The controlled synthesis of large-area, atomically thin molybdenum ditelluride (MoTe2) crystals is crucial for its various applications based on the attractive properties this emerging material. In work, we developed a chemical vapor deposition to produce uniform, and highly crystalline few-layer 2H 1T' MoTe2 films. It was found that these two different phases can be grown depending choice Mo precursor. Because structure, as-grown films display electronic are comparable those mechanically...

Abstract Near infrared (NIR) photodetectors based on 2D materials are widely studied for their potential application in next generation sensing, thermal imaging, and optical communication. Construction of van der Waals (vdWs) heterostructure provides a tremendous degree freedom to combine extend the features materials, opening up new functionalities photonic optoelectronic devices. Herein, type‐II InSe/PdSe 2 vdWs with strong interlayer transition NIR photodetection is demonstrated. Strong...

Abstract Endowed with rich terminal groups, good electrical conductivity, and controllable structure, transition metal carbides/nitrides (MXenes) have attracted extensive attention for potential application in gas sensor, but long‐standing challenges of the MXenes (titanium carbide as representative) are their limited selectivity sensitivity. Herein, a high‐active double transition‐metal titanium molybdenum (Mo 2 TiC T x ) superstrong surface adsorption (−3.12 eV) NO molecule is proposed, it...

The electronic structure of graphene antidot lattices (GALs) with zigzag hole edges was studied first-principles calculations. It revealed that half the possible GAL patterns were unintentionally missed in usual construction models used earlier studies. With complete models, bandgap GALs sensitive to width W wall between neighboring holes. A nonzero opened hexagonal even W, while remained closed those odd W. Similar alternating gap opening/closing also demonstrated rhombohedral GALs....

High-quality large-area few-layer 1T' MoTe2 films with high homogeneity are synthesized by the controlled tellurization of MoO3 film. The Mo precursor plays a key role in determining quality and morphology . Furthermore, amount Te strongly influences phase growth method paves way toward scalable production -based applications.

Newly synthesized Janus transition-metal dichalcogenides MXY ($M=\mathrm{Mo}$, W; $X\ensuremath{\ne}Y=\mathrm{S}$, Se, Te) possess intrinsic Rashba spin splitting and out-of-plane dipole moment due to the breaking of mirror symmetry. Taking WSSe as an example, we present a first-principles investigation structural stability electronic properties mono-, bi-, multilayer MXY. Results show that S atoms contribute more than Se in valence-band maximum at $\mathrm{\ensuremath{\Gamma}}$ point, which...

Abstract 2D semiconductors have shown great potentials for ultra‐short channel field‐effect transistors (FETs) in next‐generation electronics. However, because of intractable surface states and interface barriers, it is challenging to realize high‐quality contacts with low contact resistances both p‐ n‐ FETs. Here, a graphene‐enhanced van der Waals (vdWs) integration approach demonstrated, which multi‐scale (nanometer centimeter scale) reliable (≈100% yield) metal transfer strategy...

Abstract MXene exhibits an excellent ion‐electron dual conduction mechanism, making it a promising candidate for bio‐interfacing electrodes. However, the exposed Ti atoms on flakes are prone to oxidation in air, leading serious degradation which impedes its application as bioelectronic materials. Herein, new thin film protected by reduced graphene oxide (rGO) (namely rGM), resulting air‐stable electrode with high charge transfer capability is reported. The protective layer rGO effectively...

Using the density functional theory, we have demonstrated chemical functionalization of semiconducting graphene nanoribbons (GNRs) with Stone-Wales (SW) defects by carboxyl (COOH) groups. It is found that geometrical structures and electronic properties GNRs changed significantly, electrical conductivity system could be considerably enhanced monoadsorption double adsorption COOH, which sensitively depends upon axial concentration SW COOH pairs (SWDCPs). With increase SWDCPs, would transform...

We performed density functional theory study on the electronic and magnetic properties of armchair MoS2 nanoribbons (AMoS2NR) with different edge hydrogenation. Although bare fully passivated AMoS2NRs are nonmagnetic semiconductors, it was found that hydrogenation in certain patterns can induce localized ferromagnetic state make become antiferromagnetic semiconductors or semiconductors. Electric field effects bandgap moment were investigated. Partial change a small-sized AMoS2NR from...

The synthesis of high-quality 2D MoTe2 with a desired phase on SiO2/Si substrate is crucial to its diverse applications. A side reaction Te the Si leading SiTe and Si2Te3 tends happen during growth, resulting in failure obtain MoTe2. It has been found that molecular sieves can adsorb silicon telluride byproducts eliminate influence chemical vapor deposition With help sieves, few-layer 1T′ be grown from MoOx precursor. Pure 2H regions centimeter-sized areas synthesized same piece obtained by...

Abstract Differing from its bulk counterparts, atomically thin two-dimensional transition metal dichalcogenides that show strong interaction with light are considered as new candidates for optoelectronic devices. Either physical or chemical strategies can be utilized to effectively tune the intrinsic electronic structures adopting applications. This review will focus on different tuning include physics principles, in situ experimental techniques, and application of various

Battery materials as emerging capacitive deionization electrodes for desalination have better salt removal capacities than traditional carbon-based materials. LiMn2O4, a widely used cathode material, is difficult to utilize electrode due its structural instability upon cycling and Mn dissolution in aqueous-based electrolytes. Herein, facile low-cost ball-milling routine was proposed prepare LiMn2O4 material with highly exposed (111) facets. The prepared exhibited relatively low of during...

The intrinsic anisotropy of NbSe2 provides a favorable prerequisite second harmonic generation (SHG) and rich possibilities for tailoring its nonlinear optical (NLO) properties. Here we report the highly efficient SHG mechanically exfoliated flakes. response changes with excitation wavelengths, layer thicknesses, polarizations laser. anisotropic further exhibits non-centrosymmetric crystal structure could effectively assign crystalline orientation Interestingly, although flakes tens...

Developing efficient oxygen evolution reaction (OER) and reduction (ORR) bifunctional electrocatalysts is attractive for rechargeable metal-air batteries. Meanwhile, single metal atoms embedded in 2D layered transition chalcogenides (TMDs) have become a very promising catalyst. Recently, many attentions been paid to the ReS

Using nonequilibrium Green's function in combination with the spin-polarized density functional theory, spin-dependent transport properties of boron and nitrogen doped zigzag graphene nanoribbons (ZGNRs) heterojunctions single or double edge-saturated hydrogen have been investigated. Our results show that perfect spin-filtering effect (100%), rectifying behavior negative differential resistance can be realized ZGNRs-based systems. And corresponding physical analysis has given.

In this research, we demonstrate the large spin and valley splittings in Janus monolayer WSSe brought by interaction with a magnetic substrate. The MnO(111) substrate plays role of ferromagnet since importance lies magnetism surface Mn atoms. responses both in-plane out-of-plane direction are investigated. It is indicated that splitting about 410 meV at $K$ ${K}^{\ensuremath{'}}$ points can be produced substrate, which positively correlated vertical moments addition, helical gap opened...

Two-dimensional (2D) magnets have raised enormous attention because of their stable long-range magnetic orders and anomalous physics at 2D limits. Spin glass states are normally discovered in disordered systems with spin frustration, which rarely found crystalline materials. Here, the chemical vapor-deposited rhombohedral Cr2Se3 nanosheets could be grown down to a thickness 1.9 nm, shown hard magnetism large coercivity 1.5 kOe exhibited thermal irreversibility. A state freezing temperature...

Monolayer $\mathrm{Cu}M{\mathrm{P}}_{2}{X}_{6}$ $(M=\mathrm{Cr},\mathrm{V};X=\mathrm{S},\mathrm{Se})$ has been attracting increasing attention due to the ferromagnetism derived from indirect exchange interaction between Cr (V) atoms and ferroelectricity originating spontaneous displacement of Cu atoms. Using first-principles calculations, we predicted intrinsic valley splittings anomalous Hall effect in monolayers. In addition, Berry curvature are independent orientation out plane (OOP)...

Molybdenum dioxide (MoO2) has attracted many interests due to its unique properties and potential applications. Here, we report the synthesis of high quality MoO2@MoS2 nanorods on c-sapphire substrates through an atmospheric pressure chemical vapor deposition (APCVD) approach. Optical microscopy (OM), cross-sectional scanning electron (SEM), high-resolution transmission (HRTEM), selected area diffraction (SAED), (grazing incidence) X-ray ((GI)XRD) measurements reveal that these MoO2 exhibit...

Abstract Two‐dimensional (2D), high‐temperature, half‐metal ferromagnetic semiconductors with large spin gap and topological band structures are highly desirable for novel nanoscale spintronic applications. A family of stable 2D honeycomb‐Kagome Cr 2 X 3 (X=O,S,Se) monolayers is proposed through first‐principles calculations. Buckled O a semiconductor out‐of‐plane magnetocrystalline anisotropy energy predicted Curie temperature 332 K under moderate biaxial tensile strain. Planar S Se...