Electrochemical composite doping method of graphene

A kind of graphene electrochemical and compound doping technology, applied in circuits, electrical components, cable/conductor manufacturing, etc., can solve the weak interaction between small molecule dopants and graphene, limit the practical application of graphene, graphene square resistance Increase and other problems, to achieve the effect of uniform and stable doping effect, low cost and high controllability

Active Publication Date: 2016-06-01
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the physically adsorbed small molecule dopants have weak interaction with graphene, are easy to migrate and volatilize, and the square resistance of graphene continues to increase during the placement process, which severely limits the practical application of graphene.

Method used

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  • Electrochemical composite doping method of graphene

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Experimental program
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Effect test

Embodiment 1

[0021] A kind of graphene electrochemical composite doping method of the present embodiment is as figure 1 As shown, the steps are as follows:

[0022] Step 1, preparing an aqueous electrolyte solution containing 0.1mol / L p-toluenesulfonic acid (TSO) and 0.03mol / L 3,4-ethylenedioxythiophene (EDOT);

[0023] Step 2, using the copper foil 001 grown with graphene 002 as the working electrode, the counter electrode being a platinum plate electrode, and the reference electrode being an Ag / AgCl electrode of saturated potassium chloride;

[0024] Step 3, immerse the electrode in the electrolyte solution, select the potential range of -800 ~ 1500mV to polymerize, and electrify for 3 minutes to obtain poly 3,4-ethylenedioxythiophene (PEDOT) film 003, with a thickness of about 5nm, to obtain PEDOT film 003 / graphene 002 / composite structure of growth base copper foil 001, the composite structure is as follows figure 2 shown;

[0025] Step 4, soak the PEDOT film 003 in ethanol, wash it...

Embodiment 2

[0029] A kind of graphene electrochemical composite doping method of the present embodiment is as figure 1 As shown, the steps are as follows:

[0030] Step 1, preparing an aqueous electrolyte solution containing 0.2mol / L p-toluenesulfonic acid (TSO) and 0.05mol / L pyrrole;

[0031] Step 2, using the copper foil 001 grown with graphene 002 as the working electrode, the counter electrode being a platinum plate electrode, and the reference electrode being an Ag / AgCl electrode of saturated potassium chloride;

[0032] Step 3: Immerse the electrode in the electrolyte solution, select the potential range of -200 to 900mV for polymerization, and electrify for 5 minutes to obtain polypyrrole film 003 with a thickness of about 7nm, forming a composite structure of polypyrrole film 003 / graphene 002 / growth substrate copper foil 001 , this composite structure is as figure 2 shown;

[0033] Step 4, immersing the polypyrrole film in deionized water, washing for 3 minutes and drying;

...

Embodiment 3

[0037] A kind of graphene electrochemical composite doping method of the present embodiment is as figure 1 As shown, the steps are as follows:

[0038] Step 1, preparing an aqueous electrolyte solution containing 1mol / L oxalic acid and 0.02mol / L aniline;

[0039] Step 2, using the copper foil 001 grown with graphene 002 as the working electrode, the counter electrode being a platinum plate electrode, and the reference electrode being an Ag / AgCl electrode of saturated potassium chloride;

[0040] Step 3: Immerse the electrode in the electrolyte solution, select the potential range of -500 to 1500mV for polymerization, and energize for 10 minutes to obtain polyaniline film 003 with a thickness of about 10nm, forming a composite structure of polyaniline film 003 / graphene 002 / growth substrate copper foil 001 , this composite structure is as figure 2 shown;

[0041] Step 4, immerse the polyaniline film 003 in isopropanol, clean it for 2 minutes and dry it;

[0042] Step 5: Sep...

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Abstract

The invention relates to an electrochemical composite doping method of graphene. The method comprises steps as follows: Step 1, an electrolyte solution is prepared; Step 2, a copper foil substrate with graphene growing is soaked in the electrolyte solution, and a power supply is connected to be used as a working electrode; Step 3, the power supply is started, a layer of conductive macromolecules are electrically polymerized on the surface of the graphene attached to the copper foil substrate, and a composite structure of conductive macromolecules/graphene/copper foil is formed; Step 4, the conductive macromolecules/graphene/copper foil are taken out, soaked in a cleaning agent for rinsing and dried; Step 5, the conductive macromolecules/graphene are separated from the copper foil and transferred to a target substrate. The method has the beneficial effects as follows: the electrochemical polymerization method which is high in controllability, simple and easy to implement is adopted, a high-conductivity doped layer with uniform thickness is formed on the surface of the graphene in situ, and the uniform and stable doping effect is realized for the graphene; besides, a formed conductive macromolecule membrane can effectively support a graphene membrane and enhance the mechanical strength of the graphene membrane.

Description

technical field [0001] The invention relates to the technical field of graphene production, in particular to a graphene electrochemical composite doping method. Background technique [0002] Graphene is a new type of two-dimensional carbon nanomaterial discovered in the past ten years, which has excellent mechanical, thermal, optical, electrical and other properties. Among them, the extremely high transmittance and ultra-high carrier mobility make it a new transparent conductive material that has attracted the attention of the industry. [0003] At present, for two-dimensional continuous graphene film products, electrical properties are the core key properties. The existing relatively mature graphene film prepared by chemical vapor deposition (CVD) has a high square resistance and cannot be used directly. It must be doped to reduce the square resistance. Most of the current mainstream doping methods use small molecules as dopants, such as ethylenediamine, nitric acid, chlo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D9/02H01B13/00
CPCC25D9/02H01B13/0026
Inventor 姜浩马金鑫黄德萍李朝龙高翾李占成徐鑫史浩飞
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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