Incorporation of Low-dimensional Materials into the Two-dimensional Interlamellar Nanospace of a Pillared Interlayered Solid

2001 ◽  
Vol 13 (2) ◽  
pp. 704-710 ◽  
Author(s):  
Kunio Ohtsuka ◽  
Yoshimasa Hayashi
Keyword(s):  
Two Dimensional ◽  
Low Dimensional ◽  
Low Dimensional Materials

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.

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.

Confinement Effect in Thermoelectric Properties of Two-Dimensional Materials

MRS Advances ◽  
2020 ◽  
Vol 5 (10) ◽  
pp. 469-479 ◽  
Author(s):  
Nguyen T. Hung ◽  
Ahmad R. T. Nugraha ◽  
Teng Yang ◽  
Riichiro Saito
Keyword(s):  
2D Materials ◽  
Quantum Effect ◽  
Electrical Energy ◽  
Confinement Effect ◽  
Fundamental Aspect ◽  
Two Dimensional ◽  
Low Dimensions ◽  
Low Dimensional ◽  
De Broglie Wavelength ◽  
Low Dimensional Materials

ABSTRACT:Thermoelectric (TE) materials, or materials that can generate an electrical energy from temperature gradient, are promising for renewable energy technology. One fundamental aspect in the TE research is the demand to maximize the TE power-factor, PF = S2 σ, by having as large Seebeck coefficient (S) and electrical conductivity (σ) as possible. In the early 90s, Hicks and Dresselhaus proposed the PF enhancement by using low-dimensional materials, in which electrons are confined in certain directions and they move freely in the other directions. This quantum effect is known as the confinement length (L) effect, in which L is the thickness or diameter of the two-dimensional (2D) or one-dimensional materials, respectively. However, a key challenge is to understand the critical value of L, at which the PF can be significantly enhanced. Recently, we reevaluated the confinement theory of the low-dimensional materials to solve this issue. We showed that electrons are fully confined only when L is smaller than an intrinsic length Λ, the so-called thermal de Broglie wavelength, which depends on the materials and can be experimentally measured. Monolayer 2D materials naturally satisfy the condition of L < Λ since their confinement length is ∼ 1 nm, while their thermal de Broglie wavelength is ∼ 5-10 nm. Therefore, they could be a good candidate for TE materials. In this review article, we first review the TE materials with low dimensions. Then, we show the basic concept of the confinement effect and the consequence of such an effect. Finally, based on this effect, we turn our attention to the progress achieved recently in the TE properties of the 2D materials such as monolayer InSe, GaN electron gas, and SrTiO3 superlattices.

Strain-tunable electric structure and magnetic anisotropy in monolayer CrSI

2019 ◽  
Vol 21 (37) ◽  
pp. 20892-20900 ◽  
Author(s):  
Ruilin Han ◽  
Yu Yan
Keyword(s):  
Magnetic Anisotropy ◽  
Ferromagnetic Semiconductors ◽  
Two Dimensional ◽  
Electric Structure ◽  
Low Dimensional ◽  
Physical Phenomena ◽  
Low Dimensional Materials

Two-dimensional (2D) ferromagnetic semiconductors provide platforms for studying novel physical phenomena in low dimensional materials.

scholarly journals Current-driven magnetization switching in a van der Waals ferromagnet Fe3GeTe2

2019 ◽  
Vol 5 (8) ◽  
pp. eaaw8904 ◽  
Author(s):  
Xiao Wang ◽  
Jian Tang ◽  
Xiuxin Xia ◽  
Congli He ◽  
Junwei Zhang ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Van Der Waals ◽  
The Other ◽  
Bilayer Structure ◽  
Spin Orbit ◽  
Two Dimensional ◽  
Magnetization Switching ◽  
Spintronic Devices ◽  
Low Dimensional ◽  
Low Dimensional Materials

The recent discovery of ferromagnetism in two-dimensional (2D) van der Waals (vdW) materials holds promises for spintronic devices with exceptional properties. However, to use 2D vdW magnets for building spintronic nanodevices such as magnetic memories, key challenges remain in terms of effectively switching the magnetization from one state to the other electrically. Here, we devise a bilayer structure of Fe3GeTe2/Pt, in which the magnetization of few-layered Fe3GeTe2 can be effectively switched by the spin-orbit torques (SOTs) originated from the current flowing in the Pt layer. The effective magnetic fields corresponding to the SOTs are further quantitatively characterized using harmonic measurements. Our demonstration of the SOT-driven magnetization switching in a 2D vdW magnet could pave the way for implementing low-dimensional materials in the next-generation spintronic applications.

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.

Electronic properties of quasi two-dimensional transition metals chalcogenides with low-dimensional magnetism

Doklady BGUIR ◽  
2020 ◽  
Vol 18 (7) ◽  
pp. 87-95
Author(s):  
M. S. Baranava ◽  
P. A. Praskurava
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Exchange Interaction ◽  
Electronic Properties ◽  
Metal Atom ◽  
Transition Metal Atom ◽  
Two Dimensional ◽  
Transition Metal Atoms ◽  
Ground Magnetic ◽  
Low Dimensional

The search for fundamental physical laws which lead to stable high-temperature ferromagnetism is an urgent task. In addition to the already synthesized two-dimensional materials, there remains a wide list of possible structures, the stability of which is predicted theoretically. The article suggests the results of studying the electronic properties of MAX3 (M = Cr, Fe, A = Ge, Si, X = S, Se, Te) transition metals based compounds with nanostructured magnetism. The research was carried out using quantum mechanical simulation in specialized VASP software and calculations within the Heisenberg model. The ground magnetic states of twodimensional MAX3 and the corresponding energy band structures are determined. We found that among the systems under study, CrGeTe3 is a semiconductor nanosized ferromagnet. In addition, one is a semiconductor with a bandgap of 0.35 eV. Other materials are antiferromagnetic. The magnetic moment in MAX3 is localized on the transition metal atoms: in particular, the main one on the d-orbital of the transition metal atom (and only a small part on the p-orbital of the chalcogen). For CrGeTe3, the exchange interaction integral is calculated. The mechanisms of the formation of magnetic order was established. According to the obtained exchange interaction integrals, a strong ferromagnetic order is formed in the semiconductor plane. The distribution of the projection density of electronic states indicates hybridization between the d-orbital of the transition metal atom and the p-orbital of the chalcogen. The study revealed that the exchange interaction by the mechanism of superexchange is more probabilistic.

scholarly journals The Highly Uniform Photoresponsivity from Visible to Near IR Light in Sb2Te3 Flakes

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1535
Author(s):  
Shiu-Ming Huang ◽  
Jai-Lung Hung ◽  
Mitch Chou ◽  
Chi-Yang Chen ◽  
Fang-Chen Liu ◽  
...  
Keyword(s):  
Band Structure ◽  
Energy Difference ◽  
Experimental Result ◽  
Light Illumination ◽  
Near Ir ◽  
State Band ◽  
Valence Bands ◽  
Low Dimensional ◽  
Low Dimensional Materials ◽  
Ir Light

Broadband photosensors have been widely studied in various kinds of materials. Experimental results have revealed strong wavelength-dependent photoresponses in all previous reports. This limits the potential application of broadband photosensors. Therefore, finding a wavelength-insensitive photosensor is imperative in this application. Photocurrent measurements were performed in Sb2Te3 flakes at various wavelengths ranging from visible to near IR light. The measured photocurrent change was insensitive to wavelengths from 300 to 1000 nm. The observed wavelength response deviation was lower than that in all previous reports. Our results show that the corresponding energies of these photocurrent peaks are consistent with the energy difference of the density of state peaks between conduction and valence bands. This suggests that the observed photocurrent originates from these band structure peak transitions under light illumination. Contrary to the most common explanation that observed broadband photocurrent carrier is mainly from the surface state in low-dimensional materials, our experimental result suggests that bulk state band structure is the main source of the observed photocurrent and dominates the broadband photocurrent.

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