Preparation of 2D material dispersions and their applications

2018 ◽  
Vol 47 (16) ◽  
pp. 6224-6266 ◽  
Author(s):  
Xingke Cai ◽  
Yuting Luo ◽  
Bilu Liu ◽  
Hui-Ming Cheng
Keyword(s):  
2D Materials ◽  
Comprehensive Review ◽  
2D Material

A comprehensive review on the exfoliation of layer materials into 2D materials, their assembly, and applications in electronics and energy.

scholarly journals Topological vectors as a fingerprinting system for 2D-material flake distributions

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Joyce C. C. Santos ◽  
Mariana C. Prado ◽  
Helane L. O. Morais ◽  
Samuel M. Sousa ◽  
Elisangela Silva-Pinto ◽  
...  
Keyword(s):  
Distribution Function ◽  
2D Materials ◽  
Shape Parameters ◽  
Representation System ◽  
Statistical Characterization ◽  
2D Material ◽  
Fast Pace ◽  
Parameter Distributions

AbstractThe production of 2D material flakes in large quantities is a rapidly evolving field and a cornerstone for their industrial applicability. Although flake production has advanced in a fast pace, its statistical characterization is somewhat slower, with few examples in the literature which may lack either modelling uniformity and/or physical equivalence to actual flake dimensions. The present work brings a methodology for 2D material flake characterization with a threefold target: (i) propose a set of morphological shape parameters that correctly map to actual and relevant flake dimensions; (ii) find a single distribution function that efficiently describes all these parameter distributions; and (iii) suggest a representation system—topological vectors—that uniquely characterizes the statistical flake morphology within a given distribution. The applicability of such methodology is illustrated via the analysis of tens of thousands flakes of graphene/graphite and talc, which were submitted to different production protocols. The richness of information unveiled by this universal methodology may help the development of necessary standardization procedures for the imminent 2D-materials industry.

scholarly journals 2D Materials in Development of Electrochemical Point-of-Care Cancer Screening Devices

Micromachines ◽  
2019 ◽  
Vol 10 (10) ◽  
pp. 662 ◽  
Author(s):  
Mohsen Mohammadniaei ◽  
Huynh Vu Nguyen ◽  
My Van Tieu ◽  
Min-Ho Lee
Keyword(s):  
Cancer Screening ◽  
2D Materials ◽  
Point Of Care ◽  
Low Cost ◽  
Clinical Analysis ◽  
Cancer Diagnostics ◽  
Electrochemical Sensing ◽  
Screening Tools ◽  
Electrochemical Biosensors ◽  
2D Material

Effective cancer treatment requires early detection and monitoring the development progress in a simple and affordable manner. Point-of care (POC) screening can provide a portable and inexpensive tool for the end-users to conveniently operate test and screen their health conditions without the necessity of special skills. Electrochemical methods hold great potential for clinical analysis of variety of chemicals and substances as well as cancer biomarkers due to their low cost, high sensitivity, multiplex detection ability, and miniaturization aptitude. Advances in two-dimensional (2D) material-based electrochemical biosensors/sensors are accelerating the performance of conventional devices toward more practical approaches. Here, recent trends in the development of 2D material-based electrochemical biosensors/sensors, as the next generation of POC cancer screening tools, are summarized. Three cancer biomarker categories, including proteins, nucleic acids, and some small molecules, will be considered. Various 2D materials will be introduced and their biomedical applications and electrochemical properties will be given. The role of 2D materials in improving the performance of electrochemical sensing mechanisms as well as the pros and cons of current sensors as the prospective devices for POC screening will be emphasized. Finally, the future scopes of implementing 2D materials in electrochemical POC cancer diagnostics for the clinical translation will be discussed.

scholarly journals Supported and Suspended 2D Material-Based FET Biosensors

Electrochem ◽  
2020 ◽  
Vol 1 (3) ◽  
pp. 260-277 ◽  
Author(s):  
Nirul Masurkar ◽  
Sundeep Varma ◽  
Leela Mohana Reddy Arava
Keyword(s):  
Field Effect Transistor ◽  
Electrochemical Biosensor ◽  
2D Materials ◽  
Atomic Layer ◽  
Fabrication Technology ◽  
Semiconducting Materials ◽  
Biomolecule Detection ◽  
2D Material ◽  
2D Nanomaterials ◽  
Effect Transistor

Field Effect Transistor (FET)-based electrochemical biosensor is gaining a lot of interest due to its malleability with modern fabrication technology and the ease at which it can be integrated with modern digital electronics. To increase the sensitivity and response time of the FET-based biosensor, many semiconducting materials have been categorized, including 2 dimensional (2D) nanomaterials. These 2D materials are easy to fabricate, increase sensitivity due to the atomic layer, and are flexible for a range of biomolecule detection. Due to the atomic layer of 2D materials each device requires a supporting substrate to fabricate a biosensor. However, uneven morphology of supporting substrate leads to unreliable output from every device due to scattering effect. This review summarizes advances in 2D material-based electrochemical biosensors both in supporting and suspended configurations by using different atomic monolayer, and presents the challenges involved in supporting substrate-based 2D biosensors. In addition, we also point out the advantages of nanomaterials over bulk materials in the biosensor domain.

Multifield-tunable magneto-optical effects in electron- and hole-doped nitrogen–graphene crystals

2019 ◽  
Vol 7 (11) ◽  
pp. 3360-3368 ◽  
Author(s):  
Xiaodong Zhou ◽  
Fei Li ◽  
Yanxia Xing ◽  
Wanxiang Feng
Keyword(s):  
2D Materials ◽  
Optical Devices ◽  
Strain Fields ◽  
2D Material ◽  
Optical Effects ◽  
Faraday Effects

The magneto-optical effects play a prominent role in probing the exotic magnetism in 2D materials. Here, we present that the magneto-optical Kerr and Faraday effects in carrier-doped nitrogen–graphene crystals can be effectively mediated by electric, magnetic, and strain fields. Our results indicate that nitrogen–graphene crystals provide a novel 2D material platform for nano-spintronics and magneto-optical devices.

scholarly journals 2D material liquid crystals for optoelectronics and photonics

2017 ◽  
Vol 5 (43) ◽  
pp. 11185-11195 ◽  
Author(s):  
B. T. Hogan ◽  
E. Kovalska ◽  
M. F. Craciun ◽  
A. Baldycheva
Keyword(s):  
Liquid Crystals ◽  
Materials Science ◽  
2D Materials ◽  
2D Material

The merging of the materials science paradigms of liquid crystals and 2D materials promises superb new opportunities for the advancement of the fields of optoelectronics and photonics. In this review, we summarise the development and applications of 2D material liquid crystals for optoelectronics and photonics.

scholarly journals Ideal optical contrast for 2D material observation using bi-layer antireflection absorbing substrates

Nanoscale ◽  
2019 ◽  
Vol 11 (13) ◽  
pp. 6129-6135 ◽  
Author(s):  
Kevin Jaouen ◽  
Renaud Cornut ◽  
Dominique Ausserré ◽  
Stéphane Campidelli ◽  
Vincent Derycke
Keyword(s):  
Double Layer ◽  
Film Growth ◽  
2D Materials ◽  
High Sensitivity ◽  
Optical Contrast ◽  
2D Material ◽  
Molecular Film

Optimized double-layer antireflection substrates allow observation of 2D materials with greatly enhanced contrast and molecular film growth with ultra-high sensitivity.

2D material broadband photodetectors

Nanoscale ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 454-476 ◽  
Author(s):  
Jiandong Yao ◽  
Guowei Yang
Keyword(s):  
2D Materials ◽  
Hybrid Structures ◽  
2D Material ◽  
Application Prospects ◽  
High Application

2D materials and their hybrid structures have high application prospects in broadband photodetection, making them promising complements to traditional schemes.

scholarly journals Superlattices based on van der Waals 2D materials

2019 ◽  
Vol 55 (77) ◽  
pp. 11498-11510 ◽  
Author(s):  
Yu Kyoung Ryu ◽  
Riccardo Frisenda ◽  
Andres Castellanos-Gomez
Keyword(s):  
State Of The Art ◽  
2D Materials ◽  
Van Der Waals ◽  
The State ◽  
2D Material

We explain in detail the state-of-the-art of 2D material-based superlattices and describe the different methods to fabricate them.

Interfacial Interactions and Tribological Behaviour of Metal-Oxide/2D-Material Contacts

2021 ◽  
Author(s):  
Shwetank Yadav ◽  
Taib Arif ◽  
Guorui Wang ◽  
Rana N.S. Sodhi ◽  
Yu Hui Cheng ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Charge Distribution ◽  
Cupric Oxide ◽  
2D Materials ◽  
Electronic Charge ◽  
Electronic Effects ◽  
Tribological Behaviour ◽  
2D Material ◽  
Dft Simulations ◽  
Interfacial Charge

Abstract This work combines experimental atomic force microscopy (AFM) and DFT simulations to study oxidized metal (oxidized copper & titanium) and 2D material (graphene & MoS2) interfaces. Combining AFM and DFT allowed identifying the interfacial interaction and established a correlation between tribological behavior, interfacial charge distribution, and variations in the potential energy profile with sliding along the metal/2D-materials interfaces. The TiO2 (rutile) and CuO (cupric oxide) metal oxides were mostly found to chemisorb along the interface with the 2D-materials. Both the metal-oxide counter-surfaces (TiO2 and CuO) exhibited higher friction force and adhesion on graphene than on MoS2. The CuO surface was inferred to be copper rich based on comparison with DFT simulations. The interfacial electronic charge distribution and relative energy change were identified to strongly influence sliding and adhesive behavior between oxidized-metal/2D-material contacts when considering only electronic effects in the DFT simulations. More homogenous interfacial charge distribution/sharing and lower surface energy variation, as found on the MoS2 surfaces, were identified to lower friction and adhesion. Non-electronic effects not captured by simulations were found to likely dominate interfacial shear strength measurements experimentally. Therefore, MoS2 should be used in interfacial applications involving TiO2 and copper rich CuO surfaces requiring lower adhesion and friction.

SCREENING EFFECTS AT ORGANIC–2D MATERIAL HETEROINTERFACES

2021 ◽  
pp. 2140008
Author(s):  
YU JIE ZHENG ◽  
ARRAMEL
Keyword(s):  
Organic Molecules ◽  
Current Knowledge ◽  
Raw Materials ◽  
2D Materials ◽  
Absorption Efficiency ◽  
Material Interfaces ◽  
Material Interface ◽  
Screening Effect ◽  
2D Material ◽  
Dielectric Screening

Organic molecule–two-dimensional material (OM–2D material) heterostructures are relatively an emergent class of hybrid-based electronic devices and yet have gained enormous interests. These systems hold promise towards application in the realization of electronic, optoelectronic and energy conversion devices, due to their tunable thickness, rich raw materials, flexibility, and also their capability to merge the high light absorption efficiency of organic molecules and the high carrier mobility of 2D materials. Dielectric screening effects have a large influence on electronic structure and optical properties at the OM–2D material interface due to the low intrinsic dielectric polarizability of both organic molecules and 2D materials. Here, we will review current knowledge about the dielectric screening behaviors in 2D materials and the screening effect at the OM–2D material heterointerfaces, including the physical origin of the dielectric screening effect across such interfaces, how to investigate it, and the influence of the screening effect on OM–2D material interfaces. Engineering of the dielectric screening effects in OM–2D material systems is also discussed. We conclude the review by illustrating a brief introduction of other important factors, e.g. defects, charge transfer, and hybridization, that will contribute to the screening effect and these features should be considered for the future scientific and device development of OM–2D material heterostructures.

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