Preparation method of graphite alkene like tungsten disulfide nanometer sheet

Abstract

The invention discloses a preparation method of graphite alkene like tungsten disulfide nanometer sheet, which employs a high temperature solid phase synthesis method, and the method comprises the following steps: mixing thiourea and WO3 according to mol ratio 20:1-41:1 and fully grinding, and containing the grinded powder into a porcelain boat; heating a tubular furnace to 800-900 DEG C and letting nitrogen in; quickly pushing the porcelain boat into a central heat zone position of the tubular furnace and processing for 30-60 min at constant temperature; then, the mixture is naturally cooled to room temperature, and the graphite alkene like tungsten disulfide nanometer sheet is obtained. The invention has the advantages of simple technology and low cost, and the obtained product has high purity and yield, and is hopeful to be used in large scale industrial production.

Description

Technical field [0001] The present invention relates to the inorganic material tungsten disulfide (WS 2 ), specifically the preparation method of graphene-like tungsten disulfide nanosheets. Background technique [0002] Graphene, as a two-dimensional nanomaterial with only a single layer of carbon atoms in thickness and a hexagonal honeycomb lattice, is a two-dimensional nanomaterial. Because of its unique electrical behavior and extremely high specific surface area, it has become the next fullerene and carbon nanotube. Later, a member of the elemental carbon family that has been widely concerned; graphene is a typical two-dimensional nanostructure system, its thickness is on the atomic scale, but the plane diameter can reach sub-millimeter and above, and its two-dimensional scale is highly anisotropic. The confinement effect and surface effect make this single-layer elemental carbon material exhibit completely different electrical behavior, mechanical properties, optical and th...

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Problems solved by technology

[0003] Graphene-like tungsten disulfide is a two-dimensional crystal material with a "sandwich sandwich" layered structure composed of a single or multiple layers of hexagonal tungsten disulfide: a single layer of tungsten disulfide consists of three atomic layers, and the middle one The upper and lower layers are sulfur atomic layers, and the tungsten atomic layer is sandwiched by two sulfur atomic layers to form a "sandwich" structure. Tungsten atoms and sulfur atoms are covalently bonded to form a two-dimensional atomic crystal; Layered tungsten disulfide is composed of several single-layer tungsten disulfide, generally no more than five layers, with weak van der Waals force between layers; this unique "sandwich" layered structure makes graphene-like tungsten disulfide nanosheets in lubricants , catalysis, energy storage, sensors, electroluminescence and many other fields have broad application prospects; in addition, unlike graphene with a two-dimensional layered structure, graphene-like tungsten disulfide also has a special energy band structure; although graphite Graphene has high conductivity in a two-dimensional plane, but because pure graphene materials have no band gap, it brings disadvantages to its application in electronic devices such as transistors; however, graphene-like tungsten disulfide materials show rich electrical properties. Behavior, has different properties and characteristics from bulk materials; the macroscopic material of tungsten disulfide is an indirect band gap semiconductor with a band gap of 1.3 eV, while the single-layer tungsten di sulfide is a direct band gap semiconductor with a band gap of 2.1 eV, This special energy band structure makes graphene-like tungsten disulfide nanomaterials widely used in the preparation of electronic devices, photosensitive transistors, and energy storage devices; however, it is difficult to prepare graphene-like tungsten disulfide nanomaterials with layered structures. Graphene tungsten disulfide, the methods that can be used at present mainly include "top-down" stripping methods such as micromechanical force stripping method, lithium ion intercalation method, liquid phase ultrasonic method, as well as high temperature thermal decomposition, vapor deposition, hydrothermal The "bottom-up" synthesis method such as the above method, the yield of graphene-like tungsten disulfide prepared by the above methods is very small, and the high-temperature solid-phase method has a high yield, but there is no high-temperature solid-phase method to prepare graphene-like tungsten disulfide report on nanosheets

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