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Method for preparing graphene nanowall on large scale

A graphene nano-wall and large-scale preparation technology, applied in the direction of graphene, nano-carbon, etc., can solve the problems of complex preparation conditions, difficult control, expensive instruments, etc., and achieve the effect of simple preparation process, low cost, and abundant surface defects

Inactive Publication Date: 2018-01-23
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has disadvantages including low yield, relatively low growth rate, difficult control of electric and magnetic fields, expensive instruments, and complicated preparation conditions.
However, few reports have used the traditional chemical vapor deposition method to directly synthesize graphene nanowalls.

Method used

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  • Method for preparing graphene nanowall on large scale
  • Method for preparing graphene nanowall on large scale
  • Method for preparing graphene nanowall on large scale

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The specific steps of growing graphene nanowalls by thermal chemical vapor deposition are as follows:

[0025] a. Place the substrates for growing graphene nanowalls in acetone, 95% ethanol, and deionized water for 3 minutes, and then dry them with nitrogen;

[0026] b. Place the stainless steel wire mesh in step a in three quartz boats respectively. Wherein the quartz boat near the end of the gas outflow heating furnace was put into 0.02 g of nickel foam, and the last two quartz boats were put into carbon paper respectively. In addition, a quartz boat containing 0.05 g of catalyst ferrocene and 0.025 g of nickel foam was placed in the heating zone where the reaction gas first flowed into the quartz tube.

[0027] c. Under normal pressure, feed 30 sccm of argon and raise the furnace temperature to 1100° C. at a rate of 27° C. / min, adjust the argon to 15 sccm, and introduce 90 sccm of methane and 30 sccm of hydrogen. Move the quartz boat equipped with the catalyst to e...

Embodiment 2

[0029] The difference from Example 1 is that the quartz tube was wiped dry with cotton soaked in ethanol. Then carry out the reaction according to the relevant conditions in Example 1, and graphene nanowalls can also be obtained, but only locally distributed. The resulting graphene nanowall SEM image is as follows image 3 shown.

Embodiment 3

[0031] What is different from Example 1 is that it reacts with the same conditions of Example 1, and can also obtain graphene nanowalls, but grows out impurities such as carbon fibers at the same time, and the resulting SEM image is as follows Figure 4 , Figure 5 shown.

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Abstract

The invention discloses a method for preparing a graphene nanowall on a large scale. The method comprises the following steps: (1) putting a quartz boat filled with foamed nickel and ferrocene into aquartz tube heating zone on a reaction gas inflow end, putting a quartz boat provided with a cleaned and dried stainless steel sheet or steel wire gauze into a quartz tube heating zone near a reactiongas outflow end; (2) heating to 1000-1200 DEG C under the normal pressure and the protection of an inert gas, maintaining the atmosphere of the inert gas, introducing hydrogen and a carbon source gasat the volume ratio of (1:6) to (2:3), and reacting for 1 minute to 3 hours; and (3) closing the carbon source gas and the hydrogen, and cooling a reaction furnace to the room temperature at the atmosphere of the inert gas. The ratio of the surface area to the volume of the graphene nanowall is larger, the edge is sharp, a thin layer is transparent, and the surface defects are rich; the preparation process is simple, the cost is low, the control process is controllable, the method has the advantage of more convenience as compared with the synthesis method like PECVD (Plasma Enhanced ChemicalVapor Deposition), and the graphene nanowall is produced on a large scale.

Description

technical field [0001] The invention belongs to the field of functional materials, and relates to a graphene nano wall and a preparation method thereof. Background technique [0002] In 1997, surface-bound graphene nanowalls were discovered in the fabrication of carbon nanotubes by evaporating graphite by direct current (DC) arc discharge in the presence of dilute hydrogen. Graphene nanowalls, as a new type of two-dimensional carbon nanomaterials, have shown interest in vertical structures with unique orientations, exposed sharp edges, non-stacked morphology, and large surface-to-volume ratios compared to conventional horizontally oriented graphite. There is great interest in the application of aligned graphene nanowalls (English full name Vertical AlignedGraphene nanowalls, hereinafter referred to as VG). So far, emerging applications of VG and its derivatives mainly include field emitters, atmospheric nanoscale corona discharge, gas sensors and biosensors, supercapacitors...

Claims

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Application Information

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IPC IPC(8): C01B32/186
Inventor 吴凡戴贵平胡海燕蒋邦邦严小玲邓曙光曾哲灵
Owner NANCHANG UNIV
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