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Method for preparing large-sized thin film by mechanically exfoliating graphene nanoplatelets and solar cell

A graphene micro-sheet and mechanical stripping technology, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems affecting the health of operators, environmental pollution, and high production costs, and avoid the use of highly toxic organic reactants, Simple process operation, simple process effect

Inactive Publication Date: 2016-04-20
魏颖
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method avoids the use of high-temperature state and high-risk gas, the size of graphene is limited by the use of large-size graphite as a raw material in this method, and it is impossible to obtain a large-size graphene film that can be directly applied
The reducing agent of this method is poisonous hydrazine or hydrazine hydrate, which not only has high production cost, but also pollutes the environment and affects the health of operating workers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Mix 1kg of dense crystalline graphite and 10g of tetraethylammonium bicarbonate evenly and put it into the continuous screw reaction extruder, set the temperature of the continuous screw reaction extruder to 60°C, the extrusion pressure 20MPa, the screw speed of the screw extruder 100 revolutions per minute, the solid product obtained by extrusion is graphene prefabricated slag. Next, place the graphene prefabricated slag in a container filled with 2 kg of deionized water, and ultrasonically vibrate for 2 hours with an ultrasonic power of 120W. After standing for 1 hour, a well-dispersed graphene dispersion in the upper layer and a graphene dispersion that has not been peeled off in the lower layer are obtained. Graphite particle mixture. Gradually add 2kg of dodecane to the surface of the upper graphene dispersion to form an immiscible liquid / liquid interface between the dodecane and the graphene dispersion. Suspend inorganic glass with a plane size of 5cm×5cm in the ...

Embodiment 2

[0030] Put 1kg flake graphite and 10g sodium dodecylsulfonate into the continuous screw reaction extruder after mixing evenly, set the temperature of the continuous screw reaction extruder to 160°C, the extrusion pressure is 40MPa, and the screw speed of the screw extruder is 200 revolutions per minute, extrude to obtain a solid product that is graphene prefabricated slag. Next, place the graphene prefabricated slag in a container filled with 2 kg of deionized water, and ultrasonically vibrate for 2 hours with an ultrasonic power of 120W. After standing for 1 hour, a well-dispersed graphene dispersion in the upper layer and a graphene dispersion that has not been peeled off in the lower layer are obtained. Graphite particle mixture. Gradually add 2kg of dodecane to the surface of the upper graphene dispersion to form an immiscible liquid / liquid interface between the dodecane and the graphene dispersion. Suspend the transparent plexiglass with a plane size of 5cm×5cm in the ab...

Embodiment 3

[0033] Mix 1kg of dense crystalline graphite and 10g of tetraethylammonium bicarbonate evenly and put it into the continuous screw reaction extruder, set the temperature of the continuous screw reaction extruder to 60°C, the extrusion pressure 20MPa, the screw speed of the screw extruder The solid product obtained by extrusion is 600 rpm, which is graphene prefabricated slag. Next, place the graphene prefabricated slag in a container filled with 2 kg of deionized water, and ultrasonically vibrate at 300W for 7 hours with an ultrasonic power. Graphite particle mixture. Gradually add 2kg of kerosene to the surface of the upper graphene dispersion to form an immiscible liquid / liquid interface between the kerosene and the graphene dispersion. Suspend the inorganic glass with a plane size of 5cm×5cm in the above mixed solution, make the lower surface of the inorganic glass contact with the liquid / liquid interface, immerse the inorganic glass block in kerosene, control the cooling ...

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PUM

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Abstract

The invention discloses a method for preparing a large-sized thin film by mechanically exfoliating graphene nanoplatelets and a solar cell. The large-sized thin film can be obtained by exfoliating graphite by adopting the shearing force provided by a continuous screw extruder, dispersing the graphite into deionized water, adding a hydrophobic solvent, suspending a substrate material in the hydrophobic solvent, cooling to cure the hydrophobic solvent, taking the substrate out, and removing hydrophobic solvent impurities between and around the graphene and the substrate material. According to the method, a thin graphene layer formed by self-assembly of the graphene at an insoluble liquid / liquid interface is protected by utilizing a cooling curing mode; the thin graphene layer is exfoliated from the dispersion liquid through a physical effect; the working environments of high-temperature environment and high-risk gas are avoided, and the use of a highly toxic organic reagent is avoided, so that the method has a broad market application value.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a mechanical stripping preparation of a large-scale graphene microsheet film and a solar cell. Background technique [0002] Graphene is a material with excellent electrical conductivity. Its superior properties such as high Young's modulus, thermal conductivity, high carrier mobility, and huge theoretical calculation value of specific surface area make graphene very Broad development prospects. [0003] Large-scale preparation of large-scale graphene films is a prerequisite for the industrialization of the graphene electronics industry. At present, large-scale graphene films are usually prepared by metal-catalyzed methods, which makes it difficult to produce and apply on a large scale, and the cost is extremely high. For example, Chinese Patent Publication No. 103255474A discloses a method for preparing large-scale single-crystal graphene, which is characteriz...

Claims

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Application Information

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IPC IPC(8): C01B31/04H01L31/028H01L31/043
CPCH01L31/028H01L31/042Y02E10/547
Inventor 陈庆曾军堂叶任海
Owner 魏颖
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