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Preparation method of graphene film

A graphene film and graphene technology, applied in the direction of electrolytic inorganic material coating, etc., can solve the problem that the thickness of the film is difficult to control, and achieve the effect of controllable thickness, good quality and simple operation

Inactive Publication Date: 2011-05-11
HUNAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

In addition, the electrochemical reduction reported in the existing literature requires two steps, that is, the aqueous dispersion of graphene oxide is firstly deposited on the surface of the electrode by drop coating, dip coating, spin coating or electrophoresis, and then reduced by cyclic voltammetry or constant potential method. Graphene oxide, to obtain a graphene film, but the thickness of the film is difficult to control

Method used

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Embodiment 1

[0024] (1) Working electrode: clean the titanium-titania nanotube array composite electrode and set it aside;

[0025] (2) Prepare graphene oxide aqueous dispersion: graphene oxide is dispersed in 0.1mol / L Na 2 HPO 4 In the buffer solution, sonicate for 30 minutes and set aside;

[0026] (3) Preparation of graphene film: the titanium-titania nanotube array composite electrode is used as the working electrode, the platinum electrode is used as the counter electrode, and the saturated calomel electrode is used as the reference electrode, and the above three electrodes are placed in the graphene oxide aqueous dispersion In this study, cyclic voltammetric electroreduction and graphene deposition were performed on an electrochemical workstation, with a scanning voltage range of -1.5 volts to 1 volt, and a scanning rate of 50 millivolts per second. figure 1 It is a scanning electron microscope image of graphene film deposited on the electrode surface of titanium-titania nanotube a...

Embodiment 2

[0028] (1) working electrode: with embodiment 1;

[0029] (2) preparation of graphene oxide aqueous dispersion: with embodiment 1;

[0030] (3) Preparation of graphene film: the titanium-titania nanotube array composite electrode is used as the working electrode, the platinum electrode is used as the counter electrode, and the saturated calomel electrode is used as the reference electrode, and the above three electrodes are placed in the graphene oxide aqueous dispersion In this method, pulse voltage electroreduction and graphene deposition were carried out on the electrochemical workstation, the power-on voltage was -1.3 volts, and the pulse time on-off ratio was 0.5 seconds: 1.0 seconds. figure 2 It is a scanning electron microscope image of graphene film deposited on the electrode surface of titanium-titania nanotube array composite.

Embodiment 3

[0032] The titanium-titania nanotube array composite electrode in Example 1 was replaced by an aluminum-alumina electrode, and the rest were the same as in Example 1. image 3 It is a scanning electron microscope image of a graphene film deposited on the surface of an aluminum-alumina electrode.

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Abstract

The invention relates to a preparation method of a graphene film. In the invention, an electrochemical method is used for preparing a graphene film on the surface of a conductive substrate. The graphene film prepared by the method has the advantages of controllable thickness, controllable size, uniformity, continuity and crystallinity. The graphene film can be widely used in the fields of sensors, transistors, transparent electrodes, capacitors, catalysts, composite materials and the like.

Description

Technical field: [0001] The invention relates to a preparation method of a graphene film. Background technique: [0002] Since the discovery of graphene, due to its excellent mechanical, electronic and thermal stability properties, the application of graphene in electronic devices, electrodes, capacitors, sensors and composite materials has been widely valued and has become a current international hot research field. The application of graphene is premised on the preparation of low-cost, high-yield, and high-quality graphene. At present, the preparation methods of graphene mainly include mechanical exfoliation, epitaxial growth, chemical vapor deposition and solution processing. The mechanical exfoliation method is to use scotch tape to peel off the hydrolyzed graphite, and the highest quality graphene can be obtained, but the yield is low, which is not suitable for large-scale applications; the epitaxial growth method is to pyrolyze silicon carbide single crystal under hig...

Claims

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Application Information

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IPC IPC(8): C25D9/08
Inventor 罗胜联刘承斌唐艳红刘荣华滕雅蓉张甘张锡林
Owner HUNAN UNIV
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