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Jesudass SC, Surendran S, Moon DJ, Shanmugapriya S, Kim JY, Janani G, Veeramani K, Mahadik S, Kim IG, Jung P, Kwon G, Jin K, Kim JK, Hong K, Park YI, Kim TH, Heo J, Sim U. Defect engineered ternary metal spinel-type Ni-Fe-Co oxide as bifunctional electrocatalyst for overall electrochemical water splitting. J Colloid Interface Sci 2024; 663:566-576. [PMID: 38428114 DOI: 10.1016/j.jcis.2024.02.042] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 01/31/2024] [Accepted: 02/04/2024] [Indexed: 03/03/2024]
Abstract
Transition metal spinel oxides were engineered with active elements as bifunctional water splitting electrocatalysts to deliver superior intrinsic activity, stability, and improved conductivity to support green hydrogen production. In this study, we reported the ternary metal Ni-Fe-Co spinel oxide electrocatalysts prepared by defect engineering strategy with rich and deficient Na+ ions, termed NFCO-Na and NFCO, which suggest the formation of defects with Na+ forming tensile strain. The Na-rich NiFeCoO4 spinel oxide reveals lattice expansion, resulting in the formation of a defective crystal structure, suggesting higher electrocatalytic active sites. The spherical NFCO-Na electrocatalysts exhibit lower OER and HER overpotentials of 248 mV and 153 mV at 10 mA cm-2 and smaller Tafel slope values of about 78 mV dec-1 and 129 mV dec-1, respectively. Notably, the bifunctional NFCO-Na electrocatalyst requires a minimum cell voltage of about 1.67 V to drive a current density of 10 mA cm-2. The present work highlights the significant electrochemical activity of defect-engineered ternary metal oxides, which can be further upgraded as highly active electrocatalysts for water splitting applications.
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Affiliation(s)
- Sebastian Cyril Jesudass
- Department of Materials Science & Engineering, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Subramani Surendran
- Hydrogen Energy Technology Laboratory, Korea Institute of Energy Technology (KENTECH), 58330 Jeollanamdo, Republic of Korea
| | - Dae Jun Moon
- Hydrogen Energy Technology Laboratory, Korea Institute of Energy Technology (KENTECH), 58330 Jeollanamdo, Republic of Korea; Research Institute, NEEL Sciences, INC., Gwangju 61186, Republic of Korea
| | - Sathyanarayanan Shanmugapriya
- Hydrogen Energy Technology Laboratory, Korea Institute of Energy Technology (KENTECH), 58330 Jeollanamdo, Republic of Korea
| | - Joon Young Kim
- Hydrogen Energy Technology Laboratory, Korea Institute of Energy Technology (KENTECH), 58330 Jeollanamdo, Republic of Korea; Research Institute, NEEL Sciences, INC., Gwangju 61186, Republic of Korea
| | - Gnanaprakasam Janani
- Hydrogen Energy Technology Laboratory, Korea Institute of Energy Technology (KENTECH), 58330 Jeollanamdo, Republic of Korea
| | - Krishnan Veeramani
- Department of Materials Science & Engineering, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Shivraj Mahadik
- Department of Materials Science & Engineering, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Il Goo Kim
- Research Institute, NEEL Sciences, INC., Gwangju 61186, Republic of Korea
| | - Pildo Jung
- Research Institute, NEEL Sciences, INC., Gwangju 61186, Republic of Korea
| | - Gibum Kwon
- Department of Mechanical Engineering, University of Kansas Lawrence, KS 66045, United States
| | - Kyoungsuk Jin
- Department of Chemistry, Korea University, Seoul 02841, Republic of Korea
| | - Jung Kyu Kim
- School of Chemical Engineering, Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon 16419, Republic of Korea
| | - Kootak Hong
- Department of Materials Science & Engineering, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Yong Il Park
- School of Chemical Engineering, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Tae-Hoon Kim
- Department of Materials Science & Engineering, Chonnam National University, Gwangju 61186, Republic of Korea.
| | - Jaeyeong Heo
- Department of Materials Science & Engineering, Chonnam National University, Gwangju 61186, Republic of Korea.
| | - Uk Sim
- Hydrogen Energy Technology Laboratory, Korea Institute of Energy Technology (KENTECH), 58330 Jeollanamdo, Republic of Korea; Research Institute, NEEL Sciences, INC., Gwangju 61186, Republic of Korea; Center for Energy Storage System, Chonnam National University, Gwangju 61186, Republic of Korea.
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Hwang SK, Park SJ, Park JH, Yoon JH, Yu Cho J, Cho DK, Heo J, Kim GY, Kim JY. Cs-treatments in Kesterite Thin-Film Solar Cells for Efficient Perovskite Tandems. Small 2024; 20:e2307175. [PMID: 38032159 DOI: 10.1002/smll.202307175] [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: 08/20/2023] [Revised: 10/28/2023] [Indexed: 12/01/2023]
Abstract
Cu2ZnSn(S,Se)4 (CZTSSe) thin film solar cells are an attractive choice for a bottom cell of the low-cost and environmental tandem solar cells with perovskite. However, the progress in developing efficient perovskite/CZTSSe tandem solar cells has been hindered by the lack of high performance of the CZTSSe bottom cell. Here, an efficient CZTSSe bottom cell is demonstrated by adopting a facile and effective CsF treatment process. It is found that the CsF treatment not only facilitates grain growth and improves phase homogeneity by suppressing the detrimental deep-level defects and secondary phases, but also induces larger band bending and stronger drift force at the P-N junction. As a result, the carrier extraction/transport can be effectively accelerated, while reducing the interfacial recombination. These combined effects eventually result in a significant performance enhancement from 8.38% to 10.20%. The CsF-treated CZTSSe solar cell is finally applied to the mechanically-stacked perovskite/CZTSSe 4-terminal tandem cell by coupling a semi-transparent perovskite top cell, which exhibits the highest reported tandem efficiency of 23.01%.
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Affiliation(s)
- Sun Kyung Hwang
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - So Jeong Park
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Jae Hyun Park
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
- Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, 08826, Republic of Korea
| | - Joo Ho Yoon
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Jae Yu Cho
- Department of Materials Science and Engineering, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Deok Ki Cho
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Jaeyeong Heo
- Department of Materials Science and Engineering, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Gee Yeong Kim
- Advanced Photovoltaics Research Center, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea
| | - Jin Young Kim
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
- Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, 08826, Republic of Korea
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Mahadik S, Surendran S, Moon DJ, Kim JY, Janani G, Jesudass SC, Veeramani K, Choi H, Shanmugapriya S, Kim IG, Jung P, Park YI, Heo J, Kim TH, Hong K, Sim U. Structurally engineered highly efficient electrocatalytic performance of 3-dimensional Mo/Ni chalcogenides for boosting overall water splitting performance. Chemosphere 2024; 352:141233. [PMID: 38266882 DOI: 10.1016/j.chemosphere.2024.141233] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 01/09/2024] [Accepted: 01/14/2024] [Indexed: 01/26/2024]
Abstract
Hydrogen production from water splitting combined with renewable electricity can provide a viable solution to the energy crisis. A novel MoS2/NiS2/Ni3S4 heterostructure is designed as a bifunctional electrocatalyst by facile hydrothermal method to demonstrate excellent electrocatalytic performance towards overall water splitting applications. MoS2/NiS2/Ni3S4 heterostructure necessitates a low overpotential of 81 mV and 210 mV to attain a current density of 10 mA cm-2 during the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. Consequently, the MoS2/NiS2/Ni3S4 heterostructure-based electrolyzer shows a low cell voltage of 1.54 V at 10 mA cm-2. The present work highlights the significance of the heterostructure configuration of transition metal sulfide-based electrocatalysts for electrochemical overall water splitting applications.
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Affiliation(s)
- Shivraj Mahadik
- Department of Materials Science & Engineering, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Subramani Surendran
- Hydrogen Energy Technology Laboratory, Korea Institute of Energy Technology (KENTECH), Naju, 58330, Jeollanamdo, Republic of Korea
| | - Dae Jun Moon
- Hydrogen Energy Technology Laboratory, Korea Institute of Energy Technology (KENTECH), Naju, 58330, Jeollanamdo, Republic of Korea; Research Institute, NEEL Sciences, INC., Naju, Republic of Korea
| | - Joon Young Kim
- Hydrogen Energy Technology Laboratory, Korea Institute of Energy Technology (KENTECH), Naju, 58330, Jeollanamdo, Republic of Korea; Research Institute, NEEL Sciences, INC., Naju, Republic of Korea
| | - Gnanaprakasam Janani
- Hydrogen Energy Technology Laboratory, Korea Institute of Energy Technology (KENTECH), Naju, 58330, Jeollanamdo, Republic of Korea
| | - Sebastian Cyril Jesudass
- Department of Materials Science & Engineering, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Krishnan Veeramani
- Department of Materials Science & Engineering, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Hyeonuk Choi
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Sathyanarayanan Shanmugapriya
- Hydrogen Energy Technology Laboratory, Korea Institute of Energy Technology (KENTECH), Naju, 58330, Jeollanamdo, Republic of Korea
| | - Il Goo Kim
- Research Institute, NEEL Sciences, INC., Naju, Republic of Korea
| | - Pildo Jung
- Research Institute, NEEL Sciences, INC., Naju, Republic of Korea
| | - Yong Il Park
- School of Chemical Engineering, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Jaeyeong Heo
- Department of Materials Science & Engineering, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Tae-Hoon Kim
- Department of Materials Science & Engineering, Chonnam National University, Gwangju, 61186, Republic of Korea.
| | - Kootak Hong
- Department of Materials Science & Engineering, Chonnam National University, Gwangju, 61186, Republic of Korea.
| | - Uk Sim
- Hydrogen Energy Technology Laboratory, Korea Institute of Energy Technology (KENTECH), Naju, 58330, Jeollanamdo, Republic of Korea; Research Institute, NEEL Sciences, INC., Naju, Republic of Korea; Center for Energy Storage System, Chonnam National University, Gwangju, 61186, Republic of Korea.
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Yoon H, Kim S, Park I, Heo J, Kim HS, Seo T. 2 DOF transformable wheel design based on geared 8 bar parallel linkage mechanism. Sci Rep 2024; 14:379. [PMID: 38172582 PMCID: PMC10764349 DOI: 10.1038/s41598-023-50804-y] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Accepted: 12/26/2023] [Indexed: 01/05/2024] Open
Abstract
This paper introduces a novel design and static optimization for a two-degrees-of-freedom transformable wheel based on a geared linkage mechanism. Overcoming obstacles, including stairs, with small wheels is a major challenge in the field of mobile robotics research. Among various robots, the transformable wheel, which can change the shape of the wheel to overcome steps and optimize the path, was presented and has undergone many improvements. Nevertheless, problems such as asymmetry and structural strength remain. Therefore, the design of this paper aims to address the structural inefficiencies identified in the previous research model, which were attributed to the asymmetric placement of the linear motion guide. Through the implementation of this mechanism, the linear motion of the lobe can be segregated, enabling each input motor to share the workload effectively. The optimization process focus on determining the optimal linkage length under static conditions, resulting in improved structural characteristics and force distribution of linkage within the designated workspace. As a result, asymmetry of motion is eliminated, required intervention angle of the driving motor and stress of linkage was reduced by 36.24% and 8.35%, respectively.
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Affiliation(s)
- Hyeungyu Yoon
- School of Mechanical Engineering, Hanyang University, Seoul, 04763, Republic of Korea
| | - SangGyun Kim
- School of Mechanical Engineering, Hanyang University, Seoul, 04763, Republic of Korea
| | - Inha Park
- School of Mechanical Engineering, Hanyang University, Seoul, 04763, Republic of Korea
| | - Jaeyeong Heo
- School of Mechanical Engineering, Hanyang University, Seoul, 04763, Republic of Korea
| | - Hwa Soo Kim
- Department of Mechanical Systems Engineering, Kyonggi University, Suwon, 16227, Republic of Korea.
| | - TaeWon Seo
- School of Mechanical Engineering, Hanyang University, Seoul, 04763, Republic of Korea.
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Kim J, Jang JS, Shin SW, Park H, Jeong WL, Mun SH, Min JH, Ma J, Heo J, Lee DS, Woo JJ, Kim JH, Kim HJ. Novel Mg- and Ga-doped ZnO/Li-Doped Graphene Oxide Transparent Electrode/Electron-Transporting Layer Combinations for High-Performance Thin-Film Solar Cells. Small 2023; 19:e2207966. [PMID: 36861366 DOI: 10.1002/smll.202207966] [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: 12/20/2022] [Revised: 01/09/2023] [Indexed: 06/02/2023]
Abstract
Herein, a novel combination of Mg- and Ga-co-doped ZnO (MGZO)/Li-doped graphene oxide (LGO) transparent electrode (TE)/electron-transporting layer (ETL) has been applied for the first time in Cu2 ZnSn(S,Se)4 (CZTSSe) thin-film solar cells (TFSCs). MGZO has a wide optical spectrum with high transmittance compared to that with conventional Al-doped ZnO (AZO), enabling additional photon harvesting, and has a low electrical resistance that increases electron collection rate. These excellent optoelectronic properties significantly improved the short-circuit current density and fill factor of the TFSCs. Additionally, the solution-processable alternative LGO ETL prevented plasma-induced damage to chemical bath deposited cadmium sulfide (CdS) buffer, thereby enabling the maintenance of high-quality junctions using a thin CdS buffer layer (≈30 nm). Interfacial engineering with LGO improved the Voc of the CZTSSe TFSCs from 466 to 502 mV. Furthermore, the tunable work function obtained through Li doping generated a more favorable band offset in CdS/LGO/MGZO interfaces, thereby, improving the electron collection. The MGZO/LGO TE/ETL combination achieved a power conversion efficiency of 10.67%, which is considerably higher than that of conventional AZO/intrinsic ZnO (8.33%).
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Affiliation(s)
- Jihun Kim
- Gwangju Clean Energy Research Center, Korea Institute of Energy Research (KIER), 270-25 Samso-ro, Gwangju, 61003, South Korea
| | - Jun Sung Jang
- Optoelectronic Convergence Research Center, Department of Materials Science and Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 61186, South Korea
| | - Seung Wook Shin
- Future Agricultural Research Division, Water Resource and Environment Research Group, Rural Research Institute, Korea Rural Community Corporation, Ansan-Si, 15634, South Korea
| | - Hyeonghun Park
- Graduate School of Energy Convergence, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju, 61005, South Korea
| | - Woo-Lim Jeong
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju, 61005, South Korea
| | - Seung-Hyun Mun
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju, 61005, South Korea
| | - Jung-Hong Min
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju, 61005, South Korea
| | - Jiyoung Ma
- Gwangju Clean Energy Research Center, Korea Institute of Energy Research (KIER), 270-25 Samso-ro, Gwangju, 61003, South Korea
| | - Jaeyeong Heo
- Optoelectronic Convergence Research Center, Department of Materials Science and Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 61186, South Korea
| | - Dong Seon Lee
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju, 61005, South Korea
| | - Jung-Je Woo
- Gwangju Clean Energy Research Center, Korea Institute of Energy Research (KIER), 270-25 Samso-ro, Gwangju, 61003, South Korea
| | - Jin Hyeok Kim
- Optoelectronic Convergence Research Center, Department of Materials Science and Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 61186, South Korea
| | - Hyeong-Jin Kim
- Graduate School of Energy Convergence, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju, 61005, South Korea
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Heo J, Medani K, Juma H. Paget-Schroetter syndrome from manual handling at work: Case report and review of the literature. Am J Ind Med 2022; 65:281-285. [PMID: 35195925 DOI: 10.1002/ajim.23337] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 02/06/2022] [Accepted: 02/07/2022] [Indexed: 11/11/2022]
Abstract
Paget-Schroetter syndrome (PSS) is a primary deep venous thrombosis of the subclavian-axillary vein complex occurring after repetitive and strenuous use of the shoulders and arms. Here, we report the case of a 24-year-old man who presented with left subclavian and axillary vein thrombosis after loading and unloading labor, who was diagnosed with PSS confirmed with Doppler ultrasound, and treated with anticoagulation. By comparing our case with 45 published case reports, we also aim to analyze patient characteristics, diagnostic methods, and treatment options for the disorder.
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Affiliation(s)
- Jaeyeong Heo
- Division of Environmental and Occupational Health Sciences University of Illinois at Chicago School of Public Health Chicago Illinois USA
| | - Khalid Medani
- Department of Occupational Medicine Concentra Urgent Care Inc. Moreno Valley California USA
| | - Haitham Juma
- Department of Occupational Medicine Loma Linda University Medical Center Loma Linda California USA
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Patil PR, Patil SS, Dongale TD, Mane RM, Patil SS, Mali SS, Hong CK, Bhosale PN, Heo J, Khot KV. Hydrothermally synthesized nanocrystalline photoactive SnS 2 thin films: effect of surface directing agents. NEW J CHEM 2022. [DOI: 10.1039/d1nj04361g] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the present work, we have synthesized tin disulphide (SnS2) thin films via a facile, low cost, single-step hydrothermal route using various surface directing agents.
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Affiliation(s)
- Parag R. Patil
- School of Nanoscience & Technology, Shivaji University, Kolhapur, Maharashtra, India
| | - Satish S. Patil
- Materials Research Laboratory, Department of Chemistry, Shivaji University, Kolhapur, Maharashtra, India
| | - Tukaram D. Dongale
- School of Nanoscience & Technology, Shivaji University, Kolhapur, Maharashtra, India
| | - Rahul M. Mane
- Materials Research Laboratory, Department of Chemistry, Shivaji University, Kolhapur, Maharashtra, India
| | - Sharad S. Patil
- Department of Physics, Shivaji University, Kolhapur, Maharashtra, India
| | - Sawanta S. Mali
- School of Applied Chemical Engineering, Chonnam National University, Gwangju, South Korea
| | - Chang K. Hong
- School of Applied Chemical Engineering, Chonnam National University, Gwangju, South Korea
| | - Popatrao N. Bhosale
- Materials Research Laboratory, Department of Chemistry, Shivaji University, Kolhapur, Maharashtra, India
| | - Jaeyeong Heo
- Department of Materials Science & Engineering, Chonnam National University, Gwangju, South Korea
| | - Kishorkumar V. Khot
- School of Nanoscience & Technology, Shivaji University, Kolhapur, Maharashtra, India
- Materials Research Laboratory, Department of Chemistry, Shivaji University, Kolhapur, Maharashtra, India
- Department of Agrochemical & Pest Management, Shivaji University, Kolhapur, Maharashtra, India
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Bae Y, Heo J, Chung Y, Shin SY, Lee SW. Effect of total cholesterol level variabilities on cerebrovascular disease. Eur Rev Med Pharmacol Sci 2022; 26:544-557. [PMID: 35113431 DOI: 10.26355/eurrev_202201_27882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
OBJECTIVE Hyperlipidemia is a risk factor of cerebrovascular disease (CVD). However, the relationship between CVD and cholesterol variability is less clear. This study assesses the relationship between cholesterol change and CVD risk. PATIENTS AND METHODS We reviewed 480,830 people from 20 to 99 years with 2 health check-ups from 2002 to 2015 from the Korean National Health Insurance (KNHI) database. People's baseline and follow-up cholesterol levels were classified into low (<180 mg/dL), moderate (≥180 mg/dL and <240 mg/dL), and high (≥240 mg/dL). Participants were divided into 9 groups (low-to-low, low-to-moderate, low-to-high, moderate-to-low, moderate-to-moderate, moderate-to-high, high-to-low, high-to-moderate, high-to-high). RESULTS Low to high cholesterol level is associated with hemorrhagic stroke (aHR1 = 1.59; 95% CI 1.12-2.28 and aHR2 = 1.56; 95% CI 1.07-2.25). Low to moderate/high cholesterol level is associated with ischemic stroke and occlusion/stenosis (for low to moderate, aHR1 = 1.11; 95% CI 1.04-1.17 and aHR2 = 1.14; 95% CI 1.07-1.21 for ischemic stroke and aHR1 = 1.18; 95% CI 1.07-1.29 and aHR2 = 1.20; 95% CI 1.08-1.32 for occlusion/stenosis, for low to high, aHR1 = 1.42; 95% CI 1.20-1.67 and aHR2 = 1.28; 95% CI 1.08-1.52 for ischemic stroke and aHR1 = 1.86; 95% CI 1.46-2.36 and aHR2= 1.74; 95% CI 1.36-2.23 for occlusion/stenosis). Moderate to high cholesterol level is associated with ischemic stroke and occlusion/stenosis (for ischemic stroke, aHR1 = 1.12; 95% CI 1.05-1.20 and aHR2 = 1.10; 95% CI 1.03-1.17, for occlusion/stenosis, aHR1 = 1.21; 95% CI 1.10-1.33 and aHR2 = 1.19; 95% CI 1.08-1.32). Moderate to low cholesterol level is associated with ischemic and hemorrhagic stroke and occlusion/stenosis (for ischemic, aHR1 = 1.15; 95% CI 1.09-1.21, for hemorrhagic, aHR1 = 1.14; 95% CI 1.01-1.28, for occlusion/stenosis, aHR1 = 1.14; 95% CI 1.05-1.23). High to low cholesterol level is associated with ischemic stroke and occlusion/stenosis (for ischemic stroke, aHR1 = 1.51; 95% CI 1.33-1.71 and aHR2 = 1.20; 95% CI 1.05-1.36, for occlusion/stenosis, aHR1 = 1.50; 95% CI 1.24-1.81). CONCLUSIONS Our study shows that cholesterol changes, especially larger changes, lead to an increase in CVD, which demonstrates that cholesterol variability may increase CVD.
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Affiliation(s)
- Y Bae
- Department of Neurosurgery, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
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9
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Heo J, Kim Y, Lee J, Lee S, Shin S, Lee Y, Kim S, Choi J, Kim S. 756P Efficacy of circulating tumor DNA (ctDNA) analysis in the early detection of ovarian cancer progression. Ann Oncol 2021. [DOI: 10.1016/j.annonc.2021.08.1198] [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: 10/20/2022] Open
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Tolea MI, Heo J, Chrisphonte S, Galvin JE. A Modified CAIDE Risk Score as a Screening Tool for Cognitive Impairment in Older Adults. J Alzheimers Dis 2021; 82:1755-1768. [PMID: 34219721 DOI: 10.3233/jad-210269] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
BACKGROUND Although an efficacious dementia-risk score system, Cardiovascular Risk Factors, Aging, and Dementia (CAIDE) was derived using midlife risk factors in a population with low educational attainment that does not reflect today's US population, and requires laboratory biomarkers, which are not always available. OBJECTIVE Develop and validate a modified CAIDE (mCAIDE) system and test its ability to predict presence, severity, and etiology of cognitive impairment in older adults. METHODS Population consisted of 449 participants in dementia research (N = 230; community sample; 67.9±10.0 years old, 29.6%male, 13.7±4.1 years education) or receiving dementia clinical services (N = 219; clinical sample; 74.3±9.8 years old, 50.2%male, 15.5±2.6 years education). The mCAIDE, which includes self-reported and performance-based rather than blood-derived measures, was developed in the community sample and tested in the independent clinical sample. Validity against Framingham, Hachinski, and CAIDE risk scores was assessed. RESULTS Higher mCAIDE quartiles were associated with lower performance on global and domain-specific cognitive tests. Each one-point increase in mCAIDE increased the odds of mild cognitive impairment (MCI) by up to 65%, those of AD by 69%, and those for non-AD dementia by > 85%, with highest scores in cases with vascular etiologies. Being in the highest mCAIDE risk group improved ability to discriminate dementia from MCI and controls and MCI from controls, with a cut-off of ≥7 points offering the highest sensitivity, specificity, and positive and negative predictive values. CONCLUSION mCAIDE is a robust indicator of cognitive impairment in community-dwelling seniors, which can discriminate well between dementia severity including MCI versus controls. The mCAIDE may be a valuable tool for case ascertainment in research studies, helping flag primary care patients for cognitive testing, and identify those in need of lifestyle interventions for symptomatic control.
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Affiliation(s)
- Magdalena I Tolea
- Comprehensive Center for Brain Health, Department of Neurology, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Jaeyeong Heo
- Department of Neurology, Harbor UCLA Medical Center, Los Angeles, LA, USA
| | - Stephanie Chrisphonte
- Comprehensive Center for Brain Health, Department of Neurology, University of Miami Miller School of Medicine, Miami, FL, USA
| | - James E Galvin
- Comprehensive Center for Brain Health, Department of Neurology, University of Miami Miller School of Medicine, Miami, FL, USA
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Jo Y, Kim YT, Cho H, Ji MK, Heo J, Lim HP. Atomic Layer Deposition of ZrO 2 on Titanium Inhibits Bacterial Adhesion and Enhances Osteoblast Viability. Int J Nanomedicine 2021; 16:1509-1523. [PMID: 33658781 PMCID: PMC7917324 DOI: 10.2147/ijn.s298449] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [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: 12/24/2020] [Accepted: 02/10/2021] [Indexed: 12/26/2022] Open
Abstract
Purpose The study was intended to create a uniform zirconia layer even on the surface of complex structures via atomic layer deposition (ALD). The impact of crystalline zirconia deposited by ALD on bacterial adhesion and osteoblast viability was assessed via surface treatment of dental implants. Methods Amorphous zirconia was deposited using an atomic layer deposition reactor (Atomic Classic, CN1, Hwaseong, Korea) on titanium discs. Heating the samples at 400°C resulted in crystallization. Samples were divided into three groups: the control group, the group carrying amorphous ALD-zirconia (Z group), and the heat-treated group following zirconia ALD deposition (ZH group).The surface of each sample was analyzed, followed by the assessment of adhesion of Streptococcus mutans and Porphyromonas gingivalis, and viability and differentiation of MC3T3-E1 cells. Results The adhesion of S. mutans and P. gingivalis was significantly reduced in the Z and ZH groups compared with the control group (P < 0.05). The viability of MC3T3-E1 cells was significantly increased in the ZH group compared with the control group (P < 0.001), while no significant differences were observed in the Z group (P > 0.05). Differentiation of MC3T3-E1 cells showed a marginally significant increase in the ZH group compared with the control group (P < 0.1), while no significant differences were found in the Z group (P > 0.1). Conclusion Compared with the pure titanium group, the groups that were coated with zirconia via ALD showed a decreased adhesion of S. mutans during the early stages of biofilm formation and P. gingivalis adhesion inducing peri-implantitis, and an increase in MC3T3-E1 cell viability and differentiation. The findings indicate the possibility of treating the implant surface to reduce peri-implantitis and improve osseointegration.
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Affiliation(s)
- Yujin Jo
- Department of Prosthodontics, School of Dentistry, Chonnam National University, Gwangju, Korea
| | - Yong Tae Kim
- Department of Materials Science and Engineering, Chonnam National University, Gwangju, 61186, Korea
| | - Hoonsung Cho
- Department of Materials Science and Engineering, Chonnam National University, Gwangju, 61186, Korea
| | - Min-Kyung Ji
- Optoelectronics Convergence Research Center, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Jaeyeong Heo
- Department of Materials Science and Engineering, Chonnam National University, Gwangju, 61186, Korea.,Optoelectronics Convergence Research Center, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Hyun-Pil Lim
- Department of Prosthodontics, School of Dentistry, Chonnam National University, Gwangju, Korea
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12
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Lanfredini M, Bestion D, D'Auria F, Aksan N, Fillion P, Gaillard P, Heo J, Karppinen I, Kim K, Kurki J, Liu L, Shen A, Vacher JL, Wang D. Critical flow prediction by system codes – Recent analyses made within the FONESYS network. Nuclear Engineering and Design 2020. [DOI: 10.1016/j.nucengdes.2020.110731] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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13
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Hossain M, Park DS, Rahman MS, Ki SJ, Lee YR, Imran KM, Yoon D, Heo J, Lee TJ, Kim YS. Bifidobacterium longum DS0956 and Lactobacillus rhamnosus DS0508 culture-supernatant ameliorate obesity by inducing thermogenesis in obese-mice. Benef Microbes 2020; 11:361-373. [PMID: 32755263 DOI: 10.3920/bm2019.0179] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Excessive body fat and the related dysmetabolic diseases affect both developed and developing countries. The aim of this study was to investigate the beneficial role of a bacterial culture supernatant (hereafter: BS) of Lactobacillus and Bifidobacterium and their potential mechanisms of action on white-fat browning and lipolysis. For selection of four candidates among 55 Lactic acid producing bacteria (LAB) from human infant faeces, we evaluated by Oil Red O staining and Ucp1 mRNA quantitation in 3T3-L1 preadipocytes. The expression of browning and lipolysis markers was examined along with in vitro assays. The possible mechanism was revealed by molecular and biological experiments including inhibitor and small interfering RNA (siRNA) assays. In a mouse model, physiological, histological, and biochemical parameters and expression of some thermogenesis-related genes were compared among six experimental groups fed a high-fat diet and one normal-diet control group. The results allow us to speculate that BS treatment promotes browning and lipolysis both in vitro and in vivo. Moreover, the BS may activate thermogenic programs via a mechanism involving PKA-CREB signaling in 3T3-L1 cells. According to our data, we can propose that two LAB strains, Bifidobacterium longum DS0956 and Lactobacillus rhamnosus DS0508, may be good candidates for a dietary supplement against obesity and metabolic diseases; however, further research is required for the development as dietary supplements or drugs.
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Affiliation(s)
- M Hossain
- Institute of Tissue Regeneration, College of Medicine, Soonchunhyang University, Cheonan Chung-nam 31151, Republic of Korea.,Department of Microbiology, College of Medicine, Soonchunhyang University, Soonchunhyang 6 gil 31, Dongnam-Gu, Cheonan Chung-nam 31151, Republic of Korea
| | - D-S Park
- Biological Resource Center, Korea Research Institute of Bioscience and Biotechnology, 181 Ipsin-gil, Jeongeup-si, Jeollabuk-do 580-185, Republic of Korea
| | - M S Rahman
- Institute of Tissue Regeneration, College of Medicine, Soonchunhyang University, Cheonan Chung-nam 31151, Republic of Korea.,Department of Microbiology, College of Medicine, Soonchunhyang University, Soonchunhyang 6 gil 31, Dongnam-Gu, Cheonan Chung-nam 31151, Republic of Korea
| | - S-J Ki
- Biological Resource Center, Korea Research Institute of Bioscience and Biotechnology, 181 Ipsin-gil, Jeongeup-si, Jeollabuk-do 580-185, Republic of Korea
| | - Y R Lee
- Biological Resource Center, Korea Research Institute of Bioscience and Biotechnology, 181 Ipsin-gil, Jeongeup-si, Jeollabuk-do 580-185, Republic of Korea
| | - K M Imran
- Institute of Tissue Regeneration, College of Medicine, Soonchunhyang University, Cheonan Chung-nam 31151, Republic of Korea.,Department of Microbiology, College of Medicine, Soonchunhyang University, Soonchunhyang 6 gil 31, Dongnam-Gu, Cheonan Chung-nam 31151, Republic of Korea
| | - D Yoon
- Institute of Tissue Regeneration, College of Medicine, Soonchunhyang University, Cheonan Chung-nam 31151, Republic of Korea.,Department of Microbiology, College of Medicine, Soonchunhyang University, Soonchunhyang 6 gil 31, Dongnam-Gu, Cheonan Chung-nam 31151, Republic of Korea
| | - J Heo
- International Agricultural Development and Cooperation Center, Chonbuk National University, Jeonju 54896, Republic of Korea
| | - T-J Lee
- Department of Anatomy, College of Medicine, Yeungnam University, Daegu 42415, Republic of Korea
| | - Y-S Kim
- Institute of Tissue Regeneration, College of Medicine, Soonchunhyang University, Cheonan Chung-nam 31151, Republic of Korea.,Department of Microbiology, College of Medicine, Soonchunhyang University, Soonchunhyang 6 gil 31, Dongnam-Gu, Cheonan Chung-nam 31151, Republic of Korea
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14
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Choi S, Park J, Shin H, Heo J, Kim W. How Do Caregivers of Children with Congenital Heart Disease Navigate the Health Care System in Ethiopia? Health Serv Res 2020; 55:65-65. [PMCID: PMC7440601 DOI: 10.1111/1475-6773.13418] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/27/2023] Open
Abstract
Research Objective Global surgery is becoming an increasingly important global health agenda. Cardiovascular disease is the major cause of mortality around the world, and congenital heart disease is the leading cause of morbidity in children. This study aimed to investigate and illustrate the caregivers’ experiences of accessing the health care system and undergoing pediatric cardiac surgery for children with congenital heart disease (CHD). Study Design A qualitative study was conducted. Interviews were conducted in December 2019 in Amharic, then translated into English using trained local interpreters. Data were transcribed verbatim and analyzed according to the principles of interpretive thematic analysis, informed by the candidacy framework, using NVivo. The candidacy framework explores the access to health care utilization by seven elements: candidacy, navigation, the permeability of services, appearances at health services, adjudications, offers and resistance, and operating conditions and the local production of candidacy. Population Studied Interviews were conducted with 13 caregivers of 10 patients with congenital heart disease that received cardiac surgery during the week of the interview. Principal Findings The following three themes emerged from the interviews: (a) Recognition of CHD mostly took place at birth, but for those born at home, they found out much later (max 14 years); (b) CHD was misdiagnosed multiple times prior to seeking care at a large hospital; and (c) patients were waiting for the surgery for more than a year, (d) being scheduled for surgery induced both anxiety and hopefulness. In the discussion, caregivers had financial difficulties and struggled in a fragmented delivery system and experienced poor service quality such as the inaccuracy of diagnosis while navigating the Ethiopian health care system. Conclusions Major care‐seeking delays were related to the inefficient and complex health care system, largely due to lack of early CHD recognition and financial hardships. Financial protection is low despite the availability of fee waivers for medications. Low education attainment and distance to hospitals are contributing to this challenge. Implications for Policy or Practice Overall, Ethiopia needs to prioritize policies that protect the financial status of low‐income households that need health care services. Along with increasing health care workforce capacity for pediatric cardiac surgeries in Ethiopia, there is a need to strengthen the district‐level screening capacity to facilitate earlier diagnosis at easily accessible health care settings. Primary Funding Source Search Results Web results Korea International Cooperation Agency.
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Affiliation(s)
- S. Choi
- Boston University School of Public HealthBostonMAUnited States
| | - J. Park
- Johns Hopkins Bloomberg School of Public HealthBaltimoreMDUnited States
| | - H. Shin
- JW LEE Center for Global MedicineSeoulKorea
| | - J. Heo
- Government institution (South Korea)SeoulKorea
| | - W.‐H. Kim
- JW LEE Center for Global MedicineSeoul National UniversitySeoulKorea
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15
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Kim Y, Song GY, Nandi R, Cho JY, Heo J, Cho DY. Phase identification of vanadium oxide thin films prepared by atomic layer deposition using X-ray absorption spectroscopy. RSC Adv 2020; 10:26588-26593. [PMID: 35519762 PMCID: PMC9055385 DOI: 10.1039/d0ra04384b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 05/16/2020] [Accepted: 07/10/2020] [Indexed: 11/21/2022] Open
Abstract
The chemical and local structures of vanadium oxide (VOx) thin films prepared by atomic layer deposition (ALD) were investigated by soft X-ray absorption spectroscopy. It is shown that the as-deposited film was a mixture of VO2 and V2O5 in disordered form, while the chemistry changed significantly after heat treatment, subject to the different gas environment. Forming gas (95% N2 + 5% H2) annealing resulted in a VO2 composition, consisting mostly of the VO2 (B) phase with small amount of the VO2 (M) phase, whereas O2 annealing resulted in the V2O5 phase. An X-ray circular magnetic dichroism study further revealed the absence of ferromagnetic ordering, confirming the absence of oxygen vacancies despite the reduction of V ions in VO2 (V4+) with respect to the precursor used in the ALD (V5+). This implies that the prevalence of VO2 in the ALD films cannot be attributed to a simple oxygen-deficiency-related reduction scheme but should be explained by the metastability of the local VO2 structures. X-ray absorption spectroscopy reveals the local structures of atomic-layer-deposited vanadium oxide films subject to heat treatments.![]()
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Affiliation(s)
- Yejin Kim
- IPIT, Department of Physics, Jeonbuk National University Jeonju 54896 Korea
| | - Gwang Yeom Song
- Department of Materials Science and Engineering, Optoelectronics Convergence Research Center, Chonnam National University Gwangju 61186 Republic of Korea
| | - Raju Nandi
- Department of Materials Science and Engineering, Optoelectronics Convergence Research Center, Chonnam National University Gwangju 61186 Republic of Korea
| | - Jae Yu Cho
- Department of Materials Science and Engineering, Optoelectronics Convergence Research Center, Chonnam National University Gwangju 61186 Republic of Korea
| | - Jaeyeong Heo
- Department of Materials Science and Engineering, Optoelectronics Convergence Research Center, Chonnam National University Gwangju 61186 Republic of Korea
| | - Deok-Yong Cho
- IPIT, Department of Physics, Jeonbuk National University Jeonju 54896 Korea
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16
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Ramasamy HV, N Didwal P, Sinha S, Aravindan V, Heo J, Park CJ, Lee YS. Atomic layer deposition of Al 2O 3 on P2-Na 0.5Mn 0.5Co 0.5O 2 as interfacial layer for high power sodium-ion batteries. J Colloid Interface Sci 2020; 564:467-477. [PMID: 31927394 DOI: 10.1016/j.jcis.2019.12.132] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [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: 08/30/2019] [Revised: 12/26/2019] [Accepted: 12/31/2019] [Indexed: 12/22/2022]
Abstract
Surface modification is one of the impressive and widely used technique to improve the electrochemical performance of sodium-ion batteries by modifying the electrode-electrolyte interface. Herein, we used the atomic layer deposition (ALD) to modify the surface of P2-Na0.5Mn0.5Co0.5O2 by sub-monolayer Al2O3 coating on the prefabricated electrodes. Phase purity is confirmed using various structural and morphological studies. The pristine electrode delivered an initial discharge capacity of 154 mAh g-1 at 0.5C, and inferior rate performance of 23 mAh g-1 at 40C rate. On the other hand, the interfacial modified cathode with 5 cycles of ALD coating delivers a high capacity of 174 and 45 mAh g-1 at 0.5C and 40C rate, respectively. The Co2+/3+ redox couple is utilized for the faradaic process with high reversibility along with suppressed P2-O2 phase transition. The presence of the Al2O3 layer acts as an artificial cathode electrolyte interface by suppressing the electrolyte oxidation at higher cutoff potentials. This is clearly validated by the reduced charge transfer resistance of surface modified electrodes after cycling at various current rates. Even at an elevated temperature condition (50 °C), interfacial layer significantly improves the safety of the cell and ensures the stability of the cathode.
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Affiliation(s)
- Hari Vignesh Ramasamy
- Department of Advanced Chemicals and Engineering, Chonnam National University, Gwang-ju 61186, Republic of Korea
| | - Pravin N Didwal
- Department of Materials Science and Engineering, Chonnam National University, Gwang-ju 61186, Republic of Korea
| | - Soumyadeep Sinha
- Department of Materials Science and Engineering, Chonnam National University, Gwang-ju 61186, Republic of Korea
| | - Vanchiappan Aravindan
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Tirupati 517507, India
| | - Jaeyeong Heo
- Department of Materials Science and Engineering, Chonnam National University, Gwang-ju 61186, Republic of Korea
| | - Chan-Jin Park
- Department of Materials Science and Engineering, Chonnam National University, Gwang-ju 61186, Republic of Korea
| | - Yun-Sung Lee
- Department of Advanced Chemicals and Engineering, Chonnam National University, Gwang-ju 61186, Republic of Korea.
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17
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Pawar PS, Cho JY, Neerugatti KE, Sinha S, Rana TR, Ahn S, Heo J. Solution-Processed Zn xCd 1-xS Buffer Layers for Vapor Transport-Deposited SnS Thin-Film Solar Cells: Achieving High Open-Circuit Voltage. ACS Appl Mater Interfaces 2020; 12:7001-7009. [PMID: 31746184 DOI: 10.1021/acsami.9b14329] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
As an alternative buffer material to CdS, ZnxCd1-xS buffer layers for vapor transport-deposited SnS thin-film solar cells (TFSCs) were fabricated using the successive ionic layer adsorption and reaction (SILAR) method. Varying the Zn-to-Cd ratio resulted in a series of ZnxCd1-xS thin films with controllable band gaps in the range of 2.40-3.65 eV. The influence of the Zn-to-Cd ratio on the cell performance was investigated in detail. The Zn0.34Cd0.66S buffer layer was found to be the optimal composition for SnS TFSCs, and a record open-circuit voltage (Voc) of 0.405 V was achieved with an efficiency of 3.72%, whereas the SILAR-CdS buffer layer rendered a Voc of 0.324 V. The improvement in Voc when using the Zn0.34Cd0.66S buffer layer was corroborated by the spike-type conduction band offset of 0.35 eV with the SnS absorber, as revealed by the X-ray photoelectron spectroscopy analysis. In addition, minimized interfacial recombination at the SnS/Zn0.34Cd0.66S heterojunction was confirmed by the temperature-dependent Voc analysis under illuminated conditions.
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Affiliation(s)
- Pravin S Pawar
- Department of Materials Science and Engineering, and Optoelectronics Convergence Research Center , Chonnam National University , Gwangju 61186 , Republic of Korea
| | - Jae Yu Cho
- Department of Materials Science and Engineering, and Optoelectronics Convergence Research Center , Chonnam National University , Gwangju 61186 , Republic of Korea
| | - KrishnaRao Eswar Neerugatti
- Department of Materials Science and Engineering, and Optoelectronics Convergence Research Center , Chonnam National University , Gwangju 61186 , Republic of Korea
| | - Soumyadeep Sinha
- Department of Materials Science and Engineering, and Optoelectronics Convergence Research Center , Chonnam National University , Gwangju 61186 , Republic of Korea
| | - Tanka Raj Rana
- Photovoltaics Laboratory , Korea Institute of Energy Research , 152 Gajeong-ro , Yuseong-gu, Daejeon 34129 , Republic of Korea
| | - SeJin Ahn
- Photovoltaics Laboratory , Korea Institute of Energy Research , 152 Gajeong-ro , Yuseong-gu, Daejeon 34129 , Republic of Korea
- Department of Renewable Energy Engineering , Korea University of Science and Technology (UST) , 217 Gajeong-ro , Yuseong-gu, Daejeon 34113 , Republic of Korea
| | - Jaeyeong Heo
- Department of Materials Science and Engineering, and Optoelectronics Convergence Research Center , Chonnam National University , Gwangju 61186 , Republic of Korea
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18
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Johnstone EV, Bailey DJ, Lawson S, Stennett MC, Corkhill CL, Kim M, Heo J, Matsumura D, Hyatt NC. Synthesis and characterization of iodovanadinite using PdI 2, an iodine source for the immobilisation of radioiodine. RSC Adv 2020; 10:25116-25124. [PMID: 35517431 PMCID: PMC9055183 DOI: 10.1039/d0ra04114a] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Accepted: 06/14/2020] [Indexed: 12/02/2022] Open
Abstract
The synthesis of a palladium-containing iodovanadinite derivative, hypothetically “PdPb9(VO4)6I2”, was attempted using PdI2 as a source of iodine in searching for a novel waste form for radioiodine. Stoichiometric amounts of Pb3(VO4)2 and PdI2 were batched and reacted at elevated temperatures in sealed vessels. Batched material was also subjected to high-energy ball-milling (HEBM) in order to reduce reaction time and the potential for iodine volatilization during subsequent reaction at 200–500 °C. The resulting products were characterized using X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray analysis, IR spectroscopy, thermal analysis and Pd K XANES. Results showed that PdI2 can function as a sacrificial iodine source for the formation of iodovanadinite, prototypically Pb10(VO4)6I2, however, the incorporation of Pd into this phase was not definitively observed. The sacrificial reaction mechanism involved the decomposition of PdI2 to Pd metal and nascent I2, with the latter incorporated into the iodovanadinite Pb10(VO4)6I2 phase. In comparison to processing using standard solid state reaction techniques, the use of HEBM prior to high temperature reaction generates a more homogeneous end-product with better iodine retention for this system. Overall, the key novelty and importance of this work is in demonstrating a method for direct immobilisation of undissolved PdI2 from nuclear fuel reprocessing, in a composite wasteform in which I-129 is immobilised within a durable iodovandinite ceramic, encapsulating Pd metal. The synthesis and characterisation of a composite wasteform, comprising iodovanadinite Pb10(VO4)6I2 and Pd metal, is reported, for immobilisation of radioiodine PdI2; the formation of Pd incorporated iodovanadinite “PdPb9(VO4)6I2” was not observed.![]()
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Affiliation(s)
- E. V. Johnstone
- University of Sheffield
- Materials Science and Engineering Department
- Sheffield
- UK
| | - D. J. Bailey
- University of Sheffield
- Materials Science and Engineering Department
- Sheffield
- UK
| | - S. Lawson
- University of Sheffield
- Materials Science and Engineering Department
- Sheffield
- UK
| | - M. C. Stennett
- University of Sheffield
- Materials Science and Engineering Department
- Sheffield
- UK
| | - C. L. Corkhill
- University of Sheffield
- Materials Science and Engineering Department
- Sheffield
- UK
| | - M. Kim
- University of Sheffield
- Materials Science and Engineering Department
- Sheffield
- UK
- Department of Materials Science and Engineering
| | - J. Heo
- Department of Materials Science and Engineering
- Pohang University of Science and Technology (POSTECH)
- Pohang
- South Korea
- Division of Advanced Nuclear Engineering
| | - D. Matsumura
- Materials Sciences Research Center
- Japan Atomic Energy Agency
- Sayo
- Japan
| | - N. C. Hyatt
- University of Sheffield
- Materials Science and Engineering Department
- Sheffield
- UK
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Arunachalam M, Yun G, Lee HS, Ahn KS, Heo J, Kang SH. Effects of Al2O3 Coating on BiVO4 and Mo-doped BiVO4 Film for Solar Water Oxidation. J ELECTROCHEM SCI TE 2019. [DOI: 10.33961/jecst.2019.00374] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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20
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Nandi DK, Yeo S, Ansari MZ, Sinha S, Cheon T, Kwon J, Kim H, Heo J, Song T, Kim SH. Thickness-dependent electrochemical response of plasma enhanced atomic layer deposited WS2 anodes in Na-ion battery. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.134766] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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Sinha S, Didwal PN, Nandi DK, Verma R, Cho JY, Kim SH, Park CJ, Heo J. Revealing the Simultaneous Effects of Conductivity and Amorphous Nature of Atomic-Layer-Deposited Double-Anion-Based Zinc Oxysulfide as Superior Anodes in Na-Ion Batteries. Small 2019; 15:e1900595. [PMID: 31373770 DOI: 10.1002/smll.201900595] [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] [Received: 01/31/2019] [Revised: 07/04/2019] [Indexed: 06/10/2023]
Abstract
Although sodium-ion batteries (SIBs) are considered promising alternatives to their Li counterparts, they still suffer from challenges like slow kinetics of the sodiation process, large volume change, and inferior cycling stability. On the other hand, the presence of additional reversible conversion reactions makes the metal compounds the preferred anode materials over carbon. However, conductivity and crystallinity of such materials often play the pivotal role in this regard. To address these issues, atomic layer deposited double-anion-based ternary zinc oxysulfide (ZnOS) thin films as an anode material in SIBs are reported. Electrochemical studies are carried out with different O/(O+S) ratios, including O-rich and S-rich crystalline ZnOS along with the amorphous phase. Amorphous ZnOS with the O/(O+S) ratio of ≈0.4 delivers the most stable and considerably high specific (and volumetric) capacities of 271.9 (≈1315.6 mAh cm-3 ) and 173.1 mAh g-1 (≈837.7 mAh cm-3 ) at the current densities of 500 and 1000 mA g-1 , respectively. A dominant capacitive-controlled contribution of the amorphous ZnOS anode indicates faster electrochemical reaction kinetics. An electrochemical reaction mechanism is also proposed via X-ray photoelectron spectroscopy analyses. A comparison of the cycling stability further establishes the advantage of this double-anion-based material over pristine ZnO and ZnS anodes.
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Affiliation(s)
- Soumyadeep Sinha
- Department of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Pravin N Didwal
- Department of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Dip K Nandi
- School of Materials Science and Engineering, Yeungnam University, 214-1, Dae-dong, Gyeongsan-si, 38541, Republic of Korea
| | - Rakesh Verma
- Department of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Jae Yu Cho
- Department of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Soo-Hyun Kim
- School of Materials Science and Engineering, Yeungnam University, 214-1, Dae-dong, Gyeongsan-si, 38541, Republic of Korea
| | - Chan-Jin Park
- Department of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Jaeyeong Heo
- Department of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, Gwangju, 61186, Republic of Korea
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22
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Bogere P, Choi Y, Heo J. Probiotics as alternatives to antibiotics in treating post-weaning diarrhoea in pigs: Review paper. S AFR J ANIM SCI 2019. [DOI: 10.4314/sajas.v49i3.1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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23
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Moehler M, Heo J, Lee HC, Tak WY, Chao Y, Paik SW, Yim HJ, Byun KS, Baron A, Ungerechts G, Jonker D, Ruo L, Cho M, Kaubisch A, Wege H, Merle P, Ebert O, Habersetzer F, Blanc JF, Rosmorduc O, Lencioni R, Patt R, Leen AM, Foerster F, Homerin M, Stojkowitz N, Lusky M, Limacher JM, Hennequi M, Gaspar N, McFadden B, De Silva N, Shen D, Pelusio A, Kirn DH, Breitbach CJ, Burke JM. Vaccinia-based oncolytic immunotherapy Pexastimogene Devacirepvec in patients with advanced hepatocellular carcinoma after sorafenib failure: a randomized multicenter Phase IIb trial (TRAVERSE). Oncoimmunology 2019; 8:1615817. [PMID: 31413923 PMCID: PMC6682346 DOI: 10.1080/2162402x.2019.1615817] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [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: 11/27/2018] [Revised: 04/15/2019] [Accepted: 04/19/2019] [Indexed: 02/07/2023] Open
Abstract
Pexastimogene devacirepvec (Pexa-Vec) is a vaccinia virus-based oncolytic immunotherapy designed to preferentially replicate in and destroy tumor cells while stimulating anti-tumor immunity by expressing GM-CSF. An earlier randomized Phase IIa trial in predominantly sorafenib-naïve hepatocellular carcinoma (HCC) demonstrated an overall survival (OS) benefit. This randomized, open-label Phase IIb trial investigated whether Pexa-Vec plus Best Supportive Care (BSC) improved OS over BSC alone in HCC patients who failed sorafenib therapy (TRAVERSE). 129 patients were randomly assigned 2:1 to Pexa-Vec plus BSC vs. BSC alone. Pexa-Vec was given as a single intravenous (IV) infusion followed by up to 5 IT injections. The primary endpoint was OS. Secondary endpoints included overall response rate (RR), time to progression (TTP) and safety. A high drop-out rate in the control arm (63%) confounded assessment of response-based endpoints. Median OS (ITT) for Pexa-Vec plus BSC vs. BSC alone was 4.2 and 4.4 months, respectively (HR, 1.19, 95% CI: 0.78–1.80; p = .428). There was no difference between the two treatment arms in RR or TTP. Pexa-Vec was generally well-tolerated. The most frequent Grade 3 included pyrexia (8%) and hypotension (8%). Induction of immune responses to vaccinia antigens and HCC associated antigens were observed. Despite a tolerable safety profile and induction of T cell responses, Pexa-Vec did not improve OS as second-line therapy after sorafenib failure. The true potential of oncolytic viruses may lie in the treatment of patients with earlier disease stages which should be addressed in future studies. ClinicalTrials.gov: NCT01387555
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Affiliation(s)
- M Moehler
- First Department of Medicine, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
| | - J Heo
- College of Medicine, Pusan National University and Medical Research Institute, Pusan National University Hospital, Busan, Republic of Korea
| | - H C Lee
- Asan Medical Center, University of Ulsan College of Medicine, Ulsan, Republic ofKorea
| | - W Y Tak
- School of Medicine, Kyungpook National University Medical Center, Daegu, Republic of Korea
| | - Y Chao
- Department of Oncology, Taipei Veterans General Hospital, Taipei, Taiwan
| | - S W Paik
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - H J Yim
- Department of Internal Medicine, Korea University Ansan Hospital, Ansan-si, Republic of Korea
| | - K S Byun
- Department of Internal Medicine, Korea UniversityCollege of Medicine, Seoul, Republic of Korea
| | - A Baron
- Department of Medicine, California Pacific Medical Center, San Francisco, CA, USA
| | - G Ungerechts
- Department of Medical Oncology, National Center for Tumor Diseases (NCT) and Heidelberg University Hospital, Heidelberg, Germany
| | - D Jonker
- The Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Canada
| | - L Ruo
- Department of Surgery, Juravinski Hospital and Cancer Centre, McMaster University, Hamilton, Canada
| | - M Cho
- Department of Internal Medicine, Pusan National University Yangsan Hospital, Busan, Republic of Korea
| | - A Kaubisch
- Department of Medicine, Montefiore Medical Center, New York, NY, USA
| | - H Wege
- Department of Medicine, Gastroenterology and Hepatology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - P Merle
- Hepatology Unit, Croix-Rousse Hospital, Lyon, France
| | - O Ebert
- Klinik und Poliklinik für Innere Medizin II, Klinikum rechts der Isar, Technical University, Munich, Germany
| | - F Habersetzer
- Pôle Hépato-Digestif, Hôpitaux Universitaires de Strasbourg, INSERM 1110, IHU de Strasbourg and Université de Strasbourg, Strasbourg, France
| | - J F Blanc
- Hepato-Gastroenterology and Digestive Oncology Department, CHU Bordeaux, Bordeaux, France
| | | | - R Lencioni
- Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL, USA
| | - R Patt
- Rad-MD, New York, NY, USA
| | - A M Leen
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - F Foerster
- First Department of Medicine, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
| | - M Homerin
- Medical Affairs, Transgene S.A., Illkirch-Graffenstaden, France
| | - N Stojkowitz
- Clinical Operations, Transgene S.A., 400 Bd Gonthier d'Andernach, Parc d'Innovation, 67405 Illkirch-Graffenstaden, France
| | - M Lusky
- Program Management, Transgene S.A., 400 Bd Gonthier d'Andernach, Parc d'Innovation, 67405 Illkirch-Graffenstaden, France
| | - J M Limacher
- Medical Affairs, Transgene S.A., 400 Bd Gonthier d'Andernach, Parc d'Innovation, 67405 Illkirch-Graffenstaden, France
| | - M Hennequi
- Biostatistics, Transgene S.A., 400 Bd Gonthier d'Andernach, Parc d'Innovation, 67405 Illkirch-Graffenstaden, France
| | - N Gaspar
- Clinical Assays, SillaJen Inc., San Francisco, CA, USA
| | - B McFadden
- Analytical Development and Quality Control, SillaJen Inc., San Francisco, CA, USA
| | - N De Silva
- Clinical, SillaJen Inc., San Francisco, CA, USA
| | - D Shen
- Clinical, SillaJen Inc., San Francisco, CA, USA
| | - A Pelusio
- Clinical, SillaJen Inc., San Francisco, CA, USA
| | - D H Kirn
- SillaJen Inc., San Francisco, CA, USA
| | | | - J M Burke
- Clinical, SillaJen Inc., San Francisco, CA, USA
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Abstract
Salvage therapy for recurrent high grade gliomas (HGG) includes surgery, radiotherapy and chemotherapy, however, standard treatment does not exist. We evaluated the tolerability and efficacy of re-irradiation (re-RT) with hyperthermia (HT) for patients with recurrent HGG. From September 2010 to July 2015, 20 patients with recurrent HGG were treated with re-RT and HT. The radiotherapy dose of 30 Gray (Gy) was delivered with 2 Gy per fraction daily, and HT was performed twice weekly. Primary endpoints were treatment compliance and toxicity. Second endpoints were overall survival (OS) and progression free survival (PFS). The median interval between initial RT and re-RT was 11 months. During re-RT with HT, there were no significant acute morbidities over grade 3. Median overall survival (OS) from re-irradiation was 8.4 months and the 6 and 12 months survival rate were 67% and 30%, respectively. The median progression free survival (PFS) from re-irradiation was 4.1 month. Our findings suggested that concurrent re-RT with HT was a safe and well-tolerated. In addition, the combination re-RT and HT could be a valuable salvage treatment option for selected recurrent HGG patients with poor performance status.
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Heo J, Oh Y, Noh O, Chun M, Cho O. PO-0711 Second Primary Cancer in Salivary gland cancer in South Korea: A Nationwide Population-based Study. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)31131-4] [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: 11/26/2022]
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Cho O, Oh Y, Chun M, Noh O, Heo J. PV-0042 Radiation related lymphopenia as a predictor of locoregional recurrence in early breast cancer. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)30462-1] [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: 10/26/2022]
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Wilkins L, Hawrylack A, Heo J, Gielata M, Kubicka E, Brautigan D. 04:03 PM Abstract No. 390 Pharmacokinetic verification of loco-regional delivery of caffeic acid using drug-eluting beads in a large animal model. J Vasc Interv Radiol 2019. [DOI: 10.1016/j.jvir.2018.12.465] [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: 11/17/2022] Open
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Heo J, Oh Y, Noh O, Chun M, Kim C, Shin Y. PO-139 Second Primary Cancer in Salivary gland cancer: A Nationwide Population-based Study. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)30305-6] [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: 11/29/2022]
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Lee M, Park H, Heo J, Choi H, Seo S. 181 Multi-tissue transcriptomic analysis of the effects of supplementation of L- or D-methionine in acute heat stress-exposed broiler chickens. J Anim Sci 2018. [DOI: 10.1093/jas/sky404.659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- M Lee
- Chungnam National University,Daejon, South Korea
| | - H Park
- Chungnam National University,Daejon, South Korea
| | - J Heo
- Chungnam National University,Daejon, South Korea
| | - H Choi
- CJ Cheiljedang,Seoul, South Korea
| | - S Seo
- Chungnam National University,Daejon, South Korea
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Wickramasuriya S, Kim E, Macelline S, Shin T, Cho H, Heo J. PSXVI-35 Egg production performance and egg quality of laying hens fed a diet supplemented with deoxynivalenol mycotoxins contaminated corn distillers dried grains with soluble. J Anim Sci 2018. [DOI: 10.1093/jas/sky404.736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
| | - E Kim
- Chungnam National University,Daejeon, South Korea
| | - S Macelline
- Chungnam National University,Daejeon, South Korea
| | - T Shin
- Chungnam National University,Daejeon, South Korea
| | - H Cho
- Chungnam National University,Daejeon, South Korea
| | - J Heo
- Chungnam National University,Daejeon, South Korea
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Lee S, Choi E, Heo J, Kim S, Lee S, Jo S, Won Y. GROUP VOLUNTEERING AS SERIOUS LEISURE AND SUCCESSFUL AGING. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
| | - E Choi
- Colorado State University
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Heo J, Cheng AL, Raoul JL, Peck-Radosavljevic M, Kudo M, Nakajima K, Bayh I, Lin SM, Lee H. Practice patterns, radiologic tumor response, and deterioration of liver function after transarterial chemoembolization (TACE): Final analysis of OPTIMIS in Korea and other regions. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy432.003] [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: 11/13/2022] Open
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Han SS, Heo J, Lee SJ. Risk of lung cancer following pulmonary tuberculosis: A nationwide population-based cohort study, South Korea. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy292.115] [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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Lee H, Jung J, Heo J. P1.15-14 Pneumonia in Patients with Lung Cancer of South Korea: A Nationwide Population Based Study. J Thorac Oncol 2018. [DOI: 10.1016/j.jtho.2018.08.946] [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: 10/28/2022]
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Lee O, Kim K, Kim J, Kim YD, Pak H, Hong G, Chim CY, Uhm J, Cho I, Joung B, Yu C, Lee H, Kang W, Heo J, Jang Y. P3830Favorable neurological outcomes of left atrial appendage occlusion versus non-vitamin K antagonist oral anticoagulants after stroke in atrial fibrillation. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy563.p3830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- O Lee
- Severance Hospital, Cardiology, Yongin, Korea Republic of
| | - K Kim
- Severance Hospital, Cardiology, Seoul, Korea Republic of
| | - J Kim
- Severance Hospital, Cardiology, Seoul, Korea Republic of
| | - Y D Kim
- Severance Hospital, Neurology, Seoul, Korea Republic of
| | - H Pak
- Severance Hospital, Cardiology, Seoul, Korea Republic of
| | - G Hong
- Severance Hospital, Cardiology, Seoul, Korea Republic of
| | - C Y Chim
- Severance Hospital, Cardiology, Seoul, Korea Republic of
| | - J Uhm
- Severance Hospital, Cardiology, Seoul, Korea Republic of
| | - I Cho
- Severance Hospital, Cardiology, Seoul, Korea Republic of
| | - B Joung
- Severance Hospital, Cardiology, Seoul, Korea Republic of
| | - C Yu
- Korea University Anam Hospital, Cardiology, Seoul, Korea Republic of
| | - H Lee
- Sejong General Hospital, Cardiology, Seoul, Korea Republic of
| | - W Kang
- Gil Hospital, Cardiology, Incheon, Korea Republic of
| | - J Heo
- Severance Hospital, Neurology, Seoul, Korea Republic of
| | - Y Jang
- Severance Hospital, Cardiology, Seoul, Korea Republic of
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Nandi DK, Sahoo S, Kim TH, Cheon T, Sinha S, Rahul R, Jang Y, Bae JS, Heo J, Shim JJ, Kim SH. Low temperature atomic layer deposited molybdenum nitride-Ni-foam composite: An electrode for efficient charge storage. Electrochem commun 2018. [DOI: 10.1016/j.elecom.2018.07.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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37
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Heo J, Oh Y, Noh O, Chun M, Cho O. EP-1109: Psychiatric comorbidity among nasopharynx cancer survivors who received radiotherapy in South Korea. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)31419-1] [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: 10/14/2022]
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Unithrattil S, Arunkumar P, Kim YH, Kim HJ, Vu NH, Heo J, Chung WJ, Im WB. A Phosphosilicate Compound, NaCa 3PSiO 8: Structure Solution and Luminescence Properties. Inorg Chem 2017; 56:15130-15137. [PMID: 29192776 DOI: 10.1021/acs.inorgchem.7b02456] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
NaCa3PSiO8 was synthesized in a microwave-assisted solid-state reaction. The crystal structure of the synthesized compound was solved using a least-squares method, followed by simulated annealing. The compound was crystallized in the orthorhombic space group Pna21, belonging to Laue class mmm. The structure consisted of two layers of cation planes, each of which contained three cation channels. The cation channels in each of the layers ran antiparallel to that of the adjacent layer. All the major cations together constituted four distinct crystallographic sites. The Rietveld refinement of the powder X-ray diffraction data, followed by the maximum-entropy method analysis, confirmed the obtained structure solutions. The electronic band structure of the compound was analyzed through density function theory calculations. Luminescence properties of the compound, upon activating with Eu2+ ions, were analyzed through photoluminescence measurements and decay profile analysis. The compound was found to exhibit green luminescence centered at ∼502 nm, with a typical broadband emission due to the transition from the crystal-field split 4f65d to 4f7 levels.
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Affiliation(s)
- Sanjith Unithrattil
- School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University , 300 Yongbong-dong, Buk-gu, Gwangju 500-757, Republic of Korea
| | - Paulraj Arunkumar
- School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University , 300 Yongbong-dong, Buk-gu, Gwangju 500-757, Republic of Korea
| | - Yoon Hwa Kim
- School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University , 300 Yongbong-dong, Buk-gu, Gwangju 500-757, Republic of Korea
| | - Ha Jun Kim
- School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University , 300 Yongbong-dong, Buk-gu, Gwangju 500-757, Republic of Korea
| | - Ngoc Hung Vu
- School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University , 300 Yongbong-dong, Buk-gu, Gwangju 500-757, Republic of Korea
| | - Jaeyeong Heo
- School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University , 300 Yongbong-dong, Buk-gu, Gwangju 500-757, Republic of Korea
| | - Woon Jin Chung
- Institute for Rare Metals & Division of Advanced Materials Engineering, Kongju National University , Cheonan, Chungnam 330-717, South Korea
| | - Won Bin Im
- School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University , 300 Yongbong-dong, Buk-gu, Gwangju 500-757, Republic of Korea
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Nandi DK, Sahoo S, Sinha S, Yeo S, Kim H, Bulakhe RN, Heo J, Shim JJ, Kim SH. Highly Uniform Atomic Layer-Deposited MoS 2@3D-Ni-Foam: A Novel Approach To Prepare an Electrode for Supercapacitors. ACS Appl Mater Interfaces 2017; 9:40252-40264. [PMID: 29099166 DOI: 10.1021/acsami.7b12248] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This article takes an effort to establish the potential of atomic layer deposition (ALD) technique toward the field of supercapacitors by preparing molybdenum disulfide (MoS2) as its electrode. While molybdenum hexacarbonyl [Mo(CO)6] serves as a novel precursor toward the low-temperature synthesis of ALD-grown MoS2, H2S plasma helps to deposit its polycrystalline phase at 200 °C. Several ex situ characterizations such as X-ray diffractometry (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and so forth are performed in detail to study the as-grown MoS2 film on a Si/SiO2 substrate. While stoichiometric MoS2 with very negligible amount of C and O impurities was evident from XPS, the XRD and high-resolution transmission electron microscopy analyses confirmed the (002)-oriented polycrystalline h-MoS2 phase of the as-grown film. A comparative study of ALD-grown MoS2 as a supercapacitor electrode on 2-dimensional stainless steel and on 3-dimensional (3D) Ni-foam substrates clearly reflects the advantage and the potential of ALD for growing a uniform and conformal electrode material on a 3D-scaffold layer. Cyclic voltammetry measurements showed both double-layer capacitance and capacitance contributed by the faradic reaction at the MoS2 electrode surface. The optimum number of ALD cycles was also found out for achieving maximum capacitance for such a MoS2@3D-Ni-foam electrode. A record high areal capacitance of 3400 mF/cm2 was achieved for MoS2@3D-Ni-foam grown by 400 ALD cycles at a current density of 3 mA/cm2. Moreover, the ALD-grown MoS2@3D-Ni-foam composite also retains high areal capacitance, even up to a high current density of 50 mA/cm2. Finally, this directly grown MoS2 electrode on 3D-Ni-foam by ALD shows high cyclic stability (>80%) over 4500 charge-discharge cycles which must invoke the research community to further explore the potential of ALD for such applications.
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Affiliation(s)
| | | | - Soumyadeep Sinha
- Department of Materials Science and Engineering, and Optoelectronics Convergence Research Center, Chonnam National University , Gwangju 61186, Republic of Korea
| | - Seungmin Yeo
- School of Electrical and Electronic Engineering, Yonsei University , Seodaemun-gu, Seoul 120-749, Republic of Korea
| | - Hyungjun Kim
- School of Electrical and Electronic Engineering, Yonsei University , Seodaemun-gu, Seoul 120-749, Republic of Korea
| | | | - Jaeyeong Heo
- Department of Materials Science and Engineering, and Optoelectronics Convergence Research Center, Chonnam National University , Gwangju 61186, Republic of Korea
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Cho O, Oh Y, Chun M, Noh O, Heo J. P1.15-015 Prognostic Implication of the FEV1/FVC Ratio in Limited-Stage Small Cell Lung Cancer. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.1051] [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: 11/29/2022]
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Hong CW, Shin SW, Suryawanshi MP, Gang MG, Heo J, Kim JH. Chemically Deposited CdS Buffer/Kesterite Cu 2ZnSnS 4 Solar Cells: Relationship between CdS Thickness and Device Performance. ACS Appl Mater Interfaces 2017; 9:36733-36744. [PMID: 28980468 DOI: 10.1021/acsami.7b09266] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Earth-abundant, copper-zinc-tin-sulfide (CZTS), kesterite, is an attractive absorber material for thin-film solar cells (TFSCs). However, the open-circuit voltage deficit (Voc-deficit) resulting from a high recombination rate at the buffer/absorber interface is one of the major challenges that must be overcome to improve the performance of kesterite-based TFSCs. In this paper, we demonstrate the relationship between device parameters and performances for chemically deposited CdS buffer/CZTS-based heterojunction TFSCs as a function of buffer layer thickness, which could change the CdS/CZTS interface conditions such as conduction band or valence band offsets, to gain deeper insight and understanding about the Voc-deficit behavior from a high recombination rate at the CdS buffer/kesterite interface. Experimental results show that device parameters and performances are strongly dependent on the CdS buffer thickness. We postulate two meaningful consequences: (i) Device parameters were improved up to a CdS buffer thickness of 70 nm, whereas they deteriorated at a thicker CdS buffer layer. The Voc-deficit in the solar cells improved up to a CdS buffer thickness of 92 nm and then deteriorated at a thicker CdS buffer layer. (ii) The minimum values of the device parameters were obtained at 70 nm CdS thickness in the CZTS TFSCs. Finally, the highest conversion efficiency of 8.77% (Voc: 494 mV, Jsc: 34.54 mA/cm2, and FF: 51%) is obtained by applying a 70 nm thick CdS buffer to the Cu2ZnSn(S,Se)4 absorber layer.
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Affiliation(s)
- Chang Woo Hong
- Department of Materials Science and Engineering and Optoelectronic Convergence Research Center, Chonnam National University , Gwangju 61186, Republic of Korea
| | - Seung Wook Shin
- Department of Physics and Astronomy and Wright Center for Photovoltaic Innovation and Commercialization, University of Toledo , Toledo, Ohio 43606, United States
| | - Mahesh P Suryawanshi
- Department of Materials Science and Engineering and Optoelectronic Convergence Research Center, Chonnam National University , Gwangju 61186, Republic of Korea
| | - Myeng Gil Gang
- Department of Materials Science and Engineering and Optoelectronic Convergence Research Center, Chonnam National University , Gwangju 61186, Republic of Korea
| | - Jaeyeong Heo
- Department of Materials Science and Engineering and Optoelectronic Convergence Research Center, Chonnam National University , Gwangju 61186, Republic of Korea
| | - Jin Hyeok Kim
- Department of Materials Science and Engineering and Optoelectronic Convergence Research Center, Chonnam National University , Gwangju 61186, Republic of Korea
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Song H, Kim Y, Park J, Park M, Lyu S, Koh Y, Heo J, Lee D, Park K. Biocompatible nanoparticle PLGA is a noble safe delivery system for embryo development and next generations. Fertil Steril 2017. [DOI: 10.1016/j.fertnstert.2017.07.465] [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: 10/18/2022]
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Choi Y, Lyu S, Park H, Park M, Lee S, Cho M, Ko J, Koh Y, Heo J, Park H, Kim J, Lee W. Differences in endometrial microbial composition correlate with implantation failure after IVF embryo transfer. Fertil Steril 2017. [DOI: 10.1016/j.fertnstert.2017.07.1087] [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: 10/18/2022]
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Choe S, Kim S, Jun Y, Lee W, Kang I, Koong M, Heo J, Sim C, Koh Y, Park D, Yoon T. Ambient air pollution is associated with success of in-vitro fertilization cycles: a retrospective study in Seoul, Korea. Fertil Steril 2017. [DOI: 10.1016/j.fertnstert.2017.07.959] [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: 11/27/2022]
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Yu E, Sim C, Park D, Koh Y, Heo J, Choe S, Kim J, Koong M, Kang I, Yoon T, Kim Y. Relationship between heavy metal concentration and number of spontaneous abortion experiences in Korean women: a retrospective study of the 6th Korean national health and nutrition examination survey. Fertil Steril 2017. [DOI: 10.1016/j.fertnstert.2017.07.947] [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: 10/18/2022]
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Han E, Koh Y, Heo J, Kim M, Lee H, Park H, Kim J, Lee W. Efficacy of granulocyte colony stimulation factor(G-CSF) administration to improve IVF outcomes: a meta-analysis. Fertil Steril 2017. [DOI: 10.1016/j.fertnstert.2017.07.1037] [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: 10/18/2022]
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Choe S, Kim Y, Kang I, Sim C, Heo J, Koh Y, Koong M, Yoon T, Park D, Lee Y, Kim J, Kim M. Risk factors for premature or early menopause: a comparative study between United States and South Korean women. Fertil Steril 2017. [DOI: 10.1016/j.fertnstert.2017.07.369] [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: 10/18/2022]
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Song GY, Oh C, Sinha S, Son J, Heo J. Facile Phase Control of Multivalent Vanadium Oxide Thin Films (V 2O 5 and VO 2) by Atomic Layer Deposition and Postdeposition Annealing. ACS Appl Mater Interfaces 2017; 9:23909-23917. [PMID: 28569063 DOI: 10.1021/acsami.7b03398] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Atomic layer deposition was adopted to deposit VOx thin films using vanadyl tri-isopropoxide {VO[O(C3H7)]3, VTIP} and water (H2O) at 135 °C. The self-limiting and purge-time-dependent growth behaviors were studied by ex situ ellipsometry to determine the saturated growth conditions for atomic-layer-deposited VOx. The as-deposited films were found to be amorphous. The structural, chemical, and optical properties of the crystalline thin films with controlled phase formation were investigated after postdeposition annealing at various atmospheres and temperatures. Reducing and oxidizing atmospheres enabled the formation of pure VO2 and V2O5 phases, respectively. The possible band structures of the crystalline VO2 and V2O5 thin films were established. Furthermore, an electrochemical response and a voltage-induced insulator-to-metal transition in the vertical metal-vanadium oxide-metal device structure were observed for V2O5 and VO2 films, respectively.
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Affiliation(s)
- Gwang Yeom Song
- Department of Materials Science and Engineering, and Optoelectronics Convergence Research Center, Chonnam National University , Gwangju 61186, Republic of Korea
| | - Chadol Oh
- Department of Materials Science and Engineering, Pohang University of Science and Technology , Pohang 37673, Republic of Korea
| | - Soumyadeep Sinha
- Department of Materials Science and Engineering, and Optoelectronics Convergence Research Center, Chonnam National University , Gwangju 61186, Republic of Korea
| | - Junwoo Son
- Department of Materials Science and Engineering, Pohang University of Science and Technology , Pohang 37673, Republic of Korea
| | - Jaeyeong Heo
- Department of Materials Science and Engineering, and Optoelectronics Convergence Research Center, Chonnam National University , Gwangju 61186, Republic of Korea
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Affiliation(s)
- J. Ryu
- Texas A&M University, College Station, Texas,
| | - H. Yang
- Texas A&M University, College Station, Texas,
| | - A.C. Kim
- University of Florida, Gainesville, Florida
| | - K. Kim
- University of Miami, Miami, Florida,
| | - J. Heo
- Texas A&M University, College Station, Texas,
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Affiliation(s)
- J. Heo
- Charles E. Schmidt College of Medicine at Florida Atlantic University, Boca Raton, Florida
| | - M. Tolea
- Charles E. Schmidt College of Medicine at Florida Atlantic University, Boca Raton, Florida
| | - J.E. Galvin
- Charles E. Schmidt College of Medicine at Florida Atlantic University, Boca Raton, Florida
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