substrate via the LBL deposition, which was followed by subjecting the multilayer film to annealing at 125 °C for 30 min to improve the electrical conductivity. Third, the multilayer was transferred from the glass substrate to the polymer film by coating and detaching the PSU. The multilayer film provided optical transmission of 84% and sheet resistance of 12 ?/□ with 5 bilayer sample, which is comparable to indium tin oxide (ITO) film. The f-TFH reached maximum temperature of 128 °C at 7 V with a response time of 45 s. Moreover, it exhibited good defrosting capability by applying 7 V for 20 s. Cyclic bending test results indicated that the sheet resistance of the flexible multilayer film does not demonstrate any change until 300 cycles, while adhesion test 3-M tapes exhibited no sheet resistance change even after 20 peel cycles showing the superior performance of the multilayer film. In addition, the film showed stable heating performance at 128 °C for 5 h.
关键词： Flexible transparent film heater,layer-by-layer deposition,silver nanowires,surface modification,multilayer transfer
更新于2025-09-09 09:28:46
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Self-Assembly Synthesis of Silver Nanowires/Graphene Nanocomposite and Its Effects on the Performance of Electrically Conductive Adhesive
摘要： Among recent advances in electronic packaging technologies, electrically conductive adhesives (ECAs) attract most researchers’ attention, as they are environment-friendly and simple to apply. ECAs also have a lower operating temperature and volume resistivity compared with conventional electronic conductive adhesives. In ECAs, the conducting ?llers play a signi?cant role in improving conductivity and strength. In this work, as ?ller additives, the silver nanowires/ graphene nanocomposites (AgNWs-GNs) were successfully fabricated via a facile self-assembly method. The characteristics of the as-prepared nanocomposites were evaluated by FTIR (Fourier Transform infrared spectroscopy), XRD (X-ray Diffraction), XPS (X-ray photoelectron spectroscopy), TEM (Transmission electron microscope) and Raman tests, demonstrating a successful synthesis process. Different amounts of AgNWs-GNs were used as additives in micron ?ake silver ?ller, and the effects of AgNWs-GNs on the properties of ECAs were studied. The results suggested that the as-synthesized composites can signi?cantly improve the electrical conductivity and shear strength of ECAs. With 0.8% AgNWs/GNs (AgNWs to GO (Graphite oxide) mass ratio is 4:1), the ECAs have the lowest volume resistivity of 9.31 × 10?5 ?·cm (95.4% lower than the blank sample without ?llers), while with 0.6% AgNWs/GNs (AgNWs to GO mass ratio is 6:1), the ECAs reach the highest shear strength of 14.3 MPa (68.2% higher than the blank sample).
关键词： electrically conductive adhesive,volume resistivity,graphene,silver nanowires
更新于2025-09-09 09:28:46
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GaN metal-oxide-semiconductor devices with ZrO2 as dielectric layers
摘要： P-type GaN metal oxide semiconductors (MOS) with ZrO2 dielectrics have been fabricated. Here, H2O and O3 were selected as oxidizers for ZrO2 growth by atomic layer deposition. The MOS devices with O3 oxidant demonstrated a smaller ?at band voltage than that with H2O oxidant. A Ga2O3 interlayer was formed between GaN and O3-grown ZrO2, which can e?ectively decrease interfacial state density to 1.5 × 1011 cm?2. Meanwhile, the innovation of AlZnO (AZO)/Ag nanowires (AgNWs)/AlZnO composite electrodes can further decrease the ?at band voltage to about a half compared to that with traditional Cr/Au electrodes and superior electrical performance was achieved.
关键词： Silver nanowires,MOS,ZrO2,Atomic layer deposition,p-GaN
更新于2025-09-09 09:28:46
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Improved Electrical Stability of Silver NWs Based Hybrid Transparent Electrode interconnected with Polymer Functionalized CNTs
摘要： Silver nanowires have high potential to replace the conventional transparent conductors in many applications. However, the electrical instability of silver nanowires especially when heated as a result of electrical current passage cause the failure of this type of conductors and thus may limit their uses in many applications. In this study, a novel approach based on interconnecting the individual nanowires with conductive polymer wrapped carbon nanotubes is examined to improve the stability of silver nanowires network. The hybrid electrode with modified carbon nanotubes shows highly stable electrical performance in comparison to silver nanowires electrode. Under continuous electrical stress, slight variation in the sheet resistance of the hybrid electrode was noticed and was about two order of magnitude less than that of silver nanowires electrode. Moreover, the thermal studies reveal that the hybrid electrode stabilizes at much lower temperature than that of silver nanowires electrodes. The findings show that the proposed approach is very promising to overcome the failure issue of silver nanowires and to increase the feasibility of their use for device applications.
关键词： Silver nanowires,optical properties,electrical stability,transparent conductor,Carbon nanotubes
更新于2025-09-09 09:28:46
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Imaging the Optical Fields of Functionalized Silver Nanowires through Molecular TERS
摘要： We image 4-mercaptobenzonitrile-functionalized silver nanowires (~20 nm diameter) through tip-enhanced Raman scattering (TERS). The enhanced local optical field-molecular interactions that govern the recorded hyperspectral TERS images are dissected through hybrid finite-difference time-domain-density functional theory simulations. Our forward simulations illustrate that the recorded spatio-spectral profiles of the chemically functionalized nanowires may be reproduced by accounting for the interaction between orientationally averaged molecular polarizability derivative tensors and enhanced incident/scattered local fields polarized along the tip axis. In effect, we directly map the enhanced optical fields of the nanowire in real space through TERS. The simultaneously recorded atomic force microscopy (AFM) images allow a direct comparison between our attainable spatial resolution in topographic (13 nm) and TERS (5 nm) imaging measurements performed under ambient conditions. Overall, our described protocol enables local electric-field imaging with few nm precision through molecular TERS, and it is therefore generally applicable to a variety of plasmonic nano-structures.
关键词： silver nanowires,TERS,nanoscale imaging,optical fields,tip-enhanced Raman scattering
更新于2025-09-09 09:28:46
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Diffusion-Driven Al-Doping of ZnO Nanorods and Stretchable Gas Sensors Made of Doped ZnO Nanorods/Ag Nanowires Bilayers
摘要： A crystal-damage-free nano-doping method, which utilized the vacuum drive-in diffusion of Al into ZnO nanorods, was developed. In this method, vertical ZnO nanorod arrays that were grown by chemical bath deposition beforehand were deposited with Al thin film and subsequently heat-treated under a high vacuum. At an optimum condition, the surface Al atoms were completely diffused into ZnO nanorods, resulting in Al-doped ZnO nanorods. Stretchable gas sensors were fabricated by sequentially drop-casting Al-doped ZnO nanorods and silver nanowires on PDMS substrate. The resistance and response of the sensor could be optimized through the elaborate control of relative densities of Al-doped ZnO nanorods and silver nanowires. The sensor showed a high response of 32.3% to 10 ppm of NO2 gas at room temperature, even under a large strain of 30%. The NO2-sensing mechanism of Al-doped ZnO nanorods/silver nanowires bilayer sensors is discussed on the basis of synergistic interplay of Al-doped ZnO nanorods and silver nanowires.
关键词： Al-doped ZnO nanorods,Stretchable gas sensors,bilayers,drive-in diffusion,silver nanowires
更新于2025-09-09 09:28:46