Method for achieving 2H-to-1T phase transition of molybdenum disulfide

A technology of molybdenum disulfide and phase transformation, which is applied in the production of molybdenum sulfide and bulk chemicals to achieve the effect of simple process and simple post-treatment

Active Publication Date: 2017-03-08
ZHENGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Up to now, the method of realizing 1T phase is mainly ion intercalation method (Acerce M, Voiry D, Chhowalla M., Nature Nanotechnology, 2015, 10(4).), therefore, it is necessary to find a new method to effectively obtain two-dimensional MoS 2 Nanosheet 1T phase remains a challenge

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  • Method for achieving 2H-to-1T phase transition of molybdenum disulfide
  • Method for achieving 2H-to-1T phase transition of molybdenum disulfide
  • Method for achieving 2H-to-1T phase transition of molybdenum disulfide

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Embodiment 1

[0025] A method for realizing molybdenum disulfide 2H to 1T phase transformation, the steps are as follows:

[0026] 1) Add 50 mg of molybdenum disulfide into a beaker filled with 10 mL of solvent (deionized water: ethanol = 1:1), and seal it with plastic wrap. The sealed beaker was placed in a water-bath ultrasonic cleaner for 7 hours, then centrifuged at 5000 r / min for 20 minutes, and the upper layer was taken;

[0027] 2) Add 200 mg of PVP surfactant to the supernatant, and sonicate for 0.5h. Transfer to a supercritical reactor, and after reaching supercritical conditions (40°C, 16 MPa), stir continuously for 6 hours; take out the solution, add ethanol aqueous solution (equal ratio of ethanol to water) and centrifuge at a high speed (20000r / min, 20min), repeat three times , and then remove the surfactant; after washing, take away the upper layer, keep the lower precipitate, add solvent to dissolve, and ultrasonically homogenize to obtain MoS 2 solution.

[0028] figure ...

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Abstract

The invention relates to a method for achieving 2H-to-1T phase transition of molybdenum disulfide. The method comprises the steps: dissolving molybdenum disulfide in an aqueous solution of ethanol, and carrying out ultrasonic dispersion stripping; adding a surfactant into the solution obtained through ultrasonic dispersion stripping, carrying out uniform dispersion, placing the dispersion solution into a supercritical carbon dioxide reactor, and carrying out a reaction for 4 to 6 hours under the conditions of 40 DEG C and 16Mpa; carrying out separation and purification on the reaction solution. According to the method provided by the invention, the phase change of MoS2 is achieved in a surfactant micellar system constructed on the basis of assistance of supercritical carbon dioxide, a novel method mechanism for achieving the phase transition of MoS2 is obtained, and the content of phase 1T reaches about 90%, so that the method is simple in process and simple in aftertreatment, is novel, environmentally friendly and safe and has repeatability; compared with high-pressure high-temperature reaction conditions of ion intercalation methods, the method further has the advantages of moderateness and safety.

Description

technical field [0001] The invention belongs to the field of phase transformation of molybdenum disulfide, and specifically discloses a method for realizing the phase transformation of molybdenum disulfide from 2H to 1T. Background technique [0002] Two-dimensional nanomaterials are a focus research topic in the field of nanomaterials research. Among all 2D material studies, MoS 2 It has attracted extensive attention because of its electronic characteristics with superior charge carrier mobility and tunable charge carrier behavior. The semiconductor properties and special layered structure of molybdenum disulfide make it exhibit many excellent physical and chemical properties, such as large specific surface area, high reactivity, strong adsorption capacity, good catalytic performance, etc. , nano-optoelectronic devices, high-performance composite materials, and electrochemical hydrogen storage and lithium storage have good application prospects (Zhang G. , etal. , Energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/06
CPCC01G39/06C01P2002/70C01P2002/82C01P2004/03C01P2004/04C01P2004/61C01P2006/80Y02P20/54
Inventor 许群仝欣齐宇航
Owner ZHENGZHOU UNIV
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