Method for preparing molybdenum disulfide nanotube

A molybdenum disulfide and nanotube technology, applied in the directions of molybdenum sulfide, nanotechnology, nanotechnology, etc., can solve the problems of low yield, difficult to popularize and apply on a large scale, and difficult to control the wall thickness of nanotubes, so as to avoid post-processing. The process and preparation method are flexible and changeable, and the effect of avoiding waste water

CN104386753AActive Publication Date: 2015-03-04HEFEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2015-03-04

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Abstract

The invention discloses a method for preparing a molybdenum-disulfide (MoS2) nanotube. The method is characterized by comprising the following steps of preparing a C-MoS2 coaxial nanotube wrapped by homogeneous MoS2 by taking a fibrous carbon (C) nanomaterial as a template, and calcining the C-MoS2 coaxial nanotube at a high temperature in a flowing CO2 atmosphere to remove C to obtain the MoS2 nanotube. The thickness of the wall of the MoS2 nanotube prepared by adopting the method can be controlled by changing the thickness of the MoS2 wrapping layer in the C-MoS2 coaxial nanotube. Because the raised surface or sharply bent part of the fibrous C nanomaterial can not be totally wrapped by MoS2, the prepared MoS2 nanotube has structure defects correspondingly, but the number of active spots on the edge of the MoS2 nanotube can be increased due to the structure defects so that the MoS2 nanotube has excellent optical and catalytic properties.
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Description

1. Technical field

[0001] The invention relates to a preparation method of molybdenum disulfide nanotubes. 2. Background technology

[0002] Molybdenum disulfide is a graphene-like layered compound. Its structural unit is composed of three layers of atoms, that is, each Mo(IV) atom is in the center of a triangular prism and is coordinated with six sulfur atoms. The valence bonds are distributed on both sides of the Mo atomic layer, forming a layered structure similar to a sandwich. The unique layered structure makes it possible to form many novel nanostructures, such as the weak van der Waals force between layers, which makes it easy to be peeled off into monodisperse multi-layer or even single-layer nanosheets, and the atomic bonds in the interior and edge of these nanosheets The valence is different, the inner atoms are saturated, while the edge atoms are unsaturated, forming dangling bonds, that is, the edge active sites. In addition, the thin layer of molybdenum disulfi...

Examples

Embodiment 1

[0026] The present embodiment prepares molybdenum disulfide nanotubes according to the following steps:

[0027] Dissolve 5g of ammonium molybdate in distilled water, add 40mL of ammonium sulfide solution and 20mL of ammonia water with a mass concentration of 28-29%, and react at 60-70°C for 2 hours. After the reaction, stand and crystallize at 2-10°C for 48 hours. Filter and dry at room temperature to obtain ammonium tetrathiomolybdate crystals;

[0028] Dissolve 3 g of ammonium tetrathiomolybdate crystals and 2 mL of polyethylene glycol in 50 mL of distilled water in order to obtain a mixed solution, then add 0.5 g of carbon nanotubes, ultrasonically disperse for 1 hour and then centrifuge, wash with distilled water and absolute ethanol in turn, and place in Drying at 60°C, then calcining at 850°C for 2 hours under the protection of hydrogen, and cooling to room temperature to obtain homogeneous molybdenum disulfide-coated C-MoS 2 coaxial nanotubes.

[0029] 2 g of homogen...

Embodiment 2

[0032] The present embodiment prepares molybdenum disulfide nanotubes according to the following steps:

[0033] Dissolve 5g of ammonium molybdate in distilled water, add 40mL of ammonium sulfide solution and 20mL of ammonia water with a mass concentration of 28-29%, and react at 60-70°C for 2 hours. After the reaction, stand and crystallize at 2-10°C for 48 hours. Filter and dry at room temperature to obtain ammonium tetrathiomolybdate crystals;

[0034] Dissolve 0.5g of ammonium tetrathiomolybdate crystals and 2mL of polyethylene glycol in 50mL of water in order to obtain a mixed solution, then add 0.5g of carbon nanofibers, ultrasonically disperse for 1 hour and then centrifuge, wash with distilled water and absolute ethanol in turn, and dry at 60 °C, then calcined at 850 °C for 2 hours under the protection of hydrogen, and cooled to room temperature to obtain homogeneous molybdenum disulfide-coated C-MoS 2 coaxial nanotubes.

[0035] 4 g of homogeneous molybdenum disulfi...

Embodiment 3

[0037] The present embodiment prepares molybdenum disulfide nanotubes according to the following steps:

[0038]Dissolve 5g of ammonium molybdate in distilled water, add 40mL of ammonium sulfide solution and 20mL of ammonia water with a mass concentration of 28-29%, react at 60-70°C for 2 hours, and leave it to crystallize at 2-10°C for 48 hours after the reaction. Filter and dry at room temperature to obtain ammonium tetrathiomolybdate crystals;

[0039] Dissolve 3g of ammonium tetrathiomolybdate crystals and 2mL of polyethylene glycol in 50mL of water to obtain a mixed solution, then add 0.5g of carbon nanowires, ultrasonically disperse for 1 hour and then centrifuge, successively wash with distilled water and anhydrous ethanol, and place in 60 ℃ drying, then calcined at 850 ℃ for 2 hours under the protection of hydrogen, and cooled to room temperature to obtain homogeneous molybdenum disulfide-coated C-MoS 2 Coaxial nanotubes.

[0040] 4 g of homogeneous molybdenum disulf...