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Graphene oxide microsphere and graphene microsphere and preparation methods thereof

A graphene and graphene sheet technology, applied in the field of nanomaterials or inorganic functional materials, materials science, can solve the problems of easy overlapping, inability to have a high specific surface area of ​​graphene, application limitations, etc., and achieve easy availability of raw materials and production costs. Low, easy to control effect

Inactive Publication Date: 2013-05-29
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, people's research on graphene is mainly focused on the self-assembly of two-dimensional materials. A significant defect of this structure is that there is a strong interaction force between graphene sheets, so it is easy to overlap each other, which cannot make graphene more High specific surface area, exerting the superior characteristics of nanosheets, the application in some fields is limited

Method used

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  • Graphene oxide microsphere and graphene microsphere and preparation methods thereof
  • Graphene oxide microsphere and graphene microsphere and preparation methods thereof
  • Graphene oxide microsphere and graphene microsphere and preparation methods thereof

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preparation example Construction

[0041] Further, in order to obtain graphene microspheres, the aforementioned preparation method may further comprise the following steps:

[0042] (3) Reduction: hydrazine hydrate reduces graphene oxide microspheres to obtain graphene microspheres.

[0043] The voltage of the applied electric field in the aforementioned step (1) can be 0-30 KV to form an electrostatic field. The graphene oxide suspension droplet is kept in a crescent shape by its own surface tension at the outlet of the needle nozzle. When a high voltage is applied, under the induction of the electric field force, a large amount of charge is accumulated inside the graphene oxide suspension, and the droplet is subjected to a Electric field force in opposite direction of surface tension. As the electric field strength gradually increases, the droplet at the nozzle elongates from a spherical shape to a cone shape, which is called a Taylor cone. When the electric field strength continues to increase and the elec...

Embodiment 1

[0062] The 12.5 mg / ml graphene oxide suspension was electrosprayed and received by stirring with 0.35 mg / ml CTAB aqueous solution. Electrostatic spraying—wet collection devices such as figure 1 As shown, it includes propulsion device, static electricity generating device and receiving device. Inhale a certain amount of graphene oxide suspension into a 2 ml plastic syringe with a needle tip inner diameter of 0.50 mm. Connect the positive pole of the high-voltage power supply to the needle tip, and the coagulation liquid of the receiving device is grounded. A stable jet flow was formed under the conditions of a bolus injection speed of 0.05 mm / min and an applied voltage of 9 KV. When the stirring speed was 2 and the CTAB concentration was 0.35 mg / ml, the graphene oxide microspheres were received, and the graphene oxide hollow microspheres were obtained. The spheres were observed through a high-power optical microscope and a scanning electron microscope.

[0063] figure 2 It...

Embodiment 2

[0065] The 12.5 mg / ml graphene oxide suspension was electrosprayed and received by stirring with 0.55 mg / ml CTAB aqueous solution. Inhale a certain amount of graphene oxide suspension into a 2 ml plastic syringe with a needle tip inner diameter of 0.50 mm. Connect the positive pole of the high-voltage power supply to the needle tip, and the coagulation liquid of the receiving device is grounded. A stable jet flow was formed under the conditions of a bolus injection speed of 0.05 mm / min and an applied voltage of 9 KV. When the stirring speed was 2 and the CTAB concentration was 0.55 mg / ml, the graphene oxide microspheres were received, and the graphene oxide hollow microspheres were obtained. The sphere, partly graphene oxide erythrocyte-like structure, was observed with a high-power optical microscope and a scanning electron microscope.

[0066] Figure 4 It is an optical microscope photo of the above-mentioned graphene oxide microspheres. It can be seen from the figure that...

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Abstract

The invention discloses a graphene oxide microsphere and a graphene microsphere and preparation methods thereof. The graphene oxide microsphere and the graphene microsphere respectively comprise a three-dimensional porous structure mainly formed by assembling graphene oxide slices or reduced graphene oxide slices, wherein the three-dimensional porous structure comprises a simulated erythrocyte structure. The preparation method of the graphene oxide microsphere comprises the following steps: (1) electrostatic spraying: carrying out electrostatic spraying treatment on a precursor solution, so that a microsphere-shaped liquid drop is formed; and (2) wet collection: injecting a solidification liquid into the microsphere-shaped liquid drop, so that the graphene oxide microsphere is prepared. The preparation method of the graphene microsphere comprises the following step: preparing the graphene oxide microsphere into the graphene microsphere by utilizing a chemical reduction method. The preparation methods are simple to operate and convenient to regulate and control. The prepared graphene microsphere is high in purity, and the raw materials are obtained easily, so that the production cost is low and the production efficiency is high. Therefore, the graphene microsphere can be prepared in batches.

Description

technical field [0001] The invention relates to a novel graphene material and a preparation process thereof, in particular to a graphene oxide microsphere, a graphene microsphere and a preparation method thereof, belonging to the field of material science, especially the field of nanomaterials or inorganic functional materials. Background technique [0002] In 2004, the Geim research group of the University of Manchester successfully prepared single-layer graphene by microcomputer exfoliation method (Science, 2004, 306, 666-669). The research showed that graphene is composed of two-dimensional honeycomb lattice It consists of a flat single-layer carbon atom that is closely packed, and each of its carbon atoms is connected to three adjacent carbon atoms through a σ bond to form sp 2 Hybrid structure; at the same time, each carbon atom has an unbonded π-electron, and the remaining π-electron can move freely in the crystal. The theoretical thickness of graphene is only 0.34 nm...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/19C01B32/198
Inventor 陈韦田亚洋周莉莎
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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