The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Sukjoon Hong - One of the best experts on this subject based on the ideXlab platform.
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stretchable and transparent kirigami conductor of nanowire Percolation Network for electronic skin applications
Nano Letters, 2019Co-Authors: Phillip Won, Sukjoon Hong, Jinhwan Lee, Seonggeun Han, Jung Jae Park, Taemin Lee, Mansoo Choi, Kyujin ChoAbstract:Recent research progress of relieving discomfort between electronics and human body involves serpentine designs, ultrathin films, and extraordinary properties of nanomaterials. However, these strat...
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highly stretchable and transparent electromagnetic interference shielding film based on silver nanowire Percolation Network for wearable electronics applications
ACS Applied Materials & Interfaces, 2017Co-Authors: Jinwook Jung, Habeom Lee, Hyunmin Cho, Kyun Kyu Kim, Jinhyeong Kwon, Phillip Won, Sukjoon HongAbstract:Future electronics are expected to develop into wearable forms, and an adequate stretchability is required for the forthcoming wearable electronics considering various motions occurring in human body. Along with stretchability, transparency can increase both the functionality and esthetic features in future wearable electronics. In this study, we demonstrate, for the first time, a highly stretchable and transparent electromagnetic interference shielding layer for wearable electronic applications with silver nanowire Percolation Network on elastic poly(dimethylsiloxane) substrate. The proposed stretchable and transparent electromagnetic interference shielding layer shows a high electromagnetic wave shielding effectiveness even under a high tensile strain condition. It is expected for the silver nanowire Percolation Network-based electromagnetic interference shielding layer to be beyond the conventional electromagnetic interference shielding materials and to broaden its application range to various fields t...
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Selective Thermochemical Growth of Hierarchical ZnO Nanowire Branches on Silver Nanowire Backbone Percolation Network Heaters
The Journal of Physical Chemistry C, 2017Co-Authors: Ha Beom Lee, Junyeob Yeo, Jinhwan Lee, Hyunmin Cho, Jinhyeong Kwon, Seungyong Han, Sangwan Kim, Sukjoon HongAbstract:The development of hydrothermal growth enabled facile growth of ZnO nanowire over a large area at mild environments, yet its usage in actual electronic devices has been restricted due to poor spatial selectivity in the growth and a difficulty in the integration to other components. We introduce a local thermochemical growth of ZnO nanowire branches on Ag nanowire backbone Percolation Networks by electrical current induced local resistive heating in liquid environment for easy fabrication of metal–semiconductor hierarchical nanowire structure. Through vacuum filtration transfer and laser ablation process, patterned conductive Network composed of ZnO nanoparticle functionalized Ag nanowire Percolation Network was prepared as a conductive Network for localized resistive heating. Upon the application of proper bias voltage, highly localized temperature field was generated in the vicinity of the patterned Ag nanowire Network heater to induce the selective growth of ZnO nanowire from the Ag nanowire backbone. A...
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High Efficiency, Transparent, Reusable, and Active PM2.5 Filters by Hierarchical Ag Nanowire Percolation Network
Nano letters, 2017Co-Authors: Seongmin Jeong, Ha Beom Lee, Sukjoon Hong, Junyeob Yeo, Hyunmin Cho, Phillip Won, Seonggeun Han, Jinhyeong KwonAbstract:Air quality has become a major public health issue in Asia including China, Korea, and India. Particulate matters are the major concern in air quality. We present the first environmental application demonstration of Ag nanowire Percolation Network for a novel, electrical type transparent, reusable, and active PM2.5 air filter although the Ag nanowire Percolation Network has been studied as a very promising transparent conductor in optoelectronics. Compared with previous particulate matter air filter study using relatively weaker short-range intermolecular force in polar polymeric nanofiber, Ag nanowire Percolation Network filters use stronger long-range electrostatic force to capture PM2.5, and they are highly efficient (>99.99%), transparent, working on an active mode, low power consumption, antibacterial, and reusable after simple washing. The proposed new particulate matter filter can be applied for a highly efficient, reusable, active and energy efficient filter for wearable electronics application.
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Highly Sensitive and Stretchable Multidimensional Strain Sensor with Prestrained Anisotropic Metal Nanowire Percolation Networks
Nano letters, 2015Co-Authors: Kyun Kyu Kim, Sukjoon Hong, Jinhwan Lee, Hyunmin Cho, Young Duk Suh, Jooyeun HamAbstract:To overcome the limitation of the conventional single axis-strain sensor, we demonstrate a multidimensional strain sensor composed of two layers of prestrained silver nanowire Percolation Network with decoupled and polarized electrical response in principal and perpendicular directional strain. The information on strain vector is successfully measured up to 35% maximum strain with large gauge factor (>20). The potential of the proposed sensor as a versatile wearable device has been further confirmed.
Jinhwan Lee - One of the best experts on this subject based on the ideXlab platform.
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stretchable and transparent kirigami conductor of nanowire Percolation Network for electronic skin applications
Nano Letters, 2019Co-Authors: Phillip Won, Sukjoon Hong, Jinhwan Lee, Seonggeun Han, Jung Jae Park, Taemin Lee, Mansoo Choi, Kyujin ChoAbstract:Recent research progress of relieving discomfort between electronics and human body involves serpentine designs, ultrathin films, and extraordinary properties of nanomaterials. However, these strat...
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Selective Thermochemical Growth of Hierarchical ZnO Nanowire Branches on Silver Nanowire Backbone Percolation Network Heaters
The Journal of Physical Chemistry C, 2017Co-Authors: Ha Beom Lee, Junyeob Yeo, Jinhwan Lee, Hyunmin Cho, Jinhyeong Kwon, Seungyong Han, Sangwan Kim, Sukjoon HongAbstract:The development of hydrothermal growth enabled facile growth of ZnO nanowire over a large area at mild environments, yet its usage in actual electronic devices has been restricted due to poor spatial selectivity in the growth and a difficulty in the integration to other components. We introduce a local thermochemical growth of ZnO nanowire branches on Ag nanowire backbone Percolation Networks by electrical current induced local resistive heating in liquid environment for easy fabrication of metal–semiconductor hierarchical nanowire structure. Through vacuum filtration transfer and laser ablation process, patterned conductive Network composed of ZnO nanoparticle functionalized Ag nanowire Percolation Network was prepared as a conductive Network for localized resistive heating. Upon the application of proper bias voltage, highly localized temperature field was generated in the vicinity of the patterned Ag nanowire Network heater to induce the selective growth of ZnO nanowire from the Ag nanowire backbone. A...
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Highly Sensitive and Stretchable Multidimensional Strain Sensor with Prestrained Anisotropic Metal Nanowire Percolation Networks
Nano letters, 2015Co-Authors: Kyun Kyu Kim, Sukjoon Hong, Jinhwan Lee, Hyunmin Cho, Young Duk Suh, Jooyeun HamAbstract:To overcome the limitation of the conventional single axis-strain sensor, we demonstrate a multidimensional strain sensor composed of two layers of prestrained silver nanowire Percolation Network with decoupled and polarized electrical response in principal and perpendicular directional strain. The information on strain vector is successfully measured up to 35% maximum strain with large gauge factor (>20). The potential of the proposed sensor as a versatile wearable device has been further confirmed.
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Selective Laser Direct Patterning of Silver Nanowire Percolation Network Transparent Conductor for Capacitive Touch Panel.
Journal of nanoscience and nanotechnology, 2015Co-Authors: Sukjoon Hong, Ha Beom Lee, Phillip Lee, Junyeob Yeo, Jinhwan Lee, Seung S. LeeAbstract:We introduce a facile method to enhance the functionality of a patterned metallic transparent conductor through selective laser ablation of metal nanowire Percolation Network. By scanning focused nanosecond pulsed laser on silver nanowire Percolation Network, silver nanowires are selectively ablated and patterned without using any conventional chemical etching or photolithography steps. Various arbitrary patterns of silver nanowire transparent conductors are readily created on the Percolation Network by changing various laser parameters such as repetition rate and power. The macroscopic optical and electrical properties of the Percolation Network transparent conductor can be easily tuned by changing the conductor pattern design via digital selective laser ablation. Further investigation on the silver nanowire based electrode line prepared by the ablation process substantiates that the general relation for a conducting thin film fails at a narrow width, which should be considered for the applications that requires a high resolution patterns. Finally, as a proof of concept, a capacitive touch sensor with diamond patterns has been demonstrated by selective laser ablation of metal nanowire Percolation Network.
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fast plasmonic laser nanowelding for a cu nanowire Percolation Network for flexible transparent conductors and stretchable electronics
Advanced Materials, 2014Co-Authors: Phillip Lee, Sukjoon Hong, Junyeob Yeo, Jinhwan Lee, Jinhyeong Kwon, Seungyong Han, Jooyeun Ham, Bongchul Kang, Seung S. LeeAbstract:A facile fast laser nanoscale welding process uses the plasmonic effect at a nanowire (NW) junction to suppress oxidation and successfully fabricate a Cu-NW-based Percolation-Network conductor. The "nanowelding" process does not require an inert or vacuum environment. Due to the low-temperature and fast-process nature, plasmonic laser nanowelding may form Cu-nanowire Networks on heat-sensitive, flexible or even stretchable substrates.
Wei Peng - One of the best experts on this subject based on the ideXlab platform.
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Percolation Network in resistive switching devices with the structure of silver amorphous silicon p type silicon
Applied Physics Letters, 2014Co-Authors: Yanhong Liu, Ping Gao, Xuening Jiang, Wei PengAbstract:Conducting pathway of Percolation Network was identified in resistive switching devices (RSDs) with the structure of silver/amorphous silicon/p-type silicon (Ag/a-Si/p-Si) based on its gradual RESET-process and the stochastic complex impedance spectroscopy characteristics (CIS). The formation of the Percolation Network is attributed to amounts of nanocrystalline Si particles as well as defect sites embedded in a-Si layer, in which the defect sites supply positions for Ag ions to nucleate and grow. The similar Percolation Network has been only observed in Ag-Ge-Se based RSD before. This report provides a better understanding for electric properties of RSD based on the Percolation Network.
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Percolation Network in resistive switching devices with the structure of silver/amorphous silicon/p-type silicon
Applied Physics Letters, 2014Co-Authors: Yanhong Liu, Ping Gao, Xuening Jiang, Wei PengAbstract:Conducting pathway of Percolation Network was identified in resistive switching devices (RSDs) with the structure of silver/amorphous silicon/p-type silicon (Ag/a-Si/p-Si) based on its gradual RESET-process and the stochastic complex impedance spectroscopy characteristics (CIS). The formation of the Percolation Network is attributed to amounts of nanocrystalline Si particles as well as defect sites embedded in a-Si layer, in which the defect sites supply positions for Ag ions to nucleate and grow. The similar Percolation Network has been only observed in Ag-Ge-Se based RSD before. This report provides a better understanding for electric properties of RSD based on the Percolation Network.
Junyeob Yeo - One of the best experts on this subject based on the ideXlab platform.
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Selective Thermochemical Growth of Hierarchical ZnO Nanowire Branches on Silver Nanowire Backbone Percolation Network Heaters
The Journal of Physical Chemistry C, 2017Co-Authors: Ha Beom Lee, Junyeob Yeo, Jinhwan Lee, Hyunmin Cho, Jinhyeong Kwon, Seungyong Han, Sangwan Kim, Sukjoon HongAbstract:The development of hydrothermal growth enabled facile growth of ZnO nanowire over a large area at mild environments, yet its usage in actual electronic devices has been restricted due to poor spatial selectivity in the growth and a difficulty in the integration to other components. We introduce a local thermochemical growth of ZnO nanowire branches on Ag nanowire backbone Percolation Networks by electrical current induced local resistive heating in liquid environment for easy fabrication of metal–semiconductor hierarchical nanowire structure. Through vacuum filtration transfer and laser ablation process, patterned conductive Network composed of ZnO nanoparticle functionalized Ag nanowire Percolation Network was prepared as a conductive Network for localized resistive heating. Upon the application of proper bias voltage, highly localized temperature field was generated in the vicinity of the patterned Ag nanowire Network heater to induce the selective growth of ZnO nanowire from the Ag nanowire backbone. A...
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High Efficiency, Transparent, Reusable, and Active PM2.5 Filters by Hierarchical Ag Nanowire Percolation Network
Nano letters, 2017Co-Authors: Seongmin Jeong, Ha Beom Lee, Sukjoon Hong, Junyeob Yeo, Hyunmin Cho, Phillip Won, Seonggeun Han, Jinhyeong KwonAbstract:Air quality has become a major public health issue in Asia including China, Korea, and India. Particulate matters are the major concern in air quality. We present the first environmental application demonstration of Ag nanowire Percolation Network for a novel, electrical type transparent, reusable, and active PM2.5 air filter although the Ag nanowire Percolation Network has been studied as a very promising transparent conductor in optoelectronics. Compared with previous particulate matter air filter study using relatively weaker short-range intermolecular force in polar polymeric nanofiber, Ag nanowire Percolation Network filters use stronger long-range electrostatic force to capture PM2.5, and they are highly efficient (>99.99%), transparent, working on an active mode, low power consumption, antibacterial, and reusable after simple washing. The proposed new particulate matter filter can be applied for a highly efficient, reusable, active and energy efficient filter for wearable electronics application.
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Selective Laser Direct Patterning of Silver Nanowire Percolation Network Transparent Conductor for Capacitive Touch Panel.
Journal of nanoscience and nanotechnology, 2015Co-Authors: Sukjoon Hong, Ha Beom Lee, Phillip Lee, Junyeob Yeo, Jinhwan Lee, Seung S. LeeAbstract:We introduce a facile method to enhance the functionality of a patterned metallic transparent conductor through selective laser ablation of metal nanowire Percolation Network. By scanning focused nanosecond pulsed laser on silver nanowire Percolation Network, silver nanowires are selectively ablated and patterned without using any conventional chemical etching or photolithography steps. Various arbitrary patterns of silver nanowire transparent conductors are readily created on the Percolation Network by changing various laser parameters such as repetition rate and power. The macroscopic optical and electrical properties of the Percolation Network transparent conductor can be easily tuned by changing the conductor pattern design via digital selective laser ablation. Further investigation on the silver nanowire based electrode line prepared by the ablation process substantiates that the general relation for a conducting thin film fails at a narrow width, which should be considered for the applications that requires a high resolution patterns. Finally, as a proof of concept, a capacitive touch sensor with diamond patterns has been demonstrated by selective laser ablation of metal nanowire Percolation Network.
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fast plasmonic laser nanowelding for a cu nanowire Percolation Network for flexible transparent conductors and stretchable electronics
Advanced Materials, 2014Co-Authors: Phillip Lee, Sukjoon Hong, Junyeob Yeo, Jinhwan Lee, Jinhyeong Kwon, Seungyong Han, Jooyeun Ham, Bongchul Kang, Seung S. LeeAbstract:A facile fast laser nanoscale welding process uses the plasmonic effect at a nanowire (NW) junction to suppress oxidation and successfully fabricate a Cu-NW-based Percolation-Network conductor. The "nanowelding" process does not require an inert or vacuum environment. Due to the low-temperature and fast-process nature, plasmonic laser nanowelding may form Cu-nanowire Networks on heat-sensitive, flexible or even stretchable substrates.
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Room-temperature nanosoldering of a very long metal nanowire Network by conducting-polymer-assisted joining for a flexible touch-panel application
Advanced Functional Materials, 2013Co-Authors: Jinhwan Lee, Ha Beom Lee, Inhwa Lee, Phillip Lee, Seung Seob Lee, Sukjoon Hong, Junyeob Yeo, Dongjin Lee, Taek-soo Kim, Seung Hwan KoAbstract:As an alternative to the brittle and expensive indium tin oxide (ITO) transparent conductor, a very simple, room-temperature nanosoldering method of Ag nanowire Percolation Network is developed with conducting polymer to demonstrate highly flexible and even stretchable transparent conductors. The drying conducting polymer on Ag nanowire Percolation Network is used as a nanosoldering material inducing strong capillary-force-assisted stiction of the nanowires to other nanowires or to the substrate to enhance the electrical conductivity, mechanical stability, and adhesion to the substrate of the nanowire Percolation Network without the conventional high-temperature annealing step. Highly bendable Ag nanowire/conducting polymer hybrid films with low sheet resistance and high transmittance are demonstrated on a plastic substrate. The fabricated flexible transparent electrode maintains its conductivity over 20 000 cyclic bends and 5 to 10% stretching. Finally, a large area (A4-size) transparent conductor and a flexible touch panel on a non-flat surface are fabricated to demonstrate the possibility of cost-effective mass production as well as the applicability to the unconventional arbitrary soft surfaces. These results suggest that this is an important step toward producing intelligent and multifunctional soft electric devices as friendly human/electronics interface, and it may ultimately contribute to the applications in wearable computers.
Martin R. Castell - One of the best experts on this subject based on the ideXlab platform.
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ANFO vapour detection with conducting polymer Percolation Network sensors and GC/MS.
The Analyst, 2021Co-Authors: Merel J. Lefferts, Lisa H. Humphreys, Nathalie Mai, Krishnan Murugappan, Ben I. Armitage, Jean-françois Pons, Martin R. CastellAbstract:Ammonium nitrate mixed with fuel oil (ANFO) is commonly used in improvised explosive devices (IEDs). The development of ANFO vapour sensors that are small, inexpensive, and easy to use will enable widespread IED detection in the context of security and humanitarian demining. Because of concealment and the low vapour pressures of most explosive materials, achieving sufficiently high sensitivity and low limits of detection are some of the main challenges of explosives vapour detection. Here ANFO chemiresistive vapour sensors based on polypyrrole (PPy) Percolation Networks are presented and compared to gas chromatography-mass spectroscopy (GC/MS) results for ANFO. Improved sensitivities are achieved by using a polymer Percolation Network instead of a thin film for the gas sensors. Vapour concentrations are detected of 13-180 ppb of ammonia emitted by a variety of different ammonium nitrate-containing fertilisers and fertiliser-diesel mixtures.
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anfo vapour detection with conducting polymer Percolation Network sensors and gc ms
Analyst, 2021Co-Authors: Merel J. Lefferts, Nathalie Mai, Krishnan Murugappan, Ben I. Armitage, Jean-françois Pons, Lisa Humphreys, Martin R. CastellAbstract:Ammonium nitrate mixed with fuel oil (ANFO) is commonly used in improvised explosive devices (IEDs). The development of ANFO vapour sensors that are small, inexpensive, and easy to use will enable widespread IED detection in the context of security and humanitarian demining. Because of concealment and the low vapour pressures of most explosive materials, achieving sufficiently high sensitivity and low limits of detection are some of the main challenges of explosives vapour detection. Here ANFO chemiresistive vapour sensors based on polypyrrole (PPy) Percolation Networks are presented and compared to gas chromatography-mass spectroscopy (GC/MS) results for ANFO. Improved sensitivities are achieved by using a polymer Percolation Network instead of a thin film for the gas sensors. Vapour concentrations are detected of 13-180 ppb of ammonia emitted by a variety of different ammonium nitrate-containing fertilisers and fertiliser-diesel mixtures.