A5102735415- 2D Materials and Applications
- MXene and MAX Phase Materials
- Graphene research and applications
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Electrospun Nanofibers in Biomedical Applications
- Advanced Photocatalysis Techniques
- Electrocatalysts for Energy Conversion
- Organic and Molecular Conductors Research
- Molecular Junctions and Nanostructures
- Graphene and Nanomaterials Applications
- Theoretical and Computational Physics
- Advanced Battery Technologies Research
- Perovskite Materials and Applications
- Silk-based biomaterials and applications
- Magnetic properties of thin films
- Electrochemical Analysis and Applications
- Polymer Surface Interaction Studies
- Conducting polymers and applications
- Physics of Superconductivity and Magnetism
- Oral health in cancer treatment
- Advanced Chemical Physics Studies
- Electrochemical sensors and biosensors
Sungkyunkwan University
2004-2024
Government of the Republic of Korea
2018
Suwon Research Institute
2018
Kangbuk Samsung Hospital
2004
Kyung Hee University
2004
A novel one‐dimensional (1D) inorganic material, Nb 2 Se 9 , which can be separated into atomic‐level, is synthesized through chemical reaction between and sources. crystals are formed under an excess condition to avoid other phase such as NbSe 3 the residual removed by heat treatment; thus, high‐purity obtained. The one‐atom‐thick level nanochains successfully obtained mechanical exfoliation dispersion in a solvent. covalently bonded chain, when isolated from its three‐dimensional bulk...
Abstract In this work, high‐quality 1D van der Waals (vdW) Nb 2 Pd 3 Se 8 is synthesized, showing an excellent scalability from bulk to single‐ribbon due weakly bonded repeating unit ribbons. The calculation of electronic band structures confirmed that novel a semiconducting material, displaying indirect‐to‐direct bandgap transition with decreasing the number unit‐ribbons single. Field effect transistors (FETs) fabricated on mechanically exfoliated nanowires exhibit n‐type transport...
1D vdW Nb 2 Se 9 is a promising advanced anode material for LIBs due to superior electrochemical performance originating from its unique structural properties, which allow swift transport of Li ions and buffer the volume changes during Li-ion storage.
The synthesis and dispersion of a new one-dimensional (1D) material, V<sub>2</sub>Se<sub>9</sub>, in which chain-shaped molecular units with strong covalent bonds are assembled crystal structure <italic>via</italic> weak van der Waals attraction between chains, were carried out.
Mass production of one-dimensional, V₂Se₉ crystals, was successfully synthesized using the solid-state reaction vanadium and selenium. Through mechanical exfoliation method, bulk crystal easily separated to nanoribbon structure we have confirmed that as-grown crystals consist innumerable single chains linked by van der Waals interaction. The exfoliated flakes can be controlled thickness repeated-peeling method. In addition, atomic thick also obtained on a 300 nm SiO₂/Si substrate. Scanning...
As Mo3Se3– chain nanowires have dimensions comparable to those of natural hydrogel chains (molecular-level diameters ∼0.6 nm and lengths several micrometers) excellent mechanical strength flexibility, they large potential reinforce hydrogels improve their properties. When a Mo3Se3–-chain-nanowire-gelatin composite is prepared simply by mixing with gelatin, phase separation the from gelatin matrix occurs in micronetwork, providing only small improvements In contrast, when surface nanowire...
Abstract Low-temperature-processed semiconductors are an emerging need for next-generation scalable electronics, and these to feature large-area fabrication, solution processability, high electrical performance, wide spectral optical absorption properties. Although various strategies of low-temperature-processed n-type have been achieved, the development high-performance p-type at low temperature is still limited. Here, we report a unique method synthesize tellurium nanowire networks...
Materials with physicochemical properties and biological activities similar to those of the natural extracellular matrix are in high demand tissue engineering. In particular, Mo3 Se3- inorganic molecular wire (IMW) is a promising material composed bioessential minerals possess nanometer-scale diameters, negatively charged surfaces, physical flexibility, nanotopography characteristics, which essential for interactions cell membrane proteins. Here, an implantable 3D IMW enhanced...
The optimum solvent for Nb2Se9 dispersion, which is a new type of one dimensional (1D) material, investigated. Among several solvents (16 in total), strong dispersion was observed benzyl alcohol, isopropyl isobutyl and diacetone have medium dielectric constants the range 10 to 30 surface tension 25 35 mJ m−2. 1D chains, whose size less than nm, are well dispersed it possible disperse mono-chains 1 nm or specific region. unit chain with dangling bond free high volume area ratio expected be...
A novel semiconductor 1D nanomaterial, Nb2Se9, was synthesized on a bulk scale via simple vapor transport reaction between niobium and selenium. Needle-like single crystal Nb2Se9 contains numerous chains linked by van der Waals interactions, we confirmed that bundle of can be easily separated mechanical cleavage. The exfoliated flakes exhibit quasi-two-dimensional layered structure, the number layers controlled using repeated-peeling method. work function varied depending thickness as...
Abstract In this study, high‐purity and centimeter‐scale bulk Ta 2 Ni 3 Se 8 crystals are obtained by controlling the growth temperature stoichiometric ratio between tantalum, nickel, selenium. It is demonstrated that could be effectively exfoliated into a few chain‐scale nanowires through simple mechanical exfoliation liquid‐phase exfoliation. Also, calculation of electronic band structures confirms semiconducting material with small bandgap. A field‐effect transistor successfully...
Layered two‐dimensional (2D) transition metal dichalcogenides (TMDCs) often form 2D sheets and some of these show an indirect to direct band gap as the number layers decreases from that bulk structure. Recently, a new one‐dimensional (1D) material Nb 2 Se 9 is successfully prepared by solid state reaction. This semiconducting composed periodically stacked single‐chain atomic crystals (SCAC) where SCACs inorganic due strong bonds within chain but with weak inter‐chain interactions. To...
In recent years, one-dimensional (1D) transition-metal chalcogenide nanowires have been considered as potential candidates to replace noble-metal-based electrocatalyst in water electrolysis because they exhibit high surface area and plenty of exposed chalcogen atoms act active sites. Herein, we report the fabrication noble-metal-free selenium-rich 1D single-chain niobium selenide (Nb2Se9) for efficient hydrogen evolution reaction (HER). The Nb2Se9 is simply prepared by filtration dispersed...
Centimeter‐size single‐crystalline Nb 3 I 8 , a new family of two‐dimensional materials, is first synthesized by vapor transport reaction niobium and iodine. Through the mechanical exfoliation method, bulk crystal cleaved to monolayer multi‐layered flakes. It confirmed consist numerous monolayers bonded weak van der Waals interaction. By utilizing atomic force microscopy (AFM) scanning Kelvin probe (SKPM), information on structure electrical properties obtained at same time. The analysis...
We studied the optimum dispersion solvent for bulk V2Se9 material, which can be used as a new one-dimensional (1D) to separate into 1D chain units. Selected twelve solvents, have different dielectric constants and surface tensions, were tested exfoliate nano-scale chains. The atomic level (∼1 nm, mono-chain) exfoliation of was performed using acetone solvent. concentration high in solvents having medium ranging from 20 40 with tensions 25 35 mJ m-2. This result is similar results previous...
Recently, ternary transition metal chalcogenides Ta2X3Se8 (X = Pd or Pt) have attracted great interest as a class of emerging one-dimensional (1D) van der Waals (vdW) materials. In particular, Ta2Pd3Se8 has been actively studied owing to its excellent charge transport properties an n-type semiconductor and ultralong ballistic phonon properties. Compared subsequent studies on the Pd-containing material, Ta2Pt3Se8, another member this materials considerably less explored despite promising...
We studied dispersants for exfoliating bulk V<sub>2</sub>Se<sub>9</sub> into one dimensional chain units.
Needle-like single crystalline wires of TaSe3 were massively synthesized using the chemical vapor transport method. Since wedged-shaped molecular chains stacked along b-axis by weak van der Waals interactions, a few layers flakes could be easily isolated typical mechanical exfoliation The exfoliated had an anisotropic planar structure, and number controlled repeated peeling process until monolayer nanoribbon was obtained. Through atomic force scanning Kelvin probe microscope analyses, it...
Finding new materials with satisfying all the desired criteria for nanodevices is an extremely difficult work. Here, we introduce a novel Nb2Se9 material as promising candidate, capable of overcoming some physical limitations, such suitable band gap, high carrier mobility, and chemical stability. Unlike graphene, it has noticeable gap no dangling bonds at surfaces that deteriorate transport properties, owing to its molecular chain structure. Using density functional theory (DFT) calculations...
The enlargement of the Stern layer distance caused by this ion exchange improves dispersibility (Mo<sub>3</sub>Se<sub>3</sub><sup>−</sup>)<sub>∞</sub> chains and also prevents re-bundling aggregation nanowires in aqueous solutions, even at high concentrations (1 mg mL<sup>−1</sup>).