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Sahoo A, Dixit T, Anil Kumar KV, Lakshmi Ganapathi K, Nayak PK, Rao MSR, Krishnan S. Elucidating the Role of Electron Transfer in the Photoluminescence of MoS 2 Quantum Dots Synthesized by fs-Pulse Ablation. J Phys Chem Lett 2024; 15:5586-5593. [PMID: 38754086 DOI: 10.1021/acs.jpclett.4c00215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
Herein, MoS2 quantum dots (QDs) with controlled optical, structural, and electronic properties are synthesized using the femtosecond pulsed laser ablation in liquid (fs-PLAL) technique by varying the pulse width, ablation power, and ablation time to harness the potential for next-generation optoelectronics and quantum technology. Furthermore, this work elucidates key aspects of the mechanisms underlying the near-UV and blue emissions the accompanying large Stokes shift, and the consequent change in sample color with laser exposure parameters pertaining to MoS2 QDs. Through spectroscopic analysis, including UV-visible absorption, photoluminescence, and Raman spectroscopy, we successfully unraveled the mechanisms for the change in optoelectronic properties of MoS2 QDs with laser parameters. We realize that the occurrence of a secondary phase, specifically MoO3-x, is responsible for the significant Stokes shift and blue emission observed in this QD system. The primary factor influencing these activities is the electron transfer observed between these two phases, as validated by excitation-dependent photoluminescence and XPS and Raman spectroscopies.
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Affiliation(s)
- Anubhab Sahoo
- Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India
| | - Tejendra Dixit
- Optoelectronics and Quantum Devices Group, Department of Electronics and Communication Engineering, Indian Institute of Information Technology Design and Manufacturing Kancheepuram, Chennai 600127, India
| | - K V Anil Kumar
- Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India
| | - K Lakshmi Ganapathi
- 2D Materials Research and Innovation Group, Indian Institute of Technology Madras, Chennai 600036, India
- Quantum Center of Excellence for Diamond and Emergent Materials (QuCenDiEM) group, Indian Institute of Technology Madras, Chennai 600036, India
- Department of Physics, National Institute of Technology Kurukhetra, Kurukhetra 136119, India
| | - Pramoda K Nayak
- Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India
- 2D Materials Research and Innovation Group, Indian Institute of Technology Madras, Chennai 600036, India
- Centre for Nano and Material Sciences, Jain (Deemed-to-be University), Jain Global Campus, Kanakapura, Bangalore 562112, India
| | - M S Ramachandra Rao
- Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India
- Quantum Center of Excellence for Diamond and Emergent Materials (QuCenDiEM) group, Indian Institute of Technology Madras, Chennai 600036, India
| | - Sivarama Krishnan
- Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India
- Quantum Center of Excellence for Diamond and Emergent Materials (QuCenDiEM) group, Indian Institute of Technology Madras, Chennai 600036, India
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2
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Annušová A, Labudová M, Truchan D, Hegedűšová V, Švajdlenková H, Mičušík M, Kotlár M, Pribusová Slušná L, Hulman M, Salehtash F, Kálosi A, Csáderová L, Švastová E, Šiffalovič P, Jergel M, Pastoreková S, Majková E. Selective Tumor Hypoxia Targeting Using M75 Antibody Conjugated Photothermally Active MoO x Nanoparticles. ACS OMEGA 2023; 8:44497-44513. [PMID: 38046334 PMCID: PMC10688043 DOI: 10.1021/acsomega.3c01934] [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: 03/22/2023] [Revised: 07/24/2023] [Accepted: 11/02/2023] [Indexed: 12/05/2023]
Abstract
Photothermal therapy (PTT) mediated at the nanoscale has a unique advantage over currently used cancer treatments, by being spatially highly specific and minimally invasive. Although PTT combats traditional tumor treatment approaches, its clinical implementation has not yet been successful. The reasons for its disadvantage include an insufficient treatment efficiency or low tumor accumulation. Here, we present a promising new PTT platform combining a recently emerged two-dimensional (2D) inorganic nanomaterial, MoOx, and a tumor hypoxia targeting element, the monoclonal antibody M75. M75 specifically binds to carbonic anhydrase IX (CAIX), a hypoxia marker associated with many solid tumors with a poor prognosis. The as-prepared nanoconjugates showed highly specific binding to cancer cells expressing CAIX while being able to produce significant photothermal yield after irradiation with near-IR wavelengths. Small aminophosphonic acid linkers were recognized to be more effective over the combination of poly(ethylene glycol) chain and biotin-avidin-biotin bridge in constructing a PTT platform with high tumor-binding efficacy. The in vitro cellular uptake of nanoconjugates was visualized by high-resolution fluorescence microscopy and label-free live cell confocal Raman microscopy. The key to effective cancer treatment may be the synergistic employment of active targeting and noninvasive, tumor-selective therapeutic approaches, such as nanoscale-mediated PTT. The use of active targeting can streamline nanoparticle delivery increasing photothermal yield and therapeutic success.
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Affiliation(s)
- Adriana Annušová
- Institute
of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovakia
- Centre
for Advanced Materials Application, Slovak
Academy of Sciences, Dúbravská cesta 9, 845
11 Bratislava, Slovakia
| | - Martina Labudová
- Centre
for Advanced Materials Application, Slovak
Academy of Sciences, Dúbravská cesta 9, 845
11 Bratislava, Slovakia
- Institute
of Virology, Biomedical Research Center,
Slovak Academy of Sciences, Dúbravská cesta 9, 845 05 Bratislava, Slovakia
- Faculty
of Natural Sciences, Comenius University
in Bratislava, Ilkovičova
6, 842 15 Bratislava, Slovakia
| | - Daniel Truchan
- Institute
of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovakia
- Université
Sorbonne Paris Nord, Université Paris
Cité, Laboratory for Vascular Translational Science, LVTS,
INSERM, UMR 1148, Bobigny F-93017, France
| | - Veronika Hegedűšová
- Institute
of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovakia
- Faculty
of Natural Sciences, Comenius University
in Bratislava, Ilkovičova
6, 842 15 Bratislava, Slovakia
| | - Helena Švajdlenková
- Faculty
of Natural Sciences, Comenius University
in Bratislava, Ilkovičova
6, 842 15 Bratislava, Slovakia
- Polymer
Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41 Bratislava, Slovakia
| | - Matej Mičušík
- Polymer
Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41 Bratislava, Slovakia
| | - Mário Kotlár
- Centre
for Nanodiagnostics of Materials, Slovak
University of Technology in Bratislava, Vazovova 5, 812 43 Bratislava, Slovakia
| | - Lenka Pribusová Slušná
- Centre
for Advanced Materials Application, Slovak
Academy of Sciences, Dúbravská cesta 9, 845
11 Bratislava, Slovakia
- Institute
of Electrical Engineering, Slovak Academy of Sciences, Dúbravská cesta 9, 841 04 Bratislava, Slovakia
| | - Martin Hulman
- Institute
of Electrical Engineering, Slovak Academy of Sciences, Dúbravská cesta 9, 841 04 Bratislava, Slovakia
| | - Farnoush Salehtash
- Institute
of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovakia
| | - Anna Kálosi
- Institute
of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovakia
- Centre
for Advanced Materials Application, Slovak
Academy of Sciences, Dúbravská cesta 9, 845
11 Bratislava, Slovakia
| | - Lucia Csáderová
- Centre
for Advanced Materials Application, Slovak
Academy of Sciences, Dúbravská cesta 9, 845
11 Bratislava, Slovakia
- Institute
of Virology, Biomedical Research Center,
Slovak Academy of Sciences, Dúbravská cesta 9, 845 05 Bratislava, Slovakia
| | - Eliška Švastová
- Centre
for Advanced Materials Application, Slovak
Academy of Sciences, Dúbravská cesta 9, 845
11 Bratislava, Slovakia
- Institute
of Virology, Biomedical Research Center,
Slovak Academy of Sciences, Dúbravská cesta 9, 845 05 Bratislava, Slovakia
| | - Peter Šiffalovič
- Institute
of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovakia
- Centre
for Advanced Materials Application, Slovak
Academy of Sciences, Dúbravská cesta 9, 845
11 Bratislava, Slovakia
| | - Matej Jergel
- Institute
of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovakia
- Centre
for Advanced Materials Application, Slovak
Academy of Sciences, Dúbravská cesta 9, 845
11 Bratislava, Slovakia
| | - Silvia Pastoreková
- Institute
of Virology, Biomedical Research Center,
Slovak Academy of Sciences, Dúbravská cesta 9, 845 05 Bratislava, Slovakia
| | - Eva Majková
- Institute
of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovakia
- Centre
for Advanced Materials Application, Slovak
Academy of Sciences, Dúbravská cesta 9, 845
11 Bratislava, Slovakia
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3
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Ali A, Piatkowski P, Nawaz T, Ahmad S, Ibrahim T, Khamis M, Alnaser AS. A Two-Step Femtosecond Laser-Based Deposition of Robust Corrosion-Resistant Molybdenum Oxide Coating. MATERIALS (BASEL, SWITZERLAND) 2023; 16:909. [PMID: 36769916 PMCID: PMC9918068 DOI: 10.3390/ma16030909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 01/08/2023] [Accepted: 01/09/2023] [Indexed: 06/18/2023]
Abstract
A two-step femtosecond-pulsed laser deposition (fs-PLD) process is reported for the rapid development of uniform, poreless, crack-free, and well-adhering amorphous coatings of source materials with a high melting point. The first step comprises a high-rate raw deposition of the source material via fs-PLD, followed by a second step of scanning the raw sample with fs laser pulses of optimized fluence and scan parameters. The technique is applied to develop substoichiometric molybdenum oxide (MoOx, x < 3) coatings on mild steel. The thickness of the layer was ~4.25 μm with roughness around 0.27 μm. Comprehensive surface characterization reveals highly uniform and relatively moderate roughness coatings, implying the potential of these films as robust corrosion-resistant coats. Corrosion measurements in an aqueous NaCl environment revealed that the coated mild steel samples possess an average corrosion inhibition efficiency of around 95% relative to polished mild steel.
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Affiliation(s)
- Asghar Ali
- Department of Physics, American University of Sharjah, Sharjah 26666, United Arab Emirates
- Materials Science and Engineering Program, College of Arts and Sciences, American University of Sharjah, Sharjah 26666, United Arab Emirates
| | - Piotr Piatkowski
- Department of Physics, American University of Sharjah, Sharjah 26666, United Arab Emirates
- Materials Science and Engineering Program, College of Arts and Sciences, American University of Sharjah, Sharjah 26666, United Arab Emirates
| | - Tahir Nawaz
- Materials Science and Engineering Program, College of Arts and Sciences, American University of Sharjah, Sharjah 26666, United Arab Emirates
| | - Shahbaz Ahmad
- Materials Science and Engineering Program, College of Arts and Sciences, American University of Sharjah, Sharjah 26666, United Arab Emirates
| | - Taleb Ibrahim
- Materials Science and Engineering Program, College of Arts and Sciences, American University of Sharjah, Sharjah 26666, United Arab Emirates
- Department of Chemical Engineering, College of Engineering, American University of Sharjah, Sharjah 26666, United Arab Emirates
| | - Mustafa Khamis
- Materials Science and Engineering Program, College of Arts and Sciences, American University of Sharjah, Sharjah 26666, United Arab Emirates
- Department of Biology, Chemistry, and Environmental Sciences, College of Arts and Sciences, American University of Sharjah, Sharjah 26666, United Arab Emirates
| | - Ali S. Alnaser
- Department of Physics, American University of Sharjah, Sharjah 26666, United Arab Emirates
- Materials Science and Engineering Program, College of Arts and Sciences, American University of Sharjah, Sharjah 26666, United Arab Emirates
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4
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Abstract
Replacing precious metals with low-cost metals is the best solution for large scale production. Copper is known for its excellent conductivity and thermal management applications. When it comes to hydrogen evolution reaction, it is highly unstable, especially in KOH solution. In this paper, we approached a simple method to reduce corrosion and improve the performance by depositing nickel-molybdenum oxide and nickel on copper substrates and the achieved tafel slopes of 115 mV/dec and 117 mV/dec at 10 mA/cm2. While at first, molybdenum oxide coated samples showed better performance after 100 cycles of stability tests, the onset potential rapidly changed. Cu-Ni, which was deposited using the electron gun evaporation (e-gun), has shown better performance with 0.28 V at 10 mA/cm2 and led to stability after 100 cycles. Our results show that when copper is alloyed with nickel, it acts as a promising hydrogen evolution reaction (HER) catalyst.
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5
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Yang L, Chen W, Huang J, Tang X, Yang R, Zhang H, Tang Z, Gui X. Resistance Switching and Failure Behavior of the MoO x/Mo 2C Heterostructure. ACS APPLIED MATERIALS & INTERFACES 2021; 13:41857-41865. [PMID: 34432418 DOI: 10.1021/acsami.1c06663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
With the rapid demand for high-performance and power-efficient memristive and synaptic systems, more 2D heterostructures with improved resistance switching (RS) properties are still urgently in need for next-generation devices. Here, we report the RS behaviors of vertical MoOx/Mo2C heterostructures fabricated by controllable thermal oxidation and uncover the failure behavior for the first time. It is found that the MoOx/Mo2C heterostructure exhibits bipolar RS with a low set/reset voltage of +0.5/-0.3 V, an ultralow power consumption of 5 × 10-8 W, and an on/off ratio of 102, which is ascribed to the transport of the internal oxygen ions of MoOx. Furthermore, the failure behavior of RS behaviors of the MoOx/Mo2C heterostructure under a higher work voltage is revealed. It indicates that the amorphization of the pristine crystalline MoOx layer could block the movement of the internal oxygen ions in the vertical direction. The excellent RS performance induced by the synergy of MoOx and Mo2C and the demonstration of the failure behavior enable the potential applications of the 2D heterostructure in related memory devices and biological neural networks.
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Affiliation(s)
- Leilei Yang
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - Wenjun Chen
- School of Electronic and Information Engineering, Foshan University, Foshan 528000, China
| | - Junhua Huang
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - Xin Tang
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - Rongliang Yang
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - Hao Zhang
- Instrumental Analysis and Research Center (IARC), Sun Yat-sen University, Guangzhou 510275, China
| | - Zikang Tang
- Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau 999078, China
| | - Xuchun Gui
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
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6
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Shahrokhi M, Raybaud P, Le Bahers T. 2D MoO 3-xS x/MoS 2 van der Waals Assembly: A Tunable Heterojunction with Attractive Properties for Photocatalysis. ACS APPLIED MATERIALS & INTERFACES 2021; 13:36465-36474. [PMID: 34309377 DOI: 10.1021/acsami.1c08200] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Two-dimensional (2D) van der Waals (vdW) heterostructures currently have attracted much attention in widespread research fields where semiconductor materials are key. With the aim of gaining insights into photocatalytic materials, we use density functional theory (DFT) calculations within the HSE06 functional to analyze the evolution of optoelectronic properties and high-frequency dielectric constant profiles of various 2D MoO3-xSx/MoS2 heterostructures modified by chemical and physical approaches. Although the MoO3/MoS2 heterostructure is a type III heterojunction associated with a metallic character, we found that exchanging the terminal oxo atoms of the MoO3-xSx single layer (SL) with sulfur enables shifting its CB position above the VB position of the MoS2 SL. This trend gives rise to a type II heterojunction where the band gap and charge transfer within the two layers are driven continuously by the S concentration in the MoO3-xSx SL. This fine-tuning leads to a versatile type II heterostructure proposed to provide a direct Z-scheme system valuable for photocatalytic water splitting.
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Affiliation(s)
- Masoud Shahrokhi
- Univ Lyon, ENS de Lyon, CNRS, Université Claude Bernard Lyon 1, Laboratoire de Chimie UMR 5182, F-69342 Lyon, France
| | - Pascal Raybaud
- Univ Lyon, ENS de Lyon, CNRS, Université Claude Bernard Lyon 1, Laboratoire de Chimie UMR 5182, F-69342 Lyon, France
- IFP Energies nouvelles, Rond-point de l'échangeur de Solaize, BP 3, 69360 Solaize, France
| | - Tangui Le Bahers
- Univ Lyon, ENS de Lyon, CNRS, Université Claude Bernard Lyon 1, Laboratoire de Chimie UMR 5182, F-69342 Lyon, France
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7
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Abstract
Molybdenum disulfide (MoS2) is one of the compounds discussed nowadays due to its outstanding properties that allowed its usage in different applications. Its band gap and its distinctive structure make it a promising material to substitute graphene and other semiconductor devices. It has different applications in electronics especially sensors like optical sensors, biosensors, electrochemical biosensors that play an important role in the detection of various diseases’ like cancer and Alzheimer. It has a wide range of energy applications in batteries, solar cells, microwave, and Terahertz applications. It is a promising material on a nanoscale level, with favorable characteristics in spintronics and magnetoresistance. In this review, we will discuss MoS2 properties, structure and synthesis techniques with a focus on its applications and future challenges.
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8
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Simulation Study of Surface Transfer Doping of Hydrogenated Diamond by MoO 3 and V 2O 5 Metal Oxides. MICROMACHINES 2020; 11:mi11040433. [PMID: 32326123 PMCID: PMC7231313 DOI: 10.3390/mi11040433] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 04/16/2020] [Accepted: 04/17/2020] [Indexed: 11/17/2022]
Abstract
In this work, we investigate the surface transfer doping process that is induced between hydrogen-terminated (100) diamond and the metal oxides, MoO3 and V2O5, through simulation using a semi-empirical Density Functional Theory (DFT) method. DFT was used to calculate the band structure and charge transfer process between these oxide materials and hydrogen terminated diamond. Analysis of the band structures, density of states, Mulliken charges, adsorption energies and position of the Valence Band Minima (VBM) and Conduction Band Minima (CBM) energy levels shows that both oxides act as electron acceptors and inject holes into the diamond structure. Hence, those metal oxides can be described as p-type doping materials for the diamond. Additionally, our work suggests that by depositing appropriate metal oxides in an oxygen rich atmosphere or using metal oxides with high stochiometric ration between oxygen and metal atoms could lead to an increase of the charge transfer between the diamond and oxide, leading to enhanced surface transfer doping.
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9
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Ruan T, Wang B, Yang Y, Zhang X, Song R, Ning Y, Wang Z, Yu H, Zhou Y, Wang D, Liu H, Dou S. Interfacial and Electronic Modulation via Localized Sulfurization for Boosting Lithium Storage Kinetics. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2000151. [PMID: 32159890 DOI: 10.1002/adma.202000151] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 02/14/2020] [Accepted: 02/25/2020] [Indexed: 05/26/2023]
Abstract
Structural modulation endows electrochemical hybrids with promising energy storage properties owing to their adjustable interfacial and/or electronic characteristics. For MXene-based materials, however, the facile but effective strategies for tuning their structural properties at nanoscale are still lacking. Herein, 3D crumpled S-functionalized Ti3 C2 Tx substrate is rationally integrated with Fe3 O4 /FeS heterostructures via coprecipitation and subsequent partial sulfurization to induce a highly active and stable electrode architecture. The unique heterostructures with tuned electronic properties can induce improved kinetics and structural stability. The surface engineering by S terminations on the MXene further unlocks extra (pseudo)capacitive lithium storage. Serving as anode for lithium storage, the optimized electrode delivers an excellent long-term cycling stability (913.9 mAh g-1 after 1000 cycles at 1 A g-1 ) and superior rate capability (490.4 mAh g-1 at 10 A g-1 ). Moreover, the (de)lithiation pathways associated with energy storage mechanisms are further revealed by operando X-ray diffraction, in situ electroanalytical techniques, and first-principles calculations. The hybrid electrode is proved to undergo stepwise phase transformations during discharging but a relatively uniform reconversion during charging, suggesting an asymmetric conversion mechanism. This work provides a novel strategy for designing high-performance hybrids and paves the way for in-depth understanding of complex lithium intercalation and conversion reactions.
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Affiliation(s)
- Tingting Ruan
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Bo Wang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Yubo Yang
- College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing, 100124, China
| | - Xu Zhang
- College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing, 100124, China
| | - Rensheng Song
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Yu Ning
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Zhenbo Wang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Haijun Yu
- College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing, 100124, China
| | - Yu Zhou
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Dianlong Wang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Huakun Liu
- Institute for Superconducting and Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Wollongong, NSW, 2500, Australia
| | - Shixue Dou
- Institute for Superconducting and Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Wollongong, NSW, 2500, Australia
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10
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Yang L, Chen W, Yang R, Chen A, Zhang H, Sun Y, Jia Y, Li X, Tang Z, Gui X. Fabrication of MoO x/Mo 2C-Layered Hybrid Structures by Direct Thermal Oxidation of Mo 2C. ACS APPLIED MATERIALS & INTERFACES 2020; 12:10755-10762. [PMID: 32031373 DOI: 10.1021/acsami.9b18650] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Two-dimensional (2D) Mo2C, as a new member of transition metal carbides, has many intriguing properties and potential applications in superconductors and electronic devices. The thermal stability of 2D materials is essential for the performance of the related devices, especially the ones with a vertical heterostructure. However, rare reports have demonstrated the thermal stability of Mo2C and the effects of thermal stability on its performance. Here, we propose a facile and controllable method to directly oxidize Mo2C to MoOx, forming a MoOx/Mo2C heterostructure. During the oxidization process, an in situ technique is employed to uncover the transformation and thermal stability of the Mo2C. The chemical vapor deposition Mo2C shows high structural stability below 550 °C in Ar or below 350 °C in O2, which demonstrates the high thermal stability and antioxidation of the Mo2C film. The metallic Mo2C is gradually oxidized to semiconducting MoOx as the temperature increases above 350 °C. The oxidization rate can be easily controlled by adjusting the oxidation temperature and time. Further, the obtained MoOx/Mo2C vertical hybrid structure shows obvious Schottky junction behaviors, strongly indicating the perfect interfacial contact between the component layers. This work offers a new strategy for the controllable fabrication of high-quality 2D heterostructures.
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Affiliation(s)
- Leilei Yang
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - Wenjun Chen
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - Rongliang Yang
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - Anqi Chen
- College of Innovation and Entrepreneurship, Southern University of Science and Technology, Shenzhen 518055, China
| | - Hao Zhang
- Instrumental Analysis and Research Center (IARC), Sun Yat-sen University, Guangzhou 510275, China
| | - Yibo Sun
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - Yufei Jia
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - Xinming Li
- Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006 China
| | - Zikang Tang
- Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa 999078, Macau, China
| | - Xuchun Gui
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
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11
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Jain A, Szabó Á, Parzefall M, Bonvin E, Taniguchi T, Watanabe K, Bharadwaj P, Luisier M, Novotny L. One-Dimensional Edge Contacts to a Monolayer Semiconductor. NANO LETTERS 2019; 19:6914-6923. [PMID: 31513426 DOI: 10.1021/acs.nanolett.9b02166] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Integration of electrical contacts into van der Waals (vdW) heterostructures is critical for realizing electronic and optoelectronic functionalities. However, to date no scalable methodology for gaining electrical access to buried monolayer two-dimensional (2D) semiconductors exists. Here we report viable edge contact formation to hexagonal boron nitride (hBN) encapsulated monolayer MoS2. By combining reactive ion etching, in situ Ar+ sputtering and annealing, we achieve a relatively low edge contact resistance, high mobility (up to ∼30 cm2 V-1 s-1) and high on-current density (>50 μA/μm at VDS = 3V), comparable to top contacts. Furthermore, the atomically smooth hBN environment also preserves the intrinsic MoS2 channel quality during fabrication, leading to a steep subthreshold swing of 116 mV/dec with a negligible hysteresis. Hence, edge contacts are highly promising for large-scale practical implementation of encapsulated heterostructure devices, especially those involving air sensitive materials, and can be arbitrarily narrow, which opens the door to further shrinkage of 2D device footprint.
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Affiliation(s)
- Achint Jain
- Photonics Laboratory , ETH Zürich , 8093 Zürich , Switzerland
| | - Áron Szabó
- Integrated Systems Laboratory , ETH Zürich , 8092 Zürich , Switzerland
| | | | - Eric Bonvin
- Photonics Laboratory , ETH Zürich , 8093 Zürich , Switzerland
| | - Takashi Taniguchi
- National Institute for Material Science , 1-1 Namiki , Tsukuba 305-0044 , Japan
| | - Kenji Watanabe
- National Institute for Material Science , 1-1 Namiki , Tsukuba 305-0044 , Japan
| | - Palash Bharadwaj
- Department of Electrical and Computer Engineering , Rice University , Houston , Texas 77005 , United States
| | - Mathieu Luisier
- Integrated Systems Laboratory , ETH Zürich , 8092 Zürich , Switzerland
| | - Lukas Novotny
- Photonics Laboratory , ETH Zürich , 8093 Zürich , Switzerland
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12
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Wu Y, Wang H, Tu W, Wu S, Chew JW. Construction of hole-transported MoO3-x
coupled with CdS nanospheres for boosting photocatalytic performance via oxygen-defects-mediated Z-scheme charge transfer. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.4780] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Yan Wu
- School of Chemical and Biomedical Engineering; Nanyang Technological University; Singapore 637459 Singapore
| | - Hou Wang
- School of Chemical and Biomedical Engineering; Nanyang Technological University; Singapore 637459 Singapore
| | - Wenguang Tu
- School of Chemical and Biomedical Engineering; Nanyang Technological University; Singapore 637459 Singapore
| | - Shuyang Wu
- School of Chemical and Biomedical Engineering; Nanyang Technological University; Singapore 637459 Singapore
| | - Jia Wei Chew
- School of Chemical and Biomedical Engineering; Nanyang Technological University; Singapore 637459 Singapore
- Singapore Membrane Technology Center, Nanyang Environment and Water Research Institute; Nanyang Technological University; Singapore 639798 Singapore
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13
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Wang YY, Deng JJ, Wang X, Che JT, Ding XL. Small stoichiometric (MoS2)n clusters with the 1T phase. Phys Chem Chem Phys 2018; 20:6365-6373. [DOI: 10.1039/c7cp07914a] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Stoichiometric (MoS2)n clusters (n = 1–6) were systematically studied by density functional theory calculations with hybrid B3LYP and pure GGA PW91 functionals.
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Affiliation(s)
- Ya-Ya Wang
- Department of Mathematics and Physics
- North China Electric Power University
- Beijing
- P. R. China
| | - Jia-Jun Deng
- Department of Mathematics and Physics
- North China Electric Power University
- Beijing
- P. R. China
| | - Xin Wang
- Department of Mathematics and Physics
- North China Electric Power University
- Beijing
- P. R. China
| | - Jian-Tao Che
- Department of Mathematics and Physics
- North China Electric Power University
- Beijing
- P. R. China
| | - Xun-Lei Ding
- Department of Mathematics and Physics
- North China Electric Power University
- Beijing
- P. R. China
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14
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KC S, Longo RC, Wallace RM, Cho K. Computational Study of MoS 2/HfO 2 Defective Interfaces for Nanometer-Scale Electronics. ACS OMEGA 2017; 2:2827-2834. [PMID: 31457620 PMCID: PMC6641027 DOI: 10.1021/acsomega.7b00636] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Accepted: 06/01/2017] [Indexed: 05/30/2023]
Abstract
Atomic structures and electronic properties of MoS2/HfO2 defective interfaces are investigated extensively for future field-effect transistor device applications. To mimic the atomic layer deposition growth under ambient conditions, the impact of interfacial oxygen concentration on the MoS2/HfO2 interface electronic structure is examined. Then, the effect on band offsets (BOs) and the thermodynamic stability of those interfaces is investigated and compared with available relevant experimental data. Our results show that the BOs can be modified up to 2 eV by tuning the oxygen content through, for example, the relative partial pressure. Interfaces with hydrogen impurities as well as various structural disorders were also considered, leading to different behaviors, such as n-type doping, or introducing defect states close to the Fermi level because of the formation of hydroxyl groups. Then, our results indicate that for a well-prepared interface the electronic device performance should be better than that of other interfaces, such as III-V/high-κ, because of the absence of interface defect states. However, any unpassivated defects, if present during oxide growth, strongly affect the subsequent electronic properties of the interface. The unique electronic properties of monolayer-to-few-layered transition-metal dichalcogenides and dielectric interfaces are described in detail for the first time, showing the promising interfacial characteristics for future transistor technology.
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Affiliation(s)
- Santosh KC
- Department
of Materials Science & Engineering, The University of Texas at Dallas, 800 W. Campbell Road, Richardson, Texas 75080, United
States
- Materials
Science and Technology Division, Oak Ridge
National Lab, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831, United States
| | - Roberto C. Longo
- Department
of Materials Science & Engineering, The University of Texas at Dallas, 800 W. Campbell Road, Richardson, Texas 75080, United
States
| | - Robert M. Wallace
- Department
of Materials Science & Engineering, The University of Texas at Dallas, 800 W. Campbell Road, Richardson, Texas 75080, United
States
| | - Kyeongjae Cho
- Department
of Materials Science & Engineering, The University of Texas at Dallas, 800 W. Campbell Road, Richardson, Texas 75080, United
States
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15
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Yang Z, Pan J, Liu Q, Wu N, Hu M, Ouyang F. Electronic structures and transport properties of a MoS2–NbS2 nanoribbon lateral heterostructure. Phys Chem Chem Phys 2017; 19:1303-1310. [DOI: 10.1039/c6cp07327a] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
A theoretical study on a transition metal dichalcogenide one-dimensional nanoribbon lateral heterostructure for nanoelectronics with low energy consumption.
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Affiliation(s)
- Zhixiong Yang
- Powder Metallurgy Research Institute and State Key Laboratory of Powder Metallurgy
- Central South University
- Changsha 410083
- People's Republic of China
| | - Jiangling Pan
- School of Physics and Electronics
- and Institute of Super-microstructure and Ultrafast Processing Advanced Materials
- Central South University
- Changsha 410083
- People's Republic of China
| | - Qi Liu
- School of Physics and Electronics
- and Institute of Super-microstructure and Ultrafast Processing Advanced Materials
- Central South University
- Changsha 410083
- People's Republic of China
| | - Nannan Wu
- School of Physics and Electronics
- and Institute of Super-microstructure and Ultrafast Processing Advanced Materials
- Central South University
- Changsha 410083
- People's Republic of China
| | - Mengli Hu
- School of Physics and Electronics
- and Institute of Super-microstructure and Ultrafast Processing Advanced Materials
- Central South University
- Changsha 410083
- People's Republic of China
| | - Fangping Ouyang
- Powder Metallurgy Research Institute and State Key Laboratory of Powder Metallurgy
- Central South University
- Changsha 410083
- People's Republic of China
- School of Physics and Electronics
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