scholarly journals Raman Characterization on Two-Dimensional Materials-Based Thermoelectricity

Molecules ◽  
2018 ◽  
Vol 24 (1) ◽  
pp. 88 ◽  
Author(s):  
Zuoyuan Dong ◽  
Hejun Xu ◽  
Fang Liang ◽  
Chen Luo ◽  
Chaolun Wang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Raman Spectroscopy ◽  
2D Materials ◽  
Chemical Properties ◽  
Two Dimensional ◽  
Precise Control ◽  
Two Dimensional Materials ◽  
Physical And Chemical ◽  
Core Parameter ◽  
Raman Characterization

The emergence and development of two-dimensional (2D) materials has provided a new direction for enhancing the thermoelectric (TE) performance due to their unique structural, physical and chemical properties. However, the TE performance measurement of 2D materials is a long-standing challenge owing to the experimental difficulties of precise control in samples and high demand in apparatus. Until now, there is no universal methodology for measuring the dimensionless TE figure of merit (ZT) (the core parameter for evaluating TE performance) of 2D materials systematically in experiments. Raman spectroscopy, with its rapid and nondestructive properties for probing samples, is undoubtedly a powerful tool for characterizing 2D materials as it is known as a spectroscopic ‘Swiss-Army Knife’. Raman spectroscopy can be employed to measure the thermal conductivity of 2D materials and expected to be a systematic method in evaluating TE performance, boosting the development of thermoelectricity. In this review, thermoelectricity, 2D materials, and Raman techniques, as well as thermal conductivity measurements of 2D materials by Raman spectroscopy are introduced. The prospects of obtaining ZT and testing the TE performance of 2D materials by Raman spectroscopy in the future are also discussed.

Applications of Raman spectroscopy in two-dimensional materials

2020 ◽  
Vol 13 (05) ◽  
pp. 2030010 ◽  
Author(s):  
Pengkun Yin ◽  
Qingyu Lin ◽  
Yixiang Duan
Keyword(s):  
Raman Spectroscopy ◽  
Type Strain ◽  
2D Materials ◽  
Interlayer Coupling ◽  
Two Dimensional ◽  
Physical Chemical ◽  
Two Dimensional Materials ◽  
Application Potential ◽  
Advanced Applications ◽  
Doping Type

At present, two-dimensional (2D) materials have shown great application potential in numerous fields based on their physical chemical and electronic properties. Raman spectroscopy and derivative techniques are effective tools for characterizing 2D materials. Raman spectroscopy conveys lots of knowledge on 2D materials, including layer number, doping type, strain and interlayer coupling. This review summarized advanced applications of Raman spectroscopy in 2D materials. The challenges and possible applied directions of Raman spectroscopy to 2D materials are discussed in detail.

scholarly journals A Mini Review of the Preparation and Photocatalytic Properties of Two-Dimensional Materials

2020 ◽  
Vol 8 ◽  
Author(s):  
Shuhua Hao ◽  
Xinpei Zhao ◽  
Qiyang Cheng ◽  
Yupeng Xing ◽  
Wenxuan Ma ◽  
...  
Keyword(s):  
Active Sites ◽  
2D Materials ◽  
Chemical Properties ◽  
Metal Sulfide ◽  
Catalytic Performance ◽  
Theoretical Research ◽  
Single Atom ◽  
Preparation Methods ◽  
Two Dimensional Materials ◽  
Physical And Chemical

The successful preparation and application of graphene shows that it is feasible for the materials with a thickness of a single atom or few atomic layers to exist stably in nature. These materials can exhibit unusual physical and chemical properties due to their special dimension effects. At present, researchers have made great achievements in the preparation, characterization, modification, and theoretical research of 2D materials. Because the structure of 2D materials is often similar, it has a certain degree of qualitative versatility. Besides, 2D materials often carry good catalytic performance on account of their more active sites and adjustable harmonic electronic structure. In this review, taking 2D materials as examples [graphene, boron nitride (h-BN), transition metal sulfide and so on], we review the crystal structure and preparation methods of these materials in recent years, focus on their photocatalyst properties (carbon dioxide reduction and hydrogen production), and discuss their applications and development prospects in the future.

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...

scholarly journals A Review on Applications of Two-Dimensional Materials in Surface-Enhanced Raman Spectroscopy

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Ming Xia
Keyword(s):  
Raman Spectroscopy ◽  
2D Materials ◽  
Surface Enhanced Raman Spectroscopy ◽  
Great Promise ◽  
Two Dimensional ◽  
Raman Enhancement ◽  
Two Dimensional Materials ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Recent Developments

Two-dimensional (2D) materials, such as graphene and MoS2, have been attracting wide interest in surface enhancement Raman spectroscopy. This perspective gives an overview of recent developments in 2D materials’ application in surface-enhanced Raman spectroscopy. This review paper focuses on the applications of using bare 2D materials and metal/2D material hybrid substrate for Raman enhancement. The Raman enhancing mechanism of 2D materials will also be discussed. The progress covered herein shows great promise for widespread adoption of 2D materials in SERS application.

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.

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 Compositing Two-Dimensional Materials with TiO2 for Photocatalysis

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 590 ◽  
Author(s):  
Yu Ren ◽  
Yuze Dong ◽  
Yaqing Feng ◽  
Jialiang Xu
Keyword(s):  
High Surface ◽  
High Surface Area ◽  
Chemical Properties ◽  
Clean Energy ◽  
Two Dimensional ◽  
Preparation Methods ◽  
2D Material ◽  
Carrier Recombination ◽  
Two Dimensional Materials ◽  
Physical And Chemical

Energy shortage and environmental pollution problems boost in recent years. Photocatalytic technology is one of the most effective ways to produce clean energy—hydrogen and degrade pollutants under moderate conditions and thus attracts considerable attentions. TiO2 is considered one of the best photocatalysts because of its well-behaved photo-corrosion resistance and catalytic activity. However, the traditional TiO2 photocatalyst suffers from limitations of ineffective use of sunlight and rapid carrier recombination rate, which severely suppress its applications in photocatalysis. Surface modification and hybridization of TiO2 has been developed as an effective method to improve its photocatalysis activity. Due to superior physical and chemical properties such as high surface area, suitable bandgap, structural stability and high charge mobility, two-dimensional (2D) material is an ideal modifier composited with TiO2 to achieve enhanced photocatalysis process. In this review, we summarized the preparation methods of 2D material/TiO2 hybrid and drilled down into the role of 2D materials in photocatalysis activities.

scholarly journals Improved Charge Injection and Transport of Light-Emitting Diodes Based on Two-Dimensional Materials

2019 ◽  
Vol 9 (19) ◽  
pp. 4140 ◽  
Author(s):  
Yuanming Zhou ◽  
Sijiong Mei ◽  
Dongwei Sun ◽  
Neng Liu ◽  
Fei Mei ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Chemical Properties ◽  
Two Dimensional ◽  
Effective Electron ◽  
Light Emitting ◽  
Two Dimensional Materials ◽  
Materials Used

Light-emitting diodes (LEDs) are considered to be the most promising energy-saving technology for future lighting and display. Two-dimensional (2D) materials, a class of materials comprised of monolayer or few layers of atoms (or unit cells), have attracted much attention in recent years, due to their unique physical and chemical properties. Here, we summarize the recent advances on the applications of 2D materials for improving the performance of LEDs, including organic light emitting diodes (OLEDs), quantum dot light emitting diodes (QLEDs) and perovskite light emitting diodes (PeLEDs), using organic films, quantum dots and perovskite films as emission layers (EMLs), respectively. Two dimensional materials, including graphene and its derivatives and transition metal dichalcogenides (TMDs), can be employed as interlayers and dopant in composite functional layers for high-efficiency LEDs, suggesting the extensive application in LEDs. The functions of 2D materials used in LEDs include the improved work function, effective electron blocking, suppressed exciton quenching and reduced surface roughness. The potential application of 2D materials in PeLEDs is also presented and analyzed.

Large-area synthesis of monolayered MoS2(1−x)Se2x with a tunable band gap and its enhanced electrochemical catalytic activity

Nanoscale ◽  
2015 ◽  
Vol 7 (23) ◽  
pp. 10490-10497 ◽  
Author(s):  
Lei Yang ◽  
Qi Fu ◽  
Wenhui Wang ◽  
Jian Huang ◽  
Jianliu Huang ◽  
...  
Keyword(s):  
Band Gap ◽  
2D Materials ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Two Dimensional ◽  
Large Area ◽  
Band Gap Engineering ◽  
Physical And Chemical ◽  
Tunable Band Gap ◽  
And Chemical Properties

“Band gap engineering” in two-dimensional (2D) materials plays an important role in tailoring their physical and chemical properties.

scholarly journals Predicting two-dimensional topological phases in Janus materials by substitutional doping in transition metal dichalcogenide monolayers

2019 ◽  
Vol 3 (1) ◽  
Author(s):  
Aniceto B. Maghirang ◽  
Zhi-Quan Huang ◽  
Rovi Angelo B. Villaos ◽  
Chia-Hsiu Hsu ◽  
Liang-Ying Feng ◽  
...  
Keyword(s):  
Transition Metal ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Chemical Properties ◽  
Industrial Applications ◽  
Transition Metal Dichalcogenide ◽  
Two Dimensional ◽  
Substitutional Doping ◽  
Metal Dichalcogenides ◽  
Physical And Chemical

Abstract Ultrathin Janus two-dimensional (2D) materials are attracting intense interest currently. Substitutional doping of 2D transition metal dichalcogenides (TMDs) is of importance for tuning and possible enhancement of their electronic, physical and chemical properties toward industrial applications. Using systematic first-principles computations, we propose a class of Janus 2D materials based on the monolayers MX2 (M = V, Nb, Ta, Tc, or Re; X = S, Se, or Te) with halogen (F, Cl, Br, or I) or pnictogen (N, P, As, Sb, or Bi) substitution. Nontrivial phases are obtained on pnictogen substitution of group VB (V, Nb, or Ta), whereas for group VIIB (Tc or Re), the nontrivial phases are obtained for halogen substitution. Orbital analysis shows that the nontrivial phase is driven by the splitting of M-dyz and M-dxz orbitals. Our study demonstrates that the Janus 2D materials have the tunability and suitability for synthesis under various conditions.

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