scholarly journals Structural Defects, Mechanical Behaviors, and Properties of Two-Dimensional Materials

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1192
Author(s):  
Zixin Xiong ◽  
Lei Zhong ◽  
Haotian Wang ◽  
Xiaoyan Li
Keyword(s):  
2D Materials ◽  
Structural Defects ◽  
Monolayer Graphene ◽  
Fracture Mechanisms ◽  
Two Dimensional ◽  
Mechanical Behaviors ◽  
Defect Engineering ◽  
Practical Applications ◽  
Atomic Structures ◽  
Deformation And Fracture

Since the success of monolayer graphene exfoliation, two-dimensional (2D) materials have been extensively studied due to their unique structures and unprecedented properties. Among these fascinating studies, the most predominant focus has been on their atomic structures, defects, and mechanical behaviors and properties, which serve as the basis for the practical applications of 2D materials. In this review, we first highlight the atomic structures of various 2D materials and the structural and energy features of some common defects. We then summarize the recent advances made in experimental, computational, and theoretical studies on the mechanical properties and behaviors of 2D materials. We mainly emphasized the underlying deformation and fracture mechanisms and the influences of various defects on mechanical behaviors and properties, which boost the emergence and development of topological design and defect engineering. We also further introduce the piezoelectric and flexoelectric behaviors of specific 2D materials to address the coupling between mechanical and electronic properties in 2D materials and the interactions between 2D crystals and substrates or between different 2D monolayers in heterostructures. Finally, we provide a perspective and outlook for future studies on the mechanical behaviors and properties of 2D materials.

Impact of structure, doping and defect- engineering in 2D materials for CO2 capture and conversion

2021 ◽  
Author(s):  
E. J. Jelmy ◽  
Nishanth Thomas ◽  
Dhanu Treasa Mathew ◽  
Jesna Louis ◽  
Nisha T Padmanabhan ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Co2 Capture ◽  
2D Materials ◽  
Vital Role ◽  
Energy Crisis ◽  
Two Dimensional ◽  
Defect Engineering ◽  
Anthropogenic Carbon ◽  
2D Nanomaterials ◽  
Carbon Dioxide Co2

The investigations on anthropogenic carbon dioxide (CO2) capture and conversion have a vital role in eradicating the global warming and energy crisis. In this context, defect- engineered two-dimensional (2D) nanomaterials...

scholarly journals Energy loss by fast-travelling charged particles traversing two-dimensional materials

2020 ◽  
Vol 233 ◽  
pp. 03005
Author(s):  
Jaime E. Santos ◽  
Mikhail Vasilevskiy ◽  
Nuno M.R. Peres ◽  
Antti-Pekka Jauho
Keyword(s):  
Thin Films ◽  
Energy Loss ◽  
2D Materials ◽  
Charged Particles ◽  
Monolayer Graphene ◽  
Two Dimensional ◽  
Particle Detection ◽  
Hydrodynamic Approximation ◽  
Radiation Losses ◽  
Two Dimensional Materials

We consider the problem of the radiation losses by fast-traveling particles traversing two-dimensional (2d) materials or thin films. After review¬ing the screening of electromagnetic fields by two dimensional conducting ma¬terials, we obtain the energy loss by a fast particle traversing such a material or film. In particular, we discuss the pattern of radiation emitted by monolayer graphene treated within a hydrodynamic approximation. These results are com¬pared with recent published results using similar approximations and, having in mind a potential application to particle detection, we briefly discuss how one can improve on the signals obtained by using other two-dimensional materials.

scholarly journals Advances in quantum light emission from 2D materials

Nanophotonics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 2017-2032 ◽  
Author(s):  
Chitraleema Chakraborty ◽  
Nick Vamivakas ◽  
Dirk Englund
Keyword(s):  
Optical Properties ◽  
Binding Energy ◽  
Momentum Space ◽  
Recent Progress ◽  
Light Emission ◽  
2D Materials ◽  
Two Dimensional ◽  
Theoretical Understanding ◽  
Practical Applications ◽  
Spin Properties

AbstractTwo-dimensional (2D) materials are being actively researched due to their exotic electronic and optical properties, including a layer-dependent bandgap, a strong exciton binding energy, and a direct optical access to electron valley index in momentum space. Recently, it was discovered that 2D materials with bandgaps could host quantum emitters with exceptional brightness, spectral tunability, and, in some cases, also spin properties. This review considers the recent progress in the experimental and theoretical understanding of these localized defect-like emitters in a variety of 2D materials as well as the future advantages and challenges on the path toward practical applications.

scholarly journals Overview of Rational Design of Binary Alloy for the Synthesis of Two-Dimensional Materials

Surfaces ◽  
2020 ◽  
Vol 3 (1) ◽  
pp. 26-39
Author(s):  
Hongyan Zhu ◽  
Chao Zhang ◽  
Xuefu Zhang ◽  
Zhiyuan Shi ◽  
Tianru Wu ◽  
...  
Keyword(s):  
Transition Metal ◽  
Rational Design ◽  
Hexagonal Boron Nitride ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Chemical Vapor ◽  
Domain Size ◽  
Two Dimensional ◽  
Practical Applications ◽  
Metal Catalyzed

Two-dimensional (2D) materials attracted widespread interest as unique and novel properties different from their bulk crystals, providing great potential for semiconductor devices and applications. Recently, the family of 2D materials has been expanded including but not limited to graphene, hexagonal boron nitride (h-BN), transition metal carbides (TMCs), and transition metal dichalcogenides (TMDCs). Metal-catalyzed chemical vapor deposition (CVD) is an effective method to achieve precise synthesis of these 2D materials. In this review, we focus on designing various binary alloys to realize controllable synthesis of multiple CVD-grown 2D materials and their heterostructures for both fundamental research and practical applications. Further investigations indicated that the design of the catalytic substrate is an important issue, which determines the morphology, domain size, thickness and quality of 2D materials and their heterostructures.

Prediction of high-temperature Chern insulator with half-metallic edge states in asymmetry-functionalized stanene

Nanoscale ◽  
2018 ◽  
Vol 10 (43) ◽  
pp. 20226-20233 ◽  
Author(s):  
Meng-han Zhang ◽  
Chang-wen Zhang ◽  
Pei-ji Wang ◽  
Sheng-shi Li
Keyword(s):  
High Temperature ◽  
Carrier Mobility ◽  
2D Materials ◽  
High Curie Temperature ◽  
Two Dimensional ◽  
Edge States ◽  
Half Metallic ◽  
Practical Applications ◽  
High Carrier Mobility ◽  
High Carrier

A great obstacle for the practical applications of the quantum anomalous Hall (QAH) effect is the lack of suitable two-dimensional (2D) materials with a sizable nontrivial band gap, high Curie temperature, and high carrier mobility.

scholarly journals Recent Progress on Irradiation-Induced Defect Engineering of Two-Dimensional 2H-MoS2 Few Layers

2019 ◽  
Vol 9 (4) ◽  
pp. 678 ◽  
Author(s):  
Guang-Yi Zhao ◽  
Hua Deng ◽  
Nathaniel Tyree ◽  
Michael Guy ◽  
Abdellah Lisfi ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Heavy Ions ◽  
2D Materials ◽  
X Rays ◽  
Two Dimensional ◽  
Infrared Irradiation ◽  
Defect Engineering ◽  
Magnetic Performance ◽  
Particle Irradiation ◽  
Two Dimensional Materials

Atom-thick two-dimensional materials usually possess unique properties compared to their bulk counterparts. Their properties are significantly affected by defects, which could be uncontrollably introduced by irradiation. The effects of electromagnetic irradiation and particle irradiation on 2H MoS 2 two-dimensional nanolayers are reviewed in this paper, covering heavy ions, protons, electrons, gamma rays, X-rays, ultraviolet light, terahertz, and infrared irradiation. Various defects in MoS 2 layers were created by the defect engineering. Here we focus on their influence on the structural, electronic, catalytic, and magnetic performance of the 2D materials. Additionally, irradiation-induced doping is discussed and involved.

Enhancing electrocatalytic water splitting by surface defect engineering in two-dimensional electrocatalysts

Nanoscale ◽  
2020 ◽  
Author(s):  
Tong Wu ◽  
Chenlong Dong ◽  
Du Sun ◽  
Fu Qiang Huang
Keyword(s):  
Band Structure ◽  
Environmental Pollution ◽  
Water Splitting ◽  
Surface Defect ◽  
2D Materials ◽  
Energy Crisis ◽  
Hydrogen Energy ◽  
Two Dimensional ◽  
Defect Engineering ◽  
Unique Band

The electrocatalytic overall water splitting can efficiently and sustainably produce clean hydrogen energy to alleviate the global energy crisis and environmental pollution. Two-dimensional (2D) materials with unique band structure and...

scholarly journals Grain-boundary-rich polycrystalline monolayer WS2 film for attomolar-level Hg2+ sensors

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Lixuan Liu ◽  
Kun Ye ◽  
Changqing Lin ◽  
Zhiyan Jia ◽  
Tianyu Xue ◽  
...  
Keyword(s):  
Active Sites ◽  
High Performance ◽  
2D Materials ◽  
Layered Materials ◽  
High Density ◽  
Structural Defects ◽  
Defect Engineering ◽  
Ion Sensors ◽  
Sensor Performance ◽  
2D Layered Materials

AbstractEmerging two-dimensional (2D) layered materials have been attracting great attention as sensing materials for next-generation high-performance biological and chemical sensors. The sensor performance of 2D materials is strongly dependent on the structural defects as indispensable active sites for analyte adsorption. However, controllable defect engineering in 2D materials is still challenging. In the present work, we propose exploitation of controllably grown polycrystalline films of 2D layered materials with high-density grain boundaries (GBs) for design of ultra-sensitive ion sensors, where abundant structural defects on GBs act as favorable active sites for ion adsorption. As a proof-of-concept, our fabricated surface plasmon resonance sensors with GB-rich polycrystalline monolayer WS2 films have exhibited high selectivity and superior attomolar-level sensitivity in Hg2+ detection owing to high-density GBs. This work provides a promising avenue for design of ultra-sensitive sensors based on GB-rich 2D layered materials.

scholarly journals Spectroscopic investigation of defects in two-dimensional materials

Nanophotonics ◽  
2017 ◽  
Vol 6 (6) ◽  
pp. 1219-1237 ◽  
Author(s):  
Zhangting Wu ◽  
Zhenhua Ni
Keyword(s):  
Spectroscopic Investigation ◽  
Strong Influence ◽  
Recent Progress ◽  
2D Materials ◽  
Structural Defects ◽  
Defect Characterization ◽  
Spectroscopic Techniques ◽  
Two Dimensional ◽  
Two Dimensional Materials ◽  
Different Types

AbstractTwo-dimensional (2D) materials have been extensively studied in recent years due to their unique properties and great potential for applications. Different types of structural defects could present in 2D materials and have strong influence on their properties. Optical spectroscopic techniques, e.g. Raman and photoluminescence (PL) spectroscopy, have been widely used for defect characterization in 2D materials. In this review, we briefly introduce different types of defects and discuss their effects on the mechanical, electrical, optical, thermal, and magnetic properties of 2D materials. Then, we review the recent progress on Raman and PL spectroscopic investigation of defects in 2D materials, i.e. identifying of the nature of defects and also quantifying the numbers of defects. Finally, we highlight perspectives on defect characterization and engineering in 2D materials.

scholarly journals Ultrahigh thermal isolation across heterogeneously layered two-dimensional materials

2019 ◽  
Vol 5 (8) ◽  
pp. eaax1325 ◽  
Author(s):  
Sam Vaziri ◽  
Eilam Yalon ◽  
Miguel Muñoz Rojo ◽  
Saurabh V. Suryavanshi ◽  
Huairuo Zhang ◽  
...  
Keyword(s):  
Thermal Resistance ◽  
Room Temperature ◽  
2D Materials ◽  
Mass Density ◽  
Monolayer Graphene ◽  
Heterogeneous Integration ◽  
Two Dimensional ◽  
Thermal Isolation ◽  
Two Dimensional Materials ◽  
Heat Carriers

Heterogeneous integration of nanomaterials has enabled advanced electronics and photonics applications. However, similar progress has been challenging for thermal applications, in part due to shorter wavelengths of heat carriers (phonons) compared to electrons and photons. Here, we demonstrate unusually high thermal isolation across ultrathin heterostructures, achieved by layering atomically thin two-dimensional (2D) materials. We realize artificial stacks of monolayer graphene, MoS2, and WSe2 with thermal resistance greater than 100 times thicker SiO2 and effective thermal conductivity lower than air at room temperature. Using Raman thermometry, we simultaneously identify the thermal resistance between any 2D monolayers in the stack. Ultrahigh thermal isolation is achieved through the mismatch in mass density and phonon density of states between the 2D layers. These thermal metamaterials are an example in the emerging field of phononics and could find applications where ultrathin thermal insulation is desired, in thermal energy harvesting, or for routing heat in ultracompact geometries.

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