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Method for synthesizing ultrathin molybdenum disulfide nanocrystals

A nanocrystalline and molybdenum sulfide technology, which is applied in the direction of molybdenum sulfide, nanotechnology, nanotechnology, etc., can solve the problems of poor crystallization of molybdenum disulfide, unfavorable popularization and use, and low yield, and achieve good crystallization, excellent oil solubility, and dispersibility Good results

Active Publication Date: 2015-11-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method requires extremely high temperature, and the synthesized molybdenum disulfide has poor crystallization and low yield, which is not conducive to popularization and use.

Method used

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  • Method for synthesizing ultrathin molybdenum disulfide nanocrystals
  • Method for synthesizing ultrathin molybdenum disulfide nanocrystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Get 10ml of oleylamine and 1ml of oleic acid and heat to 160°C, put ammonium molybdate and thiourea with a molar ratio of 1:10 and a total mass of 0.1g, react for 30 minutes, and pour out the mixed solvent of oleylamine and oleic acid. The obtained precipitate was washed with ethanol and dried at 40 °C to obtain ultrathin molybdenum disulfide nanocrystals with few atomic layers. The obtained products were all characterized by XRD and transmission electron microscopy. Its powder X-ray diffraction spectrum is attached figure 1 shown. Its transmission electron microscope photo is attached figure 2 shown, where the synthesized MoS 2 Most MoS is 1-5 atomic layers 2 Nanocrystalline.

Embodiment 2

[0024] Get 10ml of oleylamine and 1g of sodium oleate and heat to 300°C, put in the ammonium molybdate and thiourea that the molar ratio is 1:5 and the total mass is 20g, react for 120 minutes, pour out the oleylamine and wash the resulting precipitate with ethanol , and dried at 40 °C to obtain ultra-thin molybdenum disulfide nanocrystals with a few atomic layers. The obtained products were all characterized by XRD and transmission electron microscopy.

Embodiment 3

[0026] Get 10ml of octadecylamine and 5ml of oleic acid and heat to 240°C, put ammonium molybdate and thiourea with a molar ratio of 5:2 and a total mass of 5g, react for 60 minutes, and pour out the mixed solvent of oleylamine and oleic acid. The obtained precipitate was washed with ethanol and dried at 40 °C to obtain ultrathin molybdenum disulfide nanocrystals with few atomic layers. The obtained products were all characterized by XRD and transmission electron microscopy.

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Abstract

The invention discloses a method for synthesizing ultrathin molybdenum disulfide nanocrystals and belongs to the technical field of inorganic material preparation processes. According to the method, a molybdenum-containing inorganic salt and a sulfur-containing compound or sulfur powder are used as raw materials and have a reaction at the temperature of 160-300 DEG C for 30-120 min in a long-chain amine solvent and a long-chain fatty acid surfactant, experiment parameters such as the reactant molar ratio, the reactant concentration, the reaction temperature, the reaction time and the like are controlled, molybdenum disulfide nanocrystals which are well crystallized and have a few atomic layers (1-5 layers) are formed and can be well dispersed in a nonpolar solvent or base oil, and stable lubricating oil is formed. According to the method, raw materials are cheap and easy to obtain, the reaction time is short, the yield is high, instruments and equipment are simple, operation is convenient, safe and reliable, process repeatability is good, product quality is stable, and the method is suitable for industrial enlarged production.

Description

technical field [0001] The invention relates to a method for synthesizing ultrathin molybdenum disulfide nanocrystals, belonging to the technical field of inorganic material preparation technology. Background technique [0002] Molybdenum disulfide is used in lubricating oils and greases and is an excellent antifriction, antiwear and extreme pressure material. Molybdenum disulfide solid lubricant can be dispersed in grease, lubricating oil, water and organic solvent in a certain proportion (such as 0.5% to 85%), and can also be used alone or mixed with various resins to form coatings for various applications. Surface treatment agent for metal-like, alloy parts and ceramic materials. For more than half a century, molybdenum disulfide has been widely used in mechanical lubrication and industrial manufacturing of bearings and gears. In order to solve the current situation of low energy utilization rate, based on the excellent lubricating properties of molybdenum disulfide, do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/06B82Y30/00B82Y40/00
Inventor 李亚栋刘向文王定胜
Owner TSINGHUA UNIV
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