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Rapid assessment method of cleanness of large-area graphene

A graphene, large-area technology, applied in the field of materials, can solve the problems of limited evaluation area, long evaluation period, and high cost, and achieve the effects of convenient operation, low cost, and rapid characterization of large surfaces.

Active Publication Date: 2018-11-02
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, quantitative evaluation of the surface cleanliness of directly grown graphene is mostly carried out by spectroscopic methods, such as X-ray photoelectron spectroscopy, Raman spectroscopy, infrared spectroscopy, etc., but the evaluation cycle is long, the cost is high, and the evaluation area is limited

Method used

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  • Rapid assessment method of cleanness of large-area graphene
  • Rapid assessment method of cleanness of large-area graphene
  • Rapid assessment method of cleanness of large-area graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1, utilize the method for fumigation of titanium tetrachloride to evaluate the cleanliness of the ultra-clean graphene assisted preparation of foam copper

[0031] (1) Use dilute hydrochloric acid and deionized water with a mass fraction of 5% to clean the copper foil in sequence (produced by Alfa Aesar, with a purity of 99.8%, and a thickness of 25 μm), and the copper foil and the foamed copper are in close contact (specifically, the foamed copper is placed on the copper foil) Above the foil, the distance between them is 0.01 ~ 1mm, such as figure 1 shown) is placed in a casing with a magnetic control device, and then the casing is placed in a tube furnace. Under a hydrogen atmosphere with a flow rate of 100sccm and a system pressure of 100Pa, the temperature of the furnace body is raised to 1020°C and kept 30min;

[0032] (2) Keep the temperature of the furnace body at 1020° C., change the flow rate of hydrogen into hydrogen gas of 11 sccm, and feed in met...

Embodiment 2

[0039] Embodiment 2, utilize the method for fumigation of titanium tetrachloride to evaluate the cleanliness of the graphene prepared by common CVD process

[0040](1) Using a phosphoric acid and ethylene glycol solution with a volume ratio of 3:1 as the electrolyte, copper foil (produced by Alfa Aesar, with a purity of 99.8%, and a thickness of 25 μm) was connected to the positive electrode, and polished at a DC current of 0.5 A for 30 min. Put the copper foil in a casing with a magnetic control device, then put the casing in a tube furnace, and raise the temperature of the furnace body to 1000°C under a hydrogen atmosphere with a flow rate of 300 sccm, and keep the system pressure at 300 Pa. 50min.

[0041] (2) Keep the temperature of the furnace body at 900°C, 950°C or 1040°C, change the flow rate of hydrogen gas into 500 sccm of hydrogen gas, and feed into methane gas with a flow rate of 1 sccm, the system pressure is about 500 Pa, and keep for 8 hours.

[0042] (3) Use a...

Embodiment 3

[0048] Embodiment 3, utilize the method for fumigation of titanium tetrachloride to evaluate the cleanliness of the graphene prepared by common CVD process

[0049] (1) Using a phosphoric acid and ethylene glycol solution with a volume ratio of 3:1 as the electrolyte, copper foil (produced by Alfa Aesar, with a purity of 99.8%, and a thickness of 25 μm) was connected to the positive electrode, and polished at a DC current of 0.5 A for 30 min. Put the copper foil in a casing with a magnetic control device, then put the casing in a tube furnace, and raise the temperature of the furnace body to 1000°C under a hydrogen atmosphere with a flow rate of 300 sccm, and keep the system pressure at 300 Pa. 50min.

[0050] (2) Keep the temperature of the furnace body at 1000° C., change the flow rate of hydrogen into 500 sccm of hydrogen gas, and feed into methane gas with a flow rate of 1 sccm. The system pressure is about 500 Pa, and keep for 8 hours.

[0051] (3) Use a magnet to drag t...

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Abstract

The invention discloses a rapid assessment method of the cleanness of large-area graphene. The method comprises the following steps: depositing titanium dioxide nanoparticles on a graphene sample in atitanium tetrachloride fumigating manner; realizing assessment on the cleanness of the cleanness sample according to the deposition condition of the titanium dioxide nanoparticles; ensuring that thefumigating conditions are as follows: the temperature is 0 to 30 DEG C, the temperature is 10 to 70 percent, and the time is 5 to 600s; laying the graphene sample above titanium tetrachloride. Compared with the prior art, the method has the benefits that the cost is low, the method is convenient to operate, and massive rapid representation of the cleanness of the sample can be realized.

Description

technical field [0001] The invention relates to a method for quickly evaluating the cleanliness of large-area graphene, which belongs to the field of materials. Background technique [0002] Graphene is a two-dimensional film material formed by a single layer of carbon atoms arranged in a hexagonal symmetrical honeycomb structure. Due to the excellent properties of graphene in electricity, optics, heat and mechanics, it has attracted extensive attention in the fields of physics, chemistry, biology and materials since its discovery. For example, single-layer graphene has a Dirac cone-shaped energy band structure, and at the Fermi level, energy and momentum have a linear dispersion relationship. This unique energy band structure determines that graphene has extremely high carrier mobility, so graphene has gradually become a favorable substitute for traditional silicon-based electronic materials. Because graphene is a single atomic layer thin film material, its light absorpti...

Claims

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Application Information

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IPC IPC(8): G01N21/94G01N21/88G01N21/78G01N21/82G01N1/28
CPCG01N1/28G01N21/78G01N21/82G01N21/8803G01N21/8806G01N21/94G01N23/22G01N23/2202G01N2021/8825G01N2223/07G01N2223/652
Inventor 刘忠范彭海琳林立张金灿孙禄钊
Owner PEKING UNIV