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Control and synthesis method for graphene-like carbon nitride ultrathin nanosheet

A technology of alkene carbonitride and a synthesis method, which is applied in the field of preparation of carbon nitride nanosheets, can solve problems such as difficult reaction control, and achieve the effect of improving utilization efficiency

Inactive Publication Date: 2018-03-06
ZHANGJIAGANG DONGDA IND TECH RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the use of carbon fiber with higher energy exchange efficiency as the microwave absorber in this method, while increasing the preparation speed and realizing fast and efficient synthesis, it also leads to a highly unstable state of the raw material system at the resonant cavity, making the reaction difficult. control, and finally obtained various forms of products

Method used

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  • Control and synthesis method for graphene-like carbon nitride ultrathin nanosheet
  • Control and synthesis method for graphene-like carbon nitride ultrathin nanosheet
  • Control and synthesis method for graphene-like carbon nitride ultrathin nanosheet

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Weigh 120g of melamine, mix with 1.5g of boric acid, add 100ml of aqueous solution, and heat to 80°C. After the above-mentioned materials are all dissolved in water and appear uniform milky white, they are naturally cooled, and the precipitated composite is mixed with 1 g of carbon fiber uniformly, and then put into a quartz crucible. Place the crucible and the materials in the center of the microwave cavity, evacuate to a pressure of 5kPa in the microwave cavity, set the microwave irradiation power to 6kW, heat it up to 550°C at a rate of 90°C / min and keep it warm for 15 minutes. Natural cooling to obtain the product.

[0044] Using scanning electron microscope (SEM) to observe the product to confirm ( figure 2 ), the obtained products are basically in the form of nanosheets with two-dimensional structure, and the morphology photos of the product of Comparative Example 5 without the addition of morphology control agent ( figure 1 )compared to, figure 2 No obvious powder...

Embodiment 2

[0046] Weigh 80 g of dicyandiamide, mix with 0.5 g of boron oxide, add 100 ml of aqueous solution, and heat to 70°C. After the above-mentioned materials are all dissolved in water and appear uniform milky white, they are naturally cooled, and the precipitated composite is mixed with 1 g of carbon fiber uniformly, and then put into a quartz crucible. Place the crucible and the materials in the center of the microwave resonant cavity, evacuate to a pressure of 25kPa in the microwave resonant cavity, set the microwave irradiation power to 3kW, heat it up to 520°C at a rate of 50°C / min and heat it for 20 minutes, Naturally cooled ultra-thin carbon nitride nanosheets (Graphene-like gC 3 N 4 ), the thickness is about 2 ~ 3nm.

Embodiment 3

[0048] Weigh 100 g of dicyandiamide and 1.0 g of boron oxide, add 100 ml of aqueous solution after mixing, and heat to 70°C. After the above-mentioned materials are all dissolved in water and appear uniform milky white, they are naturally cooled, and the precipitated composite is mixed with 1 g of carbon fiber uniformly, and then put into a quartz crucible. Place the crucible and the materials in the center of the microwave resonant cavity, evacuate to a pressure of 20kPa in the microwave resonant cavity, set the microwave irradiation power to 4kW, heat it up to 550°C at a rate of 50°C / min and keep it warm for 30 minutes. Naturally cooled ultra-thin carbon nitride nanosheets (Graphene-likeg-C 3 N 4 ), the thickness is about 3nm.

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Abstract

The invention discloses a control and synthesis method for a graphene-like carbon nitride ultrathin nanosheet, which comprises the following preparation steps: weighing nitrogen-enriched organic matters such as melamine, cyanuric acid and dicyandiamide according to proportion to be used as material precursors, and weighing boric acid or boron oxide used as shape control agents according to proportion, heating to 70-80 DEG C in a water solution for dissolving and mixing, and after being dissolved to present uniformly milk white, separating out and compounding; then drying, thus obtaining the uniformly compounded midbody; uniformly mixing the midbody with a carbon fiber microwave absorber, and then putting into a crucible; putting the crucible to the central position in a microwave cavity, vacuumizing until the pressure in the microwave cavity is 5-35kPa, setting microwave power to be 2-10kW, quickly heating the material to 500-620 DEG C by microwave irradiation, and carrying out thermalreaction for 5-30min, thus obtaining the ultrathin carbon nitride nanosheet with a graphene-like structure. By adopting the method disclosed by the invention, the ultrathin carbon nitride nanosheet with the graphene-like structure can be simply, conveniently and rapidly synthesized with advantages.

Description

Technical field [0001] The invention relates to the technical field of preparation of carbon nitride nanosheets, in particular to a preparation method based on high-energy microwave radiation heating technology, superior control synthesis and obtaining ultra-thin carbon nitride nanosheets with a graphene-like structure as the main product. Background technique [0002] Since the birth of graphene, due to its extremely excellent comprehensive functional characteristics, it has attracted many scientists and engineers around the world to carry out active research and application exploration. With the rise and continuous development of graphene research and the progress of material synthesis technology, more new two-dimensional functional materials will be obtained and applied to high-tech fields such as nanoelectronics. Nowadays, the exploration of the synthesis and functional properties of other types of two-dimensional nano-functional materials composed of silicon carbide, boron n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/082B82Y40/00
CPCC01B21/0602B82Y40/00C01P2004/03C01P2004/04
Inventor 王继刚邹婧叶沈田甜徐奇楠顾永攀
Owner ZHANGJIAGANG DONGDA IND TECH RES INST
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