Preparation method of graphene composite material for detecting pressure change with high sensitivity

A sensitive detection and composite material technology, which is applied in the field of graphene composite material preparation, can solve the difficulty of single-layer graphene film and achieve the effect of improving hardness and related performance

Pending Publication Date: 2022-05-10
CHINA SOUTH POWER GRID ELECTRIC POWER RES INST
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  • Application Information

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Problems solved by technology

[0004] The most common Hummers method is used to prepare graphene oxide in the preparation of gr

Method used

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  • Preparation method of graphene composite material for detecting pressure change with high sensitivity
  • Preparation method of graphene composite material for detecting pressure change with high sensitivity
  • Preparation method of graphene composite material for detecting pressure change with high sensitivity

Examples

Experimental program
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Example Embodiment

[0029] The invention provides a preparation method of a graphene composite material for highly sensitive detection of pressure changes, and the process flow diagram of the preparation method is as follows: figure 1 As shown, the components of the graphene oxide suspension used in the preparation method are as follows in Table 1:

[0030] Table 1 Graphene oxide suspension composition table

[0031]

[0032] Aqueous polymer solution:

[0033] ①10wt% solution of polyetherimide / dichloromethane (the mass ratio of PEI / DCM is 1:10)

[0034] ②10wt% gelatin aqueous solution

[0035] ③ 10wt% polyvinyl alcohol (PVA) aqueous solution.

Example Embodiment

[0036] Example 1:

[0037] Step 1: First, graphene oxide is prepared by Hummer method. The specific method is to add 15g potassium permanganate powder and 5g graphene powder in 150ml concentrated sulfuric acid in an ice-water bath (temperature lower than 20°C) and stir, After 2h oxidation reaction, a brown graphene sheet with derived carboxylic acid groups at the edges and mainly phenolic hydroxyl groups and epoxy groups on the plane was obtained;

[0038] Step 2: Mix graphene oxide, Tris-HCl, PVA and deionized water and perform magnetic stirring to prepare graphene oxide with a volume fraction of 30%, Tris-HCl with a volume fraction of 1%, and a volume fraction of 1% Graphene oxide suspension of PVA and deionized water with a volume fraction of 68%, and then add ethanol to stir;

[0039] Step 3: One-way quick freezing is performed on the graphene oxide suspension after adding ethanol in a one-way liquid nitrogen freezing device, and after all freezing is completed, it is put...

Example Embodiment

[0046] Example 2:

[0047] Step 1: First, graphene oxide is prepared by Hummer method. The specific method is to add 15g potassium permanganate powder and 5g graphene powder in 150ml concentrated sulfuric acid in an ice-water bath (temperature lower than 20°C) and stir, After 2h oxidation reaction, a brown graphene sheet with derived carboxylic acid groups at the edges and mainly phenolic hydroxyl groups and epoxy groups on the plane was obtained;

[0048] Step 2: Mix graphene oxide, Tris-HCl, PVA and deionized water and perform magnetic stirring to prepare graphene oxide with a volume fraction of 30%, Tris-HCl with a volume fraction of 1%, and a volume fraction of 1% Graphene oxide suspension of PVA and deionized water with a volume fraction of 68%, and then add ethanol to stir;

[0049] Step 3: One-way quick freezing is performed on the graphene oxide suspension after adding ethanol in a one-way liquid nitrogen freezing device, and after all freezing is completed, it is put...

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Abstract

The invention provides a preparation method of a graphene composite material for high-sensitivity detection of pressure change. When the prepared graphene composite material is applied to a pressure sensor, tiny pressure changes can be sensed under many severe conditions, and related conditions can be monitored in real time.

Description

technical field [0001] The invention relates to a preparation method of a graphene composite material capable of detecting pressure changes with high sensitivity. Background technique [0002] With the continuous development of science and technology, all kinds of pressure sensors are constantly being developed and improved, but some of them cannot be widely used due to reasons such as cost, preparation process, and sensitivity. Therefore, how to prepare low-cost, simple and high-sensitivity pressure sensors is a The current focus of public attention. [0003] In recent years, graphene, as a new type of material, will be widely used in electronics, medicine, and energy storage, and its application in micro-pressure sensors is also in great demand. During the measurement process of the micro-pressure sensor, the pressure directly acts on the diaphragm of the sensor, causing the diaphragm to produce a micro-displacement proportional to the medium pressure, causing the resista...

Claims

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Application Information

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IPC IPC(8): C01B32/194G01L1/20
CPCC01B32/194G01L1/20
Inventor 张福增王婷婷罗兵曾向君廖一帆
Owner CHINA SOUTH POWER GRID ELECTRIC POWER RES INST
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