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Shin JC, Jeong JH, Kwon J, Kim YH, Kim B, Woo SJ, Woo KY, Cho M, Watanabe K, Taniguchi T, Kim YD, Cho YH, Lee TW, Hone J, Lee CH, Lee GH. Electrically Confined Electroluminescence of Neutral Excitons in WSe 2 Light-Emitting Transistors. Adv Mater 2024; 36:e2310498. [PMID: 38169481 DOI: 10.1002/adma.202310498] [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: 10/10/2023] [Revised: 12/29/2023] [Indexed: 01/05/2024]
Abstract
Monolayer transition metal dichalcogenides (TMDs) have drawn significant attention for their potential in optoelectronic applications due to their direct band gap and exceptional quantum yield. However, TMD-based light-emitting devices have shown low external quantum efficiencies as imbalanced free carrier injection often leads to the formation of non-radiative charged excitons, limiting practical applications. Here, electrically confined electroluminescence (EL) of neutral excitons in tungsten diselenide (WSe2) light-emitting transistors (LETs) based on the van der Waals heterostructure is demonstrated. The WSe2 channel is locally doped to simultaneously inject electrons and holes to the 1D region by a local graphene gate. At balanced concentrations of injected electrons and holes, the WSe2 LETs exhibit strong EL with a high external quantum efficiency (EQE) of ≈8.2 % at room temperature. These experimental and theoretical results consistently show that the enhanced EQE could be attributed to dominant exciton emission confined at the 1D region while expelling charged excitons from the active area by precise control of external electric fields. This work shows a promising approach to enhancing the EQE of 2D light-emitting transistors and modulating the recombination of exciton complexes for excitonic devices.
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Affiliation(s)
- June-Chul Shin
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Jae Hwan Jeong
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Junyoung Kwon
- Department of Material Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - Yeon Ho Kim
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 02841, Republic of Korea
| | - Bumho Kim
- Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Seung-Je Woo
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Kie Young Woo
- Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Minhyun Cho
- Department of Physics and Department of Information Display, Kyung Hee University, Seoul, 02447, Republic of Korea
| | - Kenji Watanabe
- Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan
| | - Takashi Taniguchi
- Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan
| | - Young Duck Kim
- Department of Physics and Department of Information Display, Kyung Hee University, Seoul, 02447, Republic of Korea
| | - Yong-Hoon Cho
- Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Tae-Woo Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - James Hone
- Department of Mechanical Engineering, Columbia University, New York, NY, 10027, USA
| | - Chul-Ho Lee
- Department of Electrical and Computer Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Gwan-Hyoung Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
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Shin H, Baek Y, Lee D, Xu Y, Kwon Y, Jo I, Ha NC. Structural and Functional Analyses of the Flavoprotein Disulfide Reductase FN0820 of Fusobacterium nucleatum. J Microbiol 2023; 61:1033-1041. [PMID: 38117463 DOI: 10.1007/s12275-023-00095-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 11/07/2023] [Accepted: 11/07/2023] [Indexed: 12/21/2023]
Abstract
Escherichia coli RclA and Staphylococcus aureus MerA are part of the Group I flavoprotein disulfide reductase (FDR) family and have been implicated in the contribution to bacterial pathogenesis by defending against the host immune response. Fusobacterium nucleatum is a pathogenic, anaerobic Gram-negative bacterial species commonly found in the human oral cavity and gastrointestinal tract. In this study, we discovered that the F. nucleatum protein FN0820, belonging to the Group I FDR family, exhibited a higher activity of a Cu2+-dependent NADH oxidase than E. coli RclA. Moreover, FN0820 decreased the dissolved oxygen level in the solution with higher NADH oxidase activity. We found that L-tryptophan and its analog 5-hydroxytryptophan inhibit the FN0820 activities of NADH oxidase and the concomitant reduction of oxygen. Our results have implications for developing new treatment strategies against pathogens that defend the host immune response with Group I FDRs.
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Affiliation(s)
- Hyunwoo Shin
- Department of Agricultural Biotechnology and Research Institute of Agriculture and Life Sciences, CALS, Seoul National University, Seoul, 08826, Republic of Korea
| | - Yeongjin Baek
- Department of Agricultural Biotechnology and Research Institute of Agriculture and Life Sciences, CALS, Seoul National University, Seoul, 08826, Republic of Korea
| | - Dukwon Lee
- Department of Agricultural Biotechnology and Research Institute of Agriculture and Life Sciences, CALS, Seoul National University, Seoul, 08826, Republic of Korea
| | - Yongbin Xu
- Department of Bioengineering, College of Life Science, Dalian Minzu University, Dalian, 116600, People's Republic of China
| | - Yonghoon Kwon
- Department of Agricultural Biotechnology and Research Institute of Agriculture and Life Sciences, CALS, Seoul National University, Seoul, 08826, Republic of Korea
| | - Inseong Jo
- Infectious Diseases Therapeutic Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon, 34114, Republic of Korea.
| | - Nam-Chul Ha
- Department of Agricultural Biotechnology and Research Institute of Agriculture and Life Sciences, CALS, Seoul National University, Seoul, 08826, Republic of Korea.
- Center for Food and Bioconvergence, Seoul National University, Seoul, 08826, Republic of Korea.
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Kumar DSRS, Puthiran SH, Selvaraju GD, Matthew PA, Senthilkumar P, Kuppusamy S, Mani RR, Hatamleh AA, Ai-Dosary MA, Chang SW, Ravindran B. Preparation and Characterization of Magnetite-Polyvinyl Alcohol Hybrid Nanoparticles (As-PVA-MNPs) Using Acanthophora spicifera Marine Algae Extract for Enhanced Antimicrobial Activity Against Pathogenic Microorganisms. Mol Biotechnol 2023:10.1007/s12033-023-00903-y. [PMID: 37907811 DOI: 10.1007/s12033-023-00903-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: 06/08/2023] [Accepted: 08/28/2023] [Indexed: 11/02/2023]
Abstract
The present study focused on preparing and characterizing magnetite-polyvinyl alcohol (PVA) hybrid nanoparticles using Acanthophora spicifera marine algae extract as a reducing agent. Various analytical techniques, including UV-Visible spectrometry, Fourier-transform infrared (FTIR) analysis, energy-dispersive X-ray (EDX), scanning electron microscopy (SEM), and X-ray diffraction (XRD) analysis, were used to characterize the nanoparticles. The results showed the successful synthesis of nanoparticles with a characteristic color change and absorption peak at 400 nm in UV-Visible spectrometry. FTIR analysis indicated an interaction between the carboxyl group and magnetite-polyvinyl alcohol hybrid ions. SEM analysis revealed spherical nanoparticles with sizes ranging from 20 to 100 nm. EDX analysis confirmed the presence of strong magnetite peaks in Acanthophora spicifera, validating successful preparation. XRD analysis indicated the crystalline nature of the nanoparticles. Furthermore, the antimicrobial potential of As-PVA-MNPs was evaluated, demonstrating a significant zone of inhibition against tested bacterial and fungal samples at a concentration of 100 µg. These findings suggest the promising antimicrobial activity of the synthesized nanoparticles for potential applications in combating pathogenic microorganisms.
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Affiliation(s)
| | - S Hari Puthiran
- School of Biotechnology, Dr. G. R. Damodaran College of Science, Coimbatore, Tamil Nadu, 641014, India
| | - Gayathri Devi Selvaraju
- Department of Biotechnology, KIT-Kalaignarkarunanidhi Institute of Technology, Coimbatore, Tamil Nadu, 641402, India
| | - Paul A Matthew
- School of Bioscience and Technology, VIT- Vellore Institute of Technology, Vellore, Tamil Nadu, 632014, India
| | - P Senthilkumar
- School of Biotechnology, Dr. G. R. Damodaran College of Science, Coimbatore, Tamil Nadu, 641014, India
| | - Sowmya Kuppusamy
- PG and Research Department of Biotechnology & Bioinformatics, Holy Cross College, Tiruchirappalli, Tamil Nadu, 620002, India
| | - Ravishankar Ram Mani
- Faculty of Pharmaceutical Sciences, UCSI University, 56000, Cheras, Kuala Lumpur, Malaysia
| | - Ashraf Atef Hatamleh
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, 1155, Riyadh, Saudi Arabia
| | - Munirah Abdullah Ai-Dosary
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, 1155, Riyadh, Saudi Arabia
| | - Soon Woong Chang
- Department of Medical Biotechnology and Integrative Physiology, Institute of Biotechnology, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Thandalam, Chennai, Tamil Nadu, 602105, India
| | - Balasubramani Ravindran
- Department of Medical Biotechnology and Integrative Physiology, Institute of Biotechnology, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Thandalam, Chennai, Tamil Nadu, 602105, India.
- Department of Environmental Energy and Engineering, Kyonggi University, Yeongtong-Gu, Suwon, Gyeonggi-Do, 16227, Republic of Korea.
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