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Nano Research 2014年第5期7卷 717-730页

作者： Dohyuk Yoo jeonghun kim Jung Hyun kim Department of Chemical and Biomolecular Engineering Yonsei University 50 Yonsei-ro Seodaemun-gu Seou1120-749 Republic of Korea Electronic Materials Division R&D Center Dongjin Semichem Co. Ltd. 625-3 Yodang-Ri Yanggam-Myeon Hwaseong-Gun Gyeonggi-Do Republic of Korea

We report for the first time highly conductive poly（3,4-ethylenedioxythiophene）： poly（4-styrenesulfonate）（PEDOT：PSS）/graphene composites fabricated by in situ polymerization and their applications in a thermoelectric device and a platinum （Pt）-free dye-sensitized solar cell （DSSC） as energy harvesting systems. Graphene was dispersed in a solution of poly（4-styrenesulfonate）（PSS） and polymerization was directly carried out by addition of 3,4-ethylenedioxythiophene （EDOT） monomer to the dispersion. The content of the graphene was varied and optimized to give the highest electrical conductivity. The composite solution was ready to use without any reduction process because reduced graphene oxide was used. The fabricated film had a conductivity of 637 ***-1, corresponding to an enhancement of 41%, after the introduction of 3 wt.% graphene without any further complicated reduction processes of graphene being required. The highly conductive composite films were employed in an organic thermoelectric device, and the device showed a power factor of 45.7 μW·m^-1K^-2 which is 93% higher than a device based on pristine PEDOT：PSS. In addition, the highly conductive composite films were used in Pt-free DSSCs, showing an energy conversion efficiency of 5.4%, which is 21% higher than that of a DSSC based on PEDOT：PSS.

关键词： direct synthesis conductive polymer graphene composite thermoelectric material dye-sensitized solar cell

Isotropically resolved label-free tomographic imaging based on tomographic moulds for optical trapping

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Light(Science & Applications) 2021年第6期10卷 1061-1069页

作者： Moosung Lee Kyoohyun kim jeonghun Oh YongKeun Park Department of Physics Korea Advaneed In stitute of Science and Technology(KAIST)Daejeon 34141South Korea. KAIST Institute for Health Science and Technology KAISTDaejeon 34141South Korea. Tomocube Inc. Daejeon 34109South Korea. Present address:Max Planck Institute for the Science of Light Max-Planck-Zentrum fur Physik und Medizin 91058 ErlangenGermany

A major challenge in three-dimensional(3D)microscopy is to obtain accurate spatial information while simultaneously keeping the microscopic samples in their native *** conventional 3D microscopy,axial resolution is inferior to spatial resolution due to the inaccessibility to side scattering *** this study,we demonstrate the isotropic microtomography of free-floating samples by optically rotating a *** to previous approaches using optical tweezers with multiple foci which are only applicable to simple shapes,we exploited 3D structured light traps that can stably rotate freestanding complex-shaped microscopic specimens,and side scattering information is measured at various sample orientations to achieve isotropic *** proposed method yields an isotropic resolution of 230 nm and captures structural details of colloidal multimers and live red blood cells,which are inaccessible using conventional tomographic *** envision that the proposed approach can be deployed for solving diverse imaging problems that are beyond the examples shown here.

关键词： trapping details resolved

Investigation of operation and degradation mechanisms in ZnTeSe blue quantum-dot light-emitting diodes by identifying recombination zone

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Nano Research 2024年第7期17卷 6527-6533页

作者： Oul Cho Sujin Park Hogeun Chang Jiwhan kim Jaekwon kim Sungwoo kim Taehyung kim jeonghun Kwak Department of Electrical and Computer Engineering Inter-university Semiconductor Research Centerand Soft Foundry InstituteSeoul National UniversitySeoul 08826Republic of Korea Material Research Center Samsung Advanced Institute of TechnologySuwonGyeonggi-do 16419Republic of Korea

ZnTeSe quantum dots(QDs),recognized as promising eco-friendly blue electroluminescent emitters,remain under-explored in light-emitting diode(LED)***,to elucidate the operation and degradation mechanisms of ZnTeSe blue QD-LEDs,stacked ZnTeSe QD layers with discernable luminescence are designed by varying Te doping concentrations,and the recombination zones(RZs)of the blue QD-LEDs are *** RZs are identified near the hole-transport layer(HTL),confirmed by angular-dependent electroluminescence measurements and optical *** addition,in order to investigate carrier dynamics in the process of recombination,the transient electroluminescence(tr-EL)signals of the dichromatic QD-LEDs are *** a result,it is inferred that the RZ initially formed near the electron-transport layer(ETL)due to the high injection barriers of ***,due to the fast electron mobility,the RZ shifts toward the HTL as the operating current *** the device lifetime tests,the RZ remains stationary while the photoluminescence(PL)corresponding to the RZ undergoes a substantial decrease,indicating that the degradation is accelerated by the concentrated *** this study contributes to a deeper understanding of the operational mechanisms of ZnTeSe blue QD-LEDs.

关键词： quantum dots light-emitting diodes degradation recombination zones carrier dynamics

A clinical trial of submucosal saline injection in inverted colonic diverticula

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Chinese Medical Journal 2021年第12期134卷 1511-1512页

作者： jeonghun Lee Youngsun kim Department of Internal Medicine Ye HospitalAnyangKorea Department of Obstetrics and Gynecology Kyung Hee University HospitalKyung Hee University College of MedicineSeoulKorea

To the Editor:Colonic diverticulosis is a common colon disorder worldwide and is mostly observed in the right colon in Asian patients,unlike in western *** colonic diverticula(ICD)are less common and are observed in about 0.7%of colonoscopy *** ICD often resemble colon polyps,they are difficult to distinguish by ***,bowel perforation after biopsy or endoscopic resection may be a serious *** colonoscopy maneuvers described to help diagnose ICD include radiating pillow sign,the use of air insufflation and water jet,and reversion of the ICD with *** rings,most recently described as concentric pale rings surrounding the lesion,also can help to diagnose ICD without the need for *** present report describes the cases that underwent endoscopic maneuvers by submucosal saline *** results of this clinical trial may help to distinguish ICD from colon polyps.

关键词： injection colon colonic

Sigmoid-sigmoid colon fistula caused by diverticulitis

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Chinese Medical Journal 2022年第4期135卷 491-492页

作者： jeonghun Lee Young Joo Lee Youngsun kim Department of Internal Medicine Ye HospitalAnyangRepublic of Korea Department of Obstetrics and Gynecology Kyung Hee University HospitalKyung Hee University College of MedicineSeoulRepublic of Korea

To the Editor:Diverticular disease is common worldwide and the incidence of this disease increases with *** diverticulitis is serious and includes abscess,fistula,obstruction,and ***,surgical treatment is recommended to the patients with symptomatic *** these,colocolic fistula caused by diverticulitis is rare findings and especially,sigmoid-sigmoid fistula is an extremely rare *** present report describes a case of sigmoid-sigmoid colon fistula caused by *** results of this case may help physicians to recognize that multidisciplinary management and surgery are needed for the treatment of complicated diverticulitis with fistula.

关键词： fistula colon obstruction

High‑Performance Thick Cathode Based on Polyhydroxyalkanoate Binder for Li Metal Batteries

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Advanced Fiber Materials 2024年第1期6卷 214-228页

作者： Dong Hyuk Kang Minhyuck Park jeonghun Lee Chan Yeol kim Jimin Park Youn‑Ki Lee Jong Chan Hyun Son Ha Jin Hwan Kwak Juhee Yoon Hyemin kim Hyun Soo kim Do Hyun kim Sangmin kim Ji Yong Park Robin Jang Seung Jae Yang Hee‑Dae Lim Se Youn Cho Hyoung‑Joon Jin Seungjin Lee Yunil Hwang Young Soo Yun KU‑KIST Graduate School of Converging Science and Technology Korea University145 Anam‑roSeongbuk‑guSeoul 02841South Korea Carbon Composite Materials Research Center Korea Institute of Science and Technology(KIST)92 Chundong‑roBongdong‑eupWanju‑gunJeollabuk‑do 55324South Korea Energy Storage Research Center Korea Institute of Science and Technology(KIST)514‑gil Hwaraong‑roSeoul 02792South Korea Program in Environmental and Polymer Engineering Inha University100 Inha‑ro Michuhol‑guIncheon 22212South Korea Advanced Analysis Data Center Korea Institute of Science and Technology(KIST)514‑gil Hwaraong‑roSeoul 02792South Korea Advanced Nanohybrids Laboratory Department of Chemistry and Chemical EngineeringInha University100 Inha‑roMichuhol‑guIncheon 22212South Korea CJ CheilJedang Corporation 55 Gwanggyo‑ro 42Beon‑gilYeongtong‑guSuwon 16495South Korea Department of Chemical Engineering Hanyang University222 Wangsimni‑roSeongdong‑guSeoul 04763South Korea Department of Integrative Energy Engineering Korea University145 Anam‑roSeongbuk‑guSeoul 02841South Korea

Thick cathodes can overcome the low capacity issues,which mostly hamper the performance of the conventional active cathode materials,used in rechargeable Li ***,the typical slurry-based method induces cracking and flaking during the fabrication of thick *** addition,a significant increase in the charge-transfer resistance and local cur-rent overload results in poor rate capabilities and cycling stabilities,thereby limiting electrode *** this study,a synergistic dual-network combination strategy based on a conductive nanofibrillar network(CNN)and a nano-bridging amor-phous polyhydroxyalkanoate(aPHA)binder is used to demonstrate the feasibility of constructing a high-performance thick *** CNN and aPHA dual network facilitates the fabrication of a thick cathode(≥250μm thickness and≥90 wt%active cathode material)by a mass-producible slurry *** thick cathode exhibited a high rate capability and excel-lent cycling *** addition,the thick cathode and thin Li metal anode pair(Li//t-NCM)exhibited an optimal energy performance,affording high-performance Li metal batteries with a high areal energy of~25.3 mW h cm^(-2),a high volumetric power density of~1720 W L^(-1),and an outstanding specific energy of~470 W h kg^(-1)at only 6 mA h cm^(-2).

关键词： Thick cathode Polyhydroxyalkanoate binder Nano-bridging Conductive nano-fibrillar network Lithium metal battery