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

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.

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Thermally-Induced Dehydrogenative Coupling of Organosilanes and H-Terminated Silicon Quantum Dots onto Germanane Surfaces

10.26434/chemrxiv.11794404 ◽

2020 ◽

Author(s):

Haoyang Yu ◽

Alyxandra Thiessen ◽

Md Asjad Hossain ◽

Marc Julian Kloberg ◽

Bernhard Rieger ◽

...

Keyword(s):

2D Materials ◽

Future Generation ◽

Optical Devices ◽

Surface Reactivity ◽

Organic Monolayers ◽

Present Contribution ◽

Thermally Induced ◽

Dehydrogenative Coupling ◽

Silicon Quantum Dot ◽

Covalently Bonded

<div><div><div><p>Covalently bonded organic monolayers play important roles in defining the solution processability, ambient stability, and electronic properties of two-dimensional (2D) materials such as Ge nanosheets (GeNSs); they also hold promise of providing avenues for the fabrication of future generation electronic and optical devices. Functionalization of GeNS normally involves surface moieties linked through covalent Ge−C bonds. In the present contribution we extend the scope of surface linkages to include Si−Ge bonding and present the first demonstration of heteronuclear dehydrocoupling of organosilanes to hydride-terminated GeNSs obtained from the deintercalation and exfoliation of CaGe2. We further exploit this new surface reactivity and demonstrated the preparation of directly bonded silicon quantum dot-Ge nanosheet hybrids.</p></div></div></div>

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

npj 2D Materials and Applications ◽

10.1038/s41699-021-00234-z ◽

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.

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All-Optical Modulation Technology Based on 2D Layered Materials

Micromachines ◽

10.3390/mi13010092 ◽

2022 ◽

Vol 13 (1) ◽

pp. 92

Author(s):

Hongyan Yang ◽

Yunzheng Wang ◽

Zian Cheak Tiu ◽

Sin Jin Tan ◽

Libo Yuan ◽

...

Keyword(s):

Optical Properties ◽

Communication Systems ◽

Near Infrared ◽

2D Materials ◽

Optical Devices ◽

Optical Systems ◽

Optical Modulation ◽

Wavelength Converter ◽

Optical Modulators ◽

All Optical

In the advancement of photonics technologies, all-optical systems are highly demanded in ultrafast photonics, signal processing, optical sensing and optical communication systems. All-optical devices are the core elements to realize the next generation of photonics integration system and optical interconnection. Thus, the exploration of new optoelectronics materials that exhibit different optical properties is a highlighted research direction. The emerging two-dimensional (2D) materials such as graphene, black phosphorus (BP), transition metal dichalcogenides (TMDs) and MXene have proved great potential in the evolution of photonics technologies. The optical properties of 2D materials comprising the energy bandgap, third-order nonlinearity, nonlinear absorption and thermo-optics coefficient can be tailored for different optical applications. Over the past decade, the explorations of 2D materials in photonics applications have extended to all-optical modulators, all-optical switches, an all-optical wavelength converter, covering the visible, near-infrared and Terahertz wavelength range. Herein, we review different types of 2D materials, their fabrication processes and optical properties. In addition, we also summarize the recent advances of all-optical modulation based on 2D materials. Finally, we conclude on the perspectives on and challenges of the future development of the 2D material-based all-optical devices.

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2D materials towards ultrafast photonic applications

Physical Chemistry Chemical Physics ◽

10.1039/d0cp02841j ◽

2020 ◽

Vol 22 (39) ◽

pp. 22140-22156

Author(s):

Xin-Ping Zhai ◽

Bo Ma ◽

Qiang Wang ◽

Hao-Li Zhang

Keyword(s):

Optical Communications ◽

2D Materials ◽

Optical Limiting ◽

Mode Locking ◽

Optical Devices ◽

Optical Modulation ◽

Two Dimensional ◽

Two Dimensional Materials ◽

All Optical ◽

Ultrafast Photonics

Two-dimensional materials are now excelling in yet another arena of ultrafast photonics, including optical modulation through optical limiting/mode-locking, photodetectors, optical communications, integrated miniaturized all-optical devices, etc.

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

Micromachines ◽

10.3390/mi10100662 ◽

2019 ◽

Vol 10 (10) ◽

pp. 662 ◽

Cited By ~ 5

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.

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Supported and Suspended 2D Material-Based FET Biosensors

Electrochem ◽

10.3390/electrochem1030017 ◽

2020 ◽

Vol 1 (3) ◽

pp. 260-277 ◽

Cited By ~ 1

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.

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2D material liquid crystals for optoelectronics and photonics

Journal of Materials Chemistry C ◽

10.1039/c7tc02549a ◽

2017 ◽

Vol 5 (43) ◽

pp. 11185-11195 ◽

Cited By ~ 24

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.

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

Nanoscale ◽

10.1039/c8nr09983a ◽

2019 ◽

Vol 11 (13) ◽

pp. 6129-6135 ◽

Cited By ~ 4

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.

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2D material broadband photodetectors

Nanoscale ◽

10.1039/c9nr09070c ◽

2020 ◽

Vol 12 (2) ◽

pp. 454-476 ◽

Cited By ~ 17

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.

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