Flexible pressure sensor containing CNT composite organic material and preparation method of flexible pressure sensor

A technology of pressure sensors and organic materials, applied in the field of flexible pressure sensors containing CNT composite organic materials and its preparation, can solve the problems of unsuitable hot press pressure detection, unsatisfactory, small range, etc., and achieve the maximum utilization efficiency of industrial resources Minimization, cost reduction, physical volume, and low working condition requirements

Pending Publication Date: 2022-02-25
建木柔电(深圳)智能设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the ordinary pressure sensor can work at high temperature and the range meets the requirements, it is limited by the fixed physical shape and cannot be used for the pressure detection of the hot press
[0007] Due to the fixed physical shape, the traditional pressure sensor mainly uses the combination of metal shell and thin film, the application field is very limited, and it cannot solve the problem of pressure sensor on various curved surfaces and narrow spaces
In terms of sensing range, other types of flexible thin-film pressure sensors in the market are often limited by the principle of sensing materials used, and the range is often small, which cannot meet the needs of the industry for high pressure exceeding 10MPa.

Method used

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  • Flexible pressure sensor containing CNT composite organic material and preparation method of flexible pressure sensor

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Experimental program
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Effect test

Embodiment 1

[0043] The flexible pressure sensor containing CNT composite organic material is composed of 5 layers, that is, the upper part is composed of polyimide flexible substrate and high-precision silver electrode fixed on the substrate, and the active sensing layer, high-precision silver electrode and polyimide The lower half consists of an imide flexible substrate. The electrodes of the upper part and the lower part are in a cross pattern. The polyimide base film has excellent stability, insulation and mechanical properties, and its temperature resistance is relatively good, it can adapt to a wide range of temperature changes, and it also has good corrosion resistance. The active sensing layer includes multi-walled carbon nanotubes and polymethyl methacrylate.

[0044] The specific preparation process is as follows: first, laser cut the polyimide flexible substrate into a rectangle of 30×18 cm. Spread the cut polyimide substrate on the workbench, then install the screen printing ...

Embodiment 2

[0048] The flexible pressure sensor comprising CNT composite organic material of the present invention is composed of 5 layers, that is, the upper part is composed of a PDMS flexible substrate and a high-precision silver electrode fixed on the substrate, and an active sensing layer, a high-precision silver electrode and a PDMS The lower part consists of a flexible substrate. The electrodes of the upper part and the lower part are in a cross mode. The advantages of PDMS film are: low Young's modulus, good flexibility and stretchability, strong corrosion resistance, good transparency and stability in a wide range of operating temperatures, and can be used for large-area transparent The substrate material of flexible electronic devices or thermally stable devices; it is easy to combine with electronic materials, so that electronic materials can be fixed on its surface, and PDMS can be prepared into a structure with a certain geometric shape according to needs to improve its ducti...

Embodiment 3

[0053] The preparation process of the active sensing layer slurry is as follows: Polymethyl methacrylate PMMA (5wt%) having a high molecular weight can be dissolved in diethylene glycol butyl ether acetate relatively quickly under 100° C. heating magnetic stirring; Diethylene glycol butyl ether acetate is used as an ink solvent in printing processes because of its low volatility and high boiling point. Use a homogenizer for high-speed stirring to disperse the multi-walled carbon nanotubes in butyl acetate to form a butyl acetate-based multi-walled carbon nanotube solution. The detailed process of the high-speed stirring of the homogenizer is 1000r / min to stir and mix the slurry for 15 minutes , wait for the slurry to cool down, and then stir in vacuum at a speed of 300r / min for 3 minutes. A 10% butyl acetate-based multi-walled carbon nanotube (MWCNT) solution was then added to the PMMA solution. The dispersion of carbon nanotubes in resins has always been a challenge in the s...

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Abstract

The invention discloses a flexible pressure sensor containing a CNT composite organic material, and relates to the field of flexible film sensors. The flexible pressure sensor comprises a first flexible substrate, a first electrode, an active sensing layer, a second electrode and a second flexible substrate from top to bottom, wherein the active sensing layer is located between the first flexible substrate and the second flexible substrate, the first electrode and the second electrode are respectively fixed on the first flexible substrate and the second flexible substrate, and the first electrode and the second electrode are in a cross mode; and the active sensing layer is made of multi-walled carbon nanotubes (CNT) and polymethyl methacrylate, and the active sensing layer is manufactured in an additive manufacturing mode. The invention also discloses a preparation method of the flexible pressure sensor. According to the invention, the high-temperature-resistant and high-pressure-resistant organic composite material is used for the active sensing layer, so that the preparation process and the printing process of the slurry are optimized, and the requirements on high-temperature-resistant, wide-range and high-precision pressure sensing in industry and consumer electronics are met.

Description

technical field [0001] The invention relates to the field of flexible film sensors, in particular to a flexible pressure sensor containing CNT composite organic material and a preparation method thereof. Background technique [0002] Sensors convert physical or environmental stimuli into detectable signals and play an important role in the process of modern industrial automation and intelligence. Among them, the flexible pressure sensor has the advantages of portability, flexibility, light weight, and thin thickness, and can be applied to different application scenarios. It is widely used in the fields of electronic skin, artificial intelligence, soft robotics, and health monitoring. one of the hot issues. [0003] As a one-dimensional carbon material, CNT has good electrical and mechanical properties. CNT has good deformation-induced resistance change characteristics, and its own gauge coefficient is very high. The self-gage coefficient of pure CNT can be as high as 1000 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/18
CPCG01L1/18
Inventor 左佳林黄雨润黄珂儿范超袁帅
Owner 建木柔电(深圳)智能设备有限公司
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