Low nucleation density graphene single crystal preparation method based on cuprous oxide film substrate

A technology of cuprous oxide and nucleation density, which is applied in chemical instruments and methods, single crystal growth, single crystal growth, etc., can solve the problems that the theoretical value cannot be reached, and the electrical properties of graphene need to be improved, so as to achieve the nucleation density Reduced, easy control of single crystal density, effect of increasing single crystal size

Inactive Publication Date: 2015-10-14
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Problems solved by technology

However, the existing research results show that the mobility of graphene devices prepared by CVD method is roughly 1000-10000 cm 2 / V·s, far less than the theoretical value of 200000cm 2 / V s, it can be seen that the electrical properties of graphene prepared by CVD still need to be improved

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  • Low nucleation density graphene single crystal preparation method based on cuprous oxide film substrate
  • Low nucleation density graphene single crystal preparation method based on cuprous oxide film substrate

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preparation example Construction

[0026] A method for preparing a graphene single crystal with low nucleation density based on a cuprous oxide thin film substrate, comprising the following steps:

[0027] (1) Preparation of cuprous oxide thin film: place the copper foil before graphene single crystal growth after polishing in an annealing furnace, feed oxygen-containing air and heat for a period of time, so that the surface of copper foil for graphene single crystal growth is formed thin copper oxide layer, and then soak the obtained copper oxide film in a hydrazine hydrate solution to obtain a substrate whose surface is cuprous oxide. The heating temperature of the copper foil in oxygen-containing air is 150-500°C. The heating time of the copper foil in oxygen-containing air is 1-120min. The volume percentage of oxygen contained in the oxygen-containing air is 10%-100%. The volume percent concentration of the hydrazine hydrate solution is 1%-30%. The soaking time of the hydrazine hydrate solution is 10-60 ...

Embodiment 1

[0030] Place the polished copper foil before graphene single crystal growth in an annealing furnace, heat it to 250°C with oxygen-containing air, and keep it for 30 minutes to form a thin oxide layer on the surface of the copper foil for graphene single crystal growth, cool down and take it out sample. Soak the obtained sample in 5% hydrazine hydrate solution by volume for 30 minutes, take it out and blow dry.

[0031] figure 1 A and b are the Raman images of the substrate copper and the cuprous oxide film substrate after treatment with hydrazine hydrate, respectively. figure 1 Peaks 216 and 626cm appear in b -1 It shows that the surface of the substrate is a cuprous oxide film. In the experiment, cuprous oxide derived from copper oxide was reduced in hydrazine hydrate solution. Therefore, the prepared cuprous oxide content is related to the concentration and time of soaking the sample in the hydrazine hydrate solution.

Embodiment 2

[0033] Put the cuprous oxide thin film substrate and the substrate copper foil grown by traditional CVD into the reaction chamber, heat to 1050°C, feed hydrogen gas so that the flow ratio of argon gas and hydrogen gas is 5:1, and anneal for half an hour. Then, 1.5 sccm of mixed methane (0.05% methane + 99.5% argon), 20 sccm of hydrogen, and 1000 sccm of argon were introduced, and the growth time was 25 min. The samples were compared by scanning electron microscopy.

[0034] figure 2 In the figure is the optical microscope result after the substrate copper foil and cuprous oxide thin film substrate grown by traditional CVD are treated and grown in Example 2. In order to resolve the graphene core substrate, the sample was heated to 150 °C in air for 10 min. like figure 2 The hexagonal regions in a and 2b are graphene single crystals. It can be seen from the comparison that the nucleation density of graphene directly grown by CVD on the copper foil substrate is high, while ...

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Abstract

The present invention relates to a low nucleation density graphene single crystal preparation method based on a cuprous oxide film substrate. The low nucleation density graphene single crystal preparation method is characterized in that the low nucleation density graphene single crystal is directly prepared through the cuprous oxide film substrate. The specific preparation steps comprise: (1) preparing a cuprous oxide film; and (2) preparing a low-density graphene single crystal. According to the present invention, the preparation process is provided, such that the single crystal density of the CVD graphene is easily controlled, and the graphene nucleation density of the treated copper surface is substantially reduced so as to increase the single crystal size, and reduce the influence of the graphene grain boundary on the electrical property of the film; and the preparation method has high repeatability, and is simple and easy to perform.

Description

technical field [0001] The invention belongs to the field of preparation of graphene materials, in particular to a method for preparing graphene single crystals with low nucleation density based on cuprous oxide film substrates. Background technique [0002] Graphene is made of sp 2 The hexagonal honeycomb two-dimensional material composed of hybrid carbon atoms has many superior properties: such as large specific surface area, excellent electrical and thermal conductivity and low thermal expansion coefficient. Graphene has great application potential. So far, graphene prepared by CVD growth method has attracted widespread attention because of its large area, high quality, and easy operation. However, the existing research results show that the mobility of graphene devices prepared by CVD method is roughly 1000-10000 cm 2 / V·s, far less than the theoretical value of 200000cm 2 / V s, it can be seen that the electrical properties of graphene prepared by CVD still need to be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/02C30B25/18
Inventor 张浩然于广辉张燕辉张亚欠陈志蓥隋妍萍
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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