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Preparation method of graphene-coated silicon dioxide nanoparticles

A technology of graphene coating and silicon dioxide, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problem of incomplete coating, and achieve the effect of good hydrophobicity, simple process and high porosity

Inactive Publication Date: 2017-03-22
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adding a silane coupling agent to improve the coating degree of graphene, to overcome the shortcomings of conventional coating incomplete, fully cover the silica particles, can be widely used in the field of hydrophobic or thermal conductive coating

Method used

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  • Preparation method of graphene-coated silicon dioxide nanoparticles
  • Preparation method of graphene-coated silicon dioxide nanoparticles
  • Preparation method of graphene-coated silicon dioxide nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of graphene oxide: Graphene oxide was prepared by the modified Hummers method using commercially available graphite powder as raw material. NaNO 3 Add it into concentrated sulfuric acid, add graphite powder and potassium permanganate after complete dissolution, and obtain a bright yellow system after further reaction, obtain graphite oxide after filtering and drying; then pass through a tube furnace to prepare graphene oxide powder through thermal expansion.

[0028] (2) SiO 2 Preparation of nanospheres: Add 0.5 g of cetyltrimethylammonium bromide to 60 ml of absolute ethanol, stir for 30 min, then slowly add 3.0 ml of tetraethyl orthosilicate, 1.0 ml of ammonia water and 10 ml of Ionized water, stirred for 4 hours, washed three times with ethanol and deionized water, and placed at 70 o C drying oven, and then placed in the muffle furnace 550 o C sintered for 3 hours to obtain SiO 2 microsphere powder.

[0029] (3) Graphene@SiO 2 Preparation of com...

Embodiment 2

[0031] (1) The preparation method of graphene oxide is the same as step (1) in Example 1;

[0032] (2) SiO 2 The preparation method of nano-microspheres is the same as step (2) in Example 1;

[0033] (3) Graphene@SiO 2 Preparation of composite materials: the implementation method is the same as step (3) in Example 1, the difference from Example 1 is that the added silane coupling agent is different, and the silane coupling agent used in this example is 3-aminopropylmethyl Dimethoxysilane (KH-662), still obtain graphene-coated complete SiO 2 composite material. image 3 SiO coated with graphene 2 SEM image of the composite, graphene coated on SiO 2 The surface of the nano-microspheres, the degree of coating is still good.

Embodiment 3

[0035] (1) The preparation method of graphene oxide is the same as step (1) in Example 1;

[0036] (2) SiO 2 The preparation method of nano-microspheres is the same as step (2) in Example 1;

[0037] (3) Graphene@SiO 2 Preparation of composite material: the implementation method is the same as step (3) in Example 1, the difference from Example 1 is that the pH value when graphene oxide coating is different, this example uses the pH value control when graphene oxide coating is 3, and graphene-coated complete SiO can still be obtained 2 composite material. This shows that under acidic conditions, graphene can still be coated on SiO 2 The surface of the nano-microsphere has a good coating degree.

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Abstract

The invention discloses a preparation method of graphene-coated silicon dioxide nanoparticles. Graphite powder is taken as a raw material, graphene oxide with oxygen-containing functional groups is prepared with an improved Hummers method, the silicon dioxide nanoparticles are prepared with a hydrothermal method, a proper quantity of silane coupling agents are added to a solution containing silicon dioxide and uniformly stirred, the silane coupling agents are attached to the surfaces of silicon dioxide particles, and surface-modified silicon dioxide particles are obtained; graphene oxide is added to the modified silicon dioxide solution, and surfaces of the silicon dioxide particles are completely coated with graphene oxide under the interaction of functional groups. Finally, a reducing agent is added to the solution, graphene is formed by further removing the oxygen-containing functional groups of graphene oxide, and a composite with graphene completely coating silicon dioxide is prepared. The method has the advantages that a process is simple, the reaction time is short, regulation is easy and the like. The prepared composite has the characteristics of regular structure, high porosity, low density, good hydrophobicity and the like.

Description

technical field [0001] The invention belongs to the field of composite material preparation, and in particular relates to a preparation method of graphene-coated silicon dioxide nano-microsphere particles. Background technique [0002] Graphene is a carbon atom with sp 2 The hybridized orbitals form a hexagonal planar film with a honeycomb lattice, a two-dimensional material with a thickness of only one carbon atom. Graphene has many excellent structures and properties, such as ultra-high specific surface area (2600 m 2 / g), large electron mobility 2×10 5 m 2 / (V·s), etc., and its resistivity is only 10 6 Ω·cm, so it has broad application prospects in the fields of coatings and energy materials. At the same time, graphene can be used as a performance-enhanced substrate material and compound to be coated and modified to form a composite material with excellent performance. [0003] Silicon dioxide (SiO 2 ) is a hotspot in material research at present. It has a low de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
CPCC01B33/12C01P2004/03
Inventor 何丹农王敬锋林琳金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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