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A kind of nano cobalt hydroxide-graphene composite film, its preparation method and application

A graphene composite and nano-graphene technology, which is applied in the field of nanomaterials, can solve the problems of pollution, easy cracking of thin films, and high cost, and achieve the effects of wide application prospects, improved detection sensitivity, and improved detection limit.

Active Publication Date: 2016-08-31
HUAZHONG UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a nanometer cobalt hydroxide-graphene composite film, its preparation method and application, the purpose of which is to prepare a new type of graphene composite film by a one-step electrochemical reduction method. membrane, thereby solving the technical problems of serious pollution, high cost and easy rupture of the film in the current preparation process of metal oxide / metal hydroxide nano-membrane

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  • A kind of nano cobalt hydroxide-graphene composite film, its preparation method and application
  • A kind of nano cobalt hydroxide-graphene composite film, its preparation method and application
  • A kind of nano cobalt hydroxide-graphene composite film, its preparation method and application

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[0027] The preparation method of described nanometer cobalt hydroxide-graphene composite membrane is characterized in that, comprises the following steps:

[0028] (1) Evenly disperse the graphene oxide in water to form a graphene oxide solution with a concentration of 2 mg / ml to 4 mg / ml; it is preferable to uniformly disperse the graphene oxide in ultrapure water by means of ultrasonic dispersion;

[0029] (2) The graphene oxide solution obtained in step (1) is coated on the sheet-shaped conductive substrate, and the coating amount is 0.5ml / cm 2 ~1ml / cm 2 , to obtain nano-graphene oxide film after drying;

[0030] (3) Set up a three-electrode system: the nano-graphene oxide film obtained in step (2) is used as a working electrode, the platinum electrode is used as an auxiliary electrode, and the saturated calomel electrode is used as a reference electrode, and each liter of electrolyte contains 40 mmol of cobalt sulfate to 60mmol and sodium sulfate 0.05mol to 0.15mol, using...

Embodiment 1

[0035] A nano-cobalt hydroxide-graphene composite film is characterized in that, comprising a nano-graphene bottom layer and a nano-cobalt hydroxide surface layer, the nano-graphene bottom layer thickness is 4000nm, and the nano-cobalt hydroxide surface layer thickness is 50nm, so The nano-cobalt hydroxide surface layer is evenly deposited on the nano-graphene bottom layer. The nano-graphene bottom layer has wrinkles and undulations in different degrees, and the nano-graphene sheets are in an interlocking state, so they have good macroscopic flexibility and rigidity; the nano-cobalt hydroxide layer is The nano-cobalt hydroxide layer is a uniform and fluffy nano-sheet structure.

[0036] The preparation method of described nanometer cobalt hydroxide-graphene composite film is characterized in that, comprises the following steps:

[0037](1) The aqueous solution of graphene oxide was prepared by the Hummers method, so that the graphene oxide was uniformly dispersed in water to ...

Embodiment 2

[0042] A nano-cobalt hydroxide-graphene composite film is characterized in that, comprising a nano-graphene bottom layer and a nano-cobalt hydroxide surface layer, the nano-graphene bottom layer thickness is 5000nm, and the nano-cobalt hydroxide surface layer thickness is 75nm, so The nano-cobalt hydroxide surface layer is uniformly deposited on the nano-graphene bottom layer. The nano-graphene bottom layer has wrinkles and undulations in different degrees, and the nano-graphene sheets are in an interlocking state, so they have good macroscopic flexibility and rigidity; the nano-cobalt hydroxide layer is The nano-cobalt hydroxide layer is a uniform and fluffy nano-sheet structure.

[0043] The preparation method of described nanometer cobalt hydroxide-graphene composite membrane is characterized in that, comprises the following steps:

[0044] (1) The aqueous solution of graphene oxide was prepared by the Hummers method, so that the graphene oxide was uniformly dispersed in w...

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Abstract

The invention discloses a nanometer cobalt hydroxide-graphene composite membrane, a preparation method and an application thereof. The composite film includes a bottom layer of graphene nanometer and a surface layer of nanometer cobalt hydroxide, the thickness of the bottom layer of graphene nanometer is between 4000nm and 6000nm, the thickness of the surface layer of nanometer cobalt hydroxide is between 50nm and 100nm, and the thickness of the nanometer cobalt hydroxide surface layer is between 50nm and 100nm. The surface layer of cobalt oxide is evenly deposited on the nano-graphene bottom layer. The preparation method comprises the following steps: uniformly dispersing graphene oxide in water, coating it on a sheet-shaped conductive substrate, and drying to obtain a nanometer graphene oxide film; forming a three-electrode system and depositing cobalt hydroxide on the nanometer surface by cyclic voltammetry Graphene membrane surface, dry. The method provided by the invention has the advantages of simple operation, environmental friendliness and the like. When the composite thin film provided by the invention is applied to the field of nanometer electrochemical sensors, the detection limit and detection sensitivity of specific substances can be significantly improved, and the application prospect is very broad.

Description

technical field [0001] The invention belongs to the field of nanomaterials, and more specifically relates to a nanometer cobalt hydroxide-graphene composite film, its preparation method and application. Background technique [0002] Graphene is a unique two-dimensional planar structure single-layer carbon nanomaterial, and the carbon atoms are connected by covalent bonds to form a hexagonal honeycomb structure. This unique structural feature makes it have good electrical, mechanical and thermal properties, and has broad application prospects in nanoelectronics, microelectronics, energy storage, etc. in recent years. In addition, based on graphene's potential cheap batch preparation method and rich chemical modification functions, graphene can not only show its magical functions as an atom-thick nanomaterial, but also can be assembled into a new type of macroscopic thin film material. For example, other functional nanomaterials are loaded onto graphene films to make function...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/00G01N27/30G01N27/333
Inventor 刘宏芳董爽肖菲秦双
Owner HUAZHONG UNIV OF SCI & TECH
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