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Method for preparing suspended graphene support film of Janus structure

A technology of graphene film and graphene film, which is applied in the field of materials, can solve the problems of pollutants, introduction of graphene surface, restrictions on wide application, etc., and achieve the effect of simple process, high integrity and wide range of contact angle

Active Publication Date: 2019-05-31
PEKING UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the currently prepared graphene support films are often hydrophobic, which is caused by the introduction of pollutants on the graphene surface during the preparation, transfer and storage of graphene films.
Hydrophobic graphene surfaces are often unable to effectively load samples in aqueous phase solutions, which greatly limits their wide application in electron microscopy support membranes, so it is necessary to hydrophilize the graphene surface

Method used

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  • Method for preparing suspended graphene support film of Janus structure
  • Method for preparing suspended graphene support film of Janus structure
  • Method for preparing suspended graphene support film of Janus structure

Examples

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Embodiment 1

[0073] Example 1, preparation of Janus suspended graphene support film

[0074] figure 1 It is a process flow diagram of the present invention. A specific implementation process is as follows:

[0075] (1) Spot electrochemical polishing of copper foil: the electrolyte is phosphoric acid: ethylene glycol solution with a volume ratio of 3:1, the current is 0.3-1.0A, and the polishing time is 20-30min.

[0076] (2) Growth of graphene: heat up the copper foil substrate to 1030° C. and anneal in 100 sccm argon for 30 minutes, keep the pressure at about 100 Pa, and then reduce it with 100 sccm hydrogen for 10 minutes. Finally, the graphene is grown in an atmosphere of 500-1000 sccm hydrogen and 1 sccm methane, the pressure is 0.5-5KPa, and the growth time is 0.5-5 hours.

[0077] (3) prepare suspended graphene film: (1) air plasma cleaning machine (Germany Diener, Pico model) etch away the graphene film on metal substrate side, gas volume is 10sccm, and power is 200W, and process...

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Abstract

The invention discloses a method for preparing a suspended graphene support film of a Janus structure. The method comprises the steps that a graphene thin film is grown on the metal substrate surfacethrough a chemical vapor deposition method, then a suspended graphene thin film is prepared, finally obtained suspended graphene is placed in a plasma cleaner, and the graphene surface is functionalized to obtain the Janus graphene support film which is controllable in hydrophilicity and hydrophobicity and high in integrity (more than 80%). The preparation method is simple in process, and the hydrophilicity and hydrophobicity of the graphene can be regulated through one-step plasma treatment; the patterned Janus suspended graphene support film can be prepared by additionally arranging a mask plate. The contact angle range of the obtained graphene support film is wide (50-90 degrees), the contact angle range (60-80 degrees) of a commercial amorphous carbon electron microscopy supporting membrane is covered, and effective loading and high resolution imaging of water-soluble samples such as biological protein and nano-particles are facilitated.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a method for preparing a suspended graphene supporting film with a Janus structure. Background technique [0002] Graphene has excellent electrical, mechanical, and optical properties, and has good application prospects in the fields of support membranes and filter membranes. In the field of supporting films for transmission electron microscopy, graphene is an ideal supporting film. The regularly arranged carbon monoatomic layers hardly introduce background interference to electron microscope characterization, and can even provide extremely high contrast for single atoms and small organic molecules. In addition, graphene's good electrical and thermal conductivity can reduce the radiation damage of electrons to samples, and its high mechanical strength ensures effective loading of samples. However, the currently prepared graphene support films are often hydrophobic, which is caused by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/194C01B32/186G01N23/2202G01N23/2251G01N23/2204
Inventor 彭海琳郑黎明邓兵王雅妮
Owner PEKING UNIV
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