scholarly journals Anomalous fracture in two-dimensional rhenium disulfide

2020 ◽  
Vol 6 (47) ◽  
pp. eabc2282
Author(s):  
Lingli Huang ◽  
Fangyuan Zheng ◽  
Qingming Deng ◽  
Quoc Huy Thi ◽  
Lok Wing Wong ◽  
...  
Keyword(s):  
Rational Design ◽  
Atomic Scale ◽  
Two Dimensional ◽  
Brittle Crack ◽  
Transmission Electron ◽  
Additional Strain ◽  
Crack Tips ◽  
Low Dimensional ◽  
Low Dimensional Materials ◽  
Fracture Processes

Low-dimensional materials usually exhibit mechanical properties from those of their bulk counterparts. Here, we show in two-dimensional (2D) rhenium disulfide (ReS2) that the fracture processes are dominated by a variety of previously unidentified phenomena, which are not present in bulk materials. Through direct transmission electron microscopy observations at the atomic scale, the structures close to the brittle crack tip zones are clearly revealed. Notably, the lattice reconstructions initiated at the postcrack edges can impose additional strain on the crack tips, modifying the fracture toughness of this material. Moreover, the monatomic thickness allows the restacking of postcrack edges in the shear strain–dominated cracks, which is potentially useful for the rational design of 2D stacking contacts in atomic width. Our studies provide critical insights into the atomistic processes of fracture and unveil the origin of the brittleness in the 2D materials.

Atomistic and dynamic structural characterizations in low-dimensional materials: recent applications of in situ transmission electron microscopy

Microscopy ◽  
2019 ◽  
Author(s):  
He Zheng ◽  
Fan Cao ◽  
Ligong Zhao ◽  
Renhui Jiang ◽  
Peili Zhao ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Atomic Scale ◽  
Transmission Electron ◽  
Indispensable Tool ◽  
And Performance ◽  
Low Dimensional ◽  
Low Dimensional Materials

Abstract In situ transmission electron microscopy has achieved remarkable advances for atomic-scale dynamic analysis in low-dimensional materials and become an indispensable tool in view of linking a material’s microstructure to its properties and performance. Here, accompanied with some cutting-edge researches worldwide, we briefly review our recent progress in dynamic atomistic characterization of low-dimensional materials under external mechanical stress, thermal excitations and electrical field. The electron beam irradiation effects in metals and metal oxides are also discussed. We conclude by discussing the likely future developments in this area.

Size-dependent strain in fivefold twins of gold

2021 ◽  
Vol 77 (1) ◽  
pp. 93-98
Author(s):  
Hao Wu ◽  
Rong Yu ◽  
Jing Zhu ◽  
Wei Chen ◽  
Yadong Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
First Principles ◽  
First Principles Calculations ◽  
Geometrical Constraint ◽  
Size Dependent ◽  
Transmission Electron ◽  
Dependent Strain ◽  
Low Dimensional ◽  
Low Dimensional Materials ◽  
Aberration Corrected

Multiple twinned structures are common in low-dimensional materials. They are intrinsically strained due to the geometrical constraint imposed by the non-crystallographic fivefold symmetry. In this study, the strain distributions in sub-10 nm fivefold twins of gold have been analyzed by combining aberration-corrected transmission electron microscopy and first-principles calculations. Bending of atomic planes has been measured by both experiments and calculations, and its contribution to the filling of the angular gap was shown to be size-dependent.

Recent advances in two-dimensional-material-based sensing technology toward health and environmental monitoring applications

Nanoscale ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 3535-3559 ◽  
Author(s):  
Deepika Tyagi ◽  
Huide Wang ◽  
Weichun Huang ◽  
Lanping Hu ◽  
Yanfeng Tang ◽  
...  
Keyword(s):  
Environmental Monitoring ◽  
Human Body ◽  
Two Dimensional ◽  
Detection Strategy ◽  
Recent Advances ◽  
Sensing Technology ◽  
Monitoring Applications ◽  
Low Dimensional ◽  
Low Dimensional Materials

Low dimensional materials based sensors have improved the detection strategy for sensing complex substances present in environment and human body.

scholarly journals Processing and characterisation of two-dimensional nanostructures

2014 ◽  
Vol 70 (a1) ◽  
pp. C510-C510
Author(s):  
Valeria Nicolosi
Keyword(s):  
Electron Microscopy ◽  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Atomic Scale ◽  
Metal Chalcogenides ◽  
Two Dimensional ◽  
Wide Range ◽  
Electron Microscopes ◽  
Low Dimensional ◽  
Aberration Corrected

Low-dimensional nanostructured materials such as organic and inorganic nanotubes, nanowires and platelets are potentially useful in a number of areas of nanoscience and nanotechnology due to their remarkable mechanical, electrical and thermal properties. However difficulties associated with their lack of processability have seriously hampered both. In the last few years dispersion and exfoliation methods have been developed and demonstrated to apply universally to 1D and 2D nanostructures of very diverse nature, offering a practical means of processing the nanostructures for a wide range of innovative technologies. Among the first materials to have benefitted most from these advances are carbon nanotubes [6] and more recently graphene. Recently this work has been extended to boron nitride and a wide range of two-dimensional transition metal chalcogenides. These are potentially important because they occur in >40 different types with a wide range of electronic properties, varying from metallic to semiconducting. To make real applications truly feasible, however, it is crucial to fully characterize the nanostructures on the atomic scale and correlate this information with their physical and chemical properties. Advances in aberration-corrected optics in electron microscopy have revolutionised the way to characterise nano-materials, opening new frontiers for materials science. With the recent advances in nanostructure processability, electron microscopes are now revealing the structure of the individual components of nanomaterials, atom by atom. Here we will present an overview of very different low-dimensional materials issues, showing what aberration-corrected electron microscopy can do to answer materials scientists' questions. Particular emphasis will be given to the investigation of hexagonal boron nitride (hBN), molybdenum disulfide (MoS2), and tungsten disulfide (WS2) and the study of their structure, defects, stacking sequence, vacancies and low-atomic number individual adatoms. The analyses of the h-BN data showed that majority of nanosheets retain bulk stacking. However several of the images displayed stacking different from the bulk. Similar, to 2D h-BN, images of MoS2 and WS2 have shown the stacking previously unobserved in the bulk. This novel stacking consists of Mo/W stacked on the top each other in the consecutive layers.

Mechanisms of high-Tc superconductivity in low-dimensional materials

1987 ◽  
Vol 2 (6) ◽  
pp. 793-799 ◽  
Author(s):  
Vladimir Z. Kresin
Keyword(s):  
Proximity Effect ◽  
Coherence Length ◽  
Two Dimensional ◽  
Phonon Coupling ◽  
Strong Electron ◽  
High Tc ◽  
Electron Phonon Coupling ◽  
Low Dimensionality ◽  
Low Dimensional ◽  
Low Dimensional Materials

High-Tc superconductivity is due to the action of two mechanisms: (1) plasmon mechanism, i.e., exchange of two-dimensional (2-D) plasmons and (2) strong electron-phonon coupling. The low dimensionality and the small value of the carrier concentration make the plasmon mechanism favorable. The small value of the coherence length leads to a unique opportunity to observe a multigap structure. The proximity effect can be used in order to increase Tc of A-15 compounds.

scholarly journals Materials nanoarchitectonics at two-dimensional liquid interfaces

2019 ◽  
Vol 10 ◽  
pp. 1559-1587 ◽  
Author(s):  
Katsuhiko Ariga ◽  
Michio Matsumoto ◽  
Taizo Mori ◽  
Lok Kumar Shrestha
Keyword(s):  
Metal Organic Frameworks ◽  
Layer By Layer ◽  
Two Dimensional ◽  
Covalent Organic Frameworks ◽  
Liquid Interfaces ◽  
Langmuir Blodgett ◽  
Enzyme Reactors ◽  
Metal Organic ◽  
Low Dimensional ◽  
Low Dimensional Materials

Much attention has been paid to the synthesis of low-dimensional materials from small units such as functional molecules. Bottom-up approaches to create new low-dimensional materials with various functional units can be realized with the emerging concept of nanoarchitectonics. In this review article, we overview recent research progresses on materials nanoarchitectonics at two-dimensional liquid interfaces, which are dimensionally restricted media with some freedoms of molecular motion. Specific characteristics of molecular interactions and functions at liquid interfaces are briefly explained in the first parts. The following sections overview several topics on materials nanoarchitectonics at liquid interfaces, such as the preparation of two-dimensional metal-organic frameworks and covalent organic frameworks, and the fabrication of low-dimensional and specifically structured nanocarbons and their assemblies at liquid–liquid interfaces. Finally, interfacial nanoarchitectonics of biomaterials including the regulation of orientation and differentiation of living cells are explained. In the recent examples described in this review, various materials such as molecular machines, molecular receptors, block-copolymer, DNA origami, nanocarbon, phages, and stem cells were assembled at liquid interfaces by using various useful techniques. This review overviews techniques such as conventional Langmuir–Blodgett method, vortex Langmuir–Blodgett method, liquid–liquid interfacial precipitation, instructed assembly, and layer-by-layer assembly to give low-dimensional materials including nanowires, nanowhiskers, nanosheets, cubic objects, molecular patterns, supramolecular polymers, metal-organic frameworks and covalent organic frameworks. The nanoarchitecture materials can be used for various applications such as molecular recognition, sensors, photodetectors, supercapacitors, supramolecular differentiation, enzyme reactors, cell differentiation control, and hemodialysis.

Temperature gradient-driven motion and assembly of two-dimensional (2D) materials on the liquid surface: a theoretical framework and molecular dynamics simulation

2020 ◽  
Vol 22 (41) ◽  
pp. 24097-24108
Author(s):  
Yongshuai Wen ◽  
Qingchang Liu ◽  
Yongshou Liu
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Temperature Gradient ◽  
Conceptual Design ◽  
Liquid Surface ◽  
2D Materials ◽  
Dynamics Simulation ◽  
Two Dimensional ◽  
Low Dimensional ◽  
Low Dimensional Materials

A conceptual design of driving 2D or other low-dimensional materials on the liquid surface with a temperature gradient.

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