Themed collection 2D Materials: Explorations Beyond Graphene

Dye-sensitized solar cell using counter electrode based on transition metal dichalcogenides.

During the past few years, two-dimensional (2D) layered materials have emerged as the most fundamental building blocks of a wide variety of optoelectronic devices.

In recent years, two-dimensional atomic-level thickness crystal materials have attracted widespread interest such as graphene, hexagonal boron nitride (h-BN), silicene, germanium, black phosphorus (BP), transition metal sulfides and so on.

Carbon materials are widely used for adsorptive removal of corrosive or green-house gases like SO₂ or CO₂. Graphene oxide is accessible in bulk quantities and thus may represent a viable replacement for other nanostructured carbon materials.

C₂N₆S₃ sustains a biaxial tensile strain up to 24% and its Fermi velocity can be tuned by biaxial strain.

The surfactant (sodium cholate) when used in the liquid exfoliation of 2D-MoS₂ has a detrimental effect upon its electrocatalytic activity compared to pristine 2D-MoS₂ (produced without a surfactant).

One-step synthesized graphene covered three-dimensionally structured architectures are found to be able current collectors in improving the performance of electrodes used in Li ion battery systems.

Bose–Einstein oscillators contribute to the anomalous temperature variation of the free-exciton emission energy in 2D layered CH₃(CH₂)₃NH₃PbI₄ perovskite, in which coherent two-photon absorption results in the two-photon photoluminescence.

As a new kind of two-dimensional (2D) material, black phosphorus (BP) has attracted explosive interest in biomedical applications.

The flexible and free-standing paper electrode with ultrahigh volumetric performance and outstanding stability was prepared based on the layered 2D Ti₃C₂T_x, which demonstrates the potential applications in small-sized electronic devices.

The electronic properties of an MoS₂ and graphene heterostructure are investigated by density functional calculations.

Graphene and MoS₂, with their structural and morphological compatibility, can be well integrated to make new hybrid materials with enhanced catalytic properties, including the photodegradation of organic pollutants.

We constructed a MoS₂ quantum dots (QDs) decorated g-C₃N₄ composite photocatalyst via a simple impregnation method for H₂ evolution.

A graphitic C₃N₄ nanosheet with well-ordered sized intrinsic vacancies provides a natural porous diffusion pathway to separate H₂ from common gases.

Boron nitride/graphene oxide hybrids prepared by an electrostatic self-assembly strategy were used as fillers for epoxy composites with high thermal conductivity.

Formation of a thermal conductive network in resin sheet hybridized cellulose/BN core–shell microbeads.

Graphene band gap opening is achieved when integrated with C₂N. C₂N/graphene heterostructures are promising materials for FETs and water splitting.

A honeycomb-like structured polyaniline/MoS₂ nanocomposite has been prepared by self-stabilized dispersion polymerization, which exhibits enhanced electrochemical performances with high electrical conductivity.

The metallicity, high capacities, fast diffusion and low average intercalation potentials make Nb₂C monolayer a promising LIBs/NLIBs anode.

A doping technique achieved remarkable success in improving the electrical and semiconductor-to-metal transitions characteristics of WS₂ FET.

Hexagonal boron nitride micro particles functionalized by γ-MPS, were used to fabricate PI/BN composites. The thermal conductivity of the composites with 40 wt% m-BN content was increased to 0.748 W m⁻¹ K⁻¹, 4.5 times higher than that of the pure PI.

The electronic and magnetic properties of n- and p-type impurities by means of group V and VII atoms substituting sulfur in a MoS₂ monolayer were investigated using first-principles methods based on density functional theory.

The replacement of Pt with cheap metal electrocatalysts with high efficiency and superior stability for the hydrogen evolution reaction (HER) remains a great challenge.

Three dimensional scaffolds of hBN microplatelets prepared by ice templating method are used to fabricate hBN/PDMS composites with vertically aligned hBN for thermal interface materials.

Here, we introduce tetrathiafulvalene and tetracyanoquinodimethane to antimonene, monolayer antimony, as electron and hole dopants to attain n- and p-type semiconductors.

MoS₂ ultrathin nanosheets display excellent adsorption ability towards methylene blue, with a maximum adsorption capacity of 146.43 mg g⁻¹ in 300 seconds. Moreover, the adsorbent can be resued by washing with deionized water.

The electronic and optical properties of phosphorene co-doped with vanadium and non-metallic atoms (B, C, N and O) are investigated by employing first-principles calculations based on density functional theory.

Highly porous Co₃O₄ nanobelts were successfully synthesized by using a hydrothermal technique, followed by calcination of the Co(OH)₂ precursor.

Properties of hexagonal boron nitride bilayer related to interlayer interaction (width and formation energy of dislocations, shear mode frequency, etc.) are estimated by approximation of potential energy surface by first Fourier harmonics.

Our work shows that the thermal conductivity κ of MoS₂ is largest among the three materials (Fig. a and b) due to largest Debye temperature. WS₂ has stronger bonding (Fig. e) and lower anharmonicity (Fig. h), leading to a much larger κ compared to MoSe₂.

Spiral and pyramidal WS₂ domains controllably synthesized through chemical vapour deposition technique exhibit interesting optical properties.

Nanosheet-assembled tube-like hierarchical MoSe₂/CoSe₂ microcages, synthesized via a facile one-pot hydrothermal method, show enhanced HER activity with a much lower onset overpotential, larger cathodic current, and a smaller Tafel slope.

Heterogenization of homogenous oxidative desulfurization reaction on graphene-like BN with a novel peroxomolybdate ionic liquid.