A preparation method for controlling the morphology of graphene oxide nanostructures

A nanostructure and graphene technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., to achieve the effect of low cost, controllable performance and high yield

Inactive Publication Date: 2016-05-18
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • A preparation method for controlling the morphology of graphene oxide nanostructures
  • A preparation method for controlling the morphology of graphene oxide nanostructures
  • A preparation method for controlling the morphology of graphene oxide nanostructures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Three-dimensional net-like GO nanostructure: Graphite oxide powder was prepared from graphite powder purchased on the market using the improved Hummer method; 30.2 mg of graphite oxide powder was added to deionized water, and ultrasonically dispersed to obtain a concentration of 1.0 mg / mL under the action of continuous ultrasound, add 20mg polyvinyl alcohol, and stir the mixed solution with ultrasonic and magnetic force for 1 hour respectively; 12h; After the reaction, it was naturally cooled to room temperature, and the product was repeatedly centrifuged and washed, and finally dried in a freeze dryer for 20h.

[0030] figure 1 a-b are representative SEM images of the product obtained in Example 1. It can be seen that the product has an obvious three-dimensional network structure, which is formed by the interweaving of very thin nanosheets in three-dimensional space, forming many holes. Since polyvinyl alcohol can infiltrate the pores of the three-dimensional network...

Embodiment 2

[0032] Reaction temperature is 120 ℃, and other conditions are with example 1.

[0033] The product of Example 2 is an aggregate with irregular shape and large size. This is due to the fact that at lower temperatures, the attractive force generated by the π-π interaction is much greater than the repulsive force of the random arrangement, leading to the formation of products composed of graphene oxide nanosheets that are tightly packed. This indicates that the three-dimensional network nanostructure of graphene oxide cannot be obtained when the temperature is lower than 120 °C.

Embodiment 3

[0035] Ni 2+ When the molar ratio (r) to graphite oxide powder was 0.025, the reaction temperature was 120° C., and other conditions were the same as in Example 1.

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Abstract

The invention discloses a preparation method for controlling graphene oxide nanostructure morphology. The method comprises the following steps: carrying out ultrasonic dispersion of graphite oxide powder in deionized water to obtain a suspension with the concentration of 0.5-2.0mg / mL; adding 10-30mg of polyvinyl alcohol and NiCl2, and respectively carrying out ultrasonic treatment and magnetic stirring for 1h; reacting at a constant temperature of 120-200DEG C; and washing the above obtained product, and freeze-drying for above 5h. The method controls the self-assembling of graphene oxide nanosheets by introducing different amount of Ni<2+> and changing the temperature, and the main morphologies of the product comprise a single layer structure, a multilayer structure and a tridimensional network structure. The method overcomes the problem that the self-assembling of two-dimensional sheet-shaped nanomaterials, and a super capacitance material with a high capacitance value and stable charge and discharge performances is obtained. Compared with routine methods, the method has the advantages of simple device, easy operation, high yield and good controllability, and is of great significance for the self-assembling of the nanomaterials, performance optimization and mechanization.

Description

technical field [0001] The invention relates to a preparation method for controlling the morphology of graphene oxide nanostructures, in particular, a preparation method for graphene oxide nanostructures with different shapes for energy storage materials. By hydrothermal method, by introducing Ni into the reaction solution 2+ ions and adjust the Ni 2+ Concentration and reaction temperature realize the shape control of the nanostructure, and the shape mainly includes single-layer, multi-layer and three-dimensional network. Background technique [0002] Graphene is composed of a single-layer honeycomb hexagonal sp 2 Single-atom-thick two-dimensional materials composed of hybrid carbon atoms have excellent electrical, thermal conductivity and mechanical properties. As a branch of graphene, graphene oxide (GO for short) materials are usually prepared by oxidizing natural graphite oxide powder with a strong oxidant. The abundant covalent oxygen-containing functional groups and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04B82Y30/00B82Y40/00
Inventor 唐少春孟祥康李楠庭王勇光王翔宇
Owner NANJING UNIV
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