1
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Ağırcan H, Convertino D, Rossi A, Martini L, Pace S, Mishra N, Küster K, Starke U, Kartal Şireli G, Coletti C, Forti S. Determination and investigation of defect domains in multi-shape monolayer tungsten disulfide. NANOSCALE ADVANCES 2024; 6:2850-2859. [PMID: 38817435 PMCID: PMC11134227 DOI: 10.1039/d4na00125g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Accepted: 04/15/2024] [Indexed: 06/01/2024]
Abstract
Single-layer tungsten disulfide (WS2) is among the most widely investigated two-dimensional materials. Synthesizing it over large areas would enable the exploitation of its appealing optical and electronic properties in industrial applications. However, defects of different nature, concentration and distribution profoundly affect the optical as well as the electronic properties of this crystal. Controlling the defect density distribution can be an effective way to tailor the local dielectric environment and therefore the electronic properties of the system. In this work we investigate the defects in single-layer WS2, grown in different shapes by liquid phase chemical vapor deposition, where the concentration of certain defect species can be controlled by the growth conditions. The properties of the material are surveyed by means of optical spectroscopy, photoelectron spectroscopy and Kelvin probe force microscopy. We determine the chemical nature of the defects and study their influence on the optical and electronic properties of WS2. This work contributes to the understanding of the microscopic nature of the intrinsic defects in WS2, helping the development of defect-based technologies which rely on the control and engineering of defects in dielectric 2D crystals.
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Affiliation(s)
- H Ağırcan
- Center for Nanotechnology Innovation @NEST, Istituto Italiano di Tecnologia Piazza San Silvestro 12 I-56127 Pisa Italy
- Department of Metallurgical & Materials Engineering Istanbul Technical University 34469 Maslak Istanbul Turkey
| | - D Convertino
- Center for Nanotechnology Innovation @NEST, Istituto Italiano di Tecnologia Piazza San Silvestro 12 I-56127 Pisa Italy
| | - A Rossi
- Center for Nanotechnology Innovation @NEST, Istituto Italiano di Tecnologia Piazza San Silvestro 12 I-56127 Pisa Italy
- Graphene Labs, Istituto Italiano di Tecnologia Via Morego 30 16163 Genova Italy
| | - L Martini
- Center for Nanotechnology Innovation @NEST, Istituto Italiano di Tecnologia Piazza San Silvestro 12 I-56127 Pisa Italy
| | - S Pace
- Center for Nanotechnology Innovation @NEST, Istituto Italiano di Tecnologia Piazza San Silvestro 12 I-56127 Pisa Italy
- Graphene Labs, Istituto Italiano di Tecnologia Via Morego 30 16163 Genova Italy
| | - N Mishra
- Center for Nanotechnology Innovation @NEST, Istituto Italiano di Tecnologia Piazza San Silvestro 12 I-56127 Pisa Italy
- Graphene Labs, Istituto Italiano di Tecnologia Via Morego 30 16163 Genova Italy
| | - K Küster
- Max-Planck-Institut für Festkörperforschung Heisenbergstr. 1 70569 Stuttgart Germany
| | - U Starke
- Max-Planck-Institut für Festkörperforschung Heisenbergstr. 1 70569 Stuttgart Germany
| | - G Kartal Şireli
- Department of Metallurgical & Materials Engineering Istanbul Technical University 34469 Maslak Istanbul Turkey
| | - C Coletti
- Center for Nanotechnology Innovation @NEST, Istituto Italiano di Tecnologia Piazza San Silvestro 12 I-56127 Pisa Italy
- Graphene Labs, Istituto Italiano di Tecnologia Via Morego 30 16163 Genova Italy
| | - S Forti
- Center for Nanotechnology Innovation @NEST, Istituto Italiano di Tecnologia Piazza San Silvestro 12 I-56127 Pisa Italy
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2
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Yoo J, Kim D, Jeong MS, Lee SM, Kim J. Divergent Vibrational Property Induced by an Anomalous Layer Sequence in Two-Dimensional GaPS 4. J Phys Chem Lett 2024; 15:5183-5190. [PMID: 38716924 PMCID: PMC11104350 DOI: 10.1021/acs.jpclett.4c00321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 03/21/2024] [Accepted: 03/22/2024] [Indexed: 05/22/2024]
Abstract
Recently, various fundamental properties of GaPS4 such as anisotropy and strain-induced properties have been reported, but the impacts of the stacking sequence in layered materials remain ambiguous. This ambiguity is evident in the inconsistent Raman scattering data reported for GaPS4, suggesting a significant influence of stacking order on its physical properties. To demonstrate the discrepancies, this study investigates the vibrational characteristics of 2D GaPS4 under different stacking sequences using both experimental observations and theoretical models (AA and AB sequences) through density functional theory calculations. The results of our theoretical calculations revealed that the identical stacking sequence structure significantly influences the vibrational configurations of GaPS4, which results in divergent configurations of Raman scattering spectra including unidentified Raman peaks. Our study addresses not only the clarification of the ambiguity of experimental observations but also qualitative criteria to evaluate the degree of each stacking sequence.
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Affiliation(s)
- Jaekak Yoo
- Korea
Research Institute of Standards and Science, Daejeon 34113, Republic of Korea
- Department
of Physics, Hanyang Unversity, Seoul 04763, Republic of Korea
| | - Doyeon Kim
- Korea
Research Institute of Standards and Science, Daejeon 34113, Republic of Korea
| | - Mun Seok Jeong
- Department
of Physics, Hanyang Unversity, Seoul 04763, Republic of Korea
| | - Seung Mi Lee
- Korea
Research Institute of Standards and Science, Daejeon 34113, Republic of Korea
| | - Jaeseok Kim
- Korea
Research Institute of Standards and Science, Daejeon 34113, Republic of Korea
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3
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Li H, Tan J, Yang S, Sun Y, Yu H. p-Toluenesulfonic Acid Modified Two-Dimensional ZrSe 2 as a Hole Transport Layer for High-Performance Organic Solar Cells. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38624163 DOI: 10.1021/acsami.4c00928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/17/2024]
Abstract
Two-dimensional (2D) materials have attracted attention due to their excellent optoelectronic properties, but their applications are limited by their defects and vacancies. Surface modification is an effective method to restore their performance. Here, ZrSe2 is modified with conductive polymer p-toluenesulfonic acid (PTSA). It is found that PTSA can obtain electrons of ZrSe2 through the combination of -SO3H and ZrSe2, thus forming interfacial dipoles, which improve the work function of ZrSe2. In addition, -OH in PTSA can effectively fill the Se vacancy in ZrSe2 to form P-type doping, thereby improving its conductivity. ZrSe2 modified by the PTSA material is first used as a hole transport layer (HTL) in organic solar cells (OSCs). The efficiency of OSCs based on the PBDB-T:ITIC and PM6:L8-BO binary active layer with ZrSe2:PTSA as the novel HTL reaches 10.66 and 18.14%, which are obviously higher than the efficiency of OSCs with pure ZrSe2 as the HTL (8.48 and 15.64%). More interestingly, the stability of the device with ZrSe2:PTSA as HTL is significantly better than that of PEDOT:PSS. This study shows that the modification of the organic material can effectively improve the photoelectric performance of ZrSe2 and explores the physical mechanism of the interaction between the organic modifier and 2D materials.
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Affiliation(s)
- Hongye Li
- School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China
| | - Jingyu Tan
- School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China
| | - Song Yang
- School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China
| | - Yapeng Sun
- School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China
| | - Huangzhong Yu
- School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China
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4
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Bianchi MG, Risplendi F, Re Fiorentin M, Cicero G. Engineering the Electrical and Optical Properties of WS 2 Monolayers via Defect Control. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2305162. [PMID: 38009517 PMCID: PMC10811516 DOI: 10.1002/advs.202305162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 09/25/2023] [Indexed: 11/29/2023]
Abstract
Two-dimensional (2D) materials as tungsten disulphide (WS2 ) are rising as the ideal platform for the next generation of nanoscale devices due to the excellent electric-transport and optical properties. However, the presence of defects in the as grown samples represents one of the main limiting factors for commercial applications. At the same time, WS2 properties are frequently tailored by introducing impurities at specific sites. Aim of this review paper is to present a complete description and discussion of the effects of both intentional and unintentional defects in WS2 , by an in depth analysis of the recent experimental and theoretical investigations reported in the literature. First, the most frequent intrinsic defects in WS2 are presented and their effects in the readily synthetized material are discussed. Possible solutions to remove and heal unintentional defects are also analyzed. Following, different doping schemes are reported, including the traditional substitution approach and innovative techniques based on the surface charge transfer with adsorbed atoms or molecules. The plethora of WS2 monolayer modifications presented in this review and the systematic analysis of the corresponding optical and electronic properties, represent strategic degrees of freedom the researchers may exploit to tailor WS2 optical and electronic properties for specific device applications.
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Affiliation(s)
- Michele Giovanni Bianchi
- Department of Applied Science and TechnologyPolitecnico di Torinocorso Duca degli Abruzzi 24Torino10129Italy
| | - Francesca Risplendi
- Department of Applied Science and TechnologyPolitecnico di Torinocorso Duca degli Abruzzi 24Torino10129Italy
| | - Michele Re Fiorentin
- Department of Applied Science and TechnologyPolitecnico di Torinocorso Duca degli Abruzzi 24Torino10129Italy
| | - Giancarlo Cicero
- Department of Applied Science and TechnologyPolitecnico di Torinocorso Duca degli Abruzzi 24Torino10129Italy
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5
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Xue F, Zhang C, Peng H, Liu F, Yan X, Yao Q, Hu Z, Chan TS, Liu M, Zhang J, Xu Y, Huang X. Nanotip-Induced Electric Field for Hydrogen Catalysis. NANO LETTERS 2023; 23:11827-11834. [PMID: 38079388 DOI: 10.1021/acs.nanolett.3c03845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2023]
Abstract
Local electric field induced by the lightning-rod effect attracts great attention for regulating the local microenvironment and electronic properties of active sites. Nevertheless, local electric-field-assisted applications are mainly limited to metals with strong surface plasmonic resonance properties (e.g., Au, Ag, and Cu). Herein, we fabricate RuCu snow-like nanosheets (SNSs) with high-curvature nanotips for enhancing the hydrogen oxidation reaction (HOR) and hydrogen evolution reaction (HER). Theoretical simulations show that RuCu SNSs can induce a strong local electric field around the sharp nanotips, which favors the accumulation of OH- for HOR and H+ for HER. Cu incorporation can modulate the binding strength of OH* and H*, leading to significantly enhanced HOR and HER performance. Impressively, the mass activity of RuCu SNSs for alkaline HOR is 31.3 times higher than that of RuCu nanocrystals without sharp tips. Besides, the required overpotential for reaching 10 mA cm-2 during HER over RuCu SNSs is 14.0 mV.
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Affiliation(s)
- Fei Xue
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Chunyang Zhang
- International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Hao Peng
- International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Feng Liu
- International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Xueli Yan
- International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Qing Yao
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Zhiwei Hu
- Max Planck Institute for Chemical Physics of Solids, Nothnitzer Strasse 40, Dresden 01187, Germany
| | - Ting-Shan Chan
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30076, Taiwan
| | - Maochang Liu
- International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Juntao Zhang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
- Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen 361005, China
| | - Yong Xu
- Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices, Collaborative Innovation Center of Advanced Energy Materials, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
| | - Xiaoqing Huang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
- Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen 361005, China
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6
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Gnanaguru MVL, Naushad M, Tatarchuk T, Ghangrekar MM, Chowdhury S. One-step calcination synthesis of 2D/2D g-C 3N 4/WS 2 van der Waals heterojunction for visible light-induced photocatalytic degradation of pharmaceutical pollutants. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023:10.1007/s11356-023-27714-7. [PMID: 37271787 DOI: 10.1007/s11356-023-27714-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 05/13/2023] [Indexed: 06/06/2023]
Abstract
It is well-documented that accumulation of pharmaceutically active compounds (PhACs), such as antibiotics, in aquatic ecosystems is a prominent environmental hazard. Herein, a series of 2D materials-based heterojunctions, conceptualized based on the integration of graphitic carbon nitride (g-C3N4) with tungsten disulfide (WS2), was fabricated through a facile one-step calcination process, and systematically evaluated for eliminating tetracycline (TC) and sulfamethoxazole (SMX) from aqueous matrices. The microstructure, optical properties, and surface chemistry of the as-prepared composites were examined with a range of microscopy and spectroscopy techniques. In comparison with pristine g-C3N4 or bare WS2, the g-C3N4/WS2 material, with optimal WS2 loading, showed significantly improved photocatalytic activity, towards degradation of TC (84%) and SMX (96%), under visible light. Free radical scavenging experiments revealed that superoxide anions and hydroxyl radicals were predominantly responsible for the rapid breakdown of the PhACs. In addition, the dissociation intermediates and residues were identified and the plausible photocatalytic degradation pathways of TC and SMX over the as-constructed 2D/2D heterojunction were discussed. Further, the photocatalysis end products were non-toxic, as inferred via the resazurin cell viability assay, employing Escherichia coli as a model organism. Most importantly, the 2D/2D g-C3N4/WS2 architecture was structurally resilient and exhibited a fairly stable cycling performance for persistent usage in wastewater treatment. The outcomes of this study testify that 2D/2D heterojunction of g-C3N4 fragments and WS2 nanosheets holds great promise for destroying antibiotics or their metabolites, usually present in wastewaters.
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Affiliation(s)
- Mario Vino Lincy Gnanaguru
- School of Environmental Science and Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, 721302, India
| | - Mu Naushad
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
| | - Tetiana Tatarchuk
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa, 2, 30-387, Kraków, Poland
| | - Makarand M Ghangrekar
- Department of Civil Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, 721302, India
| | - Shamik Chowdhury
- School of Environmental Science and Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, 721302, India.
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7
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Hung CM, Dang DTX, Chanda A, Detellem D, Alzahrani N, Kapuruge N, Pham YTH, Liu M, Zhou D, Gutierrez HR, Arena DA, Terrones M, Witanachchi S, Woods LM, Srikanth H, Phan MH. Enhanced Magnetism and Anomalous Hall Transport through Two-Dimensional Tungsten Disulfide Interfaces. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13040771. [PMID: 36839139 PMCID: PMC9967397 DOI: 10.3390/nano13040771] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 02/14/2023] [Accepted: 02/16/2023] [Indexed: 05/14/2023]
Abstract
The magnetic proximity effect (MPE) has recently been explored to manipulate interfacial properties of two-dimensional (2D) transition metal dichalcogenide (TMD)/ferromagnet heterostructures for use in spintronics and valleytronics. However, a full understanding of the MPE and its temperature and magnetic field evolution in these systems is lacking. In this study, the MPE has been probed in Pt/WS2/BPIO (biphase iron oxide, Fe3O4 and α-Fe2O3) heterostructures through a comprehensive investigation of their magnetic and transport properties using magnetometry, four-probe resistivity, and anomalous Hall effect (AHE) measurements. Density functional theory (DFT) calculations are performed to complement the experimental findings. We found that the presence of monolayer WS2 flakes reduces the magnetization of BPIO and hence the total magnetization of Pt/WS2/BPIO at T > ~120 K-the Verwey transition temperature of Fe3O4 (TV). However, an enhanced magnetization is achieved at T < TV. In the latter case, a comparative analysis of the transport properties of Pt/WS2/BPIO and Pt/BPIO from AHE measurements reveals ferromagnetic coupling at the WS2/BPIO interface. Our study forms the foundation for understanding MPE-mediated interfacial properties and paves a new pathway for designing 2D TMD/magnet heterostructures for applications in spintronics, opto-spincaloritronics, and valleytronics.
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Affiliation(s)
- Chang-Ming Hung
- Department of Physics, University of South Florida, Tampa, FL 33620, USA
| | - Diem Thi-Xuan Dang
- Department of Physics, University of South Florida, Tampa, FL 33620, USA
| | - Amit Chanda
- Department of Physics, University of South Florida, Tampa, FL 33620, USA
| | - Derick Detellem
- Department of Physics, University of South Florida, Tampa, FL 33620, USA
| | - Noha Alzahrani
- Department of Physics, University of South Florida, Tampa, FL 33620, USA
| | - Nalaka Kapuruge
- Department of Physics, University of South Florida, Tampa, FL 33620, USA
| | - Yen T. H. Pham
- Department of Physics, University of South Florida, Tampa, FL 33620, USA
| | - Mingzu Liu
- Department of Physics, The Pennsylvania State University, University Park, PA 16802, USA
| | - Da Zhou
- Department of Physics, The Pennsylvania State University, University Park, PA 16802, USA
| | | | - Darío A. Arena
- Department of Physics, University of South Florida, Tampa, FL 33620, USA
| | - Mauricio Terrones
- Department of Physics, The Pennsylvania State University, University Park, PA 16802, USA
| | - Sarath Witanachchi
- Department of Physics, University of South Florida, Tampa, FL 33620, USA
| | - Lilia M. Woods
- Department of Physics, University of South Florida, Tampa, FL 33620, USA
- Correspondence: (L.M.W.); (M.-H.P.)
| | - Hariharan Srikanth
- Department of Physics, University of South Florida, Tampa, FL 33620, USA
| | - Manh-Huong Phan
- Department of Physics, University of South Florida, Tampa, FL 33620, USA
- Correspondence: (L.M.W.); (M.-H.P.)
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8
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Vacancy-induced tensile strain of CdS/Bi2S3 as a highly performance and robust photocatalyst for hydrogen evolution. J Colloid Interface Sci 2023; 630:224-234. [DOI: 10.1016/j.jcis.2022.10.056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 10/11/2022] [Accepted: 10/13/2022] [Indexed: 11/07/2022]
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9
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Shao J, Su W. Tip-enhanced nanoscopy of two-dimensional transition metal dichalcogenides: progress and perspectives. NANOSCALE 2022; 14:17119-17133. [PMID: 36394273 DOI: 10.1039/d2nr04864g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The optoelectronic properties of two-dimensional (2D) transition metal dichalcogenide (TMD) thin layers prepared by exfoliation or chemical vapour deposition are strongly modulated by defects at the nanoscale. The mediated electronic and optical properties are expected to be spatially localised in a nanoscale width neighbouring the defects. Characterising such localised properties requires an analytical tool with nanoscale spatial resolution and high optical sensitivity. In recent years, tip-enhanced nanoscopy, represented by tip-enhanced Raman spectroscopy (TERS) and tip-enhanced photoluminescence (TEPL), has emerged as a powerful tool to characterise the localised phonon and exciton behaviours of 2D TMDs and heterojunctions (HJs) at the nanoscale. Herein, we first summarise the recent progress of TERS and TEPL in the characterisation of several typical defects in TMDs, such as edges, wrinkles, grain boundaries and other defects generated in transfer and growth processes. Then the local strain and its dynamic control of phonon and exciton behaviours characterised by TERS and TEPL will be reviewed. The recent progress in characterising TMD HJs using TERS and TEPL will be subsequently summarised. Finally, the progress of TERS and TEPL combined with optoelectronic sensitive electronic scanning probe microscopy (SPM) in the applications of TMDs will be reviewed.
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Affiliation(s)
- Jiaqi Shao
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China
| | - Weitao Su
- School of Sciences, Hangzhou Dianzi University, Hangzhou, 310018, China.
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10
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Park J, Bong S, Park J, Lee E, Ju SY. Hierarchical van der Waals Heterostructure Strategy to Form Stable Transition Metal Dichalcogenide Dispersions. ACS APPLIED MATERIALS & INTERFACES 2022; 14:50308-50317. [PMID: 36286548 DOI: 10.1021/acsami.2c12592] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Although various methods have been developed to disperse transition metal dichalcogenides (TMDCs) in aqueous environments, the methodology to generate stable TMDC dispersions remains challenging. Here, we developed a hierarchical van der Waals (vdW) heterostructure-based strategy to disperse few-layered TMDCs (WS2, MoS2, WSe2, and MoSe2) using both hexagonal boron nitride (hBN) and sodium cholate (SC) as synergistic vdW surfactants. By showing long-term stability of up to 3 years, the extinction spectra of these TMDC/hBN/SC dispersions exhibit the most blue-shifted excitonic transitions, low background extinction, good colloidal stability, and dispersion stability upon ultracentrifugation compared to other dispersion methods. Hierarchical stacking having TMDCs and hBN/SC as core and shell parts is probed by electrostatic/atomic force microscopy and zeta potential, and its origin was attributed to surface energy matches. Along with the synergetic effect between TMDCs and hBN, the blue shift was ascribed to compressive strain on the TMDCs caused by hBN wrapping. The results of transmission electron microscopy show that the TMDCs in the dispersions have defective, few-layered structures with flake sizes that are less than a few hundred nm2. Raman spectroscopy is used to study not only the existence of compressive strain but also various interlayer coupling between TMDC and hBN. The hierarchical structures of TMDC/hBN/SC are discussed in terms of surface energies and topographies. This method is invaluable to provide a general methodology to disperse various surface-corrugated dimensional materials for various dispersion-based applications.
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Affiliation(s)
- Junmo Park
- Department of Chemistry, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Republic of Korea
| | - Sungmin Bong
- Department of Chemistry, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Republic of Korea
| | - Jaehyun Park
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Eunji Lee
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Sang-Yong Ju
- Department of Chemistry, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Republic of Korea
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11
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Avilés MO, Jelken J, Lagugné-Labarthet F. Periodic Spiral Ripples on VS 2 Flakes: A Tip-Enhanced Raman Investigation. J Phys Chem Lett 2022; 13:9771-9776. [PMID: 36226836 DOI: 10.1021/acs.jpclett.2c02555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Using atmospheric-pressure chemical vapor deposition, we have synthesized vanadium disulfide (VS2) flakes with a metallic 1T phase that display nanoscale spiral surface ripples. To understand the origin of these chiral patterns in these transition metal dichalcogenides, tip-enhanced Raman spectroscopy and Kelvin probe force microscopies were jointly used to investigate their crystal structure, possible oxidation, and electronic properties, respectively. We found that the surface corrugation consists of small crystalline domains with distinct orientations. The change in local orientation is observed concomitantly with a spectral shift of the lattice modes of VS2 and results in the formation of grain boundaries between the domains with distinct orientation. Additionally, the periodic surface structure is modulating the work function of VS2 by 14 meV.
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Affiliation(s)
- María Olivia Avilés
- The Center for Advanced Materials and Biomaterials (CAMBR), Department of Chemistry, The University of Western Ontario (Western University), London, OntarioN6A 5B7, Canada
| | - Joachim Jelken
- The Center for Advanced Materials and Biomaterials (CAMBR), Department of Chemistry, The University of Western Ontario (Western University), London, OntarioN6A 5B7, Canada
| | - François Lagugné-Labarthet
- The Center for Advanced Materials and Biomaterials (CAMBR), Department of Chemistry, The University of Western Ontario (Western University), London, OntarioN6A 5B7, Canada
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12
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Chen C, Zhang W, Duan P, Liu W, Shafi M, Hu X, Zhang C, Zhang C, Man B, Liu M. SERS enhancement induced by the Se vacancy defects in ultra-thin hybrid phase SnSe x nanosheets. OPTICS EXPRESS 2022; 30:37795-37814. [PMID: 36258361 DOI: 10.1364/oe.473965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Accepted: 09/16/2022] [Indexed: 06/16/2023]
Abstract
Improving the photo-induced charge transfer (PICT) efficiency by adjusting the energy levels difference between adsorbed probe molecules and substrate materials is a key factor for boosting the surface enhanced Raman scattering (SERS) based on the chemical mechanism (CM). Herein, a new route to improve the SERS activity of two-dimensional (2D) selenium and tin compounds (SnSex, 1 ≤ x ≤ 2) by the hybrid phase materials is researched. The physical properties and the energy band structure of SnSex were analyzed. The enhanced SERS activity of 2D SnSex can be attribute to the coupling of the PICT resonance caused by the defect energy levels induced by Se vacancy and the molecular resonance Raman scattering (RRS). This established a relationship between the physical properties and SERS activity of 2D layered materials. The resonance probe molecule, rhodamine (R6G), which is used to detect the SERS performance of SnSex nanosheets. The enhancement factor (EF) of R6G on the optimized SnSe1.35 nanosheets can be as high as 2.6 × 106, with a detection limit of 10-10 M. The SERS result of the environmental pollution, thiram, shows that the SnSex nanosheets have a practical application in trace SERS detection, without the participation of metal particles. These results demonstrate that, through hybrid phase materials, the SERS sensitivity of 2D layered nanomaterials can be improved. It provides a kind of foreground non-metal SERS substrate in monitoring or detecting and provide a deep insight into the chemical SERS mechanism based on 2D layered materials.
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13
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Das A, Roy D, Kumar Das B, Ansari MI, Chattopadhyay KK, Sarkar S. Zinc doping induced WS2 accelerating the HER and ORR kinetics: A theoretical and experimental validation. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.10.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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14
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Kayal A, Barman PK, Sarma PV, Shaijumon MM, Kini RN, Mitra J. Symmetric domain segmentation in WS 2flakes: correlating spatially resolved photoluminescence, conductance with valley polarization. NANOTECHNOLOGY 2022; 33:495203. [PMID: 36041399 DOI: 10.1088/1361-6528/ac8d9d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 08/30/2022] [Indexed: 06/15/2023]
Abstract
The incidence of intra-flake heterogeneity of spectroscopic and electrical properties in chemical vapour deposited (CVD) WS2flakes is explored in a multi-physics investigation via spatially resolved spectroscopic maps correlated with electrical, electronic and mechanical properties. The investigation demonstrates that the three-fold symmetric segregation of spectroscopic response, in topographically uniform WS2flakes are accompanied by commensurate segmentation of electronic properties e.g. local carrier density and the differences in the mechanics of tip-sample interactions, evidenced via scanning probe microscopy phase maps. Overall, the differences are understood to originate from point defects, namely sulfur vacancies within the flake along with a dominant role played by the substrate. While evolution of the multi-physics maps upon sulfur annealing elucidates the role played by sulfur vacancy, substrate-induced effects are investigated by contrasting data from WS2flake on Si and Au surfaces. Local charge depletion induced by the nature of the sample-substrate junction in case of WS2on Au is seen to invert the electrical response with comprehensible effects on their spectroscopic properties. Finally, the role of these optoelectronic properties in preserving valley polarization that affects valleytronic applications in WS2flakes, is investigated via circular polarization discriminated photoluminescence experiments. The study provides a thorough understanding of spatial heterogeneity in optoelectronic properties of WS2and other transition metal chalcogenides, which are critical for device fabrication and potential applications.
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Affiliation(s)
- Arijit Kayal
- School of Physics, IISER Thiruvananthapuram, Kerala 695551, India
| | | | - Prasad V Sarma
- School of Physics, IISER Thiruvananthapuram, Kerala 695551, India
| | - M M Shaijumon
- School of Physics, IISER Thiruvananthapuram, Kerala 695551, India
| | - R N Kini
- School of Physics, IISER Thiruvananthapuram, Kerala 695551, India
| | - J Mitra
- School of Physics, IISER Thiruvananthapuram, Kerala 695551, India
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15
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Low-defect-density WS 2 by hydroxide vapor phase deposition. Nat Commun 2022; 13:4149. [PMID: 35851038 PMCID: PMC9293887 DOI: 10.1038/s41467-022-31886-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Accepted: 07/07/2022] [Indexed: 11/23/2022] Open
Abstract
Two-dimensional (2D) semiconducting monolayers such as transition metal dichalcogenides (TMDs) are promising channel materials to extend Moore’s Law in advanced electronics. Synthetic TMD layers from chemical vapor deposition (CVD) are scalable for fabrication but notorious for their high defect densities. Therefore, innovative endeavors on growth reaction to enhance their quality are urgently needed. Here, we report that the hydroxide W species, an extremely pure vapor phase metal precursor form, is very efficient for sulfurization, leading to about one order of magnitude lower defect density compared to those from conventional CVD methods. The field-effect transistor (FET) devices based on the proposed growth reach a peak electron mobility ~200 cm2/Vs (~800 cm2/Vs) at room temperature (15 K), comparable to those from exfoliated flakes. The FET device with a channel length of 100 nm displays a high on-state current of ~400 µA/µm, encouraging the industrialization of 2D materials. Chemical vapor deposition enables the scalable production of 2D semiconductors, but the grown materials are usually affected by high defect densities. Here, the authors report a hydroxide vapour phase deposition method to synthesize wafer-scale monolayer WS2 with reduced defect density and electrical properties comparable to those of exfoliated flakes.
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16
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Kato R, Moriyama T, Umakoshi T, Yano TA, Verma P. Ultrastable tip-enhanced hyperspectral optical nanoimaging for defect analysis of large-sized WS 2 layers. SCIENCE ADVANCES 2022; 8:eabo4021. [PMID: 35857514 PMCID: PMC9286508 DOI: 10.1126/sciadv.abo4021] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 06/03/2022] [Indexed: 05/25/2023]
Abstract
Optical nanoimaging techniques, such as tip-enhanced Raman spectroscopy (TERS), are nowadays indispensable for chemical and optical characterization in the entire field of nanotechnology and have been extensively used for various applications, such as visualization of nanoscale defects in two-dimensional (2D) materials. However, it is still challenging to investigate micrometer-sized sample with nanoscale spatial resolution because of severe limitation of measurement time due to drift of the experimental system. Here, we achieved long-duration TERS imaging of a micrometer-sized WS2 sample for 6 hours in a reproducible manner. Our ultrastable TERS system enabled to reveal the defect density on the surface of tungsten disulfide layers in large area equivalent to the device scale. It also helped us to detect rare defect-related optical signals from the sample. The present study paves ways to evaluate nanoscale defects of 2D materials in large area and to unveil remarkable optical and chemical properties of large-sized nanostructured materials.
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Affiliation(s)
- Ryo Kato
- Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
- Institute of Post-LED Photonics, Tokushima University, 2-1 Minamijosanjima, Tokushima, Tokushima 770-8506, Japan
| | - Toki Moriyama
- Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
| | - Takayuki Umakoshi
- Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
- Institute for Advanced Co-Creation Studies, Osaka University, Suita, Osaka 565-0871, Japan
- PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
| | - Taka-aki Yano
- Institute of Post-LED Photonics, Tokushima University, 2-1 Minamijosanjima, Tokushima, Tokushima 770-8506, Japan
| | - Prabhat Verma
- Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
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17
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Pan L, Miao P, Horneber A, Meixner AJ, Adam PM, Zhang D. Revealing local structural properties of an atomically thin MoSe 2 surface using optical microscopy. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2022; 13:572-581. [PMID: 35860454 PMCID: PMC9263549 DOI: 10.3762/bjnano.13.49] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Accepted: 06/02/2022] [Indexed: 06/15/2023]
Abstract
Using a triangular molybdenum diselenide (MoSe2) flake as surface-enhanced Raman spectroscopy (SERS) platform, we demonstrate the dependency of the Raman enhancement on laser beam polarization and local structure using copper phthalocyanine (CuPc) as probe. Second harmonic generation (SHG) and photoluminescence spectroscopy and microscopy are used to reveal the structural irregularities of the MoSe2 flake. The Raman enhancement in the focus of an azimuthally polarized beam, which possesses exclusively an in-plane electric field component is stronger than the enhancement by a focused radially polarized beam, where the out-of-plane electric field component dominates. This phenomenon indicates that the face-on oriented CuPc molecules strongly interact with the MoSe2 flake via charge transfer and dipole-dipole interaction. Furthermore, the Raman scattering maps on the irregular MoSe2 surface show a distinct correlation with the SHG and photoluminescence optical images, indicating the relationship between local structure and optical properties of the MoSe2 flake. These results contribute to understand the impacts of local structural properties on the Raman enhancement at the surface of the 2D transition-metal dichalcogenide.
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Affiliation(s)
- Lin Pan
- Institute of Physical and Theoretical Chemistry, Eberhard Karls University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany
- Laboratoire Lumière, nanomatériaux et nanotechnologies – L2n, Université de Technologie de Troyes & CNRS EMR 7004, 12 Rue Marie Curie, CS42060, 10004 Troyes Cedex, France
- Center for Light-Matter-Interaction, Sensors and Analytics (LISA+), Eberhard Karls University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany
| | - Peng Miao
- Institute of Physical and Theoretical Chemistry, Eberhard Karls University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany
- Center for Light-Matter-Interaction, Sensors and Analytics (LISA+), Eberhard Karls University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany
| | - Anke Horneber
- Institute of Physical and Theoretical Chemistry, Eberhard Karls University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany
- Center for Light-Matter-Interaction, Sensors and Analytics (LISA+), Eberhard Karls University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany
| | - Alfred J Meixner
- Institute of Physical and Theoretical Chemistry, Eberhard Karls University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany
- Center for Light-Matter-Interaction, Sensors and Analytics (LISA+), Eberhard Karls University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany
| | - Pierre-Michel Adam
- Laboratoire Lumière, nanomatériaux et nanotechnologies – L2n, Université de Technologie de Troyes & CNRS EMR 7004, 12 Rue Marie Curie, CS42060, 10004 Troyes Cedex, France
| | - Dai Zhang
- Institute of Physical and Theoretical Chemistry, Eberhard Karls University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany
- Center for Light-Matter-Interaction, Sensors and Analytics (LISA+), Eberhard Karls University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany
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Shao J, Chen F, Su W, Kumar N, Zeng Y, Wu L, Lu HW. Probing Nanoscale Exciton Funneling at Wrinkles of Twisted Bilayer MoS 2 Using Tip-Enhanced Photoluminescence Microscopy. J Phys Chem Lett 2022; 13:3304-3309. [PMID: 35389654 DOI: 10.1021/acs.jpclett.2c00815] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
In twisted bilayer (t2L) two-dimensional (2D) transition metal dichalcogenides, local strain at wrinkles strongly modulates the local exciton density and PL energy resulting in an exciton funneling effect. Probing such exciton behaviors especially at nanometer length scales is beyond the limit of conventional analytical tools due to the limited spatial resolution and low sensitivity. To address this challenge, herein we applied high-resolution tip-enhanced photoluminescence (TEPL) microscopy to investigate exciton funneling at a wrinkle in a t2L MoS2 sample with a small twist angle of 0.5°. Owing to a spatial resolution of <10 nm, excitonic behavior at nanoscale sized wrinkles could be visualized using TEPL imaging. Detailed investigation of nanoscale exciton funneling at the wrinkles revealed a deformation potential of -54 meV/%. The obtained results provide novel insights into the inhomogeneities of excitonic behaviors at nanoscale and would be helpful in facilitating the rational design of 2D material-based twistronic devices.
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Affiliation(s)
- Jiaqi Shao
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
| | - Fei Chen
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
| | - Weitao Su
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
- School of Sciences, Hangzhou Dianzi University, Hangzhou 310018, China
| | - Naresh Kumar
- Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
| | - Yijie Zeng
- School of Sciences, Hangzhou Dianzi University, Hangzhou 310018, China
| | - Ling Wu
- School of Sciences, Hangzhou Dianzi University, Hangzhou 310018, China
| | - Hong-Wei Lu
- School of Sciences, Hangzhou Dianzi University, Hangzhou 310018, China
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19
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Verma D, Kumar P, Mukherjee S, Thakur D, Singh CV, Balakrishnan V. Interplay between Thermal Stress and Interface Binding on Fracture of WS 2 Monolayer with Triangular Voids. ACS APPLIED MATERIALS & INTERFACES 2022; 14:16876-16884. [PMID: 35353490 DOI: 10.1021/acsami.2c00901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The defect engineering of two-dimensional (2D) materials has become a pivotal strategy for tuning the electrical and optical properties of the material. However, the reliable application of these atomically thin materials in practical devices require careful control of structural defects to avoid premature failure. Herein, a systematic investigation is presented to delineate the complex interactions among structural defects, the role of thermal mismatch between WS2 monolayer and different substrates, and their consequent effect on the fracture behavior of the monolayer. Detailed microscopic and Raman/PL spectroscopic observations enabled a direct correlation between thermal mismatch stress and crack patterns originating from the corner of faceted voids in the WS2 monolayer. Aberration-corrected STEM-HAADF imaging reveals the tensile strain localization around the faceted void corners. Density functional theory (DFT) simulations on interfacial interaction between the substrate (Silicon and sapphire -Al2O3) and monolayer WS2 revealed a binding energy between WS2 and Si substrate is 20 times higher than that with a sapphire substrate. This increased interfacial interaction in WS2 and substrate-aided thermal mismatch stress arising due to difference in thermal expansion coefficient to a maximum extent leading to fracture in monolayer WS2. Finite element simulations revealed the stress distribution near the void in the WS2 monolayer, where the maximum stress was concentrated at the void tip.
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Affiliation(s)
- Divya Verma
- School of Engineering, Indian Institute of Technology, Mandi, Himachal Pradesh 175075, India
| | - Pawan Kumar
- School of Engineering, Indian Institute of Technology, Mandi, Himachal Pradesh 175075, India
- Department of Electrical and System Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Sankha Mukherjee
- Department of Materials Science and Engineering, University of Toronto, Toronto, Ontario M5S 3E4, Canada
- Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur, West Bengal 721302, India
| | - Deepa Thakur
- School of Engineering, Indian Institute of Technology, Mandi, Himachal Pradesh 175075, India
| | - Chandra Veer Singh
- Department of Materials Science and Engineering, University of Toronto, Toronto, Ontario M5S 3E4, Canada
| | - Viswanath Balakrishnan
- School of Engineering, Indian Institute of Technology, Mandi, Himachal Pradesh 175075, India
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20
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Garg S, Fix JP, Krayev AV, Flanery C, Colgrove M, Sulkanen AR, Wang M, Liu GY, Borys NJ, Kung P. Nanoscale Raman Characterization of a 2D Semiconductor Lateral Heterostructure Interface. ACS NANO 2022; 16:340-350. [PMID: 34936762 DOI: 10.1021/acsnano.1c06595] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The nature of the interface in lateral heterostructures of 2D monolayer semiconductors including its composition, size, and heterogeneity critically impacts the functionalities it engenders on the 2D system for next-generation optoelectronics. Here, we use tip-enhanced Raman scattering (TERS) to characterize the interface in a single-layer MoS2/WS2 lateral heterostructure with a spatial resolution of 50 nm. Resonant and nonresonant TERS spectroscopies reveal that the interface is alloyed with a size that varies over an order of magnitude─from 50 to 600 nm─within a single crystallite. Nanoscale imaging of the continuous interfacial evolution of the resonant and nonresonant Raman spectra enables the deconvolution of defect activation, resonant enhancement, and material composition for several vibrational modes in single-layer MoS2, MoxW1-xS2, and WS2. The results demonstrate the capabilities of nanoscale TERS spectroscopy to elucidate macroscopic structure-property relationships in 2D materials and to characterize lateral interfaces of 2D systems on length scales that are imperative for devices.
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Affiliation(s)
- Sourav Garg
- Department of Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - J Pierce Fix
- Department of Physics, Montana State University, Bozeman, Montana 59717, United States
| | | | - Connor Flanery
- Department of Physics, Montana State University, Bozeman, Montana 59717, United States
| | - Michael Colgrove
- Department of Physics, Montana State University, Bozeman, Montana 59717, United States
| | - Audrey R Sulkanen
- Department of Chemistry, University of California Davis, Davis, California 95616, United States
| | - Minyuan Wang
- Department of Chemistry, University of California Davis, Davis, California 95616, United States
| | - Gang-Yu Liu
- Department of Chemistry, University of California Davis, Davis, California 95616, United States
| | - Nicholas J Borys
- Department of Physics, Montana State University, Bozeman, Montana 59717, United States
| | - Patrick Kung
- Department of Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States
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21
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Park DY, Yu HM, Jeong BG, An SJ, Kim SH, Jeong MS. Nano-Thermal Analysis of Defect-Induced Surface Pre-Melting in 2D Tellurium. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:2735. [PMID: 34685174 PMCID: PMC8541556 DOI: 10.3390/nano11102735] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 10/06/2021] [Accepted: 10/12/2021] [Indexed: 01/18/2023]
Abstract
Thermal properties, such as thermal conductivity, heat capacity, and melting temperature, influence the efficiency and stability of two-dimensional (2D) material applications. However, existing studies on thermal characteristics-except for thermal conductivity-are insufficient for 2D materials. Here, we investigated the melting temperature of 2D Tellurium (2D Te) using the nano-thermal analysis technique and found anomalous behavior that occurs before the melting temperature is reached. The theoretical calculations present surface pre-melting in 2D Te and Raman scattering measurements suggest that defects in 2D Te accelerate surface pre-melting. Understanding the pre-melting surface characteristics of 2D Te will provide valuable information for practical applications.
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Affiliation(s)
- Dae Young Park
- Department of Physics, Hanyang University, Seoul 04763, Korea; (D.Y.P.); (S.-J.A.)
| | - Hyang Mi Yu
- Department of Energy Science, Sungkyunkwan University, Suwon 16419, Korea; (H.M.Y.); (B.G.J.); (S.H.K.)
| | - Byeong Geun Jeong
- Department of Energy Science, Sungkyunkwan University, Suwon 16419, Korea; (H.M.Y.); (B.G.J.); (S.H.K.)
| | - Sung-Jin An
- Department of Physics, Hanyang University, Seoul 04763, Korea; (D.Y.P.); (S.-J.A.)
| | - Sung Hyuk Kim
- Department of Energy Science, Sungkyunkwan University, Suwon 16419, Korea; (H.M.Y.); (B.G.J.); (S.H.K.)
| | - Mun Seok Jeong
- Department of Physics, Hanyang University, Seoul 04763, Korea; (D.Y.P.); (S.-J.A.)
- Department of Energy Engineering, Hanyang University, Seoul 04763, Korea
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22
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Shao J, Chen F, Su W, Zeng Y, Lu HW. Multimodal Nanoscopic Study of Atomic Diffusion and Related Localized Optoelectronic Response of WS 2/MoS 2 Lateral Heterojunctions. ACS APPLIED MATERIALS & INTERFACES 2021; 13:20361-20370. [PMID: 33890458 DOI: 10.1021/acsami.1c03061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The atomic diffusion in transition metal dichalcogenides (TMDs) van der Waals heterojunctions (HJs) strongly modifies their optoelectronic properties in the nanoscale. However, probing such localized properties challenges the spatial resolution and the sensitivity of a variety of analytic tools. Herein, a multimodal nanoscopy (based on tip enhanced Raman spectroscopy (TERS) and photoluminescence (TEPL)) combined with the Kelvin probe force microscopy (KPFM) method was used to probe such nanoscale localized optoelectronic properties induced by atomic diffusion. Chemical vapor deposition (CVD)-grown lateral bilayer (2L) WS2/MoS2 HJs were imaged with a spatial resolution better than 40 nm via TERS and TEPL mapping by using intrinsic Raman and photoluminescence (PL) peaks. The contact potential difference (CPD), capacitance, and PL variation in a nanoscale vicinity of the HJ interface can be correlated to the local stoichiometry variation determined by TERS. The diffusion coefficients of W and Mo were obtained to be ∼0.5 × 10-12 and ∼1 × 10-12 cm2/s, respectively, by using Fick's second law. The obtained results would be useful to further understand the localized optoelectronic response of the TMDs HJs.
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Affiliation(s)
- Jiaqi Shao
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, 310018 Hangzhou, P. R. China
| | - Fei Chen
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, 310018 Hangzhou, P. R. China
| | - Weitao Su
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, 310018 Hangzhou, P. R. China
- School of Sciences, Hangzhou Dianzi University, 310018 Hangzhou, P. R. China
| | - Yijie Zeng
- School of Sciences, Hangzhou Dianzi University, 310018 Hangzhou, P. R. China
| | - Hong-Wei Lu
- School of Sciences, Hangzhou Dianzi University, 310018 Hangzhou, P. R. China
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23
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Xu L, Chen X, Guo W, Zeng L, Yang T, Xiong P, Chen Q, Zhang J, Wei M, Qian Q. Co-construction of sulfur vacancies and carbon confinement in V 5S 8/CNFs to induce an ultra-stable performance for half/full sodium-ion and potassium-ion batteries. NANOSCALE 2021; 13:5033-5044. [PMID: 33646222 DOI: 10.1039/d0nr08788b] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The construction of anode materials for sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) with a high energy and a long lifespan is significant and still challenging. Here, sulfur-defective vanadium sulfide/carbon fiber composites (D-V5S8/CNFs) are designed and fabricated by a facile electrospinning method, followed by sulfuration treatment. The unique architecture, in which V5S8 nanoparticles are confined inside the carbon fiber, provides a short-range channel and abundant adsorption sites for ion storage. Moreover, enlarged interlayer spacings could also alleviate the volume changes, and offer small vdW interactions and ionic diffusion resistance to store more Na and K ions reversibly and simultaneously. The DFT calculations further demonstrate that sulfur defects can effectively facilitate the adsorption behavior of Na+ and K+ and offer low energy barriers for ion intercalation. Taking advantage of the functional integration of these merits, the D-V5S8/CNF anode exhibits excellent storage performance and long-term cycling stability. It reveals a high capacity of 462 mA h g-1 at a current density of 0.2 A g-1 in SIBs, while it is 350 mA h g-1 at 0.1 A g-1 in PIBs, as well as admirable long-term cycling characteristics (190 mA h g-1/17 000 cycles/5 A g-1 for SIBs and 165 mA h g-1/3000 cycles/1 A g-1 for PIBs). Practically, full SIBs upon pairing with a Na3V2(PO4)3 cathode also exhibit superior performance.
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Affiliation(s)
- Lihong Xu
- Engineering Research Center of Polymer Green Recycling of Ministry of Education, College of Environmental Science and Engineering, Fujian Normal University, Fuzhou, Fujian 35007, China.
| | - Xiaochuan Chen
- Engineering Research Center of Polymer Green Recycling of Ministry of Education, College of Environmental Science and Engineering, Fujian Normal University, Fuzhou, Fujian 35007, China. and Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, China
| | - Wenti Guo
- Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials College of Physics and Energy, Fujian Normal University, Fuzhou, Fujian 350117, China. and Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering, Fuzhou, Fujian 350117, China
| | - Lingxing Zeng
- Engineering Research Center of Polymer Green Recycling of Ministry of Education, College of Environmental Science and Engineering, Fujian Normal University, Fuzhou, Fujian 35007, China. and Fujian Key Laboratory of Pollution Control & Resource Reuse, Fuzhou, Fujian 350007, China and Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071, China
| | - Tao Yang
- TEMA-NRG, Mechanical Engineering Department University of Aveiro, 3810-193 Aveiro, Portugal
| | - Peixun Xiong
- Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, Fuzhou University, Fuzhou, Fujian 350002, China
| | - Qinghua Chen
- Engineering Research Center of Polymer Green Recycling of Ministry of Education, College of Environmental Science and Engineering, Fujian Normal University, Fuzhou, Fujian 35007, China. and Fujian Key Laboratory of Pollution Control & Resource Reuse, Fuzhou, Fujian 350007, China
| | - Jianmin Zhang
- Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials College of Physics and Energy, Fujian Normal University, Fuzhou, Fujian 350117, China. and Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering, Fuzhou, Fujian 350117, China
| | - Mingdeng Wei
- Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, Fuzhou University, Fuzhou, Fujian 350002, China
| | - Qingrong Qian
- Engineering Research Center of Polymer Green Recycling of Ministry of Education, College of Environmental Science and Engineering, Fujian Normal University, Fuzhou, Fujian 35007, China. and Fujian Key Laboratory of Pollution Control & Resource Reuse, Fuzhou, Fujian 350007, China and Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071, China
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Sam RT, Umakoshi T, Verma P. Probing stacking configurations in a few layered MoS 2 by low frequency Raman spectroscopy. Sci Rep 2020; 10:21227. [PMID: 33277575 PMCID: PMC7718217 DOI: 10.1038/s41598-020-78238-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 11/18/2020] [Indexed: 11/11/2022] Open
Abstract
Novel two-dimensional (2D) layered materials, such as MoS2, have recently gained a significant traction, chiefly due to their tunable electronic and optical properties. A major attribute that affects the tunability is the number of layers in the system. Another important, but often overlooked aspect is the stacking configuration between the layers, which can modify their electro-optic properties through changes in internal symmetries and interlayer interactions. This demands a thorough understanding of interlayer stacking configurations of these materials before they can be used in devices. Here, we investigate the spatial distribution of various stacking configurations and variations in interlayer interactions in few-layered MoS2 flakes probed through the low-frequency Raman spectroscopy, which we establish as a versatile imaging tool for this purpose. Some interesting anomalies in MoS2 layer stacking, which we propose to be caused by defects, wrinkles or twist between the layers, are also reported here. These types of anomalies, which can severely affect the properties of these materials can be detected through low-frequency Raman imaging. Our findings provide useful insights for understanding various structure-dependent properties of 2D materials that could be of great importance for the development of future electro-optic devices, quantum devices and energy harvesting systems.
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Affiliation(s)
- Rhea Thankam Sam
- Department of Applied Physics, Osaka University, Suita, Osaka, 565-0871, Japan
| | - Takayuki Umakoshi
- Department of Applied Physics, Osaka University, Suita, Osaka, 565-0871, Japan.,PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama, 332-0012, Japan
| | - Prabhat Verma
- Department of Applied Physics, Osaka University, Suita, Osaka, 565-0871, Japan.
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Zhao Y, Zhang S, Shi Y, Zhang Y, Saito R, Zhang J, Tong L. Characterization of Excitonic Nature in Raman Spectra Using Circularly Polarized Light. ACS NANO 2020; 14:10527-10535. [PMID: 32790282 DOI: 10.1021/acsnano.0c04467] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We propose a technique of Raman spectroscopy to characterize the excitonic nature and to evaluate the relative contribution of the two kinds of electron/exciton-phonon interactions that are observed in two-dimensional transition-metal dichalcogenides (TMDCs). In the TMDCs, the electron/exciton-phonon interactions mainly originate from the deformation potential (DP) or the Fröhlich interaction (FI) which give the mutually different Raman tensors. Using a circularly polarized light, the relative proportion of the DP and the FI can be defined by the ratio of helicity-polarized intensity that is observed by MoS2. By this analysis, we show that the excitonic FI interaction gradually increases with decreasing temperature, contributes equally to DP at ∼230 K, and dominates at lower temperatures. The excitonic effect in the Raman spectra is confirmed by modulating the dielectric environment for the exciton and by changing the laser power.
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Affiliation(s)
- Yan Zhao
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, P.R. China
- Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P.R. China
| | - Shishu Zhang
- Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P.R. China
| | - Yuping Shi
- Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P.R. China
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
| | - Yanfeng Zhang
- Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P.R. China
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
| | - Riichiro Saito
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - Jin Zhang
- Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P.R. China
| | - Lianming Tong
- Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P.R. China
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Sarmah HJ, Mohanta D, Saha A. Perceptible exciton-to-trion conversion and signature of defect mediated vibronic modes and spin relaxation in nanoscale WS 2 exposed to γ-rays. NANOTECHNOLOGY 2020; 31:285706. [PMID: 32126535 DOI: 10.1088/1361-6528/ab7c4a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In this work, we report manifested optical, optoelectronic and spin-spin relaxation features of a few layered tungsten disulphide (WS2) nanosheets subjected to energetic γ-photons (∼1.3 MeV) emitted from a Co60 source. Upon intense irradiation (dose = 96 kGy), a slight departure from the pure hexagonal phase was realized with the introduction of the trigonal phase at large. Moreover, in the Raman spectra, as a consequence of the radiation-induced effect, an apparent improvement of the E-to-A mode intensity and a reduction in phonon lifetimes have been realized, with the latter being dependent on the linewidths. The emergence of the new peak (D) maxima observable at ∼406 cm-1 in the Raman spectra and ∼680 nm in the photoluminescence (PL) spectra can be attributed to the introduction of defect centres owing to realization of sulphur vacancies (V S) in the irradiated nanoscale WS2. Additionally, neutral exciton to charged exciton (trion) conversion is anticipated in the overall PL characteristics. The PL decay dynamics, while following bi-exponential trends, have revealed ample improvement in both the fast parameter (0.39 ± 0.01 ns to 1.88 ± 0.03 ns) and the slow parameter (2.36 ± 0.03 ns to 12.1 ± 0.4 ns) after γ-impact. We attribute this to the finite band gap expansion and the incorporation of new localized states within the gap, respectively. A declining exciton annihilation rate is also witnessed. The isotropic nature of the electron paramagnetic resonance spectra as a consequence of γ-exposure would essentially characterize a uniform distribution of the paramagnetic species in the system, while predicting a three-fold improvement of relative spin density at 96 kGy. Exploring defect dynamics and spin dynamics in 2D nanoscale systems does not only strengthen fundamental insight but can also offer ample scope for designing suitable components in the areas of miniaturized optoelectronic and spintronic devices.
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Affiliation(s)
- Hemanga Jyoti Sarmah
- Nanoscience and Soft-Matter Laboratory, Department of Physics, Tezpur University, Napaam, Tezpur-784028, India
| | - Dambarudhar Mohanta
- Nanoscience and Soft-Matter Laboratory, Department of Physics, Tezpur University, Napaam, Tezpur-784028, India
| | - Abhijit Saha
- UGC-DAE Consortium for Scientific Research, Kolkata Centre, Sector III/LB-8, Bidhan Nagar, Kolkata 700098, India
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27
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Kim E, Lee C, Song J, Kwon S, Kim B, Kim DH, Park TJ, Jeong MS, Kim DW. MoS 2 Monolayers on Au Nanodot Arrays: Surface Plasmon, Local Strain, and Interfacial Electronic Interaction. J Phys Chem Lett 2020; 11:3039-3044. [PMID: 32223266 DOI: 10.1021/acs.jpclett.0c00691] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Metal and transition-metal dichalcogenide (TMD) hybrid systems have been attracting growing research attention because exciton-plasmon coupling is a desirable means of tuning the physical properties of TMD materials. Competing effects of metal nanostructures, such as the local electromagnetic field enhancement and luminescence quenching, affect the photoluminescence (PL) characteristics of metal/TMD nanostructures. In this study, we prepared TMD MoS2 monolayers on hexagonal arrays of Au nanodots and investigated their physical properties by micro-PL and surface photovoltage (SPV) measurements. MoS2 monolayers on bare Au nanodots exhibited higher PL intensities than those of MoS2 monolayers on 5-nm-thick Al2O3-coated Au nanodots. The Al2O3 spacer layer blocked charge transfer at the Au/MoS2 interface but allowed the transfer of mechanical strain to the MoS2 monolayers on the nanodots. The SPV mapping results revealed not only the electron-transfer behavior at the Au/MoS2 contacts but also the lateral drift of charge carriers at the MoS2 surface under light illumination, which corresponds to nonradiative relaxation processes of the photogenerated excitons.
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Affiliation(s)
- Eunah Kim
- Department of Physics, Ewha Womans University, Seoul 03760, Korea
| | - Chanwoo Lee
- Department of Energy Science, Sungkyunkwan University, Suwon 16419, Korea
| | - Jungeun Song
- Department of Physics, Ewha Womans University, Seoul 03760, Korea
| | - Soyeong Kwon
- Department of Physics, Ewha Womans University, Seoul 03760, Korea
| | - Bora Kim
- Department of Physics, Ewha Womans University, Seoul 03760, Korea
| | | | | | - Mun Seok Jeong
- Department of Energy Science, Sungkyunkwan University, Suwon 16419, Korea
| | - Dong-Wook Kim
- Department of Physics, Ewha Womans University, Seoul 03760, Korea
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28
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Han S, Boguschewski C, Gao Y, Xiao L, Zhu J, van Loosdrecht PHM. Incoherent phonon population and exciton-exciton annihilation dynamics in monolayer WS 2 revealed by time-resolved Resonance Raman scattering. OPTICS EXPRESS 2019; 27:29949-29961. [PMID: 31684250 DOI: 10.1364/oe.27.029949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Accepted: 08/18/2019] [Indexed: 06/10/2023]
Abstract
Atomically thin layer transition metal dichalcogenides have been intensively investigated for their rich optical properties and potential applications on nano-electronics. In this work, we study the incoherent phonon and exciton population dynamics in monolayer WS2 by time-resolved Resonance Raman scattering spectroscopy. Upon excitation of the exciton transition, both Stokes and anti-Stokes scattering strength of the optical and the longitudinal acoustic two phonon modes exhibit large reduction. Based on the assumption of quasi-equilibrium distribution, the hidden phonon population dynamics is retrieved, which shows an instant build-up and a relaxation lifetime of ∼4 ps at the exciton density ∼1012cm-2. A phonon temperature rises of ∼20 K was identified due to the exciton excitation and relaxation. The exciton relaxation dynamics extracted from the transient vibrational Raman response shows strong excitation density dependence, signaling an important bi-molecular contribution to the decay. These results provide significant knowledge on the thermal dynamics after optical excitation, enhance the understanding of the fundamental exciton dynamics in two-dimensional transition metal materials, and demonstrate that time-resolved Resonance Raman scattering spectroscopy is a powerful method for exploring quasi-particle dynamics in optical materials.
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Alencar RS, Rabelo C, Miranda HLS, Vasconcelos TL, Oliveira BS, Ribeiro A, Públio BC, Ribeiro-Soares J, Filho AGS, Cançado LG, Jorio A. Probing Spatial Phonon Correlation Length in Post-Transition Metal Monochalcogenide GaS Using Tip-Enhanced Raman Spectroscopy. NANO LETTERS 2019; 19:7357-7364. [PMID: 31469281 DOI: 10.1021/acs.nanolett.9b02974] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The knowledge of the phonon coherence length is of great importance for two-dimensional-based materials since phonons can limit the lifetime of charge carriers and heat dissipation. Here we use tip-enhanced Raman spectroscopy (TERS) to measure the spatial correlation length Lc of the A1g1 and A1g2 phonons of monolayer and few-layer gallium sulfide (GaS). The differences in Lc values are responsible for different enhancements of the A1g modes, with A1g1 always enhancing more than the A1g2, independently of the number of GaS layers. For five layers, the results show an Lc of 64 and 47 nm for A1g1 and A1g2, respectively, and the coherence lengths decrease when decreasing the number of layers, indicating that scattering with the surface roughness plays an important role.
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Affiliation(s)
- R S Alencar
- Faculdade de Física , Universidade Federal do Pará , 66075-110 Belém-PA , Brazil
- Departamento de Física , Universidade Federal de Minas Gerais , Belo Horizonte , Minas Gerais 30270-901 , Brazil
- Departamento de Física , Centro de Ciências, Universidade Federal do Ceará , P. O. Box 6030, Fortaleza , Ceará 60455-900 , Brazil
| | - Cassiano Rabelo
- Programa de Pós-Graduação em Engenharia Elétrica , Universidade Federal de Minas Gerais , Av. Antônio Carlos 6627 , 31270-901 Belo Horizonte , MG , Brazil
| | - Hudson L S Miranda
- Programa de Pós-Graduação em Engenharia Elétrica , Universidade Federal de Minas Gerais , Av. Antônio Carlos 6627 , 31270-901 Belo Horizonte , MG , Brazil
| | - Thiago L Vasconcelos
- Divisão de Metrologia de Materiais , Instituto Nacional de Metrologia Qualidade e Tecnologia (INMETRO) , Duque de Caxias, Rio de Janeiro 25250-020 , Brazil
| | - Bruno S Oliveira
- Divisão de Metrologia de Materiais , Instituto Nacional de Metrologia Qualidade e Tecnologia (INMETRO) , Duque de Caxias, Rio de Janeiro 25250-020 , Brazil
| | - Aroldo Ribeiro
- Departamento de Física , Universidade Federal de Minas Gerais , Belo Horizonte , Minas Gerais 30270-901 , Brazil
| | - Bruno C Públio
- Departamento de Física , Universidade Federal de Minas Gerais , Belo Horizonte , Minas Gerais 30270-901 , Brazil
| | - Jenaina Ribeiro-Soares
- Departamento de Física , Universidade Federal de Lavras , Lavras , Minas Gerais 37200-000 , Brazil
| | - A G Souza Filho
- Departamento de Física , Centro de Ciências, Universidade Federal do Ceará , P. O. Box 6030, Fortaleza , Ceará 60455-900 , Brazil
| | - Luiz Gustavo Cançado
- Departamento de Física , Universidade Federal de Minas Gerais , Belo Horizonte , Minas Gerais 30270-901 , Brazil
| | - Ado Jorio
- Departamento de Física , Universidade Federal de Minas Gerais , Belo Horizonte , Minas Gerais 30270-901 , Brazil
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Govindasamy M, Wang SF, Jothiramalingam R, Noora Ibrahim S, Al-lohedan HA. A screen-printed electrode modified with tungsten disulfide nanosheets for nanomolar detection of the arsenic drug roxarsone. Mikrochim Acta 2019; 186:420. [DOI: 10.1007/s00604-019-3535-1] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 05/22/2019] [Indexed: 12/23/2022]
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31
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Chen TW, Rajaji U, Chen SM, Jothi Ramalingam R. A relative study on sonochemically synthesized mesoporous WS 2 nanorods & hydrothermally synthesized WS 2 nanoballs towards electrochemical sensing of psychoactive drug (Clonazepam). ULTRASONICS SONOCHEMISTRY 2019; 54:79-89. [PMID: 30833196 DOI: 10.1016/j.ultsonch.2019.02.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2018] [Revised: 01/31/2019] [Accepted: 02/15/2019] [Indexed: 06/09/2023]
Abstract
In this paper, mesoporous tungsten sulfide electrocatalyst (MP-WS2) were developed through a facile sonochemical technique (SC) and utilized as an electrocatalyst for the sensitive electrochemical detection of Psychoactive drug. The as-prepared SC-MP-WS2 NRs and HT-WS2 NPs (hydrothermally synthesized) were characterized using XRD, Raman, XPS, FESEM, HRTEM, BET, EDX, and electrochemical analysis, which exposed the formation of WS2 in the form of mesoporous nanorods in shape. Further, the use of the as-developed SC-MP-WS2 NRs and HT-WS2 NPs as an electrocatalyst for the detection of clonazepam (CNP). Interestingly, the SC-MP-WS2 NRs modified screen-printed carbon electrode (SC-MP-WS2 NRs/SPCE) exhibited an excellent electrocatalytic performance, and enhanced reduction peak current when compared to HT-WS2 NPs with unmodified electrode. Moreover, as-prepared SC-MP-WS2 NRs/SPCE displayed wide linear response range (10-551 µM), lower detection limit (2.37 nM) and high sensitivity (24.32 µAµM-1cm-2). Furthermore, SC-MP-WS2 NRs/SPCE showed an excellent selectivity even in the existence of potentially co-interfering compounds. The proposed sensor was successfully applied for the determination of CNP in biological and drug samples with acceptable recovery.
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Affiliation(s)
- Tse-Wei Chen
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan; Research and Development Center for Smart Textile Technology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan
| | - Umamaheswari Rajaji
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan
| | - Shen-Ming Chen
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan.
| | - R Jothi Ramalingam
- Surfactant Research Chair, Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
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