Multi-element doped graphene fibers and preparation and application thereof

A graphene fiber and multi-element technology, applied in graphene, fiber chemical characteristics, textiles and papermaking, etc., can solve the problems of large demand for doping sources, complicated process, high cost, etc., and achieve simplified preparation process and excellent flexibility , the effect of increasing productivity

Active Publication Date: 2019-12-31
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides a multi-element doped graphene fiber, its preparation and application, which uses ionic liquid as a coagulation bath, utilizes active groups on the surface of graphene and ionic liquid Bonding to prepare uniformly loaded ionic liquid-graphene fibers, and then prepare non-metallic element co-doped graphene fibers through pyrolysis, ionic liquids are used as nitrogen sources, boron sources, and phosphorus sources, thus solving the problem of doping in the prior art In the preparation method of porous graphene fibers, the demand for doping sources is large, the process is complicated, pollution is generated, and the cost is high.

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  • Multi-element doped graphene fibers and preparation and application thereof
  • Multi-element doped graphene fibers and preparation and application thereof
  • Multi-element doped graphene fibers and preparation and application thereof

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preparation example Construction

[0042] The invention provides a kind of preparation method of the graphene fiber of multi-element doping, comprises the steps:

[0043] (1) the graphene oxide solution is injected into the coagulation bath with the method of wet spinning, the graphene oxide is gelled and separated out to obtain graphene oxide fibers, and the coagulation bath is an aqueous solution of an ionic liquid;

[0044] (2) reducing the graphene oxide fiber obtained in step (1), reducing the oxygen-containing functional group on the surface of the graphene oxide, and obtaining the graphene fiber after drying;

[0045] (3) Calcining the graphene fibers obtained in step (2) under an inert atmosphere, so that the graphene fibers are carbonized to obtain multi-element doped one-dimensional porous graphene fibers.

[0046]In order to coagulate and precipitate into fibers in the coagulation bath, the concentration of graphene oxide in the graphene oxide solution described in step (1) needs to reach a certain c...

Embodiment 1

[0071] Stir 5 g of expanded graphite in 270 ml of concentrated sulfuric acid (98%) for 2 hours, then slowly add 6 g of potassium permanganate to the solution, keep the reaction temperature below 5°C during this process, stir for 1 h to disperse evenly. Then the above was heated to 50° C. for 12 h to obtain a graphene oxide (GO) solution containing impurities. The reaction was introduced into a mixture of ice and water, and hydrogen peroxide was added until it became bright yellow. Add dilute hydrochloric acid aqueous solution to wash to ensure that the homogeneous phase of the system does not condense, and repeatedly centrifuge with deionized water until neutral to obtain a graphene oxide solution. The GO solution with a concentration of 20 mg / mL obtained by centrifugation was injected into a 6 mg / L ion solution by wet spinning, reduced with HI acid and freeze-dried. It was placed in an inert gas atmosphere and reacted in a tube furnace at 900 degrees Celsius for 2 hours, and...

Embodiment 2

[0077] Stir 5 g of expanded graphite in 270 ml of concentrated sulfuric acid (98%) for 2 hours, then slowly add 6 g of potassium permanganate to the solution, keep the reaction temperature below 5°C during this process, stir for 1 h to disperse evenly. Then the above was heated to 50° C. for 12 h to obtain a graphene oxide (GO) solution containing impurities. The reaction was introduced into a mixture of ice and water, and hydrogen peroxide was added until it became bright yellow. Add dilute hydrochloric acid aqueous solution to wash to ensure that the homogeneous phase of the system does not condense, and repeatedly centrifuge with deionized water until neutral to obtain a graphene oxide solution. The GO solution with a concentration of 12 mg / mL obtained by centrifugation was injected into a 6 mg / L ion solution by wet spinning, and then freeze-dried after reduction with HI acid. It was placed in an inert gas atmosphere and reacted in a tube furnace at 800 degrees Celsius for...

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Abstract

The invention belongs to the technical field of preparation of nano materials, and particularly relates to multi-element doped graphene fibers and preparation and application thereof. Ionic liquid isused as a coagulation bath of graphene oxide, then uniformly loaded ionic liquid-graphene fibers are prepared by bonding active groups on the surface of graphene with ionic liquid, non-metal element co-doped graphene fibers are prepared through pyrolysis, and the ionic liquid serves as a nitrogen source, a boron source and a phosphorus source, so that the graphene fibers with good conductivity andhigh electrochemical activity are prepared. The multi-element doped graphene fibers can be used as a microelectrode in an electrochemical sensing system to detect small biological molecules. The problems that in the preparation method of the doped porous graphene fibers in the prior art, the quantity demand on a doping source is large, the process is complex, pollution is caused, the cost is high, and in actual detection, powder needs to coat an electrode are solved.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and more specifically relates to a multi-element doped graphene fiber, its preparation and application. Background technique [0002] The excellent electrochemical behavior of carbon materials makes them have broad application prospects in the construction of portable and implantable electrochemical biosensors. The main way to obtain practical applications is to assemble them into macroscopic materials. Graphene, a perfect two-dimensional atomic crystal purely composed of carbon skeleton, has been widely used in chemistry, materials and so on because of its excellent electrochemical properties, high surface area, mechanical strength and biocompatibility, etc. , physics, biology, environment, energy and many other disciplines. Currently, graphene has been assembled into fibers, paper, and some three-dimensional porous structures. [0003] Since the Gaochao research group of Zhej...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/12C01B32/184G01N27/30G01N27/327
CPCC01B32/184D01F9/12G01N27/308G01N27/327G01N27/3277G01N27/3278
Inventor 肖菲许云张艳赵安顺
Owner HUAZHONG UNIV OF SCI & TECH
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