• Title, Summary, Keyword: Silver nanowire

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Fabrication of All-Solution Processed Transparent Silver Nanowire Electrode Using a Direct Printing Process

  • Baek, Jang-Mi;Lee, Rin;Seong, Myeong-Mo
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.641-641
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    • 2013
  • We report the transparentsilver nanowire electrode fabricated by a direct printing process, liquid-bridge-mediated nanotransfer molding. We fabricated silver nanowire arrays by liquidbridge- mediated nanotransfer molding using the silver nanoparticle ink and PEDOT:PSS polymer. Weinvestigated the formation of silver nanowire arrays by SEM and transmittance of the transparent silver nanowire electrode. We also measured the conductivity to confirm the potential of our approach.

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A Study of the Yellowing Phenomenon in the Laser Patterning of Silver Nanowire (은 나노와이어 레이저 패터닝 시 발생하는 황변 현상에 대한 연구)

  • Hwang, June Sik;Park, Jong Eun;Yang, Min Yang
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.24 no.1
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    • pp.94-97
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    • 2015
  • In this study, we introduce a yellowing phenomenon in silver nanowire laser patterning and attempt to understand the cause of this phenomenon. Silver nanowire is a promising alternative to indium tin oxide as a transparent electrode owing to its flexibility. Additionally, silver nanowire can be easily patterned by laser ablation, which is free of dangerous chemicals. However, a yellowish color change reducing visibility is observed on the patterned area of the silver nanowires, and this yellowing phenomenon prevents the use of silver nanowire as a transparent electrode material. We concluded that resolidified debris of melted and evaporated silver nanowires after laser ablation causes the color change of the electrode. Further research is needed to determine a means of mitigating this yellowing phenomenon.

Joule Heating of Metallic Nanowire Random Network for Transparent Heater Applications

  • Pichitpajongkit, Aekachan;Eom, Hyeonjin;Park, Inkyu
    • Journal of Sensor Science and Technology
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    • v.29 no.4
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    • pp.227-231
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    • 2020
  • Silver nanowire random networks are promising candidates for replacing indium tin oxide (ITO) as transparent and conductive electrodes. They can also be used as transparent heating films with self-cleaning and defogging properties. By virtue of the Joule heating effect, silver nanowire random networks can be heated when voltage bias is applied; however, they are unsuitable for long-term use. In this work, we study the Joule heating of silver nanowire random networks embedded in polymers. Silver nanowire random networks embedded in polymers exhibit breakdown under the application of electric current. Their surface morphological changes indicate that nanoparticle formation may be the main cause of this electrical breakdown. Numerical analyses are used to investigate the temperatures of the silver nanowire and substrate.

Enhancement of Electrical Conductivity in Silver Nanowire Network for Transparent Conducting Electrode using Copper Electrodeposition (구리 전기도금 방법을 이용한 은 나노와이어 투명전극의 전기전도도 향상)

  • Ji, Hanna;Jang, Jiseong;Lee, Sangyeob;Chung, Choong-Heui
    • Korean Journal of Materials Research
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    • v.29 no.5
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    • pp.311-316
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    • 2019
  • Transparent conducting electrodes are essential components in various optoelectrical devices. Although indium tin oxide thin films have been widely used for transparent conducting electrodes, silver nanowire network is a promising alternative to indium tin oxide thin films owing to its lower processing cost and greater suitability for flexible device application. In order to widen the application of silver nanowire network, the electrical conductance has to be improved while maintaining high optical transparency. In this study, we report the enhancement of the electrical conductance of silver nanowire network transparent electrodes by copper electrodeposition on the silver nanowire networks. The electrodeposited copper lowered the sheet resistance of the silver nanowire networks from $21.9{\Omega}{\square}$ to $12.6{\Omega}{\square}$. We perform detailed X-ray diffraction analysis revealing the effect of the amount of electrodeposited copper-shell on the sheet resistance of the core-shell(silver/copper) nanowire network transparent electrodes. From the relationship between the cross-sectional area of the copper-shell and the sheet resistance of the transparent electrodes, we deduce the electrical resistivity of electrodeposited copper to be approximately 4.5 times that of copper bulk.

Estimation of Sensitivity Enhancements of Material-Dependent Localized Surface Plasmon Resonance Sensor Using Nanowire Patterns (금속물질에 따른 나노구조를 이용한 국소 표면 플라즈몬 공명 센서 특성 분석)

  • Ahn, Heesang;Ahn, Dong-Gyu;Song, Yung Min;Kim, Kyujung
    • Journal of the Korean Society for Precision Engineering
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    • v.33 no.5
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    • pp.363-369
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    • 2016
  • We explored localized plasmonic field enhancements using nanowire patterns to improve the sensitivity of a surface plasmon resonance (SPR) sensor. Two different materials, gold and silver, were considered for sample materials. Gold and silver nanowire patterns were fabricated by electron beam lithography for experimental measurements. The wavelength SPR sensor was also designed for these experiments. The material-dependent field enhancements on nanowire patterns were first calculated based on Maxwell's equations. Resonance wavelength shifts were indicated as changes in the refractive index from 1.33 to 1.36. The SPR sensor with silver nanowire patterns showed a much larger resonance wavelength shift than the sensor with gold nanowire patterns, in good agreement with simulation results. These results suggest that silver nanowire patterns are more efficient than gold nanowire patterns, and could be used for sensitivity enhancements in situations where biocompatibility is not a consideration.

High Density Silver Nanowire Arrays using Self-ordered Anodic Aluminum Oxide(AAO) Membrane

  • Kim, Yong-Hyun;Han, Young-Hwan;Lee, Hyung-Jik;Lee, Hyung-Bock
    • Journal of the Korean Ceramic Society
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    • v.45 no.4
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    • pp.191-195
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    • 2008
  • Highly ordered silver nanowire with a diameter of 10 nm was arrayed by electroless deposition in a porous anodic aluminum oxide(AAO) membrane. The AAO membrane was fabricated electrochemically in an oxalic acid solution via a two-step anodization process, while growth of the silver nanowire was initiated by using electroless deposition at the long-range-ordered nanochannels of the AAO membrane followed by thermal reduction of a silver nitrate aqueous solution by increasing the temperature up to $350^{\circ}C$ for an hour. An additional electro-chemical procedure was applied after the two-step anodization to control the pore size and channel density of AAO, which enabled us to fabricate highly-ordered silver nanowire on a large scale. Electroless deposition of silver nitrate aqueous solution into the AAO membrane and thermal reduction of silver nanowires was performed by increasing the temperature up to $350^{\circ}C$ for 1 h. The morphologies of silver nanowires arrayed in the AAO membrane were investigated using SEM. The chemical composition and crystalline structure were confirmed by XRD and EDX. The electroless-deposited silver nanowires in AAO revealed a well-crystallized self-ordered array with a width of 10 nm.

Development of AgNW/Reduced Graphene Oxide Hybrid Transparent Electrode with Long-Term Stability Using Plasma Reduction (플라즈마 환원 기술을 응용한 장수명의 은나노와이어/Reduced Graphene Oxide 하이브리드 투명전극 개발)

  • Jung, Sunghoon;Ahn, Wonmin;Kim, Do-Geun
    • Journal of the Korean institute of surface engineering
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    • v.49 no.1
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    • pp.87-91
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    • 2016
  • The development of high performance transparent electrode with flexibility have been required for flexible electronics. Here, we demonstrate the silver nanowire and reduced graphene oxide hybrid transparent electrode for replacing brittle indium-tin-oxide electrode by spray coating technique and plasma reduction. The spray coating system is applied to deposit silver nanowire and over coated graphene oxide films and it has a great potential to scale-up. The resistance of silver nanowire transparent electrode is reduced by 10% and the surface roughness is decreased after graphene oxide coating. The over-coated graphene oxide is successfully reduced by $H_2$ plasma treatment and it is effective in increasing the environmental stability of electrode. The lifetime of silver nanowire and reduced graphene oxide hybrid electrode at $85^{\circ}C$ of Celsius degree of temperature and 85% of relative humidity has much increased.

Improvement of Electrical Property and Stability of Silver Nanowire Transparent Electrode Via Ion-beam Treatment (이온빔 처리를 통한 은나노와이어 전극의 전기적 특성과 안정성 향상)

  • Jung, Sunghoon;Lee, Seunghun;Kim, Do-Geun
    • Journal of the Korean institute of surface engineering
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    • v.50 no.6
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    • pp.455-459
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    • 2017
  • The development of flexible transparent electrode has been paid attention for flexible electronics. In this study, we have developed transparent electrode based on silver nanowires with improved electrical property and stability through ion-beam treatment. The energetic particles of ion-beam could sinter junctions of each silver nanowires and etch out polyvinylpyrollidone(PVP) coated on silver nanowires. The sheet resistance of silver nanowire transparent electrode was reduced by 74%, and the resistance uniformity was increased about 3 times after exposure of ion beam. Moreover, the stability at $85^{\circ}C$ of temperature and 85% of relative humidity could be also improved.

Fabrications of Silver Nanowire/NiO Based High Thermal-Resistance Hybrid Transparent Electrode (은나노선/Ni 산화물 고내열성 하이브리드 투명전극의 형성)

  • Jung, Sunghoon;Lee, Seunghun;Kim, Do-Geun
    • Journal of the Korean institute of surface engineering
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    • v.50 no.6
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    • pp.486-491
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    • 2017
  • Silver nanowire (AgNW) transparent electrode is one of next generations of flexible and transparent electrode. The electrode shows high conductivity and high transparency comparable to ITO. However, the electrode is weak against heat. The wires are separated into nanodots at temperature above $200^{\circ}C$. It causes the electrical resistance increase. Moreover, it is vulnerable to oxygen and moisture in the atmosphere. The improvement of thermal and moisture resistance of silver nanowire transparent electrode is the most important for commercializing. We proposed silver nanowires transparent electrode which is capped with very thin nickel oxide layer. The nickel oxide layer is five nanometers of thickness, but the heat and moisture resistance of the transparent electrode is effectively improved. The AgNW/NiO electrode can endure at $300^{\circ}C$ of temperature for 30 minutes, and resistance is not increased for 180 hours at $85^{\circ}C$ of temperature and 85% of relative humidity. We showed an applications of transparent and flexible heater using the electrode, the heater is operated more than $180^{\circ}C$ of temperature.

Experimental Study on Coffee-ring Effect of Silver Nanowire with Different Parameters (은 나노와이어 특성에 따른 커피 링 현상에 대한 실험적 연구)

  • Kang, Giho;Wang, Xiaofeng;Seong, Baekhoon;Lee, Hyungdong;Byun, Doyoung
    • Journal of the Korean Society of Visualization
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    • v.15 no.2
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    • pp.16-20
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    • 2017
  • A coffee-ring effect is from capillary flow by different evaporation rate across the droplet. The capillary flow tends particles to accumulate at the edges of the droplet and makes the ring-shaped stain pattern. These coffee-ring formation and suppression of coffee-ring have been a critical role in printing and coating technologies. In this study, we present the experimental study on coffee-ring effect of silver nanowire inside the evaporating sessile droplet. Size and concentration effect of nanowires at coffee-ring effect has been investigated. From the coffee-ring, we observed the regimes of connected rings and disconnected ones and measure the resistivity of single ring pattern with different nanowire length.