2D Materials-Based Aptamer Biosensors: Present Status and Way Forward

: Current advances in constructing functional nanomaterials and elegantly designed nanostructures have opened up new possibilities for the fabrication of viable field biosensors. Two-dimensional materials (2DMs) have fascinated much attention due to their chemical, optical, physicochemical, and electronic properties. They are ultrathin nanomaterials with unique properties such as high surface-to-volume ratio, surface charge, shape, high anisotropy, and adjustable chemical functionality. 2DMs such as graphene-based 2D materials, Silicate clays, layered double hydroxides (LDHs), MXenes, transition metal dichalcogenides (TMDs), and transition metal oxides (TMOs) offer intensified physicochemical and biological functionality and have proven to be very promising candidates for biological applications and technologies. 2DMs have a multivalent structure that can easily bind to single-stranded DNA/RNA (aptamers) through covalent, non-covalent, hydrogen bond, and π-stacking interactions, whereas aptamers have a small size, excellent chemical stability, and low immunogenicity with high affinity and specificity. This review discussed the potential of various 2D material-based aptasensor for diagnostic applications, e.g., protein detection, environmental monitoring, pathogens detection, etc.

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Theoretical Insights to MoS2 and Janus (MoSSe) Based 2D van der Waals Heterostructures: Emerging Direct Z-scheme Photocatalysts

Nanoscale Advances ◽

10.1039/d1na00154j ◽

2021 ◽

Author(s):

Arunima Singh ◽

Manjari Jain ◽

Saswata Bhattacharya

Keyword(s):

Transition Metal ◽

Metal Oxides ◽

Transition Metal Oxides ◽

2D Materials ◽

Van Der Waals ◽

Transition Metal Dichalcogenides ◽

Two Dimensional ◽

Van Der Waals Heterostructures ◽

Metal Dichalcogenides

Two-dimensional (2D) materials viz. transition metal dichalcogenides (TMD) and transition metal oxides (TMO) offer a platform that allows creation of heterostructures with a variety of properties. The optoelectronic industry has...

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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 ◽

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.

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Combined Healing and Doping of Transition Metal Dichalcogenides Through Molecular Functionalization

Journal of Materials Chemistry C ◽

10.1039/d1tc01329g ◽

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...

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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 ◽

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.

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Synthesis and characterisation of thin-film platinum disulfide and platinum sulfide

Nanoscale ◽

10.1039/d0nr06197b ◽

2021 ◽

Author(s):

Conor Patrick Cullen ◽

Cormac Ó Coileáin ◽

John B McManus ◽

Oliver Hartwig ◽

David McCloskey ◽

...

Keyword(s):

Thin Film ◽

Transition Metal ◽

2D Materials ◽

Transition Metal Dichalcogenides ◽

Metal Dichalcogenides ◽

Group 10

Group-10 transition metal dichalcogenides (TMDs) are rising in prominence within the highly innovative field of 2D materials. While PtS2 has been investigated for potential electronic applications, due to its high...

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2D Materials: Re Doping in 2D Transition Metal Dichalcogenides as a New Route to Tailor Structural Phases and Induced Magnetism (Adv. Mater. 43/2017)

Advanced Materials ◽

10.1002/adma.201770315 ◽

2017 ◽

Vol 29 (43) ◽

Author(s):

Vidya Kochat ◽

Amey Apte ◽

Jordan A. Hachtel ◽

Hiroyuki Kumazoe ◽

Aravind Krishnamoorthy ◽

...

Keyword(s):

Transition Metal ◽

2D Materials ◽

Transition Metal Dichalcogenides ◽

Metal Dichalcogenides

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Waterproof molecular monolayers stabilize 2D materials

Proceedings of the National Academy of Sciences ◽

10.1073/pnas.1909500116 ◽

2019 ◽

Vol 116 (42) ◽

pp. 20844-20849 ◽

Cited By ~ 4

Author(s):

Cong Su ◽

Zongyou Yin ◽

Qing-Bo Yan ◽

Zegao Wang ◽

Hongtao Lin ◽

...

Keyword(s):

Transition Metal ◽

Theoretical Analysis ◽

2D Materials ◽

Transition Metal Dichalcogenides ◽

Water Molecules ◽

Two Dimensional ◽

Ambient Conditions ◽

Molecular Monolayers ◽

Metal Dichalcogenides ◽

Van Der Waals Materials

Two-dimensional van der Waals materials have rich and unique functional properties, but many are susceptible to corrosion under ambient conditions. Here we show that linear alkylamines n-CmH2m+1NH2, with m = 4 through 11, are highly effective in protecting the optoelectronic properties of these materials, such as black phosphorus (BP) and transition-metal dichalcogenides (TMDs: WS2, 1T′-MoTe2, WTe2, WSe2, TaS2, and NbSe2). As a representative example, n-hexylamine (m = 6) can be applied in the form of thin molecular monolayers on BP flakes with less than 2-nm thickness and can prolong BP’s lifetime from a few hours to several weeks and even months in ambient environments. Characterizations combined with our theoretical analysis show that the thin monolayers selectively sift out water molecules, forming a drying layer to achieve the passivation of the protected 2D materials. The monolayer coating is also stable in air, H2 annealing, and organic solvents, but can be removed by certain organic acids.

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

Materials ◽

10.3390/ma14195843 ◽

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.

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Tailorable multifunctionalities in ultrathin 2D Bi-based layered supercell structures

Nanoscale ◽

10.1039/d1nr04975e ◽

2021 ◽

Author(s):

Zihao He ◽

Xingyao Gao ◽

Di Zhang ◽

Ping Lu ◽

Xuejing Wang ◽

...

Keyword(s):

Transition Metal ◽

2D Materials ◽

Transition Metal Dichalcogenides ◽

Ferromagnetic Behavior ◽

Two Dimensional ◽

Next Generation ◽

Layered Oxide ◽

Nanoelectronic Devices ◽

Potential Applications ◽

Metal Dichalcogenides

Two-dimensional (2D) materials with robust ferromagnetic behavior have attracted great interest because of their potential applications in next-generation nanoelectronic devices. Aside from graphene and transition metal dichalcogenides, Bi-based layered oxide...

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