A kind of preparation method of magnetic layered molybdenum disulfide nanosheet

Abstract

The invention provides a preparation method of magnetic layered molybdenum disulfide nanosheets. The preparation method comprises the following steps that Step1, molybdenum disulfide is added into stripping solvents, and a molybdenum disulfide dispersion liquid with an initial concentration in a ranged of 0.5-2 mg / ml is prepared, the molybdenum disulfide dispersion liquid is conducted ultrasonic dispersion 0.5-8 h at a temperature of 25-35 DEG C, a surface tension rang of the molybdenum disulfide dispersion liquid is 40-65 mJ / m2 tested at a temperature of 25 DEG C; Step2, the molybdenum disulfide dispersion liquid after being ultrasonic dispersed is centrifuged, upper suspensions of the molybdenum disulfide dispersion liquid after being centrifuged is filtered, filter cakes acquired from the upper suspensions are heated to dry in a vacuum drying chamber at a temperature of 60-100 DEG C. By the adoption of a chemical solvent method and an ultrasonic oscillation condition, stripping among atomic layers are conducted, so that the striping and preparation of the two-dimensional layered molybdenum disulfide nanosheets with a strong ferromagnetic performance can be achieved. The preparation is simple in technology, easy to operate, low in cost and high in productivity.

Description

technical field

[0001] The invention relates to the technical field of inorganic materials, in particular to a preparation method of two-dimensional layered magnetic nanosheets. Background technique

[0002] Two-dimensional layered nanomaterials with special properties have immeasurable application potential in the fields of semiconductors, microelectronic devices, and biomedicine, and have attracted great attention from scientists around the world. The research team of BorisI.Yakobson of Rice University in the United States reported the phenomenon that grain boundary defects and sulfur vacancies lead to the evolution of local hexagonal crystal structures into five-party or seven-party atomic structures through theoretical calculations, making molybdenum disulfide nanosheets possess magnetic properties. Theoretical calculations by SefaattinTongay et al. show that molybdenum disulfide nanosheets with zigzag edge effects have strong ferromagnetism. The existing technology mai...

Examples

Embodiment 1

[0025] Step 1: Molybdenum disulfide (MoS 2 ) stripping. Molybdenum disulfide raw material powder (SigmaAldrich, 1 μm) was weighed and added to N-methylpyrrolidone (stripping solvent) to prepare a molybdenum disulfide dispersion with an initial concentration of 0.1 mg / ml. Then put it into the first ultrasound machine for ultrasound for 2 hours, and then transfer to the second ultrasound machine for 8 hours of ultrasound.

[0026] Among them, the choice of stripping solvent is based on the range of surface tension. Through theoretical calculation, the surface tension of the organic solvent ranges from 40 to 65mJ / m 2 (25°C), the purpose of exfoliating single-layer, double-layer and multilayer molybdenum disulfide nanosheets can be achieved. The surface tension of the N-methylpyrrolidone of the present embodiment is 41.0mJ / m 2 (25°C), very suitable for the application of the present invention. Since the operating temperature has a direct impact on the surface tension of the o...

Embodiment 2

[0034] Step 1: Molybdenum disulfide (MoS 2 ) stripping. Weigh molybdenum disulfide raw material powder (SigmaAldrich, 1 μm) and add to benzaldehyde (stripping solvent, surface tension 40.72mJ / m 2(25°C)), prepare a molybdenum disulfide dispersion with an initial concentration of 0.5mg / ml. Then control the temperature at 25-35°C, put it into the first sonicator for 0.5h of sonication, and then transfer to the second sonicator for 4h of sonication.

[0035] Step 2: Centrifuge the molybdenum disulfide dispersion after ultrasonic dispersion, control the centrifugation speed to 2000rpm, and centrifuge for 30min. Then remove the precipitate separated by centrifugation, collect the upper suspension and filter to remove the benzaldehyde stripping solvent. The filter membrane is a PTFE filter membrane with a diameter of 47mm (Milliporefilter). Finally, the filter cake obtained by filtering is dried in a vacuum oven at 60°C, and the stripping solvent is volatilized to obtain molybden...

Embodiment 3

[0037] Step 1: Molybdenum disulfide (MoS 2 ) stripping. Weigh molybdenum disulfide raw material powder (SigmaAldrich, 1 μm) and add it to the stripping solvent formed by cetyltrimethylammonium chloride-isopropanol mixed solution (the concentration of cetyltrimethylammonium chloride is 0.01-0.2 mol / L, the surface tension is about 58mJ / m 2 (25°C)), prepare a molybdenum disulfide dispersion with an initial concentration of 1.5mg / ml. Then control the temperature at 25-35°C, put it into the first sonicator for 2 hours of sonication, and then transfer to the second sonicator for 8 hours of sonication.

[0038] Step 2: Centrifuge the ultrasonically dispersed molybdenum disulfide dispersion at a controlled centrifugation speed of 3000 rpm and a centrifugation time of 30 minutes. The precipitate separated by centrifugation was then removed, and the supernatant suspension was collected and filtered to remove the stripping solvent. The filter membrane is a PTFE filter membrane with a...

technical field

[0001] The invention relates to the technical field of inorganic materials, in particular to a preparation method of two-dimensional layered magnetic nanosheets. Background technique

[0002] Two-dimensional layered nanomaterials with special properties have immeasurable application potential in the fields of semiconductors, microelectronic devices, and biomedicine, and have attracted great attention from scientists around the world. The research team of BorisI.Yakobson of Rice University in the United States reported the phenomenon that grain boundary defects and sulfur vacancies lead to the evolution of local hexagonal crystal structures into five-party or seven-party atomic structures through theoretical calculations, making molybdenum disulfide nanosheets possess magnetic properties. Theoretical calculations by SefaattinTongay et al. show that molybdenum disulfide nanosheets with zigzag edge effects have strong ferromagnetism. The existing technology mai...

Examples

Embodiment 1

[0025] Step 1: Molybdenum disulfide (MoS 2 ) stripping. Molybdenum disulfide raw material powder (SigmaAldrich, 1 μm) was weighed and added to N-methylpyrrolidone (stripping solvent) to prepare a molybdenum disulfide dispersion with an initial concentration of 0.1 mg / ml. Then put it into the first ultrasound machine for ultrasound for 2 hours, and then transfer to the second ultrasound machine for 8 hours of ultrasound.

[0026] Among them, the choice of stripping solvent is based on the range of surface tension. Through theoretical calculation, the surface tension of the organic solvent ranges from 40 to 65mJ / m 2 (25°C), the purpose of exfoliating single-layer, double-layer and multilayer molybdenum disulfide nanosheets can be achieved. The surface tension of the N-methylpyrrolidone of the present embodiment is 41.0mJ / m 2 (25°C), very suitable for the application of the present invention. Since the operating temperature has a direct impact on the surface tension of the o...

Embodiment 2

[0034] Step 1: Molybdenum disulfide (MoS 2 ) stripping. Weigh molybdenum disulfide raw material powder (SigmaAldrich, 1 μm) and add to benzaldehyde (stripping solvent, surface tension 40.72mJ / m 2(25°C)), prepare a molybdenum disulfide dispersion with an initial concentration of 0.5mg / ml. Then control the temperature at 25-35°C, put it into the first sonicator for 0.5h of sonication, and then transfer to the second sonicator for 4h of sonication.

[0035] Step 2: Centrifuge the molybdenum disulfide dispersion after ultrasonic dispersion, control the centrifugation speed to 2000rpm, and centrifuge for 30min. Then remove the precipitate separated by centrifugation, collect the upper suspension and filter to remove the benzaldehyde stripping solvent. The filter membrane is a PTFE filter membrane with a diameter of 47mm (Milliporefilter). Finally, the filter cake obtained by filtering is dried in a vacuum oven at 60°C, and the stripping solvent is volatilized to obtain molybden...

Embodiment 3

[0037] Step 1: Molybdenum disulfide (MoS 2 ) stripping. Weigh molybdenum disulfide raw material powder (SigmaAldrich, 1 μm) and add it to the stripping solvent formed by cetyltrimethylammonium chloride-isopropanol mixed solution (the concentration of cetyltrimethylammonium chloride is 0.01-0.2 mol / L, the surface tension is about 58mJ / m 2 (25°C)), prepare a molybdenum disulfide dispersion with an initial concentration of 1.5mg / ml. Then control the temperature at 25-35°C, put it into the first sonicator for 2 hours of sonication, and then transfer to the second sonicator for 8 hours of sonication.

[0038] Step 2: Centrifuge the ultrasonically dispersed molybdenum disulfide dispersion at a controlled centrifugation speed of 3000 rpm and a centrifugation time of 30 minutes. The precipitate separated by centrifugation was then removed, and the supernatant suspension was collected and filtered to remove the stripping solvent. The filter membrane is a PTFE filter membrane with a...

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