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Kim KW, Seok H, Son S, Park SJ, Yang C, Lee D, Lee HC, Mun J, Yeom HJ, Yoon MY, Park B, Kim SH, Jo C, Moon HC, Kim T, Kim JK. Low-Temperature, Universal Synthetic Route for Mesoporous Metal Oxides by Exploiting Synergistic Effect of Thermal Activation and Plasma. Adv Mater 2024; 36:e2311809. [PMID: 38241612 DOI: 10.1002/adma.202311809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 01/03/2024] [Indexed: 01/21/2024]
Abstract
Mesoporous metal oxides exhibit excellent physicochemical properties and are widely used in various fields, including energy storage/conversion, catalysis, and sensors. Although several soft-template approaches are reported, high-temperature calcination for both metal oxide formation and template removal is necessary, which limits direct synthesis on a plastic substrate for flexible devices. Here, a universal synthetic approach that combines thermal activation and oxygen plasma to synthesize diverse mesoporous metal oxides (V2O5, V6O13, TiO2, Nb2O5, WO3, and MoO3) at low temperatures (150-200 °C), which can be applicable to a flexible polymeric substrate is introduced. As a demonstration, a flexible micro-supercapacitor is fabricated by directly synthesizing mesoporous V2O5 on an indium-tin oxide-coated colorless polyimide film. The energy storage performance is well maintained under severe bending conditions.
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Affiliation(s)
- Keon-Woo Kim
- National Creative Research Initiative Center for Hybrid Nano Materials by High-level Architectural Design of Block Copolymer, Pohang, Gyeongbuk, 790-784, Republic of Korea
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, 790-784, Republic of Korea
| | - Hyunho Seok
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Republic of Korea
| | - Sihoon Son
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Republic of Korea
| | - Su-Jeong Park
- Advanced Nano-Surface & Wearable Electronics Research Laboratory, Heat and Surface Technology R&D Department, Korea Institute of Industrial Technology, Incheon, 21999, Republic of Korea
| | - Chanwoo Yang
- Advanced Nano-Surface & Wearable Electronics Research Laboratory, Heat and Surface Technology R&D Department, Korea Institute of Industrial Technology, Incheon, 21999, Republic of Korea
| | - Dongho Lee
- Department of Mechanical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Republic of Korea
| | - Hyo-Chang Lee
- Department of Semiconductor Science, Engineering and Technology, Korea Aerospace University, Goyang, 10540, Republic of Korea
| | - Jihun Mun
- Advanced Instrumentation Institute, Korea Research Institute of Standards and Science, Daejeon, 34113, Republic of Korea
| | - Hee-Jung Yeom
- Advanced Instrumentation Institute, Korea Research Institute of Standards and Science, Daejeon, 34113, Republic of Korea
| | - Min Young Yoon
- Advanced Instrumentation Institute, Korea Research Institute of Standards and Science, Daejeon, 34113, Republic of Korea
| | - Bomi Park
- National Creative Research Initiative Center for Hybrid Nano Materials by High-level Architectural Design of Block Copolymer, Pohang, Gyeongbuk, 790-784, Republic of Korea
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, 790-784, Republic of Korea
| | - Se Hyun Kim
- Division of Chemical Engineering, Konkuk University, Seoul, 05029, Republic of Korea
| | - Changshin Jo
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, 790-784, Republic of Korea
- Graduate Institute of Ferrous & Energy Materials Technology (GIFT), Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, 790-784, Republic of Korea
| | - Hong Chul Moon
- Department of Chemical Engineering, University of Seoul, Seoul, 02504, Republic of Korea
| | - Taesung Kim
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Republic of Korea
| | - Jin Kon Kim
- National Creative Research Initiative Center for Hybrid Nano Materials by High-level Architectural Design of Block Copolymer, Pohang, Gyeongbuk, 790-784, Republic of Korea
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, 790-784, Republic of Korea
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Lee J, Kim E, Cho J, Seok H, Woo G, Yu D, Jung G, Hwangbo H, Na J, Im I, Kim T. Remote-Controllable Interfacial Electron Tunneling at Heterogeneous Molecular Junctions via Tip-Induced Optoelectrical Engineering. Adv Sci (Weinh) 2024; 11:e2305512. [PMID: 38057140 PMCID: PMC10837351 DOI: 10.1002/advs.202305512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 10/31/2023] [Indexed: 12/08/2023]
Abstract
Molecular electronics enables functional electronic behavior via single molecules or molecular self-assembled monolayers, providing versatile opportunities for hybrid molecular-scale electronic devices. Although various molecular junction structures are constructed to investigate charge transfer dynamics, significant challenges remain in terms of interfacial charging effects and far-field background signals, which dominantly block the optoelectrical observation of interfacial charge transfer dynamics. Here, tip-induced optoelectrical engineering is presented that synergistically correlates photo-induced force microscopy and Kelvin probe force microscopy to remotely control and probe the interfacial charge transfer dynamics with sub-10 nm spatial resolution. Based on this approach, the optoelectrical origin of metal-molecule interfaces is clearly revealed by the nanoscale heterogeneity of the tip-sample interaction and optoelectrical reactivity, which theoretically aligned with density functional theory calculations. For a practical device-scale demonstration of tip-induced optoelectrical engineering, interfacial tunneling is remotely controlled at a 4-inch wafer-scale metal-insulator-metal capacitor, facilitating a 5.211-fold current amplification with the tip-induced electrical field. In conclusion, tip-induced optoelectrical engineering provides a novel strategy to comprehensively understand interfacial charge transfer dynamics and a non-destructive tunneling control platform that enables real-time and real-space investigation of ultrathin hybrid molecular systems.
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Affiliation(s)
- Jinhyoung Lee
- School of Mechanical Engineering, Sungkyunkwan University (SKKU), Suwon-si, Gyeonggi-do, 16419, Republic of Korea
| | - Eungchul Kim
- AVP process development team, Samsung Electronics, Cheonan-si, Chungcheongnam-do, 31086, South Korea
| | - Jinill Cho
- School of Mechanical Engineering, Sungkyunkwan University (SKKU), Suwon-si, Gyeonggi-do, 16419, Republic of Korea
| | - Hyunho Seok
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 16419, Republic of Korea
- Department of Nano Science and Technology, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Gunhoo Woo
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 16419, Republic of Korea
- Department of Nano Science and Technology, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Dayoung Yu
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 16419, Republic of Korea
- Department of Nano Science and Technology, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Gooeun Jung
- Park Systems Corp, R&D Center, Suwon, 16229, Republic of Korea
| | - Hyeon Hwangbo
- Park Systems Corp, R&D Center, Suwon, 16229, Republic of Korea
| | - Jinyoung Na
- Park Systems Corp, R&D Center, Suwon, 16229, Republic of Korea
| | - Inseob Im
- Park Systems Corp, R&D Center, Suwon, 16229, Republic of Korea
| | - Taesung Kim
- School of Mechanical Engineering, Sungkyunkwan University (SKKU), Suwon-si, Gyeonggi-do, 16419, Republic of Korea
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 16419, Republic of Korea
- Department of Nano Science and Technology, Sungkyunkwan University, Suwon, 16419, Republic of Korea
- Department of Nano Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea
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Kim KW, Park B, Kim J, Seok H, Kim T, Jo C, Kim JK. Block Copolymer-Directed Facile Synthesis of N-Doped Mesoporous Graphitic Carbon for Reliable, High-Performance Zn Ion Hybrid Supercapacitor. ACS Appl Mater Interfaces 2023; 15:57905-57912. [PMID: 37040434 DOI: 10.1021/acsami.3c02791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Ordered mesoporous carbons (OMCs) are promising materials for cathode materials of a Zn ion hybrid capacitor (Zn HC) due to their high surface area and interconnected porous structure. Graphitization of the framework and nitrogen doping have been used to improve the energy storage performance of the OMCs by enhancing electrical conductivity, pseudocapacitive reaction sites, and surface affinity toward aqueous electrolytes. Thus, when both methods are simultaneously implemented to the OMCs, the Zn HC would have improved energy storage performance. Herein, we introduce a facile synthetic method for N-doped mesoporous graphitic carbon (N-mgc) by utilizing polystyrene-block-poly(2-vinlypyridine) copolymer (PS-b-P2VP) as both soft-template and carbon/nitrogen sources. Co-assembly of PS-b-P2VP with Ni precursors for graphitization formed a mesostructured composite, which was converted to N-doped graphitic carbon through catalytic pyrolysis. After selective removal of Ni, N-mgc was prepared. The obtained N-mgc exhibited interconnected mesoporous structure with high nitrogen content and high surface area. When N-mgc was employed as a cathode material in Zn ion HC, excellent energy storage performance was achieved: a high specific capacitance (43 F/g at 0.2 A/g), a high energy density of 19.4 Wh/kg at a power density of 180 W/kg, and reliable cycle stability (>3000 cycles).
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Affiliation(s)
- Keon-Woo Kim
- National Creative Research Initiative Center for Hybrid Nano Materials by High-level Architectural Design of Block Copolymer, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk 37673, Republic of Korea
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk 37673, Republic of Korea
| | - Bomi Park
- National Creative Research Initiative Center for Hybrid Nano Materials by High-level Architectural Design of Block Copolymer, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk 37673, Republic of Korea
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk 37673, Republic of Korea
| | - Jun Kim
- National Creative Research Initiative Center for Hybrid Nano Materials by High-level Architectural Design of Block Copolymer, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk 37673, Republic of Korea
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk 37673, Republic of Korea
| | - Hyunho Seok
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea
| | - Taesung Kim
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea
- Department of Mechanical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea
| | - Changshin Jo
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk 37673, Republic of Korea
- Graduate Institute of Ferrous & Energy Materials Technology (GIFT), Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk 37673, Republic of Korea
| | - Jin Kon Kim
- National Creative Research Initiative Center for Hybrid Nano Materials by High-level Architectural Design of Block Copolymer, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk 37673, Republic of Korea
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk 37673, Republic of Korea
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Seok H, Son S, Jathar SB, Lee J, Kim T. Synapse-Mimetic Hardware-Implemented Resistive Random-Access Memory for Artificial Neural Network. Sensors (Basel) 2023; 23:3118. [PMID: 36991829 PMCID: PMC10058286 DOI: 10.3390/s23063118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 03/11/2023] [Accepted: 03/13/2023] [Indexed: 06/19/2023]
Abstract
Memristors mimic synaptic functions in advanced electronics and image sensors, thereby enabling brain-inspired neuromorphic computing to overcome the limitations of the von Neumann architecture. As computing operations based on von Neumann hardware rely on continuous memory transport between processing units and memory, fundamental limitations arise in terms of power consumption and integration density. In biological synapses, chemical stimulation induces information transfer from the pre- to the post-neuron. The memristor operates as resistive random-access memory (RRAM) and is incorporated into the hardware for neuromorphic computing. Hardware composed of synaptic memristor arrays is expected to lead to further breakthroughs owing to their biomimetic in-memory processing capabilities, low power consumption, and amenability to integration; these aspects satisfy the upcoming demands of artificial intelligence for higher computational loads. Among the tremendous efforts toward achieving human-brain-like electronics, layered 2D materials have demonstrated significant potential owing to their outstanding electronic and physical properties, facile integration with other materials, and low-power computing. This review discusses the memristive characteristics of various 2D materials (heterostructures, defect-engineered materials, and alloy materials) used in neuromorphic computing for image segregation or pattern recognition. Neuromorphic computing, the most powerful artificial networks for complicated image processing and recognition, represent a breakthrough in artificial intelligence owing to their enhanced performance and lower power consumption compared with von Neumann architectures. A hardware-implemented CNN with weight control based on synaptic memristor arrays is expected to be a promising candidate for future electronics in society, offering a solution based on non-von Neumann hardware. This emerging paradigm changes the computing algorithm using entirely hardware-connected edge computing and deep neural networks.
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Affiliation(s)
- Hyunho Seok
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
- Department of Nano Science and Technology, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Shihoon Son
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
- Department of Nano Science and Technology, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Sagar Bhaurao Jathar
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
- Department of Nano Science and Technology, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Jaewon Lee
- School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Taesung Kim
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
- Department of Nano Science and Technology, Sungkyunkwan University, Suwon 16419, Republic of Korea
- School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
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Kim KW, Kim J, Choi C, Yoon HK, Go MC, Lee J, Kim JK, Seok H, Kim T, Wu K, Kim SH, Kim YM, Kwon JH, Moon HC. Soft Template-Assisted Fabrication of Mesoporous Graphenes for High-Performance Energy Storage Systems. ACS Appl Mater Interfaces 2022; 14:46994-47002. [PMID: 36201256 DOI: 10.1021/acsami.2c12948] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Graphene is a promising active material for electric double layer supercapacitors (EDLCs) due to its high electric conductivity and lightweight nature. However, for practical uses as a power source of electronic devices, a porous structure is advantageous to maximize specific energy density. Here, we propose a facile fabrication approach of mesoporous graphene (m-G), in which self-assembled mesoporous structures of poly(styrene)-block-poly(2-vinylpyridine) copolymer (PS-b-P2VP) are exploited as both mesostructured catalytic template and a carbon source. Notably, the mesostructured catalytic template is sufficient to act as a rigid support without structural collapse, while PS-b-P2VP converts to graphene, generating m-G with a pore diameter of ca. 3.5 nm and high specific surface area of 186 m2/g. When the EDLCs were prepared using the obtained m-G and ionic liquids, excellent electrochemical behaviors were achieved even at high operation voltages (0 ∼ 3.5 V), including a large specific capacitance (130.2 F/g at 0.2 A/g), high-energy density of 55.4 W h/kg at power density of 350 W/kg, and excellent cycle stability (>10,000 cycles). This study demonstrates that m-G is a promising material for high-performance energy storage devices.
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Affiliation(s)
- Keon-Woo Kim
- National Creative Research Initiative Center for Hybrid Nano Materials By High-level Architectural Design of Block Copolymer Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk790-784, Republic of Korea
| | - Jun Kim
- National Creative Research Initiative Center for Hybrid Nano Materials By High-level Architectural Design of Block Copolymer Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk790-784, Republic of Korea
| | - Chungryong Choi
- Department of Polymer Science and Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi, Gyeongbuk39177, Republic of Korea
| | - Hyeong Keon Yoon
- National Creative Research Initiative Center for Hybrid Nano Materials By High-level Architectural Design of Block Copolymer Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk790-784, Republic of Korea
| | - Myeong Cheol Go
- National Creative Research Initiative Center for Hybrid Nano Materials By High-level Architectural Design of Block Copolymer Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk790-784, Republic of Korea
| | - Jaeyong Lee
- National Creative Research Initiative Center for Hybrid Nano Materials By High-level Architectural Design of Block Copolymer Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk790-784, Republic of Korea
| | - Jin Kon Kim
- National Creative Research Initiative Center for Hybrid Nano Materials By High-level Architectural Design of Block Copolymer Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk790-784, Republic of Korea
| | - Hyunho Seok
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, Gyeonggi-do16419, Republic of Korea
| | - Taesung Kim
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, Gyeonggi-do16419, Republic of Korea
| | - Kaibin Wu
- School of Chemical Engineering, Yeungnam University, Gyeongsan38541, Republic of Korea
| | - Se Hyun Kim
- Division of Chemical Engineering, Konkuk University, Seoul05029, Republic of Korea
| | - Yong Min Kim
- Department of Chemical Engineering, University of Seoul, Seoul02504, Republic of Korea
| | - Jin Han Kwon
- Department of Chemical Engineering, University of Seoul, Seoul02504, Republic of Korea
| | - Hong Chul Moon
- Department of Chemical Engineering, University of Seoul, Seoul02504, Republic of Korea
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Kim HU, Seok H, Kang WS, Kim T. The first progress of plasma-based transition metal dichalcogenide synthesis: a stable 1T phase and promising applications. Nanoscale Adv 2022; 4:2962-2972. [PMID: 36133517 PMCID: PMC9417878 DOI: 10.1039/d1na00882j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 04/24/2022] [Indexed: 06/16/2023]
Abstract
Two-dimensional (2D) transition metal dichalcogenides (TMDs) have attracted attention as polymorphs depending on their phases (1T and 2H) when applying typical synthesis methods. The 2H phase is generally synthesised through chemical vapour deposition (CVD) on a wafer-scale at high temperatures, and many synthesis methods have been reported owing to their thermodynamic stability and semiconductor properties. By contrast, although the 1T phase is meta-stable with an octahedral coordination, thereby limiting the use of synthesis methods, the recent structural advantage in terms of the hydrogen evolution reaction (HER) has been emphasised. Despite this demand, no large-area thin-film synthesis method for 1T-TMDs has been developed. Among several strategies of synthesizing metallic-phase (1T) TMDs, chemical exfoliation (alkali metal intercalation) is a major strategy and others have been used for electron-beam irradiation, laser irradiation, defects, plasma hot electron transfer, and mechanical strain. Therefore, we suggest an innovative synthesis method using plasma-enhanced CVD (PECVD) for both the 1T and 2H phases of TMDs (MoS2 and WS2). Because ions and radicals are accelerated to the substrate within the sheath region, a high-temperature source is not needed for vapour ionisation, and thus the process temperature can be significantly lowered (150 °C). Moreover, a 4-inch wafer-scale of a thin film is an advantage and can be synthesised on arbitrary substrates (SiO2/Si wafer, glassy carbon electrode, Teflon, and polyimide). Furthermore, the PECVD method was applied to TMD-graphene heterostructure films with a graphene-transferred substrate, and for the first time, sequential metal seed layer depositions of W (1 nm) and Mo (1 nm) were sulfurized to MoS2-WS2 vertical heterostructures with Ar + H2S plasma. We considered the prospects and challenges of the new PECVD method in the development of practical applications in next-generation integrated electronics, HER catalysts, and flexible biosensors.
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Affiliation(s)
- Hyeong-U Kim
- Department of Plasma Engineering, Korea Institute of Machinery & Materials (KIMM) Daejeon 34103 Korea
| | - Hyunho Seok
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University Suwon 16419 Korea
| | - Woo Seok Kang
- Department of Plasma Engineering, Korea Institute of Machinery & Materials (KIMM) Daejeon 34103 Korea
| | - Taesung Kim
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University Suwon 16419 Korea
- School of Mechanical Engineering, Sungkyunkwan University Suwon 16419 Korea
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Cho J, Seok H, Lee I, Lee J, Kim E, Sung D, Baek IK, Lee CH, Kim T. Activation of nitrogen species mixed with Ar and H 2S plasma for directly N-doped TMD films synthesis. Sci Rep 2022; 12:10335. [PMID: 35725747 PMCID: PMC9209500 DOI: 10.1038/s41598-022-14233-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 06/02/2022] [Indexed: 11/13/2022] Open
Abstract
Among the transition metal dichalcogenides (TMD), tungsten disulfide (WS2) and molybdenum disulfide (MoS2) are promising sulfides for replacing noble metals in the hydrogen evolution reaction (HER) owing to their abundance and good catalytic activity. However, the catalytic activity is derived from the edge sites of WS2 and MoS2, while their basal planes are inert. We propose a novel process for N-doped TMD synthesis for advanced HER using N2 + Ar + H2S plasma. The high ionization energy of Ar gas enabled nitrogen species activation results in efficient N-doping of TMD (named In situ-MoS2 and In situ-WS2). In situ-MoS2 and WS2 were characterized by various techniques (Raman spectroscopy, XPS, HR-TEM, TOF–SIMS, and OES), confirming nanocrystalline and N-doping. The N-doped TMD were used as electrocatalysts for the HER, with overpotentials of 294 mV (In situ-MoS2) and 298 mV (In situ-WS2) at a current density of 10 mA cm−2, which are lower than those of pristine MoS2 and WS2, respectively. Density functional theory (DFT) calculations were conducted for the hydrogen Gibbs energy (∆GH) to investigate the effect of N doping on the HER activity. Mixed gas plasma proposes a facile and novel fabrication process for direct N doping on TMD as a suitable HER electrocatalyst.
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Affiliation(s)
- Jinill Cho
- School of Mechanical Engineering, Sungkyunkwan University, Suwon, 16419, South Korea
| | - Hyunho Seok
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 16419, South Korea
| | - Inkoo Lee
- School of Mechanical Engineering, Sungkyunkwan University, Suwon, 16419, South Korea
| | - Jaewon Lee
- School of Mechanical Engineering, Sungkyunkwan University, Suwon, 16419, South Korea
| | - Eungchul Kim
- School of Mechanical Engineering, Sungkyunkwan University, Suwon, 16419, South Korea
| | - Dougyong Sung
- Samsung Electronic Co. Ltd., Mechatronics R&D Center, 1-1 Samsungjeonja-ro, Hwaseong-si, Gyeonggi-do, 18448, South Korea
| | - In-Keun Baek
- Samsung Electronic Co. Ltd., Mechatronics R&D Center, 1-1 Samsungjeonja-ro, Hwaseong-si, Gyeonggi-do, 18448, South Korea
| | - Cheol-Hun Lee
- Samsung Electronic Co. Ltd., Mechatronics R&D Center, 1-1 Samsungjeonja-ro, Hwaseong-si, Gyeonggi-do, 18448, South Korea
| | - Taesung Kim
- School of Mechanical Engineering, Sungkyunkwan University, Suwon, 16419, South Korea. .,SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 16419, South Korea.
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Cho J, Kim M, Seok H, Choi GH, Yoo SS, Sagaya Selvam NC, Yoo PJ, Kim T. Patchwork-Structured Heterointerface of 1T-WS 2/a-WO 3 with Sustained Hydrogen Spillover as a Highly Efficient Hydrogen Evolution Reaction Electrocatalyst. ACS Appl Mater Interfaces 2022; 14:24008-24019. [PMID: 35549071 DOI: 10.1021/acsami.2c03584] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Using tungsten disulfide (WS2) as a hydrogen evolution reaction (HER) electrocatalyst brought on several ways to surpass its intrinsic catalytic activity. This study introduces a nanodomain tungsten oxide (WO3) interface to 1T-WS2, opening a new route for facilitating the transfer of a proton to active sites, thereby enhancing the HER performance. After H2S plasma sulfurization on the W layer to realize nanocrystalline 1T-WS2, subsequent O2 plasma treatment led to the formation of amorphous WO3 (a-WO3), resulting in a patchwork-structured heterointerface of 1T-WS2/a-WO3 (WSO). Addition of a hydrophilic interface (WO3) facilitates the hydrogen spillover effect, which represents the transfer of absorbed protons from a-WO3 to 1T-WS2. Moreover, the faster response of the cathodic current peak (proton insertion) in cyclic voltammetry is confirmed by the higher degree of oxidation. The rationale behind the faster proton insertion is that the introduced a-WO3 works as a proton channel. As a result, WSO-1.2 (the ratio of 1T-WS2 to a-WO3) exhibits a remarkable HER activity in that 1T-WS2 consumes more protons provided by the channel, showing an overpotential of 212 mV at 10 mA/cm2. Density functional theory calculations also show that the WO3 phase gives higher binding energies for initial proton adsorption, while the 1T-WS2 phase shows reduced HER overpotential. This improved catalytic performance demonstrates a novel strategy for water splitting to actively elicit the related reaction via efficient proton transport.
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Affiliation(s)
- Jinill Cho
- School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Minjun Kim
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Hyunho Seok
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Gwan Hyun Choi
- School of Chemical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Seong Soo Yoo
- School of Chemical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | | | - Pil J Yoo
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
- School of Chemical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Taesung Kim
- School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
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9
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Kim E, Hong J, Seok H, Kim T. Photo-oxidative degradation of polyacids derived ceria nanoparticle modulation for chemical mechanical polishing. Sci Rep 2022; 12:1613. [PMID: 35102147 PMCID: PMC8803865 DOI: 10.1038/s41598-021-03866-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 12/06/2021] [Indexed: 11/17/2022] Open
Abstract
The effects of photo-oxidative degradation of polyacids at various concentrations and with different durations of ultraviolet (UV) irradiation on the photo-reduction of ceria nanoparticles were investigated. The effect of UV-treated ceria on the performance of chemical mechanical polishing (CMP) for the dielectric layer was also evaluated. When the polyacids were exposed to UV light, they underwent photo-oxidation with consumption of the dissolved oxygen in slurry. UV-treated ceria particles formed oxygen vacancies by absorbing photon energy, resulting in increased Ce3+ ions concentration on the surface, and when the oxygen level of the solution was lowered by the photo-oxidation of polymers, the formation of Ce3+ ions was promoted from 14.2 to 36.5%. Furthermore, chain scissions of polymers occurred during the oxidation process, and polyacids with lower molecular weights were found to be effective in ceria particle dispersion in terms of the decrease in the mean diameter and size distribution maintaining under 0.1 of polydispersity index. With increasing polyacid concentration and UV irradiation time, the Ce3+ concentration and the dispersity of ceria both increased due to the photo-oxidative degradation of the polymer; this enhanced the CMP performance in terms of 87% improved material removal rate and 48% lowered wafer surface roughness.
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Affiliation(s)
- Eungchul Kim
- School of Mechanical Engineering, Sungkyunkwan University, Suwon, 16419, South Korea
| | - Jiah Hong
- School of Mechanical Engineering, Sungkyunkwan University, Suwon, 16419, South Korea
| | - Hyunho Seok
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 16419, South Korea
| | - Taesung Kim
- School of Mechanical Engineering, Sungkyunkwan University, Suwon, 16419, South Korea. .,SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 16419, South Korea.
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10
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Kim E, Lee J, Bae C, Seok H, Kim HU, Kim T. Effects of trivalent lanthanide (La and Nd) doped ceria abrasives on chemical mechanical polishing. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2021.11.069] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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11
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Kim HU, Koyappayil A, Seok H, Aydin K, Kim C, Park KY, Jeon N, Kang WS, Lee MH, Kim T. Concurrent and Selective Determination of Dopamine and Serotonin with Flexible WS 2 /Graphene/Polyimide Electrode Using Cold Plasma. Small 2021; 17:e2102757. [PMID: 34558185 DOI: 10.1002/smll.202102757] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2021] [Revised: 08/24/2021] [Indexed: 06/13/2023]
Abstract
Makers of point-of-care devices and wearable diagnostics prefer flexible electrodes over conventional electrodes. In this study, a flexible electrode platform is introduced with a WS2 /graphene heterostructure on polyimide (WGP) for the concurrent and selective determination of dopamine and serotonin. The WGP is fabricated directly via plasma-enhanced chemical vapor deposition (PECVD) at 150 °C on a flexible polyimide substrate. Owing to the limitations of existing fabrication methods from physical transfer or hydrothermal methods, many studies are not conducted despite excellent graphene-based heterostructures. The PECVD synthesis method can provide an innovative WS2 /graphene heterostructure of uniform quality and sufficient size (4 in.). This unique heterostructure affords excellent electrical conductivity in graphene and numerous electrochemically active sites in WS2 . A large number of uniform qualities of WGP electrodes show reproducible and highly sensitive electrochemical results. The synergistic effect enabled well-separated voltammetric signals for dopamine and serotonin with a potential gap of 188 mV. Moreover, the practical application of the flexible sensor is successfully evaluated by using artificial cerebrospinal fluid.
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Affiliation(s)
- Hyeong-U Kim
- Department of Plasma Engineering, Korea Institute of Machinery and Materials (KIMM), Daejeon, 34103, Korea
| | - Aneesh Koyappayil
- School of Integrative Engineering, Chung-Ang University, Seoul, 06973, Korea
| | - Hyunho Seok
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do, 16419, Korea
| | - Kubra Aydin
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do, 16419, Korea
| | - Changmin Kim
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do, 16419, Korea
| | - Kyu-Young Park
- Graduate Institute of Ferrous and Energy Materials Technology, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Nari Jeon
- Department Materials Science and Engineering, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Woo Seok Kang
- Department of Plasma Engineering, Korea Institute of Machinery and Materials (KIMM), Daejeon, 34103, Korea
| | - Min-Ho Lee
- School of Integrative Engineering, Chung-Ang University, Seoul, 06973, Korea
| | - Taesung Kim
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do, 16419, Korea
- School of Mechanical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Korea
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12
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Seok H, Lee I, Cho J, Sung D, Baek IK, Lee CH, Kim E, Jeon S, Park K, Kim T. Synthesis of vertically aligned wafer-scale tantalum disulfide using high-Ar/H 2S ratio plasma. Nanotechnology 2021; 33:025603. [PMID: 34587601 DOI: 10.1088/1361-6528/ac2b6c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Accepted: 09/29/2021] [Indexed: 06/13/2023]
Abstract
Nanostructural modification of two-dimensional (2D) materials has attracted significant attention for enhancing hydrogen evolution reaction (HER) activity. In this study, the nanostructure of TaS2films was controlled by controlling the Ar/H2S gas ratio used in plasma-enhanced chemical vapor deposition (PECVD). At a high Ar/H2S gas ratio, vertically aligned TaS2(V-TaS2) films were formed over a large-area (4 in) at a temperature of 250 °C, which, to the best of our knowledge, is the lowest temperature reported for PECVD. Furthermore, the plasma species formed in the injected gas at various Ar/H2S gas ratios were analyzed using optical emission spectroscopy to determine the synthesis mechanism. In addition, the 4 in wafer-scale V-TaS2was analyzed by x-ray photoelectron spectroscopy, transmission electron microscopy, and atomic force microscopy, and the HER performance of the as-synthesized TaS2fabricated with various Ar/H2S ratios was measured. The results revealed that, depending on the film structure of TaS2, the HER performance can be enhanced owing to its structural advantage. Furthermore, the excellent stability and robustness of V-TaS2was confirmed by conducting 1000 HER cycles and post-HER material characterization. This study provides important insights into the plasma-assisted nanostructural modification of 2D materials for application as enhanced electrocatalysts.
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Affiliation(s)
- Hyunho Seok
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Inkoo Lee
- School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Jinill Cho
- School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Dougyong Sung
- Samsung Electronics Co., Ltd, Mechatronics R&D Center, 1-1 Samsungjeonja-ro, Hwaseong-si, Gyeonggi-do 18448, Republic of Korea
| | - In-Keun Baek
- Samsung Electronics Co., Ltd, Mechatronics R&D Center, 1-1 Samsungjeonja-ro, Hwaseong-si, Gyeonggi-do 18448, Republic of Korea
| | - Cheol-Hun Lee
- Samsung Electronics Co., Ltd, Mechatronics R&D Center, 1-1 Samsungjeonja-ro, Hwaseong-si, Gyeonggi-do 18448, Republic of Korea
| | - Eungchul Kim
- School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Sanghuck Jeon
- School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Kihong Park
- School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Taesung Kim
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
- School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
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13
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Lee CH, Seok H, Jang W, Kim JT, Park G, Kim HU, Rho J, Kim T, Chung TD. Bioaerosol monitoring by integrating DC impedance microfluidic cytometer with wet-cyclone air sampler. Biosens Bioelectron 2021; 192:113499. [PMID: 34311208 PMCID: PMC8275843 DOI: 10.1016/j.bios.2021.113499] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 06/27/2021] [Accepted: 07/08/2021] [Indexed: 12/17/2022]
Abstract
The recent outbreak of COVID-19 has highlighted the seriousness of airborne diseases and the need for a proper pathogen detection system. Compared to the ample amount of research on biological detection, work on integrated devices for air monitoring is rare. In this work, we integrated a wet-cyclone air sampler and a DC impedance microfluidic cytometer to build a cyclone-cytometer integrated air monitor (CCAM). The wet-cyclone air sampler sucks the air and concentrates the bioaerosols into 10 mL of aqueous solvent. After 5 min of air sampling, the bioaerosol-containing solution was conveyed to the microfluidic cytometer for detection. The device was tested with aerosolized microbeads, dust, and Escherichia coli (E. coli). CCAM is shown to differentiate particles from 0.96 to 2.95 μm with high accuracy. The wet cyclone air-sampler showed a 28.04% sampling efficiency, and the DC impedance cytometer showed 87.68% detection efficiency, giving a total of 24.59% overall CCAM efficiency. After validation of the device performance, CCAM was used to detect bacterial aerosols and their viability without any separate pretreatment step. Differentiation of dust, live E. coli, and dead E. coli was successfully performed by the addition of BacLight bacterial viability reagent in the sampling solvent. The usage could be further extended to detection of specific species with proper antibody fluorescent label. A promising strategy for aerosol detection is proposed through the constructive integration of a DC impedance microfluidic cytometer and a wet-cyclone air sampler.
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Affiliation(s)
- Chang Heon Lee
- Department of Chemistry, Seoul National University, Seoul, 08826, Republic of Korea
| | - Hyunho Seok
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Woohyuk Jang
- Department of Chemistry, Seoul National University, Seoul, 08826, Republic of Korea
| | - Ji Tae Kim
- Department of Chemistry, Seoul National University, Seoul, 08826, Republic of Korea
| | - Geunsang Park
- School of Mechanical Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Hyeong-U Kim
- Plasma Engineering Laboratory, Korea Institute of Machinery and Materials, Daejeon, 32103, Republic of Korea
| | - Jihun Rho
- Department of Chemistry, Seoul National University, Seoul, 08826, Republic of Korea
| | - Taesung Kim
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 16419, Republic of Korea; School of Mechanical Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea.
| | - Taek Dong Chung
- Department of Chemistry, Seoul National University, Seoul, 08826, Republic of Korea.
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Kim HU, Kim M, Seok H, Park KY, Moon JY, Park J, An BS, Jung HJ, Dravid VP, Whang D, Lee JH, Kim T. Realization of Wafer-Scale 1T-MoS 2 Film for Efficient Hydrogen Evolution Reaction. ChemSusChem 2021; 14:1344-1350. [PMID: 33400358 DOI: 10.1002/cssc.202002578] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 12/20/2020] [Indexed: 06/12/2023]
Abstract
The octahedral structure of 2D molybdenum disulfide (1T-MoS2 ) has attracted attention as a high-efficiency and low-cost electrocatalyst for hydrogen production. However, the large-scale synthesis of 1T-MoS2 films has not been realized because of higher formation energy compared to that of the trigonal prismatic phase (2H)-MoS2 . In this study, a uniform wafer-scale synthesis of the metastable 1T-MoS2 film is performed by sulfidation of the Mo metal layer using a plasma-enhanced chemical vapor deposition (PE-CVD) system. Thus, plasma-containing highly reactive ions and radicals of the sulfurization precursor enable the synthesis of 1T-MoS2 at 150 °C. Electrochemical analysis of 1T-MoS2 shows enhanced catalytic activity for the hydrogen evolution reaction (HER) compared to that of previously reported MoS2 electrocatalysts 1T-MoS2 does not transform into stable 2H-MoS2 even after 1000 cycles of HER. The proposed low-temperature synthesis approach may offer a promising solution for the facile production of various metastable-phase 2D materials.
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Affiliation(s)
- Hyeong-U Kim
- Plasma Engineering Laboratory, Korea Institute of Machinery and Materials (KIMM), Daejeon, 34103, Korea
| | - Mansu Kim
- School of Advanced Material Science and Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Korea
| | - Hyunho Seok
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do, 16419, Korea
| | - Kyu-Young Park
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois, 60208, USA
| | - Ji-Yun Moon
- Department of Energy Systems Research and Department of Materials Science and Engineering, Ajou University, Suwon, Gyeonggi-do, 16499, Korea
| | - Jonghwan Park
- School of Advanced Material Science and Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Korea
| | - Byeong-Seon An
- Platform Technology Laboratory, Korea Institute of Energy Research, Daejeon, 34129, Korea
| | - Hee Joon Jung
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois, 60208, USA
- International Institute for Nanotechnology, Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE), Northwestern University, Evanston, IL, 60208, USA
| | - Vinayak P Dravid
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois, 60208, USA
- International Institute for Nanotechnology, Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE), Northwestern University, Evanston, IL, 60208, USA
| | - Dongmok Whang
- School of Advanced Material Science and Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Korea
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do, 16419, Korea
| | - Jae-Hyun Lee
- Department of Energy Systems Research and Department of Materials Science and Engineering, Ajou University, Suwon, Gyeonggi-do, 16499, Korea
| | - Taesung Kim
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do, 16419, Korea
- School of Mechanical Engineering, Sungkyunkwan University, Gyeonggi-do, 16419, Korea
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15
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Kanade CK, Seok H, Kanade VK, Aydin K, Kim HU, Mitta SB, Yoo WJ, Kim T. Low-Temperature and Large-Scale Production of a Transition Metal Sulfide Vertical Heterostructure and Its Application for Photodetectors. ACS Appl Mater Interfaces 2021; 13:8710-8717. [PMID: 33566560 DOI: 10.1021/acsami.0c19666] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The conventional synthesis of two-dimensional (2D) transition metal dichalcogenide (TMDC) heterostructures is low yielding and lack the heterojunction interface quality. The chemical vapor deposition (CVD) techniques have achieved high-quality heterostructure interfaces but require a high synthesis temperature (>600 °C) and have a low yield of heterostructures. Therefore, the large scale and high interface quality of TMDC heterojunctions using low-temperature synthesis methods are in demand. Here, high-quality, wafer-scale MoS2 and WS2 heterostructures with 2D interfaces were prepared by a one-step sulfurization of the molybdenum (Mo) and tungsten (W) precursors via plasma-enhanced CVD at a relatively low temperature (150 °C). The 4 inch wafer-scale synthesis of the MoS2-WS2 heterostructures was validated using various spectroscopic and microscopic techniques. Further, the photocurrent generation and photoswitching phenomenon of the so-obtained MoS2-WS2 heterostructures were studied. The photodevice prepared by the MoS2-WS2 heterostructures at 150 °C showed a photoresponsivity of 83.75 mA/W. The excellent photoresponse and faster photoswitching highlight the advantage of MoS2-WS2 heterostructures toward advanced photodetectors.
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Affiliation(s)
- Chaitanya Kaluram Kanade
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do 16419, Republic of Korea
| | - Hyunho Seok
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do 16419, Republic of Korea
| | - Vinit Kaluram Kanade
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do 16419, Republic of Korea
| | - Kubra Aydin
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do 16419, Republic of Korea
| | - Hyeong-U Kim
- Plasma Engineering Laboratory, Korea Institute of Machinery and Materials (KIMM), Daejeon 34103, Korea
| | - Sekhar Babu Mitta
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do 16419, Republic of Korea
| | - Won Jong Yoo
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do 16419, Republic of Korea
| | - Taesung Kim
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do 16419, Republic of Korea
- School of Mechanical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea
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16
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Seok H, Megra YT, Kanade CK, Cho J, Kanade VK, Kim M, Lee I, Yoo PJ, Kim HU, Suk JW, Kim T. Low-Temperature Synthesis of Wafer-Scale MoS 2-WS 2 Vertical Heterostructures by Single-Step Penetrative Plasma Sulfurization. ACS Nano 2021; 15:707-718. [PMID: 33411506 DOI: 10.1021/acsnano.0c06989] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Two-dimensional (2D) transition metal dichalcogenides (TMDs) have attracted considerable attention owing to their synergetic effects with other 2D materials, such as graphene and hexagonal boron nitride, in TMD-based heterostructures. Therefore, it is important to understand the physical properties of TMD-TMD vertical heterostructures for their applications in next-generation electronic devices. However, the conventional synthesis process of TMD-TMD heterostructures has some critical limitations, such as nonreproducibility and low yield. In this paper, we synthesize wafer-scale MoS2-WS2 vertical heterostructures (MWVHs) using plasma-enhanced chemical vapor deposition (PE-CVD) via penetrative single-step sulfurization discovered by time-dependent analysis. This method is available for fabricating uniform large-area vertical heterostructures (4 in.) at a low temperature (300 °C). MWVHs were characterized using various spectroscopic and microscopic techniques, which revealed their uniform nanoscale polycrystallinity and the presence of vertical layers of MoS2 and WS2. In addition, wafer-scale MWVHs diodes were fabricated and demonstrated uniform performance by current mapping. Furthermore, mode I fracture tests were performed using large double cantilever beam specimens to confirm the separation of the MWVHs from the SiO2/Si substrate. Therefore, this study proposes a synthesis mechanism for TMD-TMD heterostructures and provides a fundamental understanding of the interfacial properties of TMD-TMD vertical heterostructures.
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Affiliation(s)
- Hyunho Seok
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Yonas Tsegaye Megra
- School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Chaitanya K Kanade
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Jinill Cho
- School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Vinit K Kanade
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Minjun Kim
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Inkoo Lee
- School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Pil J Yoo
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
- School of Chemical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Hyeong-U Kim
- Plasma Engineering Laboratory, Korea Institute of Machinery and Materials, Daejeon 34103, Republic of Korea
| | - Ji Won Suk
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
- School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
- Department of Smart Fabrication Technology, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Taesung Kim
- SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
- School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
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17
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Kim HU, Kim HY, Seok H, Kanade V, Yoo H, Park KY, Lee JH, Lee MH, Kim T. Flexible MoS2–Polyimide Electrode for Electrochemical Biosensors and Their Applications for the Highly Sensitive Quantification of Endocrine Hormones: PTH, T3, and T4. Anal Chem 2020; 92:6327-6333. [DOI: 10.1021/acs.analchem.9b05172] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Hyeong-U Kim
- Department of Materials Science and Engineering, Northwestern University, Evanston 60208, United States
| | - Hye Youn Kim
- School of Integrative Engineering, Chung-Ang University, Seoul 06973, Republic of Korea
| | | | | | - Hocheon Yoo
- Department of Electronic Engineering, Gachon University, Seongnam 13120, Republic of Korea
| | - Kyu-Young Park
- Department of Materials Science and Engineering, Northwestern University, Evanston 60208, United States
| | - Jae-Hyun Lee
- Department of Energy Systems Research and Department of Materials Science and Engineering, Ajou University, Suwon 16499, Republic of Korea
| | - Min-Ho Lee
- School of Integrative Engineering, Chung-Ang University, Seoul 06973, Republic of Korea
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Seok H, Song J, Jeon JH, Choi HK, Choi WS, Moon S, Park DW. Timing of antibiotics in septic patients: a prospective cohort study. Clin Microbiol Infect 2020; 26:1495-1500. [PMID: 32062049 DOI: 10.1016/j.cmi.2020.01.037] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 01/30/2020] [Accepted: 01/31/2020] [Indexed: 12/24/2022]
Abstract
OBJECTIVES To evaluate the effect of timing and appropriateness of antibiotics administration on mortality in patients diagnosed with sepsis according to the Sepsis-3 definition. METHODS This prospective cohort study was conducted in patients diagnosed with sepsis according to the Sepsis-3 definition at the emergency department of Korea University Ansan Hospital from January 2016 to January 2019. The time to antibiotics was defined as the time in hours from emergency department arrival to the first antibiotic administration. Cox proportional hazards regression analysis was used to estimate the association between time to antibiotics and 7-, 14- and 28-day mortality. RESULTS Of 482 patients enrolled onto this study, 203 (42.1%) of 482 and 312 (64.7%) of 482 were diagnosed with septic shock and high-grade infection respectively. The median time to receipt of antibiotic therapy was 115 minutes. Antibiotics were administered within 3 and 6 hours in 340 (70.4%) of 482 and 450 (93.2%) of 482 patients respectively. Initial appropriate empirical antibiotics were administered in 375 (77.8%) of 482 patients. The time to and appropriateness of the initial antibiotics were not associated with 7-, 14- and 28-day mortality in multivariate analysis. The Sequential Organ Failure Assessment (SOFA) score (adjusted hazard ratio (aHR) 1.229, 95% confidence interval (CI) 1.093-1.381, p 0.001) and initial lactate levels (aHR 1.128, 95% CI 1.034-1.230, p 0.007), Charlson comorbidity index (aHR 1.115, 95% CI 1.027-1.210, p 0.014), 2-hour lactate level (aHR 1.115, 95% CI 1.027-1.210, p 0.009) and SOFA score (aHR 1.077, 95% CI 1.013-1.144, p 0.018) affected 7-, 14- and 28-day mortality respectively. Subgroup analysis with septic shock, bacteraemia and high-grade infection did not affect mortality rates. CONCLUSIONS Time to receipt of antibiotics may not affect the prognosis of patients with sepsis if a rapid and well-trained resuscitation is combined with appropriate antibiotic administration within a reasonable time.
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Affiliation(s)
- H Seok
- Division of Infectious Diseases, Department of Medicine, Republic of Korea
| | - J Song
- Department of Emergency Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Republic of Korea
| | - J H Jeon
- Division of Infectious Diseases, Department of Medicine, Republic of Korea
| | - H K Choi
- Division of Infectious Diseases, Department of Medicine, Republic of Korea
| | - W S Choi
- Division of Infectious Diseases, Department of Medicine, Republic of Korea
| | - S Moon
- Department of Emergency Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Republic of Korea
| | - D W Park
- Division of Infectious Diseases, Department of Medicine, Republic of Korea.
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19
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Kim HU, Kanade V, Kim M, Kim KS, An BS, Seok H, Yoo H, Chaney LE, Kim SI, Yang CW, Yeom GY, Whang D, Lee JH, Kim T. Wafer-Scale and Low-Temperature Growth of 1T-WS 2 Film for Efficient and Stable Hydrogen Evolution Reaction. Small 2020; 16:e1905000. [PMID: 31916688 DOI: 10.1002/smll.201905000] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Revised: 11/25/2019] [Indexed: 06/10/2023]
Abstract
The metallic 1T phase of WS2 (1T-WS2 ), which boosts the charge transfer between the electron source and active edge sites, can be used as an efficient electrocatalyst for the hydrogen evolution reaction (HER). As the semiconductor 2H phase of WS2 (2H-WS2 ) is inherently stable, methods for synthesizing 1T-WS2 are limited and complicated. Herein, a uniform wafer-scale 1T-WS2 film is prepared using a plasma-enhanced chemical vapor deposition (PE-CVD) system. The growth temperature is maintained at 150 °C enabling the direct synthesis of 1T-WS2 films on both rigid dielectric and flexible polymer substrates. Both the crystallinity and number of layers of the as-grown 1T-WS2 are verified by various spectroscopic and microscopic analyses. A distorted 1T structure with a 2a0 × a0 superlattice is observed using scanning transmission electron microscopy. An electrochemical analysis of the 1T-WS2 film demonstrates its similar catalytic activity and high durability as compared to those of previously reported untreated and planar 1T-WS2 films synthesized with CVD and hydrothermal methods. The 1T-WS2 does not transform to stable 2H-WS2 , even after a 700 h exposure to harsh catalytic conditions and 1000 cycles of HERs. This synthetic strategy can provide a facile method to synthesize uniform 1T-phase 2D materials for electrocatalysis applications.
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Affiliation(s)
- Hyeong-U Kim
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do, 16419, Korea
| | - Vinit Kanade
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do, 16419, Korea
| | - Mansu Kim
- School of Advanced Material Science and Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Korea
| | - Ki Seok Kim
- School of Advanced Material Science and Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Korea
| | - Byeong-Seon An
- School of Advanced Material Science and Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Korea
| | - Hyunho Seok
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do, 16419, Korea
| | - Hocheon Yoo
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
- Department of Creative IT Engineering, POSTECH, Pohang, 37673, Korea
| | - Lindsay E Chaney
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - Seung-Il Kim
- Department of Energy Systems Research and Department of Materials Science and Engineering, Ajou University, Suwon, Gyeonggi-do, 16499, Korea
| | - Cheol-Woong Yang
- School of Advanced Material Science and Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Korea
| | - Geun Yong Yeom
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do, 16419, Korea
- School of Advanced Material Science and Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Korea
| | - Dongmok Whang
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do, 16419, Korea
- School of Advanced Material Science and Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Korea
| | - Jae-Hyun Lee
- Department of Energy Systems Research and Department of Materials Science and Engineering, Ajou University, Suwon, Gyeonggi-do, 16499, Korea
| | - Taesung Kim
- SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do, 16419, Korea
- School of Mechanical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Korea
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Ko JH, Müller MA, Seok H, Park GE, Lee JY, Cho SY, Ha YE, Baek JY, Kim SH, Kang JM, Kim YJ, Jo IJ, Chung CR, Hahn MJ, Drosten C, Kang CI, Chung DR, Song JH, Kang ES, Peck KR. Suggested new breakpoints of anti-MERS-CoV antibody ELISA titers: performance analysis of serologic tests. Eur J Clin Microbiol Infect Dis 2017; 36:2179-2186. [PMID: 28695355 PMCID: PMC7087918 DOI: 10.1007/s10096-017-3043-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Accepted: 06/04/2017] [Indexed: 01/03/2023]
Abstract
To provide optimal cut-off values of anti-Middle East respiratory syndrome coronavirus (MERS-CoV) serologic tests, we evaluated performance of ELISA IgG, ELISA IgA, IFA IgM, and IFA IgG using 138 serum samples of 49 MERS-CoV-infected patients and 219 serum samples of 219 rRT-PCR-negative MERS-CoV-exposed healthcare personnel and patients. The performance analysis was conducted for two different purposes: (1) prediction of neutralization activity in MERS-CoV-infected patients, and (2) epidemiologic surveillance of MERS-CoV infections among MERS-CoV-exposed individuals. To evaluate performance according to serum collection time, we used ‘days post onset of illness (dpoi)’ and ‘days post exposure (dpex)’ assessing neutralization activity and infection diagnosis, respectively. Performance of serologic tests improved with delayed sampling time, being maximized after a seroconversion period. In predicting neutralization activity, ELISA IgG tests showed optimal performance using sera collected after 21 dpoi at cut-off values of OD ratio 0.4 (sensitivity 100% and specificity 100%), and ELISA IgA showed optimal performance using sera collected after 14 dpoi at cut-off value of OD ratio 0.2 (sensitivity 85.2% and specificity 100%). In diagnosis of MERS-CoV infection, ELISA IgG exhibited optimal performance using sera collected after 28 dpex, at a cut-off value of OD ratio 0.2 (sensitivity 97.3% and specificity 92.9%). These new breakpoints are markedly lower than previously suggested values (ELISA IgG OD ratio 1.1, sensitivity 34.8% and specificity 100% in the present data set), and the performance data help serologic tests to be practically used in the field of MERS management.
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Affiliation(s)
- J-H Ko
- Division of Infectious Diseases, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 135-710, Republic of Korea.,Division of Infectious Diseases, Department of Internal Medicine, Armed Forces Capital Hospital, Seongnam, South Korea
| | - M A Müller
- Institute of Virology, Charité - Universitätsmedizin Berlin, Helmut-Ruska-Haus Charitéplatz 1, 10117, Berlin, Germany.,German Centre for Infection Research, Braunschweig, Germany
| | - H Seok
- Division of Infectious Diseases, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 135-710, Republic of Korea
| | - G E Park
- Division of Infectious Diseases, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 135-710, Republic of Korea
| | - J Y Lee
- Division of Infectious Diseases, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 135-710, Republic of Korea
| | - S Y Cho
- Division of Infectious Diseases, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 135-710, Republic of Korea
| | - Y E Ha
- Division of Infectious Diseases, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 135-710, Republic of Korea
| | - J Y Baek
- Asia Pacific Foundation for Infectious Diseases (APFID), Seoul, Republic of Korea
| | - S H Kim
- Asia Pacific Foundation for Infectious Diseases (APFID), Seoul, Republic of Korea
| | - J-M Kang
- Division of Infectious Diseases, Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Y-J Kim
- Division of Infectious Diseases, Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - I J Jo
- Department of Emergency Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - C R Chung
- Department of Critical Care Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - M-J Hahn
- Department of Molecular Cell Biology, Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, 440-746, South Korea
| | - C Drosten
- Institute of Virology, Charité - Universitätsmedizin Berlin, Helmut-Ruska-Haus Charitéplatz 1, 10117, Berlin, Germany.,German Centre for Infection Research, Braunschweig, Germany
| | - C-I Kang
- Division of Infectious Diseases, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 135-710, Republic of Korea
| | - D R Chung
- Division of Infectious Diseases, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 135-710, Republic of Korea.,Asia Pacific Foundation for Infectious Diseases (APFID), Seoul, Republic of Korea
| | - J-H Song
- Division of Infectious Diseases, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 135-710, Republic of Korea.,Asia Pacific Foundation for Infectious Diseases (APFID), Seoul, Republic of Korea
| | - E-S Kang
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
| | - K R Peck
- Division of Infectious Diseases, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 135-710, Republic of Korea.
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Park MS, Kim SK, Park HJ, Seok H, Kang SW, Lee SH, Kim YG, Moon JY, Kim TH, Kim YH, Kang SW, Chung JH, Jeong KH. Association Studies of Bone Morphogenetic Protein 2 Gene Polymorphisms With Acute Rejection in Kidney Transplantation Recipients. Transplant Proc 2017; 49:1012-1017. [PMID: 28583517 DOI: 10.1016/j.transproceed.2017.03.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Bone morphogenetic proteins (BMP) belong to the transforming growth factor beta superfamily of proteins. This study was performed to evaluate the association of BMP gene polymorphisms with acute renal allograft rejection (AR) and graft dysfunction (GD) in Koreans. METHODS Three hundred thirty-one patients who had kidney transplantation procedures were recruited. Transplantation outcomes were determined in terms of AR and GD criteria. We selected six single nucleotide polymorphisms (SNPs): rs1979855 (5' near gene), rs1049007 (Ser87Ser), rs235767 (intron), rs1005464 (intron), rs235768 (Arg190Ser), and rs3178250 (3; untranslated region). RESULTS Among the six SNPs tested, the rs235767, rs1005464, and rs3178250 SNPs were significantly associated with AR (P < .05). The rs1049007 and rs235768 SNPs also showed an association with GD (P < .05). CONCLUSIONS In conclusion, these results suggest that the BMP2 gene polymorphism may be related to the development of AR and GD in kidney transplant recipients.
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Affiliation(s)
- M-S Park
- Department of Surgery, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - S K Kim
- Kohwang Medical Research Institute, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - H J Park
- Kohwang Medical Research Institute, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - H Seok
- Kohwang Medical Research Institute, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - S W Kang
- Kohwang Medical Research Institute, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - S H Lee
- Department of Nephrology, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - Y G Kim
- Department of Nephrology, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - J Y Moon
- Department of Nephrology, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - T H Kim
- Department of Nephrology, School of Medicine, In Je University, Busan, Republic of Korea
| | - Y H Kim
- Department of Nephrology, School of Medicine, In Je University, Busan, Republic of Korea
| | - S W Kang
- Department of Nephrology, School of Medicine, In Je University, Busan, Republic of Korea
| | - J-H Chung
- Kohwang Medical Research Institute, School of Medicine, Kyung Hee University, Seoul, Republic of Korea.
| | - K H Jeong
- Department of Nephrology, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
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22
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Abstract
This study offers a comparative perspective of the social adjustment of migrant workers in Korea and local workers employed in Korean firms in four Asian countries. Data for the study came from surveys conducted in Korea (n=742 migrant workers from China, Indonesia, the Philippines and Vietnam) and Korean firms overseas (n=1,078 local workers in the same countries where migrants come from). In addition, interviews were also conducted for supervisors, managers and top managers of firms in Korea and overseas. The study found differences in perceptions of cultural gap and work conditions and levels of social adjustment by ethnic group and migration status. The persistence of ethnic differences in workers' social adjustment suggests the possible influence of cultural factors.
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23
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Seok H, Jung CH, Kim SW, Lee MJ, Lee WJ, Kim JH, Lee BW. Clinical characteristics and insulin independence of Koreans with new-onset type 2 diabetes presenting with diabetic ketoacidosis. Diabetes Metab Res Rev 2013; 29:507-13. [PMID: 23653323 DOI: 10.1002/dmrr.2421] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2012] [Revised: 12/29/2012] [Accepted: 04/07/2013] [Indexed: 11/10/2022]
Abstract
BACKGROUND We evaluated the incidence, characteristics and insulin independence of Koreans with new-onset type 2 diabetes (T2D) initially presenting with diabetic ketoacidosis (DKA). METHODS We analysed clinical and biochemical data from diabetic patients presenting with DKA. They were classified into ketosis-prone diabetes (KPD) type 1A (KPD-T1A) (A+β-), type 1B (KPD-T1B) (A-β-), type 2A (KPD-T2A) (A+β+) or type 2B (KPD-T2B) (A-β+) according to the presence or absence of an autoantibody and β-cell reserve. Changes in therapy after insulin discontinuation were evaluated for up to 4 years. We also compared clinical and biochemical characteristics between newly diagnosed T2D patients presenting with DKA and previously diagnosed T2D patients presenting with DKA. RESULTS Among 60 newly diagnosed KPD patients, 18, 21 and 21 patients were classified as KPD-T1A, KPD-T1B and KPD-T2B, respectively. In the KPD-T2B group, both fasting and stimulated C-peptide were recovered over 6 months. After 4 years of DKA development, 75% of KPD-T2B subjects no longer required insulin. Compared with previously diagnosed T2D patients presenting with DKA, newly diagnosed KPD-T2B patients tended to be younger, more obese and showed better insulin secretory function after recovery from DKA. CONCLUSIONS New-onset T2D patients presenting with DKA was not uncommon among the Korean population. In contrast to previously diagnosed T2D patients presenting with DKA, who showed a progressive decrease in insulin secretory function, new-onset KPD-T2B patients recovered insulin secretory function over time, and insulin independence could be expected.
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Affiliation(s)
- H Seok
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
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Karasu Y, Dilbaz B, Demir B, Dilbaz S, Secilmis Kerimoglu O, Ercan CM, Keskin U, Korkmaz C, Duru NK, Ergun A, de Zuniga I, Horton M, Oubina A, Scotti L, Abramovich D, Pascuali N, Tesone M, Parborell F, Bouzas N, Yang XH, Chen SL, Chen X, Ye DS, Zheng HY, Nyboe Andersen A, Lauritsen MP, Thuesen LL, Khodadadi M, Shivabasavaiah S, Mozafari R, Ansari Z, Hamdine O, Broekmans F, Eijkemans MJC, Cohlen BJ, Verhoeff A, van Dop PA, Bernardus RE, Lambalk CB, Oosterhuis GJE, Holleboom C, van den Dool-Maasland GC, Verburg HJ, van der Heijden PFM, Blankhart A, Fauser BCJM, Laven JSE, Macklon NS, Agudo D, Lopez C, Alonso M, Huguet E, Bronet F, Garcia-Velasco JA, Requena A, Gonzalez Comadran M, Checa MA, Duran M, Fabregues F, Carreras R, Ersahin A, Kahraman S, Kavrut M, Gorgen B, Acet M, Dokuzeylul N, Aybar F, Lim SY, Park JC, Bae JG, Kim JI, Rhee JH, Mahran A, Abdelmeged A, El-Adawy A, Eissa M, Darne J, Shaw RW, Amer SA, Dai A, Yan G, He Q, Hu Y, Sun H, Ferrero H, Gomez R, Garcia-Pascual CM, Simon C, Gaytan F, Pellicer A, Garcia Pascual CM, Zimmermann RC, Ferrero H, Simon C, Pellicer A, Gomez R, Madani T, Mohammadi Yeganeh L, Khodabakhshi SH, Akhoond MR, Hasani F, Monzo C, Haouzi D, Assou S, Dechaud H, Hamamah S, Amer S, Mahran M, Eissa M, Darne J, Shaw R, Lan V, Nhu G, Tuong H, Mahmoud Youssef MA, Aboulfoutouh I, Al-inany H, Van Der Veen F, Van Wely M, Zhang Q, Fang T, Wu S, Zhang L, Wang B, Li X, Yan G, Sun H, Hu Y, He Q, Ding L, Day A, Wang B, Yan G, Hu Y, Sun H, Zhang L, Fang T, Zhang Q, Wu S, Yan G, Sun H, Hu Y, Fulford B, Boivin J, Alanbay I, Ercan CM, Sakinci M, Coksuer H, Ozturk M, Tapan S, Chung CK, Chung Y, Seo S, Aksoy S, Yakin K, Caliskan S, Salar Z, Ata B, Urman B, Devroey P, Pellicer A, Nyboe Andersen A, Arce JC, Harrison K, Irving J, Osborn J, Harrison M, Fusi F, Arnoldi M, Cappato M, Galbignani E, Galimberti A, Zanga L, Frigerio L, Taghavi SA, Ashrafi M, Karimian L, Mehdizadeh M, Joghataie M, Aflatoonian R, Xu B, Cui YG, Gao LL, Diao FY, Li M, Liu XQ, Liu JY, Jiang F, Li M, Cui YG, Diao FY, Liu JY, Jee BC, Yi G, Kim JY, Suh CS, Kim SH, Liu S, Cui YG, Liu JY, Cai LB, Liu JJ, Ma X, Geenen E, Bots RSGM, Smeenk JMJ, Chang E, Lee W, Seok H, Kim Y, Han J, Yoon T, Lazaros L, Xita N, Zikopoulos K, Makrydimas G, Kaponis A, Sofikitis N, Stefos T, Hatzi E, Georgiou I, Atilgan R, Kumbak B, Sahin L, Ozkan ZS, Simsek M, Sapmaz E, Karacan M, Alwaeely FA, Cebi Z, Berberoglugil M, Ulug M, Camlibel T, Kavrut M, Kahraman S, Ersahin A, Acet M, Yelke H, Kamalak Z, Carlioglu A, Akdeniz D, Uysal S, Inegol Gumus I, Ozturk Turhan N, Regan S, Yovich J, Stanger J, Almahbobi G, Kara M, Aydin T, Turktekin N, Youssef M, Aboulfoutouh I, Al-Inany H, van der Veen F, van Wely M, Hart R, Doherty D, Frederiksen H, Keelan J, Pennell C, Newnham J, Skakkebaek N, Main K, Salem HT, Ismail AA, Viola M, Siebert TI, Steyn DW, Kruger TF, Robin G, Dewailly D, Thomas P, Leroy M, Lefebvre C, soudan B, Pigny P, Decanter C, ElPrince M, Wang F, Zhu Y, Huang H, Valdez Morales F, Vital Reyes V, Mendoza Rodriguez A, Gamboa Dominguez A, Cerbon M, Aizpurua J, Ramos B, Luehr B, Moragues I, Rogel S, Cil AP, Guler ZB, Kisa U, Albu A, Radian S, Grigorescu F, Albu D, Fica S, Al Boghdady L, Ghanem ME, Hassan M, Helal AS, Ozdogan S, Ozdegirmenci O, Dilbaz S, Demir B, Cinar O, Dilbaz B, Goktolga U, Seeber B, Tsybulyak I, Bottcher B, Grubinger T, Czech T, Wildt L, Wojcik J, Howles CM, Destenaves B, Arriagada P, Tavmergen E, Sahin G, Akdogan A, Levi R, Goker ENT, Thuesen LL, Loft A, Smitz J, Nyboe Andersen A, Ricciardi L, Di Florio C, Busacca M, Gagliano D, Immediata V, Selvaggi L, Romualdi D, Guido M, Bouhanna P, Salama S, Kamoud Z, Torre A, Paillusson B, Fuchs F, Bailly M, Wainer R, Tagliaferri V, Busacca M, Gagliano D, Di Florio C, Tartaglia C, Cirella E, Romualdi D, Guido M, Aflatoonian A, Eftekhar M, Mohammadian F, Yousefnejad F, De Cicco S, Gagliano D, Busacca M, Di Florio C, Immediata V, Campagna G, Romualdi D, Guido M, Depalo R, Lippolis C, Vacca M, Nardelli C, Selvaggi L, Cavallini A, Panic T, Mitulovic G, Franz M, Sator K, Tschugguel W, Pietrowski D, Hildebrandt T, Cupisti S, Giltay EJ, Gooren LJ, Oppelt PG, Hackl J, Reissmann C, Schulze C, Heusinger K, Attig M, Hoffmann I, Beckmann MW, Dittrich R, Mueller A, Sharma S, Singh S, Chakravarty A, Sarkar A, Rajani S, Chakravarty BN, Dilbaz S, Ozturk E, Ozdegirmenci O, Demir B, Isikoglu S, Kul S, Dilbaz B, Cinar O, Goktolga U, Eftekhar M, Aflatoonian A, Mohammadian F, Broekmans F, Hillensjo T, Witjes H, Elbers J, Mannaerts B, Gordon K, Krasnopolskaya K, Galaktionova A, Gorskaya O, Kabanova D, Venturella R, Morelli M, Mocciaro R, Capasso S, Cappiello F, Zullo F, Monterde M, Gomez R, Marzal A, Vega O, Rubio-Rubio JM, Diaz-Garcia C, Pellicer A, Gordon K, Kolibianakis E, Griesinger G, Yding Andersen C, Witjes H, Mannaerts B, Ocal P, Guralp O, Aydogan B, Irez T, Cetin M, Senol H, Erol N, Yding Andersen C, Kolibianakis E, Devroey P, Witjes H, Mannaerts B, Gordon K, Griesinger G, Rombauts L, Van Kuijk J, Mannaerts B, Montagut J, Nogueira D, Porcu G, Chomier M, Giorgetti C, Nicollet B, Degoy J, Lehert P, Alviggi C, De Rosa P, Vallone R, Picarelli S, Coppola M, Conforti A, Strina I, Di Carlo C, De Placido G, Hackl J, Cupisti S, Haeberle L, Schulze C, Hildebrandt T, Oppelt PG, Reissmann C, Heusinger K, Attig M, Hoffmann I, Dittrich R, Beckmann MW, Mueller A, Akdogan A, Demirtas O, Sahin G, Tavmergen E, Goker ENT, Fatemi H, Shapiro BS, Griesinger G, Witjes H, Gordon K, Mannaerts BM, Chimote MN, Mehta BN, Chimote NN, Nath NM, Chimote NM, Karia S, Bonifacio M, Bowman M, McArthur S, Jung J, Cho S, Choi Y, Lee B, Seo S, Lee KH, Kim CH, Kwon SK, Kim SH, Kang BM, Jung KS, Basios G, Trakakis E, Hatziagelaki E, Vaggopoulos V, Tsiavou A, Panagopoulos P, Chrelias C, Kassanos D, Sarhan A, Elsamanoudy A, Harira M, Dogan S, Bozdag G, Esinler I, Polat M, Yarali H. REPRODUCTIVE ENDOCRINOLOGY. Hum Reprod 2012. [DOI: 10.1093/humrep/27.s2.88] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Colakoglu M, Toy H, Icen MS, Vural M, Mahmoud AS, Yazici F, Buendgen N, Cordes T, Schultze-Mosgau A, Diedrich K, Beyer D, Griesinger G, Oude Loohuis EJ, Nahuis MJ, Bayram N, Hompes PGA, Oosterhuis GJE, Bossuyt PM, van der Veen F, Mol BWJ, van Wely M, Nahuis MJ, Oude Loohuis EJ, Kose N, Bayram N, Hompes PGA, Oosterhuis GJE, Bossuyt PM, van der Veen F, Mol BWJ, van Wely M, Yaba A, Demir N, Allegra A, Pane A, Marino A, Scaglione P, Ruvolo G, Manno M, Volpes A, Lunger F, Wildt L, Seeber B, Kolibianakis EM, Venetis CA, Bosdou J, Toulis K, Goulis DG, Tarlatzi TB, Tarlatzis BC, Franz M, Keck C, Daube S, Pietrowski D, Demir N, Yaba A, Iannetta R, Santos RDS, Lima TP, Giolo F, Iannetta O, Martins WP, Paula FJ, Ferriani RA, Rosa e Silva ACJS, Martinelli CE, Reis RM, Devesa M, Rodriguez I, Coroleu B, Tur R, Gonzalez C, Barri PN, Nardo LG, Mohiyiddeen L, Mulugeta B, McBurney H, Roberts SA, Newman WG, Grynberg M, Lamazou F, Even M, Gallot V, Frydman R, Fanchin R, Abdalla H, Nicopoullos J, Leader A, Pang S, Witjes H, Gordon K, Devroey P, Arrivi C, Ferraretti AP, Magli MC, Tartaglia ML, Fasolino MC, Gianaroli L, Macek sr. M, Feldmar P, Kluckova H, Hrehorcak M, Diblik J, Cernikova J, Paulasova P, Turnovec M, Macek jr. 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Autin C, Gustin ML, Delvigne A, Rozee V, Seok H, Bak CW, Lyu SW, Song S, Lee WS, Cho JH, Yoon TK, Jindal UN, Verma S, Bala Y. SELECTED ORAL COMMUNICATION SESSION, SESSION 53: CROSS BORDER REPRODUCTIVE CARE & ART IN DEVELOPING COUNTRIES, Tuesday 5 July 2011 17:00 - 18:00. Hum Reprod 2011. [DOI: 10.1093/humrep/26.s1.53] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Lim KB, Na YM, Seok H, Choi HJ. EFFECT OF THERAPEUTIC EXERCISE IN PATIENTS WITH OSTEOARTHRITIS OF KNEE. Med Sci Sports Exerc 2001. [DOI: 10.1097/00005768-200105001-00219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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