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A single-layer alternately stacked g-c 3 no 4 Preparation method of base two-dimensional superlattice

A g-c3n4, superlattice technology, applied in chemical instruments and methods, tungsten oxide/tungsten hydroxide, nitrogen and non-metallic compounds, etc., can solve high energy consumption, uncontrollable nucleation, and poor thermal stability of nanosheets and other problems, to achieve the effect of low energy consumption, simple steps, and high energy consumption

Active Publication Date: 2022-04-08
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As pointed out in the paper, the CVD synthesis method used has limitations: small temperature fluctuations lead to uncontrollable nucleation, high temperature leads to thermal decomposition of the deposited monatomic layer (monatomic layer nanosheets have poor thermal stability)
In addition, the CVD synthesis method also faces other problems, such as high energy consumption (reaction at a high temperature of about 1000 ° C), and the subsequent transfer steps of the material are complicated (separated from the growth substrate)

Method used

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  • A single-layer alternately stacked g-c <sub>3</sub> no <sub>4</sub> Preparation method of base two-dimensional superlattice
  • A single-layer alternately stacked g-c <sub>3</sub> no <sub>4</sub> Preparation method of base two-dimensional superlattice
  • A single-layer alternately stacked g-c <sub>3</sub> no <sub>4</sub> Preparation method of base two-dimensional superlattice

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of 2H-MoS for the synthesis of monolayer alternating stacking 2 / g -C 3 N 4 The method for two-dimensional superlattice material, concrete steps are as follows:

[0028] (1) A certain amount of 2H-MoS 2 The powder was mixed with formamide solution to form a concentration of 1 mg / mL (2H-MoS 2 / formamide) suspension, sonicated for 0.5h to make 2H-MoS 2 The powder is uniformly dispersed in the formamide solution.

[0029] (2) Pour the suspension in step (1) into a polytetrafluoroethylene reactor, the volume fraction of the suspension is 80%, the reaction temperature is 150°C, and the reaction time is 8h to form formamide intercalated 2H-MoS 2 of composite materials.

[0030] (3) The product obtained in step (2) was washed with ethanol, centrifuged and freeze-dried at low temperature to obtain formamide-intercalated 2H-MoS 2 The powder material; the powder material is calcined in a vacuum tube furnace, the calcination temperature is 300°C, the calcination time ...

Embodiment 2

[0032] A graphene / g-C for the synthesis of monolayer alternating stacks 3 N 4 The method for two-dimensional superlattice material, concrete steps are as follows:

[0033] (1) Mix a certain amount of graphite powder with formamide solution to form a suspension with a concentration of 2 mg / mL (graphite / formamide), and ultrasonically treat it for 1 hour to disperse the graphite powder evenly in the formamide solution.

[0034] (2) Pour the suspension in step (1) into a polytetrafluoroethylene reactor, the volume fraction of the suspension is 80%, the reaction temperature is 120°C, and the reaction time is 12h to form a composite material of formamide intercalated graphite .

[0035] (3) The product obtained in step (2) is washed with ethanol, centrifuged and freeze-dried at low temperature to obtain a powder material of formamide intercalated graphite; the powder material is calcined in a vacuum tube furnace at a calcination temperature of 400°C, and calcined The time is 2h, ...

Embodiment 3

[0037] A kind of WO for synthesizing single-layer alternate stacking 3 / g -C 3 N 4 The method for two-dimensional superlattice material, concrete steps are as follows:

[0038] (1) A certain amount of WO 3 The powder is mixed with formamide solution to form a concentration of 2mg / mL (WO 3 / formamide) suspension, ultrasonic treatment for 1h, so that the graphite powder is uniformly dispersed in the formamide solution.

[0039] (2) Pour the suspension in step (1) into a polytetrafluoroethylene reactor, the volume fraction of the suspension is 80%, the reaction temperature is 120°C, and the reaction time is 12h, forming formamide intercalation WO 3 of composite materials.

[0040] (3) The product obtained in step (2) was washed with ethanol, centrifuged and freeze-dried at low temperature to obtain formamide intercalated WO 3 The powder material; the powder material is calcined in a vacuum tube furnace, the calcination temperature is 400°C, the calcination time is 2h, and t...

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Abstract

The invention discloses a single-layer alternately stacked g-C 3 N 4 The invention discloses a method for preparing a base two-dimensional superlattice, belonging to the field of material synthesis. The present invention is based on solvothermal generation driving force to promote g-C 3 N 4 The precursor molecules enter the layer gap of the layered bulk material, and are calcined and polymerized at low temperature under an inert atmosphere to form a monolayer alternately stacked g-C 3 N 4 based two-dimensional superlattice. The invention solves the problems of high energy consumption, poor controllability, cumbersome synthesis steps and other problems of the current two-dimensional van der Waals heterojunction or superlattice synthesis method; realizes the precise control of the layer structure of the two-dimensional lattice material, mainly including layer thickness, Layer order, crystal quality. The synthesis process of the method is simple, and there is no cumbersome post-processing step. The g-C of the monolayer alternately stacked that the inventive method synthesizes 3 N 4 Based on two-dimensional superlattice materials, they can be widely used in basic research fields such as physical materials and application fields such as energy, environment, and medical treatment.

Description

technical field [0001] The invention relates to a single-layer alternately stacked g-C 3 N 4 The invention discloses a method for preparing a base-based two-dimensional superlattice, belonging to the technical field of material synthesis. Background technique [0002] Due to the quantum confinement effect, two-dimensional ultrathin nanomaterials have unique physical, chemical and electronic properties different from their bulk materials. For example, as the number of layers decreases, the electronic structure changes from a semiconductor with an indirect band gap to a semiconductor with a direct band gap. At the same time, the band gap becomes larger and a large number of atoms are exposed on the surface. Changes in material dimensions have a huge impact on the surface properties and optoelectronic properties of materials, such as enhanced optical transparency, increased surface defect concentration, and higher catalytic activity. With the discovery of graphene, two-dimen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/082C01G39/06C01B32/19C01G41/02
CPCC01B21/0605C01G39/06C01B32/19C01G41/02C01P2004/04C01P2002/72C01P2002/82C01P2004/03C01P2004/80
Inventor 甘小荣
Owner HOHAI UNIV