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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 graphene pressure sensors, and this method is very difficult to prepare single-layer graphene films

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

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preparation example Construction

[0029] The invention provides a method for preparing a graphene composite material with high sensitivity to detect pressure changes, the process flow diagram of the preparation method is as follows figure 1 Shown, the component of the graphene oxide suspension used in this preparation method is as follows table 1:

[0030] Table 1 graphene oxide suspension component list

[0031]

[0032] Aqueous polymer solution:

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

[0034] ②10wt% gelatin aqueous solution

[0035] ③10wt% polyvinyl alcohol (PVA) aqueous solution.

Embodiment 1

[0037] Step 1: first prepare graphene oxide from graphene by the Hummer method. The specific method is to add 15g of potassium permanganate powder and 5g of graphene powder in 150ml of concentrated sulfuric acid and stir in an ice-water bath (temperature is lower than 20°C). After 2h oxidation reaction, obtain brown graphene flakes with derivatized carboxylic acid groups on the edge and mainly phenolic hydroxyl groups and epoxy groups on the plane;

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

[0039] Step 3: Perform one-way rapid freezing of the graphene oxide suspension after adding ethanol in a one-way liquid nitrogen freezing device, and put it into a freeze dryer for drying after ...

Embodiment 2

[0047] Step 1: first prepare graphene oxide from graphene by the Hummer method. The specific method is to add 15g of potassium permanganate powder and 5g of graphene powder in 150ml of concentrated sulfuric acid and stir in an ice-water bath (temperature is lower than 20°C). After 2h oxidation reaction, obtain brown graphene flakes with derivatized carboxylic acid groups on the edge and mainly phenolic hydroxyl groups and epoxy groups on the plane;

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

[0049] Step 3: Perform one-way rapid freezing of the graphene oxide suspension after adding ethanol in a one-way liquid nitrogen freezing device, and put it into a freeze dryer for drying after ...

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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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