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Flexible electronics based on one-dimensional and two-dimensional hybrid nanomaterials

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InfoMat 2020年第1期2卷 33-56页

作者： Jihun park Jae Chul Hwang Gon Guk Kim jang-ung park Department of Materials Science and Engineering Nano Science Technology InstituteYonsei UniversitySeoulRepublic of Korea Center for Nanomedicine Institute for Basic Science(IBS)Yonsei-IBS InstituteSeoulRepublic of Korea

Research on flexible or wearable electronics has been grown remarkably due to the advent of nanomaterials,such as metal nanowires,graphene,or transition metal *** each nanomaterial has mechanical and electrical characteristics that can be applied into flexible electronics,the limitations of each nanomaterial are also *** order to overcome the limitations of these nanomaterials,research on the hybrid structures of nanomaterials has been extensively *** this study,we introduce the properties of one-dimensional nanomaterials,twodimensional nanomaterials,and their hybrid *** then,we provide information concerning various flexible electronics based on these nanomaterials.

关键词： flexible electronics hybrid nanomaterials one-dimensional nanomaterials two-dimensional nanomaterials wearable electronics

Wireless phototherapeutic contact lenses and glasses with red light-emitting diodes

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Nano Research 2020年第5期13卷 1347-1353页

作者： Young-Geun park Eunkyung Cha Hyeon Seok An Kyoung-Pil Lee Myoung Hoon Song Hong Kyun Kim jang-ung park Nano Science Technology Institute Department of Materials Science and EngineeringYonsei UniversitySeoul 03722Republic of Korea Center for Nanomedicine Institute for Basic Science(IBS)Seoul 03722Republic of Korea Department of Ophthalmology School of MedicineKyungpook National UniversityDaegu41944Republic of Korea School of Materials Science and Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea

Light-mediated therapeutics have attracted considerable attention as a method for the treatment of ophthalmologic diseases,such as age-related macular degeneration,because of their non-invasiveness and the effectiveness to ameliorate the oxidative stress of retinal ***,the current phototherapeutic devices are opaque,bulky,and tethered forms,so they are not feasible for use in continuous treatment during the patient’s daily ***,we report wireless,wearable phototherapeutic devices with red light-emitting diodes for continuous *** light-emitting diodes were formed to be conformal to three-dimensional surfaces of glasses and contact ***,fabricated light-emitting diodes had either transparency or a miniaturized size so that the user’s view is not ***,these devices were operated wirelessly with control of the light *** addition,in-vitro and in-vivo tests using human retinal epithelial cells and a live rabbit demonstrated the effectiveness and reliable operation as phototherapeutic devices.

关键词： transparent electronics wearable healthcare red light-emitting diodes phototherapies

Research on flexible display at Ulsan National Institute of Science and Technology

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npj Flexible Electronics 2017年第1期1卷 47-59页

作者： Jihun park Sanghyun Heo Kibog park Myoung Hoon Song Ju-Young Kim Gyouhyung Kyung Rodney Scott Ruoff jang-ung park Franklin Bien School of Materials Science and Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan Metropolitan City 44919Republic of Korea School of Electrical and Computer Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan Metropolitan City 44919Republic of Korea Department of Physics Ulsan National Institute of Science and Technology(UNIST)Ulsan Metropolitan City 44919Republic of Korea School of Design and Human Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan Metropolitan City 44919Republic of Korea Center for Multidimensional Carbon Materials Institute for Basic Science(IBS)Ulsan 44919Republic of Korea Department of Chemistry Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea

Displays represent information visually,so they have become the fundamental building block to visualize the data of current electronics including ***,electronics have been advanced toward flexible and wearable electronics that can be bent,folded,or stretched while maintaining their performance under various ***,recent advances in research to demonstrate flexible and wearable displays are *** introduce these results by dividing them into several categories according to the components of the display:active-matrix backplane,touch screen panel,light sources,integrated circuit for fingerprint touch screen panel,and characterization tests;and we also present mechanical tests in nano-meter scale and visual ergonomics research.

关键词： dividing electronics panel

Neuromodulation of the peripheral nervous system:Bioelectronic technology and prospective developments

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BMEMat(BioMedical Engineering Materials) 2024年第1期2卷 88-114页

作者： Hayoung Song Moohyun Kim Enji Kim Jakyoung Lee Inhea Jeong Kyeonghee Lim Seoung Young Ryu Myoungjae Oh Younhee Kim jang-ung park Department of Materials Science and Engineering Yonsei UniversitySeoulSouth Korea Center for Nanomedicine Institute for Basic Science(IBS)SeoulSouth Korea Department of Neurosurgery Yonsei University College of MedicineSeoulSouth Korea Graduate Program of Nano Biomedical Engineering(NanoBME) Advanced Science InstituteYonsei UniversitySeoulSouth Korea

The peripheral nervous system(PNS)is a fascinatingly complex and crucial component of the human body,responsible for transmitting vital signals throughout the body's intricate network of *** efficient functioning is paramount to our health,with any dysfunction often resulting in serious medical conditions,including motor disorders,neurological diseases,and psychiatric *** strides in science and technology have made neuromodulation of the PNS a promising avenue for addressing these health *** involves modifying nerve activity using a range of techniques,such as electrical,chemical,optical,and mechanical *** plays a critical role in this effort,allowing for precise,controlled,and sustained stimulation of the *** paper provides an overview of the PNS,discusses the current state of neuromodulation devices,and presents emerging trends in the field,including advances in wireless power transfer and materials,that are shaping the future of neuromodulation.

关键词： bioelectronics neuromodulation peripheral nervous system

Prominent cycling reversibility and kinetics enabled by CaTiO3 protective layer on Zn metal for aqueous Zn-ion batteries

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Journal of Energy Chemistry 2025年第1期100卷 245-258页

作者： Gaeun Lee Yong Nam Ahn Seongjoon So Chanwoo park Jong-Seong Bae Taehyun park Il Tae Kim Jaehyun Hur School of Chemical Biological and Battery Engineering Gachon University Seongnam Busan Center Korea Basic Science Institute

Aqueous Zn-ion batteries （AZIBs） have received considerable attention owing to their various advantages such as safety,low cost,simple battery assembly conditions,and high ionic ***,they still suffer from serious problems,including uncontrollable dendrite growth,corrosion,hydrogen evolution reaction （HER） from water decomposition,electrode passivation,and unexpected *** creation of a uniform artificial nanocrystal layer on the Zn anode surface is a promising strategy for resolving these ***,we propose the use of a perovskite CaTiO3（CTO） protective layer on Zn（CTO@Zn） as a promising approach for improving the performance of *** CTO artificial layer provides an efficient pathway for Zn ion diffusion towards the Zn metal because of the high dielectric constant （εr=180） and ferroelectric characteristics that enable the alignment of dipole moments and redistribute the Zn2+ions in the CTO *** avoiding the direct contact of the Zn anode with the electrolyte solution,the uneven dendrite growth,corrosion,parasitic side reactions,and HER are mitigated,while CTO retains its mechanical and chemical robustness during ***,CTO@Zn demonstrates an improved lifespan in a symmetric cell configuration compared with bare ***@Zn shows steady overpotential （～68 m V） for 1500 h at 1 mA cm-2/0.5 mA h cm-2,excelling bare ***,when paired with the V2O5-C cathode,the CTO@Zn//V2O5-C full battery delivers 148.4 mA h g-1（based on the mass of the cathode） after 300 *** study provides new insights into Zn metal anodes and the development of high-performance AZIBs.

关键词： Artificial layer Dielectric constant Zn metal anode Zinc aqueous battery

Carbon Dioxide Concentration and Flux in an Urban Residential Area in Seoul,Korea

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Advances in Atmospheric Sciences 2014年第5期31卷 1101-1112页

作者： Moon-Soo park Seung Jin JOO Soon-ung park Weather Information Service Engine Center for Atmospheric Science & Earthquake ResearchSeoul 121-835 Korea Center for Atmospheric and Environmental Modeling Seoul 152-775 Korea

The carbon dioxide （CO2） concentrations and fluxes measured at a height of 17.5 m above the ground by a sonic anemometer and an open-path gas analyzer at an urban residential site in Seoul, Korea from February 2011 to January 2012 were analyzed. The annual mean CO2 concentration was found to be 750 mg m-3, with a maximum monthly mean concentration of 827 mg m-3 in January and a minimum value of 679 mg m-3 in August. Meanwhile, the annual mean CO2 flux was found to be 0.45 mg m-2 s-1, with a maximum monthly mean flux of 0.91 mg m-2 s-1 in January and a minimum value of 0.19 mg m-2 s-1 in June. The hourly mean CO2 concentration was found to show a significant diurnal variation; a maximum at 0700-0900 LST and a minimum at 1400-1600 LST, with a large diurnal range in winter and a small one in summer, mainly caused by diurnal changes in mixing height, CO2 flux, and surface complexity. The hourly mean CO2 flux was also found to show a significant diurnal variation, but it showed two maxima at 0700-0900 LST and 2100-2400 LST, and two minima at 1100-1500 LST and 0300-0500 LST, mainly caused by a diurnal pattern in CO2 emissions and sinks from road traffic, domestic heating and cooking by liquefied natural gas use, and the different horizontal distribution of CO2 sources and sinks near the site. Differential advection with respect to wind direction was also found to be a cause of diurnal variations in both the CO2 concentration and flux.

关键词： CO2 concentration CO2 flux liquefied natural gas (LNG) Seoul urban residential area

Non-interleaved chiral metasurfaces and neural networks enhance the spatial resolution of polarimetry

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Light(Science & Applications) 2024年第3期13卷 396-398页

作者： Jaewon jang Minsu park Yeonsang park Department of Physics Chungnam National UniversityDaejeon 34134Korea Institute of Quantum Systems Chungnam National UniversityDaejeon 34134Korea

Non-interleaved chiral metasurfaces for high-spatial-resolution polarimetry are proposed and ***,a convolutional neural network is incorporated to analyze interferometric images with the polarization state of light,an... 详细信息

关键词： parameters chiral resolution

Rational design of ultrafine FeSe_(2) nanocrystals emb e dde d within hollow mesoporous carbon bowls for potassium-ion batteries with long-term cycling stability and high volumetric capacity

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Journal of Materials Science & Technology 2023年第12期143卷 129-139页

作者： Yu Jin jang Hong Geun Oh Seung-Keun park Department of Advanced Materials Engineering Chung-Ang University4726Seodong-daeroDaedeok-myeonAnseong-siGyeonggi-do 17546Republic of Korea

Hollow structures are commonly used to alleviate the mechanical stress on electrode materials and to provide more active sites in potassium-ion batteries(KIBs).Nevertheless,the excessive internal voids within these structures significantly reduce the packing density of particles,resulting in a relatively low volumetric energy density of the fabricated electrodes,which is undesirable for practical *** designed a hollow mesoporous carbon bowl embedded with ultrafine bis(selanylidene)iron(FeSe 2)nanocrystals(FeSe 2@HMCB)via a controllable impregnation method and subsequent selenization pro-cess for high-performance *** as-obtained FeSe 2@HMCB can inherit the advantages of conventional hollow carbon-based composites,such as alleviation of volume variation in active materials,abundant ion storage sites,and high electrical ***,the bowl structure has a higher pack-ing density than the conventional hollow structure,resulting in a significant increase in the volumet-ric energy density of the fabricated *** of these advantages,the FeSe 2@HMCB exhibits a high,stable reversible capacity of 326 mA h g^(-1) even after 1000 cycles at 0.5 A g^(-1),and excellent rate capacities(182 mA h g^(-1) at 3.0 A g^(-1)).Compared with the hollow structured counterpart,the vol-umetric capacity(mA h cm−3)of FeSe 2@HMCB increased by 60%.Furthermore,a full cell consisting of FeSe 2@HMCB//Prussian blue(PB)exhibits excellent electrochemical performance(99 mA h g^(-1) after 100 cycles at 0.1 A g^(-1)).

关键词： Potassium-ion batteries Iron selenide Bowl-like structure Mesoporous carbon Anode material

Environmental friendly synthesis of hierarchical mesoporous platinum nanoparticles templated by fucoidan biopolymer for enhanced hydrogen evolution reaction

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Journal of Materials Science & Technology 2020年第11期42卷 185-190页

作者： Seung Man Lim Kyunglee Kang Hongje jang Jung Tae park Department of Chemical Engineering Konkuk University120 Neungdong-roGwangjin-guSeoul 05029Republic of Korea Department of Chemistry Kwangwoon University20 Cwangwoon-roNowon-guSeoul 01897Republic of Korea

Researching novel hydrogen evolution reaction(HER)catalysts with enhanced electrocatalytic activity,excellent stability,and cost-efficiency is of great significance for the large-scale hydrogen production from industrial electrolysis *** report the preparation of hierarchical mesoporous-Pt nanoparticles(HM-Pt NPs)with coral-like rough surface morphologies using environmental friendly and biocompatible fucoidan(Fu)biopolymer as a surface engineering compound and its application to electrocatalysts for *** designed HM-Pt NPs yields better mass activity of electrocatalysts compared to a commercial Pt/***-Pt NPs showed an overpotential of 33 mV at 10 mA cm-2 for the HER in 0.5 MH2SO4,which was highly comparable to that of the commercial Pt/C catalysts(29 mV).However,the amount of HM-Pt NPs loaded in glassy carbon electrode(0.033 mg mL-1)was approximately 20 times lower than that of the commercial Pt/C(0.64 mg *** HM-Pt NPs also maintained high catalytic stability with a consistent HER current density after 1000 continuous *** excellent HER performance is attributed to the improved electrochemical surface area,highly porous structure,and good surface wettability of the HM-Pt NPs,which results in enhanced electrocatalytic activity,decreased resistance at the electrode/electrolyte interface,and facile penetration of the electrolytes inside the electrode.

关键词： Mesoporous Fucoidan Biopolymer Low Pt content Hydrogen evolution reaction