Interaction of gases with monolayer WS2: An In Situ Spectroscopy Study

Nanoscale ◽  
2021 ◽  
Author(s):  
Rahul Rao ◽  
Hyunil Kim ◽  
Nestor Perea Lopez ◽  
Mauricio Terrones ◽  
Benji Maruyama
Keyword(s):  
2D Materials ◽  
Chemical Adsorption ◽  
In Situ Spectroscopy ◽  
Two Dimensional ◽  
Spectroscopy Study ◽  
Sensor Platforms ◽  
Optical And Electronic Properties ◽  
Adsorption Of Gases ◽  
Physical And Chemical

The optical and electronic properties of two-dimensional (2D) materials can be tuned through physical and chemical adsorption of gases. They are also ideal sensor platforms, where charge transfer from the...

Design of 2D materials – MSi2CxN4-x (M = Cr, Mo, and W; x = 1 and 2) - with tunable electronic and magnetic properties

Nanoscale ◽  
2021 ◽  
Author(s):  
Bowen Li ◽  
Jiazhong Geng ◽  
Haoqiang Ai ◽  
youchao Kong ◽  
Haoyun Bai ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
2D Materials ◽  
Chemical Properties ◽  
First Principle ◽  
Physical And Chemical Properties ◽  
Two Dimensional ◽  
Electronic And Magnetic Properties ◽  
The Past ◽  
Physical And Chemical ◽  
And Chemical Properties

Two-dimensional (2D) materials have attracted increasing interest in the past decades due to their unique physical and chemical properties for diverse applications. In this work, we present a first-principle design...

Preparation and the Photoluminescence Properties of Er3+-Doped MoS2 Thin Films

2017 ◽  
Vol 898 ◽  
pp. 1824-1828
Author(s):  
Miao Fei Meng ◽  
Xi Ying Ma
Keyword(s):  
Thin Films ◽  
Doping Concentration ◽  
2D Materials ◽  
Sol Gel ◽  
Photoluminescence Intensity ◽  
Two Dimensional ◽  
Photoluminescence Properties ◽  
Optical And Electronic Properties ◽  
Quartz Substrates ◽  
Surface Morphologies

Molybdenum disulfide (MoS2) thin films, layered quasi-two dimensional (2D) materials, have excellent optical and electronic properties for its special structure. In this paper, the surface morphologies, crystals structures and optical characteristics of MoS2 and Er3+-doped MoS2 (Er: MoS2) thin film samples fabricated on the quartz substrates by sol-gel method were investigated. The result indicated that annealing made the crystallinity and optical absorption characteristics of MoS2 thin films better. The light absorption and photoluminescence intensity was enhanced by doping Er3+. Moreover, the photoluminescence intensity increased with increasing doping concentration, but appears saturation tendency.

scholarly journals An In Situ Reflectance Spectroscopic Investigation to Monitor Two-Dimensional MoS2 Flakes on a Sapphire Substrate

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5794
Author(s):  
Yina Wang ◽  
Lei Zhang ◽  
Wen Yang ◽  
Shanshan Lv ◽  
Chenhui Su ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
2D Materials ◽  
Chemical Vapor ◽  
Reflectance Spectroscopy ◽  
In Situ Monitoring ◽  
Structure Evolution ◽  
Two Dimensional ◽  
Characteristic Peak ◽  
Non Destructive

In this work, we demonstrate the application of differential reflectance spectroscopy (DRS) to monitor the growth of molybdenum disulfide (MoS2) using chemical vapor deposition (CVD). The growth process, optical properties, and structure evolution of MoS2 were recorded by in-situ DRS. Indeed, blue shifts of the characteristic peak B were discussed with the decrease of temperature. We also obtained the imaginary part of the MoS2 dielectric constant according to reflectance spectra. This method provides an approach for studying the change of two-dimensional (2D) materials’ dielectric constant with temperature. More importantly, our work emphasizes that the DRS technique is a non-destructive and effective method for in-situ monitoring the growth of 2D materials, which is helpful in guiding the preparation of 2D materials.

scholarly journals Recent Progress of Two-Dimensional Materials for Ultrafast Photonics

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1778
Author(s):  
Aojie Zhang ◽  
Zihao Wang ◽  
Hao Ouyang ◽  
Wenhao Lyu ◽  
Jingxuan Sun ◽  
...  
Keyword(s):  
Ultrafast Lasers ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Chemical Properties ◽  
Two Dimensional ◽  
Saturable Absorbers ◽  
Output Performance ◽  
Metal Dichalcogenides ◽  
Ultrafast Photonics ◽  
Physical And Chemical

Owing to their extraordinary physical and chemical properties, two-dimensional (2D) materials have aroused extensive attention and have been widely used in photonic and optoelectronic devices, catalytic reactions, and biomedicine. In particular, 2D materials possess a unique bandgap structure and nonlinear optical properties, which can be used as saturable absorbers in ultrafast lasers. Here, we mainly review the top-down and bottom-up methods for preparing 2D materials, such as graphene, topological insulators, transition metal dichalcogenides, black phosphorus, and MXenes. Then, we focus on the ultrafast applications of 2D materials at the typical operating wavelengths of 1, 1.5, 2, and 3 μm. The key parameters and output performance of ultrafast pulsed lasers based on 2D materials are discussed. Furthermore, an outlook regarding the fabrication methods and the development of 2D materials in ultrafast photonics is also presented.

scholarly journals MXenes: focus on optical and electronic properties and corresponding applications

Nanophotonics ◽  
2020 ◽  
Vol 9 (7) ◽  
pp. 1601-1620
Author(s):  
Yifan Wang ◽  
Yanheng Xu ◽  
Menglei Hu ◽  
Han Ling ◽  
Xi Zhu
Keyword(s):  
Energy Storage ◽  
Transition Metal ◽  
Electronic Properties ◽  
Gas Separation ◽  
2D Materials ◽  
Two Dimensional ◽  
Metal Carbides ◽  
Research Groups ◽  
Transition Metal Carbides ◽  
Optical And Electronic Properties

AbstractThe discovery of graphene, the first two-dimensional (2D) material, has caused an upsurge, as this kind of material revealed a tremendous potential of application in areas such as energy storage, electronics, and gas separation. MXenes are referred to as a family of 2D transition metal carbides, carbonitrides, and nitrides. After the synthesis of Ti3C2 from Ti3AlC2 in 2011, about 30 new compositions have been reported. These materials have been widely discussed, synthesized, and investigated by many research groups, as they have many advantages over traditional 2D materials. This review covers the structures of MXenes, discusses various synthesis routines, analyzes the properties, especially optical and electronic properties, and summarizes their applications and potential, which may give readers an overview of these popular materials.

Tuning two-dimensional nanomaterials by intercalation: materials, properties and applications

2016 ◽  
Vol 45 (24) ◽  
pp. 6742-6765 ◽  
Author(s):  
Jiayu Wan ◽  
Steven D. Lacey ◽  
Jiaqi Dai ◽  
Wenzhong Bao ◽  
Michael S. Fuhrer ◽  
...  
Keyword(s):  
2D Materials ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Two Dimensional ◽  
Materials Properties ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Intercalation Materials

2D materials have attracted tremendous attention due to their unique physical and chemical properties since the discovery of graphene. Among all modification methods, intercalation has emerged as a unique and powerful tool to further tune the properties of these atomically thin materials.

scholarly journals In situ manipulation of van der Waals heterostructures for twistronics

2020 ◽  
Vol 6 (49) ◽  
pp. eabd3655
Author(s):  
Yaping Yang ◽  
Jidong Li ◽  
Jun Yin ◽  
Shuigang Xu ◽  
Ciaran Mullan ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
2D Materials ◽  
Twist Angle ◽  
Van Der Waals ◽  
Two Dimensional ◽  
Van Der Waals Heterostructures ◽  
Material Systems ◽  
Nontrivial Topology

In van der Waals heterostructures, electronic bands of two-dimensional (2D) materials, their nontrivial topology, and electron-electron interactions can be markedly changed by a moiré pattern induced by twist angles between different layers. This process is referred to as twistronics, where the tuning of twist angle can be realized through mechanical manipulation of 2D materials. Here, we demonstrate an experimental technique that can achieve in situ dynamical rotation and manipulation of 2D materials in van der Waals heterostructures. Using this technique, we fabricated heterostructures where graphene is perfectly aligned with both top and bottom encapsulating layers of hexagonal boron nitride. Our technique enables twisted 2D material systems in one single stack with dynamically tunable optical, mechanical, and electronic properties.

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