Carbon fiber@ tungsten disulfide nanosheet kernel-shell composite structure and preparation method thereof

A technology of tungsten disulfide and composite structure, applied in chemical instruments and methods, nanotechnology, tungsten compounds, etc., can solve problems such as difficult control, complex chemical reactions, complex purification and impurity removal, etc., and achieve uniform diameter and thickness and high purity , nanoscale ordered effects

CN106006740AInactive Publication Date: 2016-10-12CHINA UNIV OF GEOSCIENCES (BEIJING)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-10-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a carbon fiber@ tungsten disulfide nanosheet kernel-shell composite structure and a preparation method thereof and belongs to the technical field of material preparation. Carbon fibers serve as the kernel of the composite structure, and tungsten disulfide nanosheets in an array shape serve as the shell. In a vacuum tube type furnace, a thermal evaporation technology is utilized to directly evaporate powdered sulfur which serves as a sulfur source, under the effect of carrier gas, pre-oxidized polyacrylonitrile fibers soaked with WO3 turbid liquid are fumigated at a high temperature, synchronous synthesis of the carbon fibers and the tungsten disulfide nanosheets is achieved, and the carbon fiber@ tungsten disulfide nanosheet kernel-shell composite structure can be prepared with a high yield. By means of the method, the yield of the product is large, density is high, purity is high, appearance is controllable, and postprocessing is not needed; the method has the advantages of being simple in equipment and process, strict and controllable in synthesis and growth conditions, high in product yield, low in cost, clean and environmentally friendly in production process and the like. Obtained materials are excellent visible light catalysts, electrocatalysts, lithium ion anode materials and light-emitting transistor materials.
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Description

technical field

[0001] The invention relates to a carbon fiber@tungsten disulfide nanosheet core-shell composite structure and a preparation method thereof, belonging to the technical field of material preparation. Background technique

[0002] Tungsten disulfide has a graphene-like structure and is a typical layered compound. The atoms in the layer are bonded by strong covalent bonds, and the interlayer is weak van der Waals force. The unique structure of tungsten disulfide endows it with special mechanical, optical and electrical properties. Therefore, tungsten disulfide nanomaterials are not only widely used in the fields of lubrication and wear, but also in catalysis (such as visible light degradation of organic pollutants, visible light hydrogen production, electrocatalytic hydrogen production), lithium batteries (such as anode materials), photoelectric conversion ( Such as light-emitting diodes, solar cells) and other fields have broad application prospects, which has...

Examples

preparation example Construction

[0030] The preparation method of the carbon fiber@tungsten disulfide nanosheet core-shell composite structure proposed by the present invention includes the following steps and contents:

[0031] (1) Using commercially available analytically pure sulfur powder, WO 3 Powder and chemically pure pre-oxidized polyacrylonitrile fibers are used as raw materials.

[0032] (2) will WO 3 Powder and absolute ethanol are mixed according to the ratio of (10-100g): (50-100ml), fully stirred to make a uniform suspension; then place the pre-oxidized polyacrylonitrile fiber in it and soak for 10-60min; then dry Dry and set aside.

[0033](3) In the vacuum tube furnace, place the alumina ceramic crucible with sulfur powder on the top of the air flow at a distance of 10-40 cm from the central heating area of ​​the furnace, and place the crucible soaked in WO 3 A quartz-based boat of suspension of pre-oxidized polyacrylonitrile fibers is placed in the central heating zone of the furnace.

[...

Embodiment 1

[0039] Example 1: In a vacuum tube furnace, place an alumina ceramic crucible with 1g of sulfur powder on the top of the airflow at a distance of 20cm from the central heating zone of the furnace, and fill it with a concentration of 4g of WO 3 Powder and 5ml of absolute ethanol suspension prepared and dried pre-oxidized polyacrylonitrile fiber quartz-based boat placed in the central heating area of ​​the furnace.

[0040] Before heating, first use a vacuum pump to evacuate the entire system to below 0.02Pa, then feed high-purity argon gas with a volume above 99.99vol.% into the system, and repeat 3 times to remove the air in the system. Then the temperature was raised to 400° C. at a rate of 20° C. / min, kept for 10 minutes, and then raised to 1050° C. at a rate of 30° C. / min, and kept for 1 hour. During the heating process, under the premise that the vacuum system continued to work, argon gas was introduced and the flow rate of the carrier gas was kept at 100 standard cubic ce...