Electrical Characterization and Nanoindentation of Opto-electro-mechanical Percolative Composites from 2D Layered Materials

MRS Advances ◽  
2017 ◽  
Vol 2 (60) ◽  
pp. 3741-3747
Author(s):  
Jorge A. Catalán ◽  
Ricardo Martínez ◽  
Yirong Lin ◽  
Anupama B. Kaul
Keyword(s):  
Low Cost ◽  
Matrix Material ◽  
Transition Metal Dichalcogenides ◽  
Electrical Characterization ◽  
Filler Materials ◽  
2D Layered Materials ◽  
The Matrix ◽  
Wide Availability ◽  
Metal Dichalcogenides ◽  
Graphite Composites

ABSTRACTIn this paper, we have developed composites with Poly-methyl methacrylate (PMMA) as the matrix material, while transition metal dichalcogenides (TMDCs), MoS2 and WS2 and graphite served as the filler materials. The PMMA was chosen as the matrix material due to its low-cost, wide availability, as well as its promising mechanical and optical properties for enabling opto-electro-mechanical sensing devices. The amount of filler material used ranged from 100 mg/ml up to 400 mg/ml. With the aid of designed fixtures we related the electrical properties of the PMMA-based composite sensors to the degree of strain or deformation. Additionally, a nanoindenter was used to measure the modulus of elasticity, with values as low as 2 GPa and as high as 20 GPa for the graphite composites, and hardness values which ranged from 0.1 GPa to ∼ 1.6 GPa.

scholarly journals Interface Engineering for Perovskite Solar Cells Based on 2D-Materials: A Physics Point of View

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5843
Author(s):  
Rosaria Verduci ◽  
Antonio Agresti ◽  
Valentino Romano ◽  
Giovanna D’Angelo
Keyword(s):  
Solar Cells ◽  
Transition Metal ◽  
2D Materials ◽  
Low Cost ◽  
Transition Metal Dichalcogenides ◽  
Perovskite Solar Cells ◽  
Precursor Solution ◽  
Point Of View ◽  
Physical Mechanisms ◽  
Metal Dichalcogenides

The last decade has witnessed the advance of metal halide perovskites as a promising low-cost and efficient class of light harvesters used in solar cells (SCs). Remarkably, the efficiency of lab-scale perovskite solar cells (PSCs) reached a power conversion efficiency of 25.5% in just ~10 years of research, rivalling the current record of 26.1% for Si-based PVs. To further boost the performances of PSCs, the use of 2D materials (such as graphene, transition metal dichalcogenides and transition metal carbides, nitrides and carbonitrides) has been proposed, thanks to their remarkable optoelectronic properties (that can be tuned with proper chemical composition engineering) and chemical stability. In particular, 2D materials have been demonstrated as promising candidates for (i) accelerating hot carrier transfer across the interfaces between the perovskite and the charge extraction layers; (ii) improving the crystallization of the perovskite layers (when used as additives in the precursor solution); (iii) favoring electronic bands alignment through tuning of the work function. In this mini-review, we discuss the physical mechanisms underlying the increased efficiency of 2D material-based PSCs, focusing on the three aforementioned effects.

scholarly journals A facile synthetic route to tungsten diselenide using a new precursor containing a long alkyl chain cation for multifunctional electronic and optoelectronic applications

RSC Advances ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 6169-6176
Author(s):  
Jahee Kim ◽  
Yi Rang Lim ◽  
Yeoheung Yoon ◽  
Wooseok Song ◽  
Bo Keun Park ◽  
...  
Keyword(s):  
Large Scale ◽  
Alkyl Chain ◽  
Low Cost ◽  
Transition Metal Dichalcogenides ◽  
Two Dimensional ◽  
Single Source ◽  
Synthetic Route ◽  
Decomposition Processes ◽  
Metal Dichalcogenides ◽  
Long Alkyl Chain

Single source precursors for coating and subsequent thermal decomposition processes enable a large-scale, low-cost synthesis of two-dimensional transition metal dichalcogenides (TMDs).

scholarly journals Mechanochemical preparation of piezoelectric nanomaterials: BN, MoS2 and WS2 2D materials and their glycine-cocrystals

2020 ◽  
Vol 5 (2) ◽  
pp. 331-335 ◽  
Author(s):  
Viviana Jehová González ◽  
Antonio M. Rodríguez ◽  
Ismael Payo ◽  
Ester Vázquez
Keyword(s):  
Transition Metal ◽  
Boron Nitride ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Layered Materials ◽  
Molybdenum Disulphide ◽  
2D Layered Materials ◽  
Metal Dichalcogenides

Different 2D-layered materials of transition metal dichalcogenides (TMDCs) such as boron nitride (BN) or molybdenum disulphide (MoS2) have been theorised to have piezoelectric behaviour.

scholarly journals Enhanced Hydrogen Evolution Reaction in Surface Functionalized MoS2 Monolayers

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 70
Author(s):  
Sangyeon Pak ◽  
Jungmoon Lim ◽  
John Hong ◽  
SeungNam Cha
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Hydrogen Generation ◽  
Low Cost ◽  
Transition Metal Dichalcogenides ◽  
Underlying Mechanism ◽  
Mos2 Monolayer ◽  
N Doping ◽  
Metal Dichalcogenides ◽  
Mos2 Monolayers

Monolayered, semiconducting MoS2 and their transition metal dichalcogenides (TMDCs) families are promising and low-cost materials for hydrogen generation through electrolytes (HER, hydrogen evolution reaction) due to their high activities and electrochemical stability during the reaction. However, there is still a lack of understanding in identifying the underlying mechanism responsible for improving the electrocatalytic properties of theses monolayers. In this work, we investigated the significance of controlling carrier densities in a MoS2 monolayer and in turn the corresponding electrocatalytic behaviors in relation to the energy band structure of MoS2. Surface functionalization was employed to achieve p-doping and n-doping in the MoS2 monolayer that led to MoS2 electrochemical devices with different catalytic performances. Specifically, the electron-rich MoS2 surface showed lower overpotential and Tafel slope compared to the MoS2 with surface functional groups that contributed to p-doping. We attributed such enhancement to the increase in the carrier density and the corresponding Fermi level that accelerated HER and charge transfer kinetics. These findings are of high importance in designing electrocatalysts based on two-dimensional TMDCs.

scholarly journals Two-dimensional inorganic analogues of graphene: transition metal dichalcogenides

2016 ◽  
Vol 374 (2076) ◽  
pp. 20150318 ◽  
Author(s):  
Manoj K. Jana ◽  
C. N. R. Rao
Keyword(s):  
Transition Metal ◽  
Transition Metal Dichalcogenides ◽  
Single Layer ◽  
Layered Materials ◽  
Two Dimensional ◽  
2D Layered Materials ◽  
Wide Range ◽  
Buckminster Fullerene ◽  
Metal Dichalcogenides ◽  
Layered Transition Metal

The discovery of graphene marks a major event in the physics and chemistry of materials. The amazing properties of this two-dimensional (2D) material have prompted research on other 2D layered materials, of which layered transition metal dichalcogenides (TMDCs) are important members. Single-layer and few-layer TMDCs have been synthesized and characterized. They possess a wide range of properties many of which have not been known hitherto. A typical example of such materials is MoS 2 . In this article, we briefly present various aspects of layered analogues of graphene as exemplified by TMDCs. The discussion includes not only synthesis and characterization, but also various properties and phenomena exhibited by the TMDCs. This article is part of the themed issue ‘Fullerenes: past, present and future, celebrating the 30th anniversary of Buckminster Fullerene’.

scholarly journals Solution-processed two-dimensional materials for ultrafast fiber lasers (invited)

Nanophotonics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 2169-2189 ◽  
Author(s):  
Bo Fu ◽  
Jingxuan Sun ◽  
Gang Wang ◽  
Ce Shang ◽  
Yuxuan Ma ◽  
...  
Keyword(s):  
Fiber Lasers ◽  
Modulation Depth ◽  
2D Materials ◽  
Low Cost ◽  
Transition Metal Dichalcogenides ◽  
Solution Processing ◽  
Two Dimensional ◽  
Solution Processed ◽  
Metal Dichalcogenides ◽  
And Performance

AbstractSince graphene was first reported as a saturable absorber to achieve ultrafast pulses in fiber lasers, many other two-dimensional (2D) materials, such as topological insulators, transition metal dichalcogenides, black phosphorus, and MXenes, have been widely investigated in fiber lasers due to their broadband operation, ultrafast recovery time, and controllable modulation depth. Recently, solution-processing methods for the fabrication of 2D materials have attracted considerable interest due to their advantages of low cost, easy fabrication, and scalability. Here, we review the various solution-processed methods for the preparation of different 2D materials. Then, the applications and performance of solution-processing-based 2D materials in fiber lasers are discussed. Finally, a perspective of the solution-processed methods and 2D material-based saturable absorbers are presented.

Characterization of new structural core materials based on vinyl ester and hollow ceramic microspheres

2003 ◽  
Vol 217 (3) ◽  
pp. 221-228
Author(s):  
S R Ayers ◽  
G M Van Erp
Keyword(s):  
Vinyl Ester ◽  
Structural Engineering ◽  
Low Cost ◽  
Matrix Material ◽  
Research Programme ◽  
Core Material ◽  
Engineering Structures ◽  
Ongoing Research ◽  
The Matrix ◽  
Core Materials

A new class of structural core material has been developed at the University of Southern Queensland for applications of composite materials in civil and structural engineering. These materials combine polymer resins with hollow ceramic microspheres to produce core materials with high structural capacity at low cost. A number of prototype structural elements using these materials have displayed significant potential for application in civil engineering structures. An ongoing research programme has been initiated to improve fundamental understanding of these materials and to provide the knowledge required for broad utilization. This current study has investigated the behaviour of core material formulations based on vinyl ester resins and hollow ceramic cenospheres. Investigations have focused on identifying key relationships between the constituent materials and resulting mechanical properties of the core material. A variety of matrix and filler characteristics have been examined. This work has shown that, at the type of filler levels considered feasible for structural engineering applications (vf > 30 per cent), the behaviour of the material is largely determined by the filler particles, with only minimal influence from the matrix material. Further investigations are continuing to quantify these effects and to develop predictive models for key relationships.

Origin of layer-dependent SERS tunability in 2D transition metal dichalcogenides

2021 ◽  
Author(s):  
Mingze Li ◽  
Yimeng Gao ◽  
Xingce Fan ◽  
Yunjia Wei ◽  
Qi Hao ◽  
...  
Keyword(s):  
Transition Metal ◽  
Noble Metals ◽  
Transition Metal Dichalcogenides ◽  
Two Dimensional ◽  
2D Semiconductors ◽  
Surface Enhanced ◽  
The Matrix ◽  
Surface Enhanced Raman ◽  
Metal Dichalcogenides ◽  
Enhanced Raman Scattering

Two-dimensional (2D) semiconductors are expected to replace noble metals to become the matrix materials of next generation of commercial surface-enhanced Raman scattering (SERS) chips. Herein, we systematically studied the influence...

scholarly journals Laser printed two-dimensional transition metal dichalcogenides

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Omar Adnan Abbas ◽  
Adam Henry Lewis ◽  
Nikolaos Aspiotis ◽  
Chung-Che Huang ◽  
Ioannis Zeimpekis ◽  
...  
Keyword(s):  
Transition Metal ◽  
Low Cost ◽  
Transition Metal Dichalcogenides ◽  
Light Modulation ◽  
Ambient Conditions ◽  
Large Area ◽  
Laser Printing ◽  
Metal Dichalcogenides ◽  
Versatile Technique ◽  
Post Synthesis

AbstractLaser processing is a highly versatile technique for the post-synthesis treatment and modification of transition metal dichalcogenides (TMDCs). However, to date, TMDCs synthesis typically relies on large area CVD growth and lithographic post-processing for nanodevice fabrication, thus relying heavily on complex, capital intensive, vacuum-based processing environments and fabrication tools. This inflexibility necessarily restricts the development of facile, fast, very low-cost synthesis protocols. Here we show that direct, spatially selective synthesis of 2D-TMDCs devices that exhibit excellent electrical, Raman and photoluminescence properties can be realized using laser printing under ambient conditions with minimal lithographic or thermal overheads. Our simple, elegant process can be scaled via conventional laser printing approaches including spatial light modulation and digital light engines to enable mass production protocols such as roll-to-roll processing.

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