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A kind of preparation method of hydrophilic three-dimensional graphene sponge

A graphene sponge and hydrophilic technology, applied in the field of wearable and artificial intelligence, can solve safety hazards, dangers and other problems, and achieve the effect of excellent piezoresistive characteristics

Active Publication Date: 2022-02-11
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, all methods for preparing three-dimensional graphene sponges use graphene oxide as a precursor, and finally reduce it to graphene. Various reduction methods are dangerous to operate in the laboratory and are prone to safety hazards.

Method used

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  • A kind of preparation method of hydrophilic three-dimensional graphene sponge
  • A kind of preparation method of hydrophilic three-dimensional graphene sponge
  • A kind of preparation method of hydrophilic three-dimensional graphene sponge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take a 10 mg / ml water-soluble graphene dispersion with a rubber dropper and gradually drop it into liquid nitrogen (-196 °C). After the dispersion is condensed into ice, put it into a freeze dryer for vacuum drying. 24 hours to process. figure 1 Its scanning electron microscope picture can clearly observe the porous and loose structure. This porous structure endows it with ultra-low density and piezoresistive properties. figure 2 Optical images of 3D graphene sponges of different sizes and densities.

Embodiment 2

[0018] Take 10 mg / ml water-soluble graphene dispersion in a beaker, place it in a constant temperature cold trap (-20 ℃), and put it into a freeze dryer after the dispersion condenses into ice. Vacuum drying can be done for 48 hours. image 3 In its scanning electron microscope picture, an ordered porous and loose structure can be clearly observed. Figure 4 Optical image of the 3D graphene sponge.

Embodiment 3

[0020] The preparation method is the same as in Example 1, and the difference is: the concentration of the water-soluble graphene dispersion is 5 mg / ml, and the scanning electron microscope picture of the prepared three-dimensional graphene sponge is similar to figure 1 .

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Abstract

The invention discloses a preparation method of a hydrophilic three-dimensional graphene sponge. First, water-soluble graphene is selected as a precursor material and dissolved in deionized water to make a dispersion liquid, and then the dispersion liquid is placed in a low-temperature environment to condense and form it. It is freeze-dried to obtain a three-dimensional graphene sponge with superhydrophilicity. The three-dimensional graphene sponge has a porous and loose structure, low density and piezoresistive effect, and can be made into an ultrasensitive sensor. At the same time, this preparation process omits the reduction process of graphene oxide, and does not need to use dangerous and toxic reduction methods such as reaction kettle, hydrazine hydrate, hydrogen iodide, etc., which improves the safety index of the laboratory and simplifies the experimental process. Therefore, it has great application value in the fields of wearable and artificial intelligence.

Description

technical field [0001] The invention relates to the technical fields of wearable and artificial intelligence, in particular to a method for preparing a hydrophilic three-dimensional graphene sponge. Background technique [0002] With the rapid development of smart terminals, wearable electronic devices have received extensive attention in the fields of life entertainment, sports health care and biomedicine. As a device that converts physical stimulation signals into electrical signals, flexible sensors are an essential part of flexible wearable devices. With the increasing demand for functional sensitivity and stability of sensors, researchers need to select flexible sensing materials with better performance and further study to improve the processing technology of flexible sensors. [0003] The excellent electrical conductivity and the piezoresistive properties of the three-dimensional graphene sponge make it a promising sensing material. However, at present, all methods ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/194
CPCC01B32/194C01B2204/20
Inventor 吴幸骆泽纬张嘉言
Owner EAST CHINA NORMAL UNIV
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