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Preparation method of polyaniline-graphene hollow microspheres

A technology of hollow microspheres and graphene, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as the gap in theoretical specific surface area, and achieve the effects of improved electrochemical performance, mild reaction conditions, and low cost

Active Publication Date: 2017-02-22
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Two-dimensional graphene composite materials have improved the specific surface area of ​​graphene to a certain extent, but there is still a large gap compared with the theoretical specific surface area of ​​graphene. Therefore, researchers have begun to explore three-dimensional graphene composites with larger specific surface areas. materials for high performance graphene devices

Method used

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  • Preparation method of polyaniline-graphene hollow microspheres
  • Preparation method of polyaniline-graphene hollow microspheres
  • Preparation method of polyaniline-graphene hollow microspheres

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Disperse 90 mg of graphene oxide in 20 mL of water by ultrasound, and use hydrazine hydrate as a reducing agent to reduce GO to graphene (RGO); disperse the freshly prepared RGO in 25 mL of water; add 227 mg of p-sulfanil to the RGO dispersion acid (SA) and 115 mg of isoamyl nitrite, stirred overnight at 80° C.; filtered, washed and dried to obtain sulfonic acid-modified graphene (GSA). Take 9 mg of the sulfonated graphene obtained above, add 3 mL of water, and ultrasonicate for 40 minutes at an ultrasonic power of 200 W as the water phase; add 3 mL of oil phase toluene (the oil phase contains 120 μL of aniline monomer), and use a homogenizer at 15000 rpm Emulsify for 2 minutes to obtain an oil-in-water (O / W) emulsion (see figure 1 ); place the prepared emulsion in a 0°C ice-water bath after standing for 18 hours, stir for 40 minutes, and the stirring speed is 300rpm; in addition, dissolve 285mg of ammonium persulfate in 1mol / L hydrochloric acid solution, and place in ...

Embodiment 2

[0035]60mg of graphene oxide was dispersed in 12mL of water by ultrasound, and GO was reduced to graphene (RGO) using hydrazine hydrate as a reducing agent; the newly prepared RGO was dispersed in 20mL of water; 45mg of sulfanil was added to the RGO dispersion acid (SA) and 27 mg of isoamyl nitrite, stirred overnight at 80° C.; filtered, washed and dried to obtain sulfonic acid-modified graphene (GSA). Take 15 mg of the sulfonated graphene obtained above, add 5 mL of water, and ultrasonicate for 60 minutes at an ultrasonic power of 400 W as the water phase; add 3 mL of oil phase toluene (the oil phase contains 24 μL of aniline monomer), and use a homogenizer at 8000 rpm Emulsify for 1 minute to obtain an oil-in-water (O / W) emulsion; place the prepared emulsion in an ice-water bath at 0°C after standing for 24 hours, and stir for 30 minutes at a stirring speed of 500 rpm; dissolve 23.5 mg of ammonium persulfate in 2mol / L hydrochloric acid solution, placed in 0°C ice-water bath ...

Embodiment 3

[0037] Disperse 90mg of graphene oxide in 20mL of water by ultrasound, and use hydrazine hydrate as a reducing agent to reduce GO to graphene (RGO); disperse the newly prepared RGO in 20mL of water; add 450mg of p-sulfanil to the RGO dispersion acid (SA) and 270mg of isoamyl nitrite, stirred overnight at 80°C; filtered, washed and dried to obtain sulfonic acid-modified graphene (GSA). Take 15 mg of the sulfonated graphene obtained above, add 10 mL of water, and ultrasonicate for 40 minutes at an ultrasonic power of 200 W as the water phase; add 5 mL of oil phase toluene (the oil phase contains 250 μL of aniline monomer), and use a homogenizer at 15000 rpm Emulsify for 2 minutes to obtain an oil-in-water (O / W) emulsion; place the prepared emulsion in an ice-water bath at 0°C after standing for 18 hours, and stir for 40 minutes at a stirring speed of 250 rpm; dissolve 85 mg of ammonium persulfate in 1.5 mol / L hydrochloric acid solution, placed in an ice-water bath at 0°C for 30 ...

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Abstract

The invention discloses a preparation method of polyaniline-graphene hollow microspheres. Firstly, isoamyl nitrite and sulfanilic acid are utilized to sulfonate graphene, the obtained sulfonated graphene is used as a Pickering emulsifier, water dispersion liquid of the obtained sulfonated graphene serves as a water phase, and toluene or an aniline monomer serves as an oil phase to perform emulsification, an oil-in-water (O / W) emulsion is obtained, then an oxidizing agent ammonium persulfate is added to trigger aniline polymerization, and the polyaniline-graphene hollow microspheres can be obtained after the oil phase toluene is removed. The polyaniline-graphene hollow microspheres are prepared by adopting a Pickering emulsion method. The preparation method is simple and efficient, and the prepared polyaniline-graphene hollow microsphere material with a three-dimensional hollow structure has larger specific surface area and a shorter ion and electron transmission path compared with a polyaniline-graphene composite material with a two-dimensional structure and has a greater potential application value on the aspects of catalysis, micro-reactors, sensing, energy storage materials and the like.

Description

[0001] Technical field: [0002] The invention relates to the field of preparation of graphene composite materials, in particular to a preparation method of polyaniline-graphene hollow microspheres. [0003] Background technique: [0004] Graphene is a two-dimensional crystal with a single-layer atomic thickness composed of carbon atoms. It has the characteristics of large specific surface area, high electrical conductivity, good mechanical stability and excellent electrochemical performance. It is widely used in supercapacitors, field effect transistors, sensors, etc. field has attracted extensive attention from researchers. However, graphene is very prone to agglomeration, resulting in a greatly reduced specific surface area, which affects the performance of graphene in practical applications. According to these characteristics of graphene, graphene can be combined with various functional materials to improve the electrical and thermal properties of graphene. Polyaniline is...

Claims

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Application Information

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IPC IPC(8): C08L79/02C08K3/04C08J9/28C08G73/02C01B32/194
CPCC08G73/0266C08J9/28C08J2379/02C08K3/04C08L79/02
Inventor 罗静郑媛刘晓亚
Owner JIANGNAN UNIV
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