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Preparation method of two-dimensional ultrathin nanosheets with ferromagnetic b-doped g-c3n4

A technology of g-c3n4 and nanosheets, which is applied in chemical instruments and methods, nitrogen-metal/silicon/boron binary compounds, inorganic chemistry, etc., can solve problems such as shortage and difficulty in realization, and achieve convenient operation, low price, The effect of high yield

Inactive Publication Date: 2018-04-24
LANZHOU UNIVERSITY
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  • Abstract
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Problems solved by technology

However, it is very difficult to realize this theoretical ideal situation experimentally, and so far there is a lack of direct experimental evidence to support these theoretical predictions.

Method used

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  • Preparation method of two-dimensional ultrathin nanosheets with ferromagnetic b-doped g-c3n4
  • Preparation method of two-dimensional ultrathin nanosheets with ferromagnetic b-doped g-c3n4
  • Preparation method of two-dimensional ultrathin nanosheets with ferromagnetic b-doped g-c3n4

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Experimental program
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Embodiment 1

[0024] Dissolve 4 g of melamine and 0.05 g of boron oxide in 20 ml of ethanol and stir until completely mixed. Put the solution into an oven at 80°C and evaporate to dryness to obtain the precursor. The precursors were put into a porcelain boat and sintered in a tube furnace with argon (20 sccm) as a shielding gas. The tube furnace was heated from room temperature to 500 degrees Celsius at a heating rate of 5 degrees Celsius per minute and kept warm for two hours, then raised to 600 degrees Celsius at the same heating rate for two hours, turned off the power and naturally cooled to room temperature, and the obtained samples were taken out with alcohol After cleaning, centrifuge at a speed of 7000 rad / min to remove unreacted boron oxide, dry it, and ultrasonicate in an aqueous solution. The ultrasonic power ratio is set to 80%, and the temperature of the water tank is 30 degrees Celsius. The sample is peeled off by ultrasonication for one hour, and finally B g-C doped at 0.04 ...

Embodiment 2

[0027] Dissolve 4 g of melamine and 0.1 g of boron oxide in 80 ml of ethanol and stir until completely mixed. Put the solution into an oven at 80°C and evaporate to dryness to obtain the precursor. The precursors were placed in a porcelain boat and sintered in a tube furnace with argon (50 sccm) as a shielding gas. The tube furnace was heated from room temperature to 550 degrees Celsius at a heating rate of 7 degrees Celsius per minute and kept warm for two hours, then raised to 600 degrees Celsius at the same heating rate for two hours, turned off the power and naturally cooled to room temperature, and the obtained samples were taken out with alcohol After cleaning, centrifuge at a speed of 7000 rad / min to remove unreacted boron oxide, dry it, and ultrasonicate in an aqueous solution. The ultrasonic power ratio is set to 80%, and the temperature of the water tank is 50 degrees Celsius. The sample is peeled off by ultrasonication for one hour, and finally B g-C doped at 0.09 ...

Embodiment 3

[0030] Dissolve 4 g of melamine and 0.15 g of boron oxide in 20 ml of ethanol and stir until completely mixed. Put the solution into an oven at 80°C and evaporate to dryness to obtain the precursor. The precursors were put into a porcelain boat and sintered in a tube furnace with argon (100 sccm) as a shielding gas. The tube furnace was heated from room temperature to 500 degrees Celsius at a heating rate of 9 degrees Celsius per minute and kept warm for two hours, then raised to 650 degrees Celsius at the same heating rate for four hours, turned off the power and naturally cooled to room temperature, and the obtained samples were taken out with alcohol. After cleaning, centrifuge at a speed of 7000 / min to remove unreacted boron oxide, dry it, and ultrasonicate it in an aqueous solution. The ultrasonic power ratio is set to 80%, and the temperature of the water bath is 30 degrees Celsius. The sample is peeled off by ultrasonication for one hour, and finally B-doped g-C with a...

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Abstract

The invention discloses a preparation method for a ferromagnetic B-doped g-C3N4 two-dimensional ultrathin nanosheet. Precursors of melamine and boron oxide are degraded at high temperature in argon atmosphere, and then a chemical stripping method is conducted to obtain the B-doped g-C3N4 two-dimensional ultrathin nanosheet with ferromagnetic property at the room temperature, which is a very prospective material in the aspect of spintronics. The method has the advantages that the B-doped g-C3N4 two-dimensional ultrathin nanosheet is obtained through a method of high-temperature precursor degradation, no impurity phase is generated after B doping, a sample has the ferromagnetic property, and the Curie temperature is far higher than the room temperature. According to the method, the mass ratio of melamine to boron oxide in the precursors is controlled to realize different doping concentrations, so as to control the saturation magnetization of the sample. The preparation method provided by the invention is low in raw material cost, simple, convenient to operate, high in yield, pollution-free to environment, and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of spintronics material preparation, in particular to a B-doped g-C with room temperature ferromagnetism 3 N 4 Preparation method of two-dimensional ultrathin nanosheets. Background technique [0002] In recent years, graphene has attracted extensive attention due to its excellent optoelectronic properties. Graphene nanoribbons with zigzag edges exhibit room-temperature ferromagnetism, showing potential applications in future spintronic devices. This discovery opens up new directions in the search for next-generation spintronic materials. However, due to the zero band gap of graphene and the harsh conditions to realize its ferromagnetism experimentally (to provide a high in-plane electric field), its further application in spintronics is limited. Therefore, while people are studying how to solve the difficulties encountered in the application of graphene materials, they hope to find other graphene-like s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/06
CPCC01B21/0605C01P2002/72C01P2002/85C01P2004/04C01P2004/20
Inventor 高大强刘永刚
Owner LANZHOU UNIVERSITY
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