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Preparation method for high-concentration graphene-polyaniline nanofiber composite dispersion liquid and high-concentration graphene-polyaniline nanofiber composite film

A nanofiber and composite dispersion technology is applied in the field of preparation of high-concentration graphene-polyaniline nanofiber composite dispersions and composite films, and can solve problems such as difficulty in meeting application requirements, poor processability, and limited application of composite materials. Electrical conductivity improvement, high electrical conductivity, effect of suppressing agglomeration

Inactive Publication Date: 2012-01-18
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This composite material is insoluble and infusible, and it is difficult to disperse in liquid media, so the processability is poor, and it is difficult to meet the application needs of vacuum filtration, spray coating, spin coating and liquid-liquid self-assembly, which limits the application of composite materials. application

Method used

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  • Preparation method for high-concentration graphene-polyaniline nanofiber composite dispersion liquid and high-concentration graphene-polyaniline nanofiber composite film
  • Preparation method for high-concentration graphene-polyaniline nanofiber composite dispersion liquid and high-concentration graphene-polyaniline nanofiber composite film
  • Preparation method for high-concentration graphene-polyaniline nanofiber composite dispersion liquid and high-concentration graphene-polyaniline nanofiber composite film

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Preparation of graphene oxide-polyaniline nanofiber dispersion

[0028] Add graphite oxide and polyaniline nanofibers into distilled water respectively, and obtain a stable graphene oxide dispersion with a concentration of 1 mg / mL and a polyaniline nanofiber dispersion with a concentration of 0.2 mg / mL after ultrasonic dispersion for 2 hours;

[0029] Add the polyaniline nanofiber dispersion dropwise to the graphene oxide dispersion according to the mass ratio of graphene oxide to polyaniline nanofiber is 3:1, after adding an appropriate amount of distilled water, continue ultrasonic dispersion for 2h and adjust the pH of the system to 4 , to obtain a graphene oxide-polyaniline nanofiber dispersion with a total concentration of 0.6 mg / mL;

[0030] 2) Preparation of high-concentration graphene-polyaniline nanofiber composite dispersion

[0031] Under the protection of nitrogen, put the graphene oxide-polyaniline nanofiber composite dispersion in a constant temperatur...

Embodiment 2

[0035] 1) Preparation of graphene oxide-polyaniline nanofiber dispersion

[0036] Add graphite oxide and polyaniline nanofibers into distilled water respectively, and obtain a stable graphene oxide dispersion with a concentration of 1.5 mg / mL and a polyaniline nanofiber dispersion with a concentration of 0.3 mg / mL after ultrasonic dispersion for 2 hours;

[0037] Add the polyaniline nanofiber dispersion dropwise to the graphene oxide dispersion according to the mass ratio of graphene oxide to polyaniline nanofiber is 4:1, after adding an appropriate amount of distilled water, continue ultrasonic dispersion for 2h and adjust the pH value of the system to 4 , to obtain a graphene oxide-polyaniline nanofiber dispersion with a total concentration of 0.8 mg / mL;

[0038] 2) Preparation of high-concentration graphene-polyaniline nanofiber composite dispersion

[0039] Under the protection of nitrogen, put the graphene oxide-polyaniline nanofiber dispersion in a constant temperature ...

Embodiment 3

[0043] 1) Preparation of graphene oxide-polyaniline nanofiber dispersion

[0044] Add graphite oxide and polyaniline nanofibers into distilled water respectively, and obtain a stable graphene oxide dispersion with a concentration of 0.8 mg / mL and a polyaniline nanofiber dispersion with a concentration of 0.2 mg / mL after ultrasonic dispersion for 2 hours;

[0045] According to the mass ratio of graphene oxide to polyaniline nanofibers is 2:1, add polyaniline nanofiber dispersion liquid dropwise to graphene oxide dispersion liquid, after adding appropriate amount of distilled water, continue ultrasonic dispersion for 2h and adjust the pH value of the system to be about 4. Obtain a graphene oxide-polyaniline nanofiber dispersion with a total concentration of 0.7 mg / mL;

[0046] 2) Preparation of high-concentration graphene-polyaniline nanofiber composite dispersion

[0047] Under the protection of nitrogen, put the graphene oxide-polyaniline nanofiber dispersion in a constant te...

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Abstract

The invention relates to a preparation method for a high-concentration graphene-polyaniline nanofiber composite dispersion liquid and a high-concentration graphene-polyaniline nanofiber composite film. The method comprises: respectively adding graphite oxide and polyaniline nanofiber to two parts of distilled water to carry out ultrasonic dispersion to obtain a graphene oxide dispersion liquid and a polyaniline nanofiber dispersion liquid; adding the polyaniline nanofiber dispersion liquid to the graphene oxide dispersion liquid in a dropwise manner, then carrying out ultrasonic dispersion toform a composite dispersion liquid; mixing the composite dispersion liquid and a reducing agent, then carrying out the reaction under conditions of a constant temperature and ultrasonic wave to obtain the graphene-polyaniline nanofiber composite dispersion liquid; carrying out vacuum filtration for the graphene-polyaniline nanofiber composite dispersion liquid to prepare the composite film; adopting dilute acid leaching to prepare the self-supporting composite film with high conductivity. According to the method, the polyaniline nanofiber is adopted as the dispersion stabilizer for the graphene to prepare the high-concentration composite dispersion liquid, such that the problem of difficult removal of the traditional dispersing agent is solved, the synergistic effect of the composite material is easily provided. In addition, the prepared self-supporting composite film has good flexibility and high conductivity.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a preparation method of a high-concentration graphene-polyaniline nanofiber composite dispersion liquid and a composite membrane. Background technique [0002] Since the discovery of graphene in 2004, it is generally believed that graphene will cause revolutionary changes in many fields due to its unique structure and excellent electrical, thermal and mechanical properties. There are many methods for preparing graphene, such as micromechanical exfoliation, chemical vapor deposition, crystal epitaxial growth, and solvent exfoliation, etc., but the poor processability of graphene prepared by these methods limits its large-scale application. The preparation of graphene into a dispersion can greatly improve its processability, making it widely used in the fields of liquid-liquid self-assembly, vacuum filtration and composite materials. However, graphene is composed of...

Claims

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Application Information

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IPC IPC(8): C08J3/03C08L79/02C08K3/04C08J5/18C01B31/04
Inventor 井新利何伟张伟娜李瑜
Owner XI AN JIAOTONG UNIV
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