Direct ink writing of 2D material-based supercapacitors

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.

Reactive plasma cleaning and restoration of transition metal dichalcogenide monolayers

npj 2D Materials and Applications ◽

10.1038/s41699-020-00197-7 ◽

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 ◽

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.

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

npj 2D Materials and Applications ◽

10.1038/s41699-019-0118-2 ◽

2019 ◽

Vol 3 (1) ◽

Cited By ~ 10

Author(s):

Aniceto B. Maghirang ◽

Zhi-Quan Huang ◽

Rovi Angelo B. Villaos ◽

Chia-Hsiu Hsu ◽

Liang-Ying Feng ◽

...

Keyword(s):

Transition Metal ◽

2D Materials ◽

Chemical Properties ◽

Industrial Applications ◽

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.

Two-Dimensional Material-Based Colorimetric Biosensors: A Review

Biosensors ◽

10.3390/bios11080259 ◽

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 ◽

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.

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

Nanoscale Advances ◽

10.1039/d0na00779j ◽

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 ◽

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.

Exfoliated transition metal dichalcogenide nanosheets for supercapacitor and sodium ion battery applications

Royal Society Open Science ◽

10.1098/rsos.190437 ◽

2019 ◽

Vol 6 (8) ◽

pp. 190437 ◽

Cited By ~ 6

Author(s):

Santanu Mukherjee ◽

Jonathan Turnley ◽

Elisabeth Mansfield ◽

Jason Holm ◽

Davi Soares ◽

...

Keyword(s):

Transition Metal ◽

Metal Ion ◽

Coulombic Efficiency ◽

Sodium Ion ◽

Composite Electrodes ◽

Metal Dichalcogenides ◽

Storage Technologies ◽

Supercapacitor Applications

Growing concerns regarding the safety, flammability and hazards posed by Li-ion systems have led to research on alternative rechargeable metal-ion electrochemical storage technologies. Among the most notable of these are Na-ion supercapacitors and batteries, motivated, in part, by the similar electrochemistry of Li and Na ions. However, sodium ion batteries (SIBs) come with their own set of issues, especially the large size of the Na + ion, its relatively sluggish kinetics and low energy densities. This makes the development of novel materials and appropriate electrode architecture of absolute significance. Transition metal dichalcogenides (TMDs) have attracted a lot of attention in this regard due to their relative ease of exfoliation, diverse morphologies and architectures with superior electronic properties. Here, we study the electrochemical performance of Mo-based two-dimensional (2D) layered TMDs (e.g. MoS 2 , MoSe 2 and MoTe 2 ), exfoliated in a superacid, for battery and supercapacitor applications. The exfoliated TMD flakes were interfaced with reduced graphene oxide (rGO) to be used as composite electrodes. Electron microscopy, elemental mapping and Raman spectra were used to analyse the exfoliated material and confirm the formation of 2D TMD/rGO layer morphology. For supercapacitor applications in aqueous electrolyte, the sulfide-based TMD (MoS 2 ) exhibited the best performance, providing an areal capacitance of 60.25 mF cm −2 . For SIB applications, TMD electrodes exhibited significantly higher charge capacities than the neat rGO electrode. The initial desodiation capacities for the composite electrodes are 468.84 mAh g −1 (1687.82 C g −1 ), 399.10 mAh g −1 (1436.76 C g −1 ) and 387.36 mAh g −1 (1394.49 C g −1 ) for MoS 2 , MoSe 2 and MoTe 2 , respectively. Also, the MoS 2 and MoSe 2 composite electrodes provided a coulombic efficiency of near 100 % after a few initial cycles.

Squeezed metallic droplet with tunable Kubo gap and charge injection in transition metal dichalcogenides

Proceedings of the National Academy of Sciences ◽

10.1073/pnas.1920036117 ◽

2020 ◽

Vol 117 (12) ◽

pp. 6362-6369 ◽

Cited By ~ 3

Author(s):

Jiaren Yuan ◽

Yuanping Chen ◽

Yuee Xie ◽

Xiaoyu Zhang ◽

Dewei Rao ◽

...

Keyword(s):

Transition Metal ◽

Electron Tunneling ◽

Energy Levels ◽

Photon Emission ◽

Three Dimensional ◽

Electronic Energy ◽

Metallic Droplet ◽

Electronic Energy Levels

Shrinking the size of a bulk metal into nanoscale leads to the discreteness of electronic energy levels, the so-called Kubo gap δ. Renormalization of the electronic properties with a tunable and size-dependent δ renders fascinating photon emission and electron tunneling. In contrast with usual three-dimensional (3D) metal clusters, here we demonstrate that Kubo gap δ can be achieved with a two-dimensional (2D) metallic transition metal dichalcogenide (i.e., 1T′-phase MoTe2) nanocluster embedded in a semiconducting polymorph (i.e., 1H-phase MoTe2). Such a 1T′/1H MoTe2nanodomain resembles a 3D metallic droplet squeezed in a 2D space which shows a strong polarization catastrophe while simultaneously maintaining its bond integrity, which is absent in traditional δ-gapped 3D clusters. The weak screening of the host 2D MoTe2leads to photon emission of such pseudometallic systems and a ballistic injection of carriers in the 1T′/1H/1T′ homojunctions which may find applications in sensors and 2D reconfigurable devices.

Recent advances in the field of transition metal dichalcogenides for biomedical applications

Nanoscale ◽

10.1039/c8nr04284e ◽

2018 ◽

Vol 10 (35) ◽

pp. 16365-16397 ◽

Cited By ~ 50

Author(s):

Vipul Agarwal ◽

Kaushik Chatterjee

Keyword(s):

Transition Metal ◽

Biomedical Applications ◽

2D Materials ◽

Solid Lubrication ◽

Unique Combination ◽

Energy Materials ◽

Wide Range ◽

Metal Dichalcogenides

Nanosheets of transition metal dichalcogenide (TMDs), the graphene-like two-dimensional (2D) materials, exhibit a unique combination of properties and have attracted enormous research interest for a wide range of applications including catalysis, functional electronics, solid lubrication, photovoltaics, energy materials and most recently in biomedical applications.

Three-Dimensional Transition Metal Dichalcogenide Helical Nanorod Arrays for High-Performance Aluminum-Ion Batteries

ECS Meeting Abstracts ◽

10.1149/ma2021-0233973mtgabs ◽

2021 ◽

Vol MA2021-02 (33) ◽

pp. 973-973

Author(s):

Shu-Chi Wu ◽

Yuanfei Ai ◽

Tzu-Yi Yang ◽

Shin-Yi Tang ◽

Kuangye Wang ◽

...

Keyword(s):

Transition Metal ◽

High Performance ◽

Three Dimensional ◽

Nanorod Arrays ◽

Aluminum Ion

Recent Advance in the Fabrication of 2D and 3D Metal Carbides-Based Nanomaterials for Energy and Environmental Applications

Nanomaterials ◽

10.3390/nano11010246 ◽

2021 ◽

Vol 11 (1) ◽

pp. 246

Author(s):

Keming Wan ◽

Yalin Li ◽

Yan Wang ◽

Gang Wei

Keyword(s):

Environmental Science ◽

Materials Science ◽

2D Materials ◽

Three Dimensional ◽

Chemical Properties ◽

Environmental Applications ◽

Synthesis Methods ◽

Metal Carbides ◽

New Family ◽

2D And 3D

Two-dimensional (2D) nanomaterials have attracted increased interest and exhibited extended applications from nanotechnology to materials science, biomedicine, tissue engineering, as well as energy storage and environmental science. With the development of the synthesis and fabrication of 2D materials, a new family of 2D materials, metal carbides (MCs), revealed promising applications in recent years, and have been utilized for the fabrication of various functional 2D and three-dimensional (3D) nanomaterials for energy and environmental applications, ascribing to the unique physical and chemical properties of MCs. In this review, we present recent advance in the synthesis, fabrication, and applications of 2D and 3D MC-based nanomaterials. For this aim, we first summarize typical synthesis methods of MCs, and then demonstrate the progress on the fabrication of 2D and 3D MC-based nanomaterials. To the end, the applications of MC-based 2D and 3D materials for chemical batteries, supercapacitors, water splitting, photodegradation, removal of heavy metals, and electromagnetic shielding are introduced and discussed. This work provides useful information on the preparation, hybridization, structural tailoring, and applications of MC-based materials, and is expected to inspire the design and fabrication of novel and functional MXene materials with improved performance.