摘要:
According to example embodiments, a two-dimensional (2D) material element may include a first 2D material and a second 2D material chemically bonded to each other. The first 2D material may include a first metal chalcogenide-based material. The second 2D material may include a second metal chalcogenide-based material. The second 2D material may be bonded to a side of the first 2D material. The 2D material element may have a PN junction structure. The 2D material element may include a plurality of 2D materials with different band gaps.
摘要:
Reagent complexes have two or more elements, formally in oxidation state zero, complexed with a hydride molecule. Complexation with the hydride molecule may be evidenced by shifts to lower binding energies, of one or more electrons in each of the two or more elements, as observed by x-ray photoelectron spectroscopy. The reagents can be useful for the synthesis of multi-element nanoparticles. Preparation of the reagents can be achieved by ball-milling a mixture that includes powders of two or more elements and a hydride molecule.
摘要:
The present invention provides a heat treatment method, particularly a heat treatment method in which a protective layer is directly applied onto a precursor to ensure that the precursor on each portion of the substrate is treated based on substantially the same conditions so that the quality of the prepared product layer is improved. The method of the present invention comprises: (1) providing a substrate; (2) applying a precursor onto the surface of the substrate; (3) covering the precursor-applied substrate with a protective layer to bring the substrate and the protective layer into direct contact; (4) placing the substrate obtained from step (3) into a heat chamber for heat treatment; and (5) removing the protective layer. A product prepared by said heat treatment method is also provided.
摘要:
A process for exfoliating untreated 3-dimensional material to produce a 2-dimensional material, said process comprising the steps of mixing the untreated 3-dimensional material in a liquid to provide a mixture; applying shear force to said mixture to exfoliate the 3-dimensional material and produce dispersed exfoliated 2-dimensional material in solution; and removing the shear force applied to said mixture, such that the dispersed exfoliated 2-dimensional material remains free and unaggregated in solution.
摘要:
Disclosed herein is a method of purifying and doping a population of semiconductor nanocrystals. The method includes mixing the population of semiconductor nanocrystals having a first material system and a first ligand with a set of particles in the presence of a first solvent, the set of particles having a second material system which is different from the first material system and a second ligand which is different from the first ligand, to form a mixture. The method also includes facilitating a ligand exchange and an ionic exchange in the mixture, altering the first material system of the population of semiconductor nanocrystals to a third material system, different from the first material system and the second material system. The method includes sonicating the mixture and isolating the population of semiconductor nanocrystals having the third material system and the second ligand from the mixture.
摘要:
An electrically conductive thin film including a compound represented by Chemical Formula 1 or Chemical Formula 2 and having a layered crystal structure: M1Te2 Chemical Formula 1 wherein M1 is titanium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V), tantalum (Ta), or niobium (Nb); and M2Se2 Chemical Formula 2 wherein M2 is vanadium (V) or tantalum (Ta).
摘要:
This disclosure concerns a method of making nanowires in a single flask and in non-coordinating solvent involving the reaction of PbO with oleic acid to produce Pb oleate, heating the Pb oleate to a preferred temperature with additional coordinating ligands, injecting a solution of Se to produce a second solution, heating the second solution, and maintaining the temperature, resulting in nucleation and growth of PbSe nanowires.
摘要:
The present invention provides a method for the preparation of low-dimensional materials, comprising mixing a pristine material to be abraded with an organic solvent to form a mixture, abrading the material to be abraded by bead-milling, obtaining a suspension comprising the material of low dimension and the organic solvent, and removing the organic solvent from the suspension to obtain the low-dimensional material.
摘要:
A method for making semiconductor nanocrystals is disclosed, the method comprising adding a secondary phosphine chalcogenide to a solution including a metal source and a liquid medium at a reaction temperature to form a reaction product comprising a semiconductor comprising a metal and a chalcogen, and quenching the reaction mixture to form quantum dots. Methods for overcoating are also disclosed. Semiconductor nanocrystals are also disclosed.
摘要:
The present invention provides a method of exfoliating a layered material (e.g., transition metal dichalcogenide) to produce nano-scaled platelets having a thickness smaller than 100 nm, typically smaller than 10 nm. The method comprises (a) dispersing particles of a non-graphite laminar compound in a liquid medium containing therein a surfactant or dispersing agent to obtain a stable suspension or slurry; and (b) exposing the suspension or slurry to ultrasonic waves at an energy level for a sufficient length of time to produce separated nano-scaled platelets. The nano-scaled platelets are candidate reinforcement fillers for polymer nanocomposites.