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Materials and devices for flexible and stretchable photodetectors and light-emitting diodes

Nano Research 2021年第9期14卷 2919-2937页

作者： Jun-Kyul Song Min Sung Kim Seungwon Yoo ja hoon koo Dae-Hyeong Kim Center for Nanoparticle Research Institute for Basic Science(IBS)Seoul 08826Republic of Korea School of Chemical and Biological Engineering and Institute of Chemical Processes Seoul National UniversitySeoul 08826Republic of Korea Interdisciplinary Program for Bioengineering Seoul National UniversitySeoul 08826Republic of Korea Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea

Recently,significant efforts have been directed at overcoming the limitations of conventional rigid optoelectronic devices,particularly their poor mechanical stability under bending,folding,and stretching *** of major approaches for rendering optoelectronic devices mechanically deformable is to replace the conventional electronic/optoelectronic materials with functional nanomaterials or organic materials that are intrinsically flexible/***,advanced device designs and unconventional fabrication methods have also contributed to the development of soft optoelectronic ***,new devices such as bio-inspired curved image sensors,wearable light emitting devices,and deformable bio-integrated optoelectronic devices have been *** this review,recent progress in the development of soft optoelectronic materials and devices is ***,various materials such as nanomaterials,organic materials,and their hybrids that are suitable for developing deformable photodetectors,are ***,the nanomaterials and organic/polymeric materials that are applicable in deformable light-emitting diodes are ***,representative system-level applications of flexible and stretchable photodetectors and light-emitting diodes are reviewed,and future prospects are discussed.

关键词： nanomaterial organic material photodetector light-emitting diode flexible optoelectronics stretchable optoelectronics

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Recent advances in soft electronic materials for intrinsically stretchable optoelectronic systems

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Opto-Electronic Advances 2022年第8期5卷 21-49页

作者： ja hoon koo Huiwon Yun Woongchan Lee Sung-Hyuk Sunwoo Hyung Joon Shim Dae-Hyeong Kim Center for Nanoparticle Research Institute for Basic Science(IBS)Seoul 08826Republic of Korea School of Chemical and Biological Engineering Institute of Chemical ProcessesSeoul National UniversitySeoul 08826Republic of Korea Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea.

In recent years,significant progress has been achieved in the design and fabrication of stretchable optoelectronic *** general,stretchability has been achieved through geometrical modifications of device components,such as with serpentine interconnects or buckled ***,the local stiffness of individual pixels and the limited pixel density of the array have impeded further advancements in stretchable ***,intrinsically stretch-able optoelectronics have been proposed as an alternative ***,we review the recent advances in soft elec-tronic materials for application in intrinsically stretchable optoelectronic ***,we introduce various intrinsically stretchable electronic materials,comprised of electronic fillers,elastomers,and surfactants,and exemplify different in-trinsically stretchable conducting and semiconducting *** also describe the processing methods used to fabricate the electrodes,interconnections,charge transport layers,and optically active layers used in intrinsically stretch-able optoelectronic ***,we review representative examples of intrinsically stretchable optoelectronic devices,including light-emitting capacitors,light-emitting diodes,photodetectors,and ***,we briefly discuss intrinsically stretchable integrated optoelectronic systems.

关键词： stretchable optoelectronics light-emitting capacitors light-emitting diodes photodetectors photovoltaics intrinsically stretchable devices

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Exploring the relationship between rarity and price of profile picture NFT: A formal concept analysis on the BAYC NFT collection

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BLOCKCHAIN-RESEARCH AND APPLICATIONS 2024年第2期5卷 140-150页

作者： Lee, Heejung Lee, Geun-Cheol koo, hoon-Young Hanyang Univ Sch Interdisciplinary Ind Studies 222 Wangsimni Ro Seoul 04763 South Korea Konkuk Univ Coll Business Adm 120 Neungdong Ro Seoul 05029 South Korea Chungnam Natl Univ Sch Business 99 Daehak Ro Daejeon 34134 South Korea

Non-fungible token (NFT) is a digital asset whose ownership can be validated and controlled via blockchain technology. The NFT market is a rapidly growing field, and the rarity of NFT is an essential factor that affects its price, as scarcity leads to higher demand. This study focuses on the BAYC NFT collection, which is a successful and representative collection of profile picture NFT, and analyzes how rarity affects NFT prices. This paper investigates the relationship between the rarity and price of the BAYC NFT collection using formal concept analysis (FCA) method. The results show that rarity is a major factor influencing the price of NFT and the effect is more apparent in the medium rarity range. When rarity is very high or very low, other factors become significant determinants, such as the uniqueness and appeal of NFT, and even the naturalness of NFT images. This research highlights the importance of considering rarity when assessing NFT and underscores the need for a comprehensive evaluation of NFT rarity. This study also provides valuable insights into the NFT market and can be useful for NFT investors, creators, and collectors. Furthermore, the usefulness of FCA as a tool for quantifying NFT rarity and evaluating NFT price was demonstrated.

关键词： NFT valuation Formal concept analysis Rarity

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Erratum to: Materials and devices for flexible and stretchable photodetectors and light-emitting diodes

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Nano Research 2021年第11期14卷 4362-4362页

作者： Jun-Kyul Song Min Sung Kim Seungwon Yoo ja hoon koo Dae-Hyeong Kim Center for Nanoparticle Research Institute for Basic Science(IBS)Seoul08826Republic of Korea School of Chemical and Biological Engineering and Institute of Chemical Processes Seoul National UniversitySeoul08826Republic of Korea Interdisciplinary Program for Bioengineering Seoul National UniversitySeoul08826Republic of Korea Department of Materials Science and Engineering Seoul National UniversitySeoul08826Republic of Korea

Erratum to Nano Research 2021,14(9):2919-2937 https://***/10.1007/s 12274-021-3447-3 The figure caption of Figure 1,instead of Figure 1 Schematic illustration of various nanomaterials and organic materials used in fle... 详细信息

关键词： diodes emitting Figure

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Improvement in the Adhesion Between Electrode of a SOFC and Ag Paste as a Current Collector by Au Deposition

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Journal of Materials Science & Technology 2015年第3期31卷 257-263页

作者： Sang koo Jeon Seung hoon Nahm Oh Heon Kwon Department of Safety Engineering Pukyong National University Center for Energy Materials Metrology Korea Research Institute or Standards and Science

This paper reports the use of Au films to improve the performance of the stacked solid oxide fuel cell(SOFC) based on the characterization of the interface and the adhesion between the electrodes of the SOFCs and the Ag paste. The specimens were manufactured to perform the experiment as follows. A Si O2 wafer with a 300 mm notch was attached to the electrodes of a SOFC by a Ag paste and Au film, which were deposited on the electrodes by sputtering for 1 min or 5 min deposition time and annealed at300 C for 1 h. The four-point bending test was performed, which resulted in the formation of an extended crack at the tip on the wafer notch, and the crack propagation was observed using a stereo microscope equipped with a charge-coupled device(CCD). Consequently, the interfacial adhesion energy and the effect of the Au film between the each electrode and the Ag paste can be evaluated. On the cathode, the interfacial adhesion energy without Au film was 2.59 J/m2(upper value) and the adhesion energy increased to 11.59 J/m2(upper value) and 15.89 J/m2(lower value) with the Au film. On the anode,the interfacial adhesion energy without Au film was 1.74 J/m2(upper value), which increased to 11.07 J/m2(upper value) and 14.74 J/m2(lower value) with the Au film. In addition, the interface areas were analyzed by scanning electron microscopy(SEM) and energy dispersive spectroscopy(EDS) to estimate the interface delamination.

关键词： Solid oxide fuel cell Au film Interfacial adhesion

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Improved block matching approach to fast disparity estimation

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Journal of Systems Engineering and Electronics 2009年第6期20卷 1278-1285页

作者： Tao Tangfei ja Choon koo Hyouk Ryeol Choi School of Mechanical Engineering Xi'an Jiaotong Univ. Xi'an 710049 P. R. China State Key Lab. for Manufacturing Systems Engineering Xi'an 710049 P. R. China School of Mechanical Engineering Sungkyunkwan Univ. Suwon Republic of Korea

An improved block matching approach to fast disparity estimation in machine vision applications is proposed, where the matching criterion is the sum of the absolute difference（SAD）.By evaluating the lower bounds, which become increasingly tighter for the matching criteria, the method tries to successively terminate unnecessary computations of the matching criteria between the reference block in one image and the ineligible candidate blocks in another *** also eliminates the ineligible blocks as early as possible, while ensuring the optimal disparity of each ***, the proposed method can further speed up the elimination of ineligible candidate blocks by efficiently using the continuous constraint of disparity to predict the initial disparity of each *** performance of the new algorithm is evaluated by carrying out a theoretical analysis, and by comparing its performance with the disparity estimation method based on the standard block *** results demonstrate that the proposed algorithm achieves a computational cost reduction of over 50.5% in comparision with the standard block matching method.

关键词： machine vision block matching disparity estimation sum of the absolute difference.

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Photocatalytic degradation of organic pollutants using green oil palm frond-derived carbon quantum dots/titanium dioxide as multifunctional photocatalysts under visible light radiation

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Chinese Journal of Chemical Engineering 2022年第11期51卷 21-34页

作者： Zeng Wei Heng Woon Chan Chong Yean Ling Pang Lan Ching Sim Chai hoon koo Lee Kong Chian Faculty of Engineering and Science Universiti Tunku Abdul RahmanSungai Long CampusJalan Sungai LongCheras43000 KajangSelangorMalaysia Centre for Photonics and Advanced Materials Research Universiti Tunku Abdul RahmanSungai Long CampusJalan Sungai LongCheras43000 KajangSelangorMalaysia

The present work suggested the use of waste oil palm frond as an alternative precursor for nitrogendoped carbon quantum dots(NCQDs)and proposed a straightforward in-situ hydrothermal method for the preparation of NCQDs/TiO_(2)*** elemental composition,morphological,structural and optical characteristics of NCQDs/TiO_(2)nanocomposites have been comprehensively *** successful grafting of NCQDs on TiO_(2)matrix was confirmed by the formation of Ti AOAC bond and the electronic coupling between theπ-states of NCQDs and the conduction band of TiO_(2).For the first time,the oil palm frond-derived NCQDs/TiO_(2)was adopted in the photodegradation of methylene blue(MB)under visible-light *** a result,the photocatalytic efficiency of NCQDs/TiO_(2)nanocomposites(86.16%)was 2.85 times higher than its counterpart TiO_(2)(30.18%).The enhanced performance of nanocomposites was attributed to the pivotal roles of NCQDs serving as electron mediator and visiblelight ***,the optimal NCQDs loading was determined at 4 ml while the removal efficiency of NCQDs/TiO_(2)-4 was the highest at a catalyst dosage of 1 g.L^(-1)under alkaline *** research work is important as it proposed a new insight to the preparation of biomass-based NCQDs/TiO_(2)using a facile synthetic method,which offers a green and sustainable water remediation technology.

关键词： Oil palm frond biomass N-doped carbon quantum dots Titanium-dioxide In-situ hydrothermal Visible light photocatalysis Methylene blue

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A renormalization group approach to crowd psychology and inter-group coupling in social many-body systems

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Chinese Science Bulletin 2012年第2期57卷 247-252页

作者： KIM Chul koo LEE Kong-Ju-Bock CHUNG Myung-hoon Institute of Physics and Applied Physics Yonsei University Department of Physics Ewha Woman's University Department of Physics Hongik University

By adopting majority rule within a renormalization group approach,we can show that the strength of inter-group interaction in a social system either grows or shrinks monotonically with increasing group size,depending on the initial coupling strength of individuals in the *** contrasts with the findings of previous studies in which the strength of the interaction grows with group size regardless of the initial *** approach clearly demonstrates that the phenomena of crowd psychology,such as an extreme anti-reaction between different ethnic or ideological groups,could be a consequence of the many-particle nature of social systems when the initial strength of the interaction is larger than a critical *** effect of neutral opinion holders is critically examined using the spin-one Ising *** critical size of the population of neutral opinion holders,that can prevent crowd polarization,depends on the block spin rule.

关键词：重整化群方法社会制度耦合强度从众心理多体系统群体相互作用初始强度

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Lactic Acid Fermentation from Coffee Ground Waste Hydrolysate by Lactobacillus rhamnosus

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Journal of Renewable Materials 2019年第4期7卷 365-372页

作者： ja-Ryong koo Hye Min Park Se Kyung Kim Hyun Shik Yun Department of Biological Engineering Inha UniversityIncheon 22212Korea Institute of Industrial Biotechnology Inha University Research and Business FoundationIncheon 22212Korea

Lactic acid is an important organic acid that is widely used in the food,pharmaceutical,and cosmetic *** acid was produced from coffee ground waste which contains fermentable sugars and is increasingly generated from our daily dietary *** 114 strains of Lactobacillus species,Lactobacillus rhamnosus ATCC 10863 was selected for the production of lactic acid from coffee ground *** alkali pretreatment and saccharification,cellulose and hemicellulose in coffee ground waste were converted into fermentable *** experiments were conducted at various alkali solution,concentrations,and *** pretreatment with 35 g/L of KOH at 121oC for 60 min,the highest concentration of fermentable sugars was *** optimum concentration of Viscozyme L was 2%when saccharification was proceeded at 55oC for 7 *** productivity of lactic acid fermentation was the highest(0.59 g/L/h)at 100 g of coffee ground waste(1x concentration),whereas the lactic acid concentration was the highest at 600 g of coffee ground waste(6x concentration).As the concentration of coffee ground increased,the lactic acid concentration was also increased,however,the amount was not proportional to the coffee ground waste *** this study,it was found that coffee ground waste could be used as a culture medium for Lactobacillus rhamnosus ATCC 10863 through pretreatment and saccharification for the production of lactic acid.

关键词： Coffee ground waste Lactobacillus rhamnosus lactic acid fermentable sugars saccharification alkali pretreatment

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Performance evaluation of polyamide nanofiltration membranes for phosphorus removal process and their stability against strong acid/alkali solution

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Chinese Journal of Chemical Engineering 2019年第8期27卷 1789-1797页

作者： Yen Khai Chai How Chun Lam Chai hoon koo Woei Jye Lau Soon Onn Lai Ahmad Fauzi Ismail Department of Civil Engineering Lee Kong Chian Faculty of Engineering and ScienceUniversiti Tunku Abdul RahmanJalan Bandar Sg.LongBandar Sg.Long43000 KajangSelangorMalaysia Advanced Membrane Technology Research Centre(AMTEC) Universiti Teknologi Malaysia81310 SkudaiJohorMalaysia Department of Chemical Engineering Lee Kong Chian Faculty of Engineering and ScienceUniversiti Tunku Abdul RahmanJalan Bandar Sg.LongBandar Sg.Long43000 KajangSelangorMalaysia

In this study,a quantitative performance of three commercial polyamide nanofiltration(NF) membranes(i.e.,NF,NF90,and NF270) for phosphorus removal under different feed conditions was *** experiments were conducted at different feed phosphorus concentrations(2.5,5,10,and 15 mg·L^-1) and elevated pHs(pH 1.5,5,10,and 13.5) at a constant feed pressure of 1 MPa using a dead-end filtration *** rejection against total phosphorus generally increased with increasing phosphorus concentration regardless of membrane *** contrast,the permeate flux for all the membranes only decreased slightly with increasing phosphorus *** results also showed that the phosphorus rejections improved while water flux remained almost unchanged with increasing feed solution *** the three membranes were exposed to strong pHs(pH 1.5 and 13.5) for a longer duration(up to 6 weeks)it was found that the rejection capability and water flux of the membranes remained very similar throughout the duration,except for NF membrane with marginal decrement in phosphorus *** study also revealed that more phosphorus was adsorbed onto the membrane structure at alkaline conditions(pH 10 and 13.5) compared to the same membranes tested at lower pHs(pH 1.5 and 5).In eonelusion,NF270 membrane outperformed Nf and NF90 membranes owing to its desirable performance of water flux and phosphorus rejection particularly under strong alkali *** NF270 membrane achieved 14.0 L·m^-2·h^-1 and 96.5% rejection against 10 mg·L^-1 phosphorus solution with a pH value of 13.5 at the applied pressure of 1 MPa.

关键词： Membrane Nanofiltration Phosphorus removal pH Stability Humic acid

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