scholarly journals Two-Dimensional Material-Based Colorimetric Biosensors: A Review

Biosensors ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 259
Author(s):  
Danzhu Zhu ◽  
Bin Liu ◽  
Gang Wei
Keyword(s):  
Transition Metal ◽  
High Performance ◽  
Material Selection ◽  
2D Materials ◽  
Low Cost ◽  
Transition Metal Dichalcogenide ◽  
Two Dimensional ◽  
Metallic Ions ◽  
Colorimetric Sensing ◽  
2D Material

Two-dimensional (2D) materials such as graphene, graphene oxide, transition metal oxide, MXene and others have shown high potential for the design and fabrication of various sensors and biosensors due to their 2D layered structure and unique properties. Compared to traditional fluorescent, electrochemical, and electrical biosensors, colorimetric biosensors exhibit several advantages including naked-eye determination, low cost, quick response, and easy fabrication. In this review, we present recent advances in the design, fabrication, and applications of 2D material-based high-performance colorimetric biosensors. Potential colorimetric sensing mechanisms and optimal material selection as well as sensor fabrication are introduced in brief. In addition, colorimetric biosensors based on different 2D materials such as graphene, transition metal dichalcogenide/oxide, MXenes, metal–organic frameworks, and metal nanoplates for the sensitive detection of DNA, proteins, viruses, small molecules, metallic ions, and others are presented and discussed in detail. This work will be helpful for readers to understand the knowledge of 2D material modification, nanozymes, and the synthesis of hybrid materials; meanwhile, it could be valuable to promote the design, fabrication, and applications of 2D material-based sensors and biosensors in quick bioanalysis and disease diagnostics.

Transition Metal Dichalcogenide-Decorated MXenes: Promising Hybrid Electrodes for Energy Storage and Conversion Applications

2021 ◽  
Author(s):  
Hemanth N R ◽  
Taekyung Kim ◽  
Byeongyoon Kim ◽  
Arvind H. Jadhav ◽  
Kwangyeol Lee ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Harvesting ◽  
Transition Metal ◽  
2D Materials ◽  
Energy Storage And Conversion ◽  
Transition Metal Dichalcogenide ◽  
Two Dimensional ◽  
Unique Structure ◽  
Wide Range ◽  
The Family

Various two-dimensional (2D) materials have demonstrated unique structure-dependent characteristics that are conducive to energy-harvesting applications. Among them, the family of layered MXenes has found a wide range of applications in...

Direct ink writing of 2D material-based supercapacitors

2D Materials ◽  
2021 ◽  
Author(s):  
Xiaocong Tian
Keyword(s):  
Transition Metal ◽  
2D Materials ◽  
Three Dimensional ◽  
Chemical Properties ◽  
Transition Metal Dichalcogenide ◽  
Supercapacitor Electrode ◽  
2D Material ◽  
Direct Ink Writing ◽  
Challenges And Opportunities ◽  
Supercapacitor Applications

Abstract Atomically thin two-dimensional (2D) materials are excellent supercapacitor electrode candidates with intriguing physical and chemical properties. As a typical three-dimensional (3D) printing technique, direct ink writing (DIW) provides a new platform to bridge the gap between 2D materials and advanced supercapacitor electrodes. In the current review, recent progresses in DIW of 2D materials for supercapacitor applications is systematically presented, in which basic DIW processes, key scientific/technical points and corresponding strategies are highlighted. Ink fabrication and optimization based on 2D materials are discussed for supercapacitors, and recent advances in DIW of a variety of 2D material (including graphene, transition metal carbides and/or nitride (MXene), transition metal dichalcogenide (TMD) and others)-based supercapacitor electrodes are offered. Furthermore, conclusions along with a brief discussion on challenges and opportunities of DIW-manufactured 2D materials are also provided for future supercapacitor applications.

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.

Charge transfer doping with an organic layer to achieve a high-performance p-type WSe2 transistor

2021 ◽  
Author(s):  
Minho Yoon ◽  
Jiyoul Lee
Keyword(s):  
Mechanical Properties ◽  
Charge Transfer ◽  
Transition Metal ◽  
High Performance ◽  
Organic Layer ◽  
Transition Metal Dichalcogenide ◽  
Two Dimensional ◽  
Next Generation ◽  
Intrinsic Semiconductor ◽  
P Type

Two-dimensional WSe2, a transition metal dichalcogenide (TMD), is a promising intrinsic semiconductor due to its outstanding electrical and mechanical properties, useful for next-generation electronics. However, its pn coupling and logic...

Co-planar two-dimensional Metal-Insulator-Semiconductor Capacitor: Numerical study of the device electrostatics.

2017 ◽  
Author(s):  
Varun Bheemireddy
Keyword(s):  
Space Charge ◽  
High Performance ◽  
Numerical Study ◽  
2D Materials ◽  
Space Charge Density ◽  
Two Dimensional ◽  
Short Channel ◽  
Metal Insulator ◽  
Metal Insulator Semiconductor ◽  
New Family

The two-dimensional(2D) materials are highly promising candidates to realise elegant and e cient transistor. In the present letter, we conjecture a novel co-planar metal-insulator-semiconductor(MIS) device(capacitor) completely based on lateral 2D materials architecture and perform numerical study of the capacitor with a particular emphasis on its di erences with the conventional 3D MIS electrostatics. The space-charge density features a long charge-tail extending into the bulk of the semiconductor as opposed to the rapid decay in 3D capacitor. Equivalently, total space-charge and semiconductor capacitance densities are atleast an order of magnitude more in 2D semiconductor. In contrast to the bulk capacitor, expansion of maximum depletion width in 2D semiconductor is observed with increasing doping concentration due to lower electrostatic screening. The heuristic approach of performance analysis(2D vs 3D) for digital-logic transistor suggest higher ON-OFF current ratio in the long-channel limit even without third dimension and considerable room to maximise the performance of short-channel transistor. The present results could potentially trigger the exploration of new family of co-planar at transistors that could play a signi significant role in the future low-power and/or high performance electronics.<br>

scholarly journals Visualization of Multifractal Superconductivity in a Two-Dimensional Transition Metal Dichalcogenide in the Weak-Disorder Regime

Nano Letters ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 5111-5118 ◽  
Author(s):  
Carmen Rubio-Verdú ◽  
Antonio M. Garcı́a-Garcı́a ◽  
Hyejin Ryu ◽  
Deung-Jang Choi ◽  
Javier Zaldı́var ◽  
...  
Keyword(s):  
Transition Metal ◽  
Transition Metal Dichalcogenide ◽  
Two Dimensional ◽  
Weak Disorder

scholarly journals Second-harmonic generation enhancement in monolayer transition-metal dichalcogenides by using an epsilon-near-zero substrate

2021 ◽  
Vol 3 (1) ◽  
pp. 272-278
Author(s):  
Pilar G. Vianna ◽  
Aline dos S. Almeida ◽  
Rodrigo M. Gerosa ◽  
Dario A. Bahamon ◽  
Christiano J. S. de Matos
Keyword(s):  
Dielectric Constant ◽  
Transition Metal ◽  
Harmonic Generation ◽  
Nonlinear Effect ◽  
Second Harmonic ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Transition Metal Dichalcogenide ◽  
Metal Dichalcogenides ◽  
Epsilon Near Zero

The scheme illustrates a monolayer transition-metal dichalcogenide on an epsilon-near-zero substrate. The substrate near-zero dielectric constant is used as the enhancement mechanism to maximize the SHG nonlinear effect on monolayer 2D materials.

Combined Healing and Doping of Transition Metal Dichalcogenides Through Molecular Functionalization

2021 ◽  
Author(s):  
Sai Manoj Gali ◽  
David Beljonne
Keyword(s):  
Transition Metal ◽  
Charge Transport ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Two Dimensional ◽  
Metal Dichalcogenides

Transition Metal Dichalcogenides (TMDCs) are emerging as promising two-dimensional (2D) materials. Yet, TMDCs are prone to inherent defects such as chalcogen vacancies, which are detrimental to charge transport. Passivation of...

scholarly journals Reactive plasma cleaning and restoration of transition metal dichalcogenide monolayers

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Daniil Marinov ◽  
Jean-François de Marneffe ◽  
Quentin Smets ◽  
Goutham Arutchelvan ◽  
Kristof M. Bal ◽  
...  
Keyword(s):  
High Temperature ◽  
Transition Metal ◽  
Field Effect Transistors ◽  
Removal Rate ◽  
2D Materials ◽  
Scale Up ◽  
Transition Metal Dichalcogenides ◽  
Chemical Properties ◽  
Plasma Cleaning ◽  
Transition Metal Dichalcogenide

AbstractThe cleaning of two-dimensional (2D) materials is an essential step in the fabrication of future devices, leveraging their unique physical, optical, and chemical properties. Part of these emerging 2D materials are transition metal dichalcogenides (TMDs). So far there is limited understanding of the cleaning of “monolayer” TMD materials. In this study, we report on the use of downstream H2 plasma to clean the surface of monolayer WS2 grown by MOCVD. We demonstrate that high-temperature processing is essential, allowing to maximize the removal rate of polymers and to mitigate damage caused to the WS2 in the form of sulfur vacancies. We show that low temperature in situ carbonyl sulfide (OCS) soak is an efficient way to resulfurize the material, besides high-temperature H2S annealing. The cleaning processes and mechanisms elucidated in this work are tested on back-gated field-effect transistors, confirming that transport properties of WS2 devices can be maintained by the combination of H2 plasma cleaning and OCS restoration. The low-damage plasma cleaning based on H2 and OCS is very reproducible, fast (completed in a few minutes) and uses a 300 mm industrial plasma etch system qualified for standard semiconductor pilot production. This process is, therefore, expected to enable the industrial scale-up of 2D-based devices, co-integrated with silicon technology.

Controllable Synthesis of Ultrathin Layered Transition Metallic Hydroxide/Zeolitic Imidazolate Framework-67 Hybrid Nanosheets for High-Performance Supercapacitors

2021 ◽  
Author(s):  
Chunli Liu ◽  
Yang Bai ◽  
Ji Wang ◽  
Ziming Qiu ◽  
Huan Pang
Keyword(s):  
Charge Transfer ◽  
Energy Conversion ◽  
High Performance ◽  
2D Materials ◽  
Two Dimensional ◽  
Controllable Synthesis ◽  
Zeolitic Imidazolate Framework ◽  
Fast Charge ◽  
Energy Conversion And Storage ◽  
And Storage

Two-dimensional (2D) materials with structures having diverse features are promising for application in energy conversion and storage. A stronger layered orientation can guarantee fast charge transfer along the 2D planes...

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