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Carbon fiber-molybdenum selenide nanosheet core-shell composite structure and preparation method thereof

A technology of molybdenum diselenide and composite structure, which is applied in the direction of binary selenium/tellurium compounds, carbon preparation/purification, chemical instruments and methods, etc., and can solve problems such as complex purification and impurity removal, complex chemical reactions, and difficult control. Achieve nanoscale order, high purity, uniform diameter and thickness

Inactive Publication Date: 2017-01-11
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chemical reactions of these liquid-phase methods are complex, difficult to control, and require complicated follow-up purification and impurity removal processes.

Method used

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  • Carbon fiber-molybdenum selenide nanosheet core-shell composite structure and preparation method thereof
  • Carbon fiber-molybdenum selenide nanosheet core-shell composite structure and preparation method thereof
  • Carbon fiber-molybdenum selenide nanosheet core-shell composite structure and preparation method thereof

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preparation example Construction

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

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

[0032] (2) MoO 3 Powder and absolute ethanol are mixed according to the ratio of (5-80g):(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 selenium powder on the top of the air flow at a distance of 25-45 cm from the central heating area of ​​the furnace, and fill the crucible soaked with MoO 3 The suspension of pre-oxidized polyacrylonitrile fibers on a quartz substrate is placed in the central heating zone of the furnac...

Embodiment 1

[0039] Embodiment 1: in the vacuum tube furnace, the aluminum oxide ceramic crucible that 3g selenium powder is housed is placed on air flow top distance furnace central heating zone 37cm place, will hold the concentration of warp that is 1g MoO 3 Powder and 5ml of absolute ethanol prepared by soaking and drying the pre-oxidized polyacrylonitrile fiber quartz substrate placed in the central heating area of ​​the furnace.

[0040] Before heating, first use a vacuum pump to evacuate the whole system to below 0.01Pa, then feed high-purity argon gas of more than 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 at a temperature of 10 minutes, and then raised to 1110° C. at a rate of 20° C. / min, and kept at a temperature of 3 hours. During the heating process, under the premise that the vacuum system continued to work, argon gas was introduced and the carrier gas flow rate was mai...

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Abstract

The invention relates to a carbon fiber-molybdenum selenide nanosheet core-shell composite structure and preparation method thereof, and belongs to the technical field of material preparation. A core of the composite structure is carbon fibers, and a shell of the composite structure is array-shaped molybdenum selenide nanosheets. The method comprises the steps that in a vacuum tube furnace, selenium powder is directly evaporated through a thermal evaporation technology, under the action of carrier gas, pre-oxidized polyacrylonitrile fiber soaked with MoO3 suspension is fumigated at high temperature, the condition that the carbon fibers and the molybdenum selenide nanosheets are synthesized simultaneously is achieved, and the arbon fiber-molybdenum selenide nanosheet core-shell composite structure can be obtained through high-yield preparation. Products prepared through the method is high in yield, density and purity, controllable in morphology and free of after-treatment; the method has the advantages of being simple in equipment and technology, strict and controllable in synthetic growth condition, high in product yield, low in cost, clean and environmentally friendly in production process and the like. The obtained material is an excellent visible light catalyst, an electro-catalyst, a sodium-ion / lithium-ion anode material and a light-emitting transistor material.

Description

technical field [0001] The invention relates to a carbon fiber@molybdenum diselenide nanosheet core-shell composite structure and a preparation method thereof, belonging to the technical field of material preparation. Background technique [0002] In recent years, two-dimensional nanomaterials have attracted extensive attention due to their unique structures and properties and their applications in the field of micro-nanoelectronics. The representative two-dimensional nanomaterial is graphene, which has strong toughness, good electrical conductivity, high electron mobility and other properties, and has a wide range of potential applications in nanoelectronics, photonics, sensors and other fields. Compared with graphene, the bandgap of transition metal dichalcogenides is slightly wider, for example, the bandgap of tungsten disulfide is about 1.8eV, and the bandgap of molybdenum disulfide is about 1.2eV, which play an important role in field effect transistors and low-power el...

Claims

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Application Information

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IPC IPC(8): C01B32/05C01B19/04B01J27/051
CPCC01B19/007B01J27/051C01P2004/80C01P2002/72C01P2004/03B01J35/50B01J35/40B01J35/39
Inventor 彭志坚王猛钱静雯李宏李汉青申振广符秀丽
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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