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Nanometer cobalt hydroxide-graphene composite membrane and preparation method and application thereof

A graphene composite and nano-graphene technology, which is applied in the field of nanomaterials, can solve problems such as high cost, pollution, and easy rupture of films, and achieve the effects of improving detection limits, wide application prospects, and improving detection sensitivity

Active Publication Date: 2014-12-10
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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  • Nanometer cobalt hydroxide-graphene composite membrane and preparation method and application thereof

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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 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.

[0036] The preparation method of described nanometer cobalt hydroxide-graphene composite membrane 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 wa...

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 and a preparation method and application thereof. The composite membrane comprises a nanometer graphene bottom layer and a nanometer cobalt hydroxide surface layer, wherein the thickness of the nanometer graphene bottom layer ranges from 4000nm to 6000nm; the thickness of the nanometer cobalt hydroxide surface layer ranges from 50nm to 100nm; the nanometer cobalt hydroxide surface layer is uniformly deposited on the nanometer graphene bottom layer. The preparation method comprises the following steps: uniformly dispersing graphene oxide in water, coating a flake conductive substrate with the obtained solution, and drying, thereby obtaining a nanometer graphene oxide membrane; and constructing a three-electrode system, depositing cobalt hydroxide on the surface of the nanometer graphene membrane by virtue of cyclic voltammetry, and drying. The method provided by the invention has the advantages of simplicity in operation, environment friendliness and the like. When the composite membrane provided by the invention is applied to the field of nanometer electrochemical sensors, the detection limit and detection sensitivity of a specific substance can be obviously improved, and thus the composite membrane has wide application prospects.

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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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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