Two dimensional (2D) van der Waals (vdW) materials have demonstrated fascinating optical, electrical and thickness-dependent characteristics. These been explored by numerous authors but reports on magnetic properties spintronic applications of 2D vdW are scarce comparison. By performing anomalous Hall effect transport measurements, we characterised the thickness dependent single crystalline Fe3GeTe2. The nanoflakes this metallic material exhibit a hard phase with near square-shaped loop,...

Stretchable and transparent electronics have steadily attracted huge attention in wearable devices. Although Ag nanowire is the one of most promising candidates for stretchable electronics, its electrochemical instability has forbidden application to development energy devices such as supercapacitors. Here, we introduce a highly supercapacitor based on electrochemically stable Ag-Au core-shell percolation network electrode. We developed simple solution process synthesize with excellent...

By plasma-enhanced chemical vapor deposition, a molybdenum disulfide (MoS2 ) thin film is synthesized directly on wafer-scale plastic substrate at below 300 °C. The carrier mobility of the films 3.74 cm(2) V(-1) s(-1) . Also, humidity successfully detected with MoS2 -based sensors fabricated flexible substrate, which reveals its potential for sensing devices.

The electrical properties of two-dimensional atomic sheets exhibit remarkable dependences on layer thickness and surface chemistry. Here, we investigated the variation work function MoS2 films prepared with chemical vapor deposition (CVD) SiO2 substrates number film layers. Wafer-scale CVD 2, 4, 12 layers were fabricated SiO2, their evaluated by using Raman photoluminescence spectroscopies. In accordance our X-ray photoelectron spectroscopy results, Kelvin probe force microscopy...

Crystallographic direction of black phosphorus can be determined from polarized optical microscopy and Raman spectroscopy.

We describe a method for synthesizing large-area and uniform molybdenum disulfide films, with control over the layer number, on insulating substrates using gas phase sulfuric precursor (H2S) metal source. The thickness was varied to effectively number of layers (2 12) present in synthesized film. films were grown wafer-scale Si/SiO2 or quartz displayed excellent uniformity high crystallinity entire area. Thin film transistors prepared these materials, performances devices tested. an on/off...

We studied the surface-enhanced Raman scattering of an organic fluoropore (Rhodamine 6G, R6G) monolayer adsorbed onto graphene and two-dimensional (2D) molybedenium disulfides (MoS2) phototransistors compared results with R6G on 2D tungsten diselenides system (WSe2). The enhancement factor film WSe2 was comparable to corresponding value at 1365 cm–1 approximately twice this 615 cm–1. amplitude charge transfer estimated in situ by measuring photocurrent produced a hybrid consisting...

Atomically thin binary 2-dimensional (2D) semiconductors exhibit diverse physical properties depending on their composition, structure and thickness. By adding another element in those materials, which will lead to formation of ternary 2D the property would greatly change significantly expanded applications could be explored. In this work, we report structural optical atomically chromium thiophosphate (CrPS4), a antiferromagnetic semiconductor. Its details were revealed by X-ray electron...

The magnetic domains in two-dimensional layered material $\mathrm{F}{\mathrm{e}}_{3}\mathrm{GeT}{\mathrm{e}}_{2}$ are studied by using a variable-temperature scanning tunneling microscope with tip after situ cleaving of single crystals. A stripy domain structure is revealed zero-field-cooled sample below the ferromagnetic transition temperature 205 K, which replaced separate double-walled and bubble when cooling under field Ni tip. can further convert to pattern as well move Neel-type chiral...

We investigated the optical properties of ultrathin MoS2 films (number layers: N = 1, 2, 4, and 12) using Raman spectroscopy, photoluminescence (PL) spectroscopic ellipsometry. estimated layer thicknesses based on spectra. characterized microstructural a single-layer film atomic force microscopy. measured lowest-energy A B excitons PL spectroscopy. ellipsometric angles (Ψ Δ) thin ellipsometry, obtained dielectric functions as films' thickness changed from single to multi-layers. determined...

A flexible all-solid-state supercapacitor was demonstrated with a Ag nanoparticle current collector prepared by an R2R printed and laser annealing process.

Chemical transformation of existing two-dimensional (2D) materials can be crucial in further expanding the 2D crystal palette required to realize various functional heterostructures. In this work, we demonstrate a 'on-stack' chemical conversion single-layer crystalline MoS2 into MoO3 with precise layer control that enables truly and MoO3/MoS2 To minimize perturbation morphology, nonthermal oxidation using O2 plasma was employed. The early stage reaction characterized by defect-induced Raman...

Among two-dimensional (2D) layered van der Waals materials, ferromagnetic 2D materials can be useful for compact low-power spintronic applications. One promising candidate material is Fe3GeTe2 (FGT), which has a strong perpendicular magnetic anisotropy and relatively high Curie temperature. In this study, we confirmed that an oxide layer (O-FGT) naturally forms on top of exfoliated FGT antiferromagnetic coupling (AFC) exists between O-FGT layers. From first-principles calculation, formation...

Large-area NbS₂ films have been synthesized by using the chemical vapor deposition method and exhibited their potential as transparent electrodes for 2D semiconductor devices.

An ultraclean method to directly transfer a large-area MoS2 film from the original growth substrate flexible by using epoxy glue is developed. The transferred observed be free of wrinkles and cracks as smooth synthesized on substrate.

We herein developed an ultrasensitive and rapid strategy to identify genomic nucleic acids by integrating a clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated protein 13a (Cas13a) into our recently isothermal technique, nicking extension chain reaction system-based amplification (NESBA) reaction. In this named CESBA, the NESBA isothermally produces large amount of RNA amplicons from initial target (gRNA). The bind crispr (crRNA) activate collateral cleavage...

We develop a digital direct writing method for ZnO NW micro-patterned growth on large scale by selective laser decomposition of zinc acetate. For growth, replacing the bulk heating with scanning focused as fully local heat source, acetate crystallites can be selectively activated seed pattern to grow nanowires locally larger area. Together sintering process metal nanoparticles, more than 10 000 UV sensors have been demonstrated 4 cm × glass substrate all-solution processible, all-laser...

Many two-dimensional (2D) semiconductors represented by transition metal dichalcogenides have tunable optical bandgaps in the visible or near IR-range standing as a promising candidate for optoelectronic devices. Despite this potential, however, their photoreactions are not well understood controversial mechanistic details. In work, we report unique thickness-dependent photoreaction sensitivity and switchover between two competing reaction mechanisms atomically thin chromium thiophosphate...

Two-dimensional (2D) magnetic materials have attracted much recent interest with unique properties emerging at the few-layer limit. Beyond reported impacts on static properties, effects of reducing dimensionality magnetization dynamics are also fundamental and importance for 2D device development. In this report, we investigate spin in atomically-thin antiferromagnetic FePS3 varying layer numbers using ultrafast pump-probe spectroscopy. Following absorption an optical pump pulse, time...

We performed first-principles calculations to investigate the magnetic, mechanical and electronic properties of tetrachalcogenide CrPS4. Although bulk CrPS4 has been shown exhibit a low-dimensional antiferromagnetic (AFM) ground state where ferromagnetic (FM) Cr-chains are coupled antiferromagnetically, our indicated that monolayer can be transformed an FM material by applying uniaxial tensile strain ⩾4% along Cr-chain direction. The AFM-to-FM transition is explained driven increase exchange...