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Method for transferring and washing graphene film

A technology of graphene film and exfoliated graphene, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of affecting the integrity of graphene, reducing the mobility of graphene, and easy damage, so as to avoid damage, Effect of reducing surface tension and eliminating hydrogen bubbles

Active Publication Date: 2012-07-18
WUXI GRAPHENE FILM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But on the one hand, a large number of hydrogen bubbles continuously generated by electrolyzed water will adhere to the surface of the graphene film. When the graphene film is transferred to the target substrate, these bubbles are sandwiched between the graphene film and the target substrate, so that the graphene cannot It is closely combined with the target substrate, causing the area with bubbles to be easily damaged in the subsequent processing process, which seriously affects the integrity of graphene; A large number of metal ions and metal oxides remain on the surface, reducing the mobility of graphene

Method used

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Examples

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Effect test

Embodiment 1

[0048] A method for transferring and cleaning a large-scale graphene film prepared by CVD, comprising the following steps:

[0049] (1) spin coating polymethyl methacrylate (PMMA) solution on the surface of graphene film layer, place 1 hour to make solvent volatilize completely and form PMMA film; (2) adding concentration is 0.02M ammonium persulfate ( (NH 4 ) 2 S 2 o 8 ) solution, put the graphene / copper foil coated with protective layer as negative electrode into (NH 4 ) 2 S 2 o 8 In the electrolyte, a voltage of 8V is applied, and the hydrogen bubbles generated by the electrolysis of water separate the graphene film layer from the copper foil at the boundary, and chemical etching reactions and electrochemical deposition reactions occur simultaneously at the interface between the graphene film and copper foil. The film is gradually separated from the surface of the copper foil, and after the peeling is complete, the voltage is canceled; (3) add sodium dodecylbenzenesu...

Embodiment 2

[0051] A method for transferring and cleaning a large-scale graphene film prepared by CVD, comprising the following steps:

[0052] (1) stick the polydimethylsiloxane (PDMS) sheet to the surface of the graphene film layer, and let it stand for 1 hour to remove air bubbles; (2) add a concentration of 0.04M K to the electrolytic cell 2 SO 4 solution and 0.02M (NH 4 ) 2 S 2 o 8 solution, put the graphene / copper foil coated with protective layer as negative electrode into K 2 SO 4 and (NG 4 ) 2 S 2 o 8 In the electrolyte, a voltage of 5V is applied, and the hydrogen bubbles generated by the electrolysis of water separate the graphene film layer from the copper foil at the boundary, and chemical etching reactions and electrochemical deposition reactions occur simultaneously at the interface between the graphene film and copper foil. The film is gradually separated from the surface of the copper foil, and after the peeling is complete, the voltage is canceled; (3) add poly...

Embodiment 3

[0054] A method for transferring and cleaning a large-scale graphene film prepared by CVD, comprising the following steps:

[0055] (1) stick polymethyl ethyl acrylate (PEMA) flake to the surface of graphene film layer, leave standstill 1.2 hours to remove air bubble; (2) add concentration and be 0.05M HNO in the electrolytic cell 3 solution, put the graphene / nickel substrate coated with protective layer as negative electrode into HNO 3 In the electrolyte, a voltage of 1V is applied, and the hydrogen bubbles generated by the electrolysis of water separate the graphene film layer on the boundary from the nickel substrate, and chemical etching reactions and electrochemical deposition reactions occur simultaneously at the interface between the graphene film and the nickel substrate. Graphene thin film is separated from nickel substrate surface gradually, and after peeling off completely, cancel voltage; (3) add ethanol in electrolytic solution by 30wt%, reduce the surface tension...

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Abstract

The invention relates to a method for transferring and washing a graphene film, which belongs to the field of graphene film materials. An electrochemical method is used for peeling the graphene film, and a wetting agent is added in the used electrolyte after the graphene film is obtained by peeling. The method can achieve reutilization of a metal growth substrate, the obtained graphene film has good integrity and electrical conductivity, simultaneously the method for transferring and washing the graphene film has the advantages of being strong in applicability, low in cost and short in period and having wide application prospect.

Description

technical field [0001] The present invention relates to the field of graphene electronic thin film materials, in particular to a method for transferring and cleaning graphene thin films, more specifically, to a method for non-destructively transferring graphene thin films grown on metal substrates to target substrates and cleaning them Methods. Background technique [0002] Graphene is a single-atom layer two-dimensional crystal in which carbon atoms are closely packed in a hexagonal structure, and the intrinsic mobility of carriers can reach 2×10 5 cm 2 / (V·S), this excellent electrical property makes it have great application value in high-frequency electronic devices. In order to fabricate graphene electronic devices, the primary problem is to prepare large-scale graphene films with excellent electrical properties and transfer them to suitable target substrates. The preparation method of graphene mainly comprises the following several: (1) adhesive tape stripping metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/194
CPCC01B31/0446C01B31/04C01B31/0484C25B1/00C01B32/184C01B32/194C25F5/00
Inventor 黄孟琼王振中
Owner WUXI GRAPHENE FILM
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