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Liquid phase method for epitaxial growth of MoSe2-XnSem heterogeneous nano structures

A mose2-xnsem and nanostructure technology, applied in liquid phase epitaxial layer growth, crystal growth, single crystal growth, etc., to achieve the effect of reducing cost, reducing reaction temperature, and shortening growth time

Active Publication Date: 2016-04-06
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to optimize material properties, solve the problems existing in existing heterogeneous epitaxy synthesis methods, and provide a MoSe 2 -X n Se m Low-cost, mild reaction conditions, and environmentally friendly liquid-phase preparation method for heterogeneous nanostructures, aiming to explore new heteroepitaxial synthesis methods and improve the performance of products in electrocatalytic hydrogen evolution reactions

Method used

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  • Liquid phase method for epitaxial growth of MoSe2-XnSem heterogeneous nano structures
  • Liquid phase method for epitaxial growth of MoSe2-XnSem heterogeneous nano structures
  • Liquid phase method for epitaxial growth of MoSe2-XnSem heterogeneous nano structures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This example prepares MoSe according to the following steps 2 -NiSe hetero-nanostructure:

[0044] like figure 1 As shown, weigh 0.0326g (0.1mmol) oxymolybdenum acetylacetonate, 0.0340g (0.1mmol) dibenzyl diselenide, measure 6mL oleylamine, and carefully transfer them to the bottom of a 50mL three-necked flask A, and then pass into Argon, add high-temperature magnets to stir, heat the reactant to 130°C for 30min to remove water and other low-boiling impurities. Through temperature programming, the temperature was raised to 250° C. at a rate of 10° C. per minute, and continued to rise to 300° C. after 20 minutes of reaction.

[0045] During this period, weigh 0.0257 g (0.1 mmol) nickel acetylacetonate, 0.0170 g (0.05 mmol) dibenzyl diselenide, measure 0.5 mL oleylamine, and transfer them carefully to a 5 mL centrifuge tube B for ultrasonic dissolution Then put it in an oven at 70°C for later use.

[0046] When the temperature of the three-neck flask A was raised to 3...

Embodiment 2

[0054] Weigh 0.0326g (0.1mmol) oxymolybdenum acetylacetonate, 0.0340g (0.1mmol) dibenzyl diselenide, measure 6mL oleylamine, and carefully transfer them to the bottom of a 50mL three-necked flask A, and then feed argon, Add a high-temperature magnet to stir, and heat the reactant to 130°C for 30 minutes to remove moisture and other low-boiling impurities. Through temperature programming, the temperature was raised to 230°C at a rate of 10°C per minute, and the temperature was lowered to 200°C after 360 minutes of reaction.

[0055] During this period, weigh 0.0052 g (0.02 mmol) nickel acetylacetonate, 0.0034 g (0.01 mmol) dibenzyl diselenide, measure 0.5 mL oleylamine, and transfer them carefully to a 5 mL centrifuge tube B for ultrasonic dissolution Then put it in an oven at 70°C for later use.

[0056] When the temperature of the three-neck flask A dropped to 200°C, extract 0.5mL of the solution in the centrifuge tube B and quickly inject it into A, and keep it at 200°C for...

Embodiment 3

[0058] Weigh 0.0326g (0.1mmol) oxymolybdenum acetylacetonate, 0.0340g (0.1mmol) dibenzyl diselenide, measure 6mL oleylamine, and carefully transfer them to the bottom of a 50mL three-necked flask A, and then feed argon, Add a high-temperature magnet to stir, and heat the reactant to 130°C for 30 minutes to remove moisture and other low-boiling impurities. Through temperature programming, the temperature was raised to 320° C. at a rate of 10° C. per minute, and reacted for 5 minutes.

[0059] During this period, weigh 0.0196 g (0.06 mmol) nickel acetylacetonate, 0.0102 g (0.03 mmol) dibenzyl diselenide, measure 0.5 mL oleylamine, and transfer them carefully to a 5 mL centrifuge tube B for ultrasonic dissolution Then put it in an oven at 70°C for later use.

[0060]After the three-neck flask A reacted for 5 minutes, extract 0.5 mL of the solution in the centrifuge tube B and quickly inject it into A, and keep the reaction at 320°C for 5 minutes. After the reaction was finished...

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Abstract

The invention discloses a liquid phase method for epitaxial growth of MoSe2-XnSem heterogeneous nano structures, and is characterized in that the method comprises the steps: firstly, preparing MoSe2 nanosheets; and then performing epitaxial growth of XnSem nanocrystals on the surface of the MoSe2 nanosheets, to obtain the MoSe2-XnSem heterogeneous nano structures. With high-boiling-point organic substances as a solvent, the MoSe2-XnSem (including MoSe2-NiSe, MoSe2-Bi2Se3, MoSe2-CdSe and MoSe2-PbSe) heterogeneous nano structures are synthesized by the liquid phase method for the first time, the reaction conditions are simple and moderate, and process operation is simple; especially, the MoSe2-NiSe heterogeneous nano structure as a catalyst for hydrogen evolution has good electrocatalytic activity and electrochemical stability, so as to further indicate that the MoSe2-NiSe heterogeneous nano structure has potential application prospect in the energy transformation field.

Description

technical field [0001] The invention belongs to low-dimensional functional solid MoSe 2 -X n Se m The technical field of preparation of heterogeneous nanostructures, in particular to a kind of epitaxial growth MoSe 2 -X n Se m A liquid-phase approach to heterogeneous nanostructures. Background technique [0002] Electrocatalytic hydrogen evolution reaction is an important energy solution to deal with the energy crisis in the 21st century. Transition metal chalcogenides (MX 2 , M = MoorW, X = SorSe) is considered to be one of the most promising electrocatalysts for the hydrogen evolution reaction that can replace the noble metal platinum due to its cheap price and abundant reserves. MX 2 The structure is mainly composed of the 6-coordinated central atom M sandwiched between the upper and lower layers of sulfur atoms to form a S-M-S three-atom layer, which is then stacked on each other through weak van der Waals forces to form a layered crystal. According to the experi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B19/00C30B29/10C25B1/04
CPCC25B1/04C30B19/00C30B29/10Y02E60/36
Inventor 杨晴周晓丽
Owner UNIV OF SCI & TECH OF CHINA
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