Strategy for Enhancing Catalytic Active Site: Introduction of 1D material InSeI for Electrochemical CO Reduction to Formate.

The presence of oxygen vacancies (V) in electrocatalysts plays a significant role in improving the selectivity and activity of CO reduction reaction (CORR). In this study, 1D material with large surface area is utilized to enable uniform V formation on the catalyst. 1D structured indium selenoiodide (InSeI) is synthesized and used as an electrocatalyst for the conversion of CO to formate.

Unprecedented Hole Concentration of NiSe Electrodes Leading to Hole Degeneration of Entire WSe Channels.

Semimetal electrodes for 2D semiconductors have been extensively studied; however, research on p-type semimetals has been limited due to the scarcity of materials that satisfy both high work functions and low resistances. In response, we investigated the behavior of NiSe as an electrode. Utilizing a novel co-evaporation method that suppresses oxidation and contamination, we synthesized NiSe demonstrating a high work function of 5.

Scalable Fabrication of Quasi-One-Dimensional van der Waals TaPtSe Nanowire Thin Films via Solution Processing for NO Gas Sensing over Large Areas.

Solution-based processing of van der Waals (vdW) one- (1D) and two-dimensional (2D) materials is an effective strategy to obtain high-quality molecular chains or atomic sheets in a large area with scalability. In this work, quasi-1D vdW TaPtSe was exfoliated via liquid phase exfoliation (LPE) to produce a stably dispersed TaPtSe nanowire solution. In order to screen the optimal exfoliation solvent, nine different solvents were employed with different total surface tensions and polar/dispersive (P/D) component (P/D) ratios.

Colloidal Synthesis of Ultrathin and Se-Rich VSe Nanobelts as High-Performance Anode Materials for Li-Ion Batteries.

In this study, the one-dimensional (1D) material VSe was successfully synthesized using a colloidal method with VO(acac) and Se powder as precursors in a 1-octadecene solvent. The obtained colloidally synthesized VSe (C-VSe) has an ultrathin nanobelt shape and a 4.5 times higher surface area compared with the bulk VSe, which is synthesized in a solid-state reaction as previously reported.

Controlled Bipolar Doping of One-Dimensional van der Waals NbPdSe.

Tailoring the electrical properties of one-dimensional (1D) van der Waals (vdW) materials is desirable for their applications toward electronic devices by exploiting their unique characteristics. However, 1D vdW materials have not been extensively investigated for modulation of their electrical properties. Here we control doping levels and types of 1D vdW NbPdSe over a wide energy range by immersion in AuCl or β-nicotinamide adenine dinucleotide (NADH) solutions, respectively.

Colloidal synthesis of 1-D van der Waals material NbSe: study of synergism of coordinating agent in a co-solvent system.

Low-dimensional NbSe nanocrystals were synthesised through a simple one-pot colloidal synthesis with C18 organic solvents (octadecane, oleylalcohol, octadecanethiol, octadecene (ODE), and oleylamine (OLA)) of varied terminal functional groups. The solvent with high reducing power facilitated the nucleation of the nanoparticle, lowering threshold concentration and broadening the concentration spectrum. As a solvent, reducing agent, and capping agent, ODE functions as a primary factor in the synthesis of high-quality NbSe nanorods.

Novel High Current-Carrying Quasi-1D Material: Nb PdS.

A quasi-one-dimensional van der Waals metallic nanowire Nb PdS is synthesized, and its electrical characteristics are analyzed. The chemical vapor transport method is applied to produce centimeter-scale Nb PdS crystals with needle-like structures and X-ray diffraction (XRD) confirms their high crystallinity. Scanning transmission electron microscopy reveals the crystal orientation and atomic arrangement of the specific region with atomic resolution.

Ultrahigh-Porosity MgO Microparticles for Heat-Energy Storage.

Continuous industrial development has increased the demand of energy. Inevitably, the development of energy sources is steadily progressing using various methods. Rather than establishing a new energy source, a system for storing waste heat generated by industry has now been accepted as a useful strategy.

Liquid Precursor-Assisted Chemical Vapor Deposition of One-Dimensional van der Waals Material NbSe: Tunable Growth for Room-Temperature Gas Sensors.

In this study, NbSe, a one-dimensional (1D) material with van der Waals (vdWs) bonding, was synthesized by chemical vapor deposition (CVD). A liquid precursor was used to overcome the difficulty of controlling the length and density of NbSe by CVD due to the high melting point of Nb. Growth proceeded horizontally in a nano-ribbon shape on the substrate in the [100] direction, which had the most stable bonding distance, resulting in a preferred orientation of the (010) plane on the out-of-plane axis.

Organic Dispersion of MoSe Single-Chain Atomic Crystals Using Surface Modification Methods.

In this study, single-chain atomic crystals (SCACs), MoSe, which can be uniformly dispersed, with an atomically thin diameter of ∼0.6 nm were modified to disperse in an organic solvent. Various surfactants were chosen to provide steric hindrance to aqueous-dispersed MoSe by modifying the surface of MoSe.

Transparent and Flexible Electromagnetic Interference Shielding Film Using ITO Nanobranches by Internal Scattering.

A transparent and flexible film capable of shielding electromagnetic waves over a wide range of frequencies (X and K bands, 8-18 GHz) is prepared. The electromagnetic wave shielding film is fabricated using the excellent transmittance, electrical conductivity, and thermal stability of indium tin oxide (ITO), a representative transparent conductive oxide. The inherent mechanical brittleness of oxide ceramics is overcome by adopting a nanobranched structure.

High Breakdown Current Density in Quasi-1D van der Waals Layered Material TaNiSe.

We synthesized ternary composition chalcogenide TaNiSe, a quasi-one-dimensional (Q1D) material with excellent crystallinity. To utilize the excellent electrical conductivity property of TaNiSe, the breakdown current density () according to thickness change through mechanical exfoliation was measured. It was confirmed that as the thickness decreased, the maximum breakdown voltage () increased, and at 18 nm thickness, 35 MA cm of was measured, which was 35 times higher than that of copper, which is commonly used as an interconnect material.

One-dimensional van der Waals stacked p-type crystal TaPtSe for nanoscale electronics.

Recently, ternary transition metal chalcogenides TaXSe (X = Pd or Pt) have attracted great interest as a class of emerging one-dimensional (1D) van der Waals (vdW) materials. In particular, TaPdSe has been actively studied owing to its excellent charge transport properties as an n-type semiconductor and ultralong ballistic phonon transport properties. Compared to subsequent studies on the Pd-containing material, TaPtSe, another member of this class of materials has been considerably less explored despite its promising electrical properties as a p-type semiconductor.

Ta Ni Se : 1D van der Waals Material with Ambipolar Behavior.

In this study, high-purity and centimeter-scale bulk Ta Ni Se crystals are obtained by controlling the growth temperature and stoichiometric ratio between tantalum, nickel, and selenium. It is demonstrated that the bulk Ta Ni Se crystals could be effectively exfoliated into a few chain-scale nanowires through simple mechanical exfoliation and liquid-phase exfoliation. Also, the calculation of electronic band structures confirms that Ta Ni Se is a semiconducting material with a small bandgap.

A study on the bio-applicability of aqueous-dispersed van der Waals 1-D material NbSe using poloxamer.

In this research, dispersion of a new type of one-dimensional inorganic material NbSe, composed of van der Waals bonds, in aqueous solution for bio-application study were studied. To disperse NbSe, which exhibits hydrophobic properties in water, experiments were carried out using a block copolymer (poloxamer) as a dispersant. It was confirmed that PPO, the hydrophobic portion of Poloxamer, was adsorbed onto the surface of NbSe, and PEO, the hydrophilic portion, induced steric hinderance to disperse NbSe to a size of 10 nm or less.

Plasticized Polystyrene by Addition of -Diene Based Molecules for Defect-Less CVD Graphene Transfer.

Chemical vapor deposition of graphene on transition metals is the most favored method to get large scale homogenous graphene films to date. However, this method involves a very critical step of transferring as grown graphene to desired substrates. A sacrificial polymer film is used to provide mechanical and structural support to graphene, as it is detached from underlying metal substrate, but, the residue and cracks of the polymer film after the transfer process affects the properties of the graphene.

Abnormal dewetting of Ag layer on three-dimensional ITO branches to form spatial plasmonic nanoparticles for organic solar cells.

Three-dimensional (3D) plasmonic structures have attracted great attention because abnormal wetting behavior of plasmonic nanoparticles (NPs) on 3D nanostructure can enhance the localized surface plasmons (LSPs). However, previous 3D plasmonic nanostructures inherently had weak plasmonic light absorption, low electrical conductivity, and optical transmittance. Here, we fabricated a novel 3D plasmonic nanostructure composed of Ag NPs as the metal for strong LSPs and 3D nano-branched indium tin oxide (ITO BRs) as a transparent and conductive framework.

Aqueous Dispersion of One-Dimensional van der Waals Material MoSI with the Charge Type of the Hydrophobic Dispersant Tail.

Aqueous dispersion of van der Waals bonded one-dimensional materials MoSI with hydrophobic surfaces has been studied. The surface charge of the dispersed MoSI is controlled from negative to positive by the charge type of dispersant tail (anionic, SDS and NaDDBS; cationic, CTAB; nonionic, Poloxamer 407), and through this, it is possible to deposit the dispersed MoSI in nanosized by electrophoretic deposition at a desired position. When a flexible device was manufactured by transferring MoSI, it was confirmed that electrical conductivity can be measured in 40% of elongation and more than 1000 times cyclic test.