Method for preparing graphene/polyaniline laminated films on basis of layer-by-layer self-assembly technique

A layer-by-layer self-assembly and composite film technology, which is applied in the field of composite material preparation, can solve problems such as cumbersome methods, structure, and performance impact, and achieve the effects of low technical cost, mild conditions, and simple operation

Inactive Publication Date: 2012-11-21
JIANGNAN UNIV +2
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  • Claims
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Problems solved by technology

This method is cumbersome, and the reduction process of graphene will affe

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  • Method for preparing graphene/polyaniline laminated films on basis of layer-by-layer self-assembly technique

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Example Embodiment

[0016] Example 1

[0017] In the first step, 10 mg of graphene oxide was suspended and dispersed in 20 mL of ultrapure water. Ultrasonic dispersion for 30 minutes (S45D, 500W, 30% amplitude) to obtain a brown GO dispersion. The obtained dispersion is mixed with 20 ml volume of ultrapure water, 1 ml of hydrazine hydrate solution (85% mass fraction), and 70-145 μL of ammonia water (30% mass fraction) in a 100 mL flask. After shaking vigorously or stirring for a few minutes, the container was placed in a 95°C water bath to react for 60 minutes. The reaction solution was dialyzed in 0.5wt% ammonia water to remove excess hydrazine in the remaining dispersion to obtain a surface with 0.25mg / mL Graphene dispersion of carboxyl groups.

[0018] In the second step, the preparation of the aqueous solution of polyaniline dissolve the prepared dark green aniline in DMAC (dimethylacetamide) to prepare a 120mg / mL solution, stir for 48h, and then ultrasonicate for 8-10h. Filter the prepared solu...

Example Embodiment

[0022] Example 2

[0023] The first step is to suspend and disperse 10mg graphene oxide in 20mL ultrapure water and ultrasonically disperse for 30min, using 5wt% Na 2 CO 3 The solution adjusts the graphene oxide solution pH to 9-10, then adds sodium borohydride solution, and reacts at 80°C for 1 hour. After centrifugal washing for several times, the pre-reduced graphene oxide is obtained by re-dispersing in water after ultrasonic vibration. Under ice bath conditions (0-5°C), mix 460mg p-aminobenzenesulfonic acid and 0.66g1M ice HCl solution, add an appropriate amount of ice water to completely dissolve it, and then slowly add 15% NaNO dropwise 2 Solution. The prepared aryl diazonium salt was added dropwise to the pre-reduced graphene oxide solution prepared in the first step, and reacted in an ice bath for 2 hours. Centrifugal washing several times, after ultrasonic vibration, re-dispersed in water. Then, hydrazine hydrate was added to it and reacted at 100°C for 24 hours. Aft...

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Abstract

The invention relates to a method for preparing graphene/polyaniline laminated films on basis of a layer-by-layer self-assembly technique and belongs to the technical field of composite material preparation. The method includes steps of treating a substrate; soaking the treated substrate in a graphene dispersing agent for a period; taking the substrate out of the graphene dispersing agent and cleaning the substrate with deionized water; soaking the cleaned substrate into polyaniline solution for a period and then taking out the substrate and cleaning the same again; and repeating the steps above to obtain uniform graphene-polyaniline laminated films having regular layer structures. The conductive graphene/polyaniline laminated films prepared by the method are uniform, regular and ultrathin and have controllable structures and properties. The method can be carried out with low-cost and simple equipment under mild conditions, and can be used for the fields of sensors, supercapacitors and the like.

Description

technical field [0001] The invention belongs to the field of composite material preparation, in particular to a method for preparing a graphene / polyaniline composite film based on layer-by-layer self-assembly technology. Background technique [0002] In recent years, conductive thin films based on conductive polymers have attracted more and more attention due to their light weight, small size, and good electrical conductivity. [0003] Graphene has a unique structure and excellent electrical, thermal, and mechanical properties. Since it was successfully prepared in 2004, it has been a research hotspot all over the world. The combination of graphene and conductive polymers has received extensive attention. The long-range conjugated structure of polyaniline endows it with unique electrical and optical properties. The graphene-polyaniline composite material obtained by combining graphene and polyaniline can synthesize graphite. The respective performance characteristics and ad...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L79/02C08K9/00C08K3/04
Inventor 罗静马强陈宇泽朱正意
Owner JIANGNAN UNIV
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