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Micro-oxidized graphene and preparation method thereof

A graphene and fossil technology, applied in the field of micro-graphene oxide and its preparation, can solve problems such as unfavorable production and application, dangerous use process, long reaction time, etc., to overcome uncontrollable activation, high cost input, and lattice defects. less effect

Active Publication Date: 2015-03-04
XIAMEN KNANO GRAPHENE TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, there are disadvantages in the reduction method: the first method has high reaction temperature and high equipment requirements; in the second method, because the hydrazine reducing agent is a toxic reagent, the use process is dangerous and the reaction time is long, which is not conducive to large-scale production and application.
Secondly, the surface of the graphene generated by this reduction is easy to cause defects, forming a pentagonal or heptagonal lattice, coupled with the incomplete reduction, the electrical conductivity is usually very low

Method used

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  • Micro-oxidized graphene and preparation method thereof
  • Micro-oxidized graphene and preparation method thereof
  • Micro-oxidized graphene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Mix 10g of mechanically exfoliated graphene, 50g of potassium hydroxide, and 500g of water, stir and ultrasonically for 1 hour to obtain a uniform viscous dispersion; transfer the dispersion to a crucible, place it in a microwave oven for 15 minutes; wash the microwaved product repeatedly with water and suction filtration to remove potassium hydroxide until the filtrate is neutral and dried to obtain a solid; weigh 5 g of the above solid, mix with 15 g potassium permanganate and 250 g water, react in the reactor for 2 hours, and set the reaction temperature to 150 °C After the reaction, the product is taken out, repeatedly washed with water and suction filtered to remove excess potassium permanganate, and dried to obtain a micro-graphene oxide product.

Embodiment 2

[0035] Mix 10g of mechanically exfoliated graphene, 40g of sodium hydroxide, and 200g of water, and stir for 1.5 hours with ultrasound to obtain a uniform viscous dispersion; transfer the dispersion to a crucible, and place it in a microwave oven for 15 minutes; wash the microwaved product repeatedly with water and suction filtration to remove sodium hydroxide until the filtrate is neutral and dried to obtain a solid; weigh 5 g of the above solid, mix with 15 g potassium permanganate and 250 g water, react in the reactor for 2 hours, and set the reaction temperature to 150 °C After the reaction, the product is taken out, repeatedly washed with water and suction filtered to remove excess potassium permanganate, and dried to obtain a micro-graphene oxide product.

Embodiment 3

[0037] Mix 10g of mechanically exfoliated graphene, 40g of potassium hydroxide, and 500g of water, stir and ultrasonically for 1 hour to obtain a uniform viscous dispersion; transfer the dispersion to a crucible, place it in a microwave oven for 15 minutes; wash the microwaved product repeatedly with water and suction filtration to remove potassium hydroxide until the filtrate is neutral and dried to obtain a solid; weigh 5 g of the above solid, mix with 15 g of potassium chlorate and 250 g of water, react in a reactor for 2 hours, and set the reaction temperature to 150 ° C; after the reaction The product is taken out, repeatedly washed with water and suction filtered to remove excess potassium chlorate, and dried to obtain a micro-graphene oxide product.

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Abstract

The invention belongs to the technical field of graphene materials and in particular relates to micro-oxidized graphene and a preparation method thereof. The micro-oxidized graphene contains a small amount of active groups, is low in degree of oxidation, and has the oxygen element content of 1-10wt% and the bulk density of 0.01-0.1g / ml. The micro-oxidized graphene contains a proper amount of chemical reaction active group points, and meanwhile, a relatively complete graphene lattice structure is remained so that the micro-oxidized graphene has excellent dispersibility, special reactivity and excellent physical properties. The invention provides an industrial micro-oxidized graphene preparation route which is efficient, stable, economical, controllable and environment-friendly and the defects of uncontrollable graphene activation, great operation risks, serious environmental pollution, serious equipment corrosion, high cost investment and the like of a traditional acid oxidation method can be overcome. The micro-oxidized graphene prepared by use of the preparation method has extremely wide prospect in the fields of functional composites, coatings, ink, photoelectric materials, biological medicine and the like.

Description

technical field [0001] The invention belongs to the technical field of graphene materials, in particular to a micro graphene oxide and a preparation method thereof. Background technique [0002] Graphene is a new type of nanomaterial with a single-layer sheet structure composed of carbon atoms. It is a two-dimensional carbon atom crystal with a thickness of one atom. The basic structural unit is the most stable six-membered benzene ring in organic materials. It is currently the most ideal two-dimensional nanomaterials. Graphene has excellent mechanical properties, peculiar electrical properties and good thermal properties. The study found that its Young's modulus can reach 1100GPa, its fracture strength can reach 125GPa, its thermal conductivity can reach 5000W / (m·K), and its theoretical specific surface area can reach as high as 2630m2 / g. It has good application prospects in the fields of thermal conductive composite materials, energy storage materials, field emission mat...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 钱文枝赵立平洪江彬黄卫明邱淑璇
Owner XIAMEN KNANO GRAPHENE TECH CORP
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