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A kind of preparation method of graphene/silver nanowire composite airgel

A composite airgel and silver nanowire technology, applied in the field of nanomaterials, can solve problems such as low mechanical strength and electrical conductivity, irregular spatial arrangement of graphene sheets, complex template removal process, etc., to achieve enhanced electrical conductivity, Environmentally friendly and mild reaction conditions

Active Publication Date: 2021-06-29
LUOYANG INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above problems, the present invention provides a preparation method of graphene / silver nanowire composite airgel, to solve the complex template removal process, low mechanical strength and electrical conductivity and the spatial arrangement of graphene sheets in the above-mentioned graphene airgel preparation. The problem of irregular cloth structure

Method used

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  • A kind of preparation method of graphene/silver nanowire composite airgel
  • A kind of preparation method of graphene/silver nanowire composite airgel
  • A kind of preparation method of graphene/silver nanowire composite airgel

Examples

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Effect test

Embodiment 1

[0029] (1) Add 1.0g of metallic sodium and 20mL of o-xylene solvent into a glass container, heat until the temperature reaches 100°C, and the metallic sodium turns into bright yellow sodium balls;

[0030] (2) 10mL concentration is the graphene oxide solution of 10mg / mL and the silver nanowire dispersion liquid that 10mL concentration is 0.4mg / mL obtains the mixed dispersion liquid of graphene oxide-silver nanowire after mixing under ultrasonic;

[0031] (3) In the graphene oxide-silver nanowire mixed dispersion liquid that step (2) obtains, add the polyacrylate particle that 0.2g particle diameter is 20~100nm, form graphene oxide, silver nanowire and template particle after stirring Colloidal mixture;

[0032] (4) 0.2g sodium silicate cross-linking agent is added in the colloidal mixed solution that step (3) obtains and mixes uniformly, then add dropwise in the system that step (1) forms, due to density difference, aqueous phase graphene oxide, silver Nanowires and polyacryl...

Embodiment 2

[0040] (1) Add 5.0g of metallic sodium and 30mL of vegetable oil into a glass container, heat until the temperature reaches 120°C, and the metallic sodium turns into bright yellow sodium balls;

[0041] (2) 10mL concentration is the graphene oxide solution of 20mg / mL and the silver nanowire dispersion liquid that 10mL concentration is 1mg / mL is mixed under ultrasonic to obtain the mixed dispersion liquid of graphene oxide-silver nanowire;

[0042] (3) Add 1.0 g of polylactic acid particles to the graphene oxide-silver nanowire mixed dispersion obtained in step (2), with a particle size of 20 to 100 nm, and form a colloid of graphene oxide, silver nanowires and template particles after stirring mixed solution;

[0043] (4) Add 1.0g of silica cross-linking agent into the colloidal mixture obtained in step (3) and mix evenly, then add dropwise in the system formed in step (1), due to density difference, water phase graphene oxide, silver The nanowires and polylactic acid particl...

Embodiment 3

[0050] (1) Add 3.0g of metallic sodium and 50mL of diethyl ether solvent into a glass container, heat until the temperature reaches 80°C, and the metallic sodium turns into bright yellow sodium balls;

[0051] (2) 10mL concentration is the graphene oxide solution of 15mg / mL and the silver nanowire dispersion liquid that 10mL concentration is 0.5mg / mL obtains the mixed dispersion liquid of graphene oxide-silver nanowire after ultrasonic mixing;

[0052] (3) Add 0.5g polyacrylamide particles in the graphene oxide-silver nanowire mixed dispersion liquid that step (2) obtains, particle diameter is 20~100nm, forms graphene oxide, silver nanowire and template particle after stirring Colloidal mixture;

[0053] (4) Add 0.5g sodium titanate cross-linking agent to the colloidal mixture obtained in step (3) and mix evenly, then add dropwise in the system formed in step (1), due to the difference in density, the aqueous phase graphene oxide, silver Nanowires and polyacrylamide particles...

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Abstract

The invention relates to a preparation method of graphene / silver nanowire composite airgel. First prepare the colloidal dispersion of graphene oxide-silver nanowires containing template particles, then mix the mixed solution with a crosslinking agent and add it dropwise to a system formed by metal sodium and an organic solvent. Due to the difference in density, the mixed system forms an oil ‑Water two-phase, metal sodium reacts with graphene oxide and water at the interface between the two phases to reduce graphene oxide in situ, and the heat released from the reaction promotes chemical bridging reaction between graphene oxide and cross-linking agent to build a spatial network structure Support strength, the template particles are wrapped in the airgel pores to control the pore size; the silver nanowires are distributed on the surface of the graphene as the elastic support and conductivity enhancing unit of the airgel, and finally the template particles are removed by freeze-drying. The invention utilizes the principle of "water absorption swelling-syneresis" of the polymer template, and the removal of the template is easy; the graphene oxide can realize in-situ reduction without additional reducing agent, and the preparation method is simple.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, in particular to a preparation method of graphene / silver nanowire composite airgel. Background technique [0002] The template method is a common method for preparing three-dimensional graphene airgel materials. For example, using polystyrene (PS) particles as a template, a three-dimensional airgel can be prepared by vacuum filtering a mixed colloidal suspension of chemically modified graphene and PS spheres. ordered macroporous graphene membrane. Surface-modified silicon dioxide (SiO 2 ) spheres as templates, using graphene oxide hydrophilic edges and SiO 2 Hydrophobic interactions between spherical (30-120nm) hydrophobic-based planes construct nanoporous graphene aerogels. However, the methods reported so far need to use organic solvents (such as toluene) or strong acids (such as hydrofluoric acid) to dissolve or etch the template particles to remove them, which generally have de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184B82Y30/00B01J13/00B22F9/24
CPCB01J13/0091B22F9/24B82Y30/00C01B32/184
Inventor 高亚辉尹国杰王芳孟巧静李欣栋
Owner LUOYANG INST OF SCI & TECH
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