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Preparation method and application of a flexible strain sensor based on conductive fibers

A strain sensor and conductive fiber technology, which is applied in fiber processing, catheters, textiles and papermaking, etc., can solve the problems that the thickness of the conductive coating cannot be accurately controlled, affects the long-term performance of the device, and the conductive particles on the surface of the fiber are easy to fall off. Real-time monitoring of human movement, increasing the detectable range, and promoting the effect of deposition and adsorption

Active Publication Date: 2020-08-18
GENERAL HOSPITAL OF PLA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the thickness of the conductive coating cannot be precisely controlled, and the conductive particles on the fiber surface are easy to fall off due to friction and other effects, thus affecting the long-term performance of the device.

Method used

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  • Preparation method and application of a flexible strain sensor based on conductive fibers
  • Preparation method and application of a flexible strain sensor based on conductive fibers
  • Preparation method and application of a flexible strain sensor based on conductive fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] a. Cleaning of elastic yarn: the internal structure and surface morphology of elastic yarn are as follows: figure 1 As shown in (a), a section of 5 cm long elastic yarn was cut, ultrasonically cleaned in ethanol and deionized water for 20 minutes, and then placed in an oven at 60°C until completely dried.

[0036] b. Preparation of poly(vinylidene fluoride-trifluoroethylene) nanofibers: First, 1 gram of poly(vinylidene fluoride-trifluoroethylene) was dissolved in a mixed solution of 2 grams of N-N dimethylformamide and 2 grams of acetone , and stirred at room temperature for 2 hours until the precursor solution was homogeneous and transparent. Then, take 1 ml of precursor solution into a 5 ml disposable plastic needle to start electrospinning. Spinning parameters are: voltage 10 kV, receiving distance 10 cm.

[0037] c. Coating of nanofiber membrane: place the elastic yarn pre-stretched to 2 times the length on the collecting plate, and slowly rotate along the axial d...

Embodiment 2

[0040] Repeat Example 1, with the following differences: after the ethanol is completely volatilized in the d process, repeat the d process again according to the silver nanowire dispersion of the same concentration and the amount added, so a total of 3 times, the elastic yarn can be removed and recovered To the original length, complete the preparation process.

Embodiment 3

[0042] Repeat Example 1, with the following difference: after the ethanol is completely volatilized in the d process, repeat the d process again according to the silver nanowire dispersion of the same concentration and the amount of addition, so a total of 5 times, you can take off the elastic yarn and recover To the original length, complete the preparation process.

[0043] Embodiment 1-3 result: as figure 2 As shown, the structure of each layer can be clearly distinguished from the cross-sectional topography of the conductive fiber prepared in Example 3. image 3 Silver nanowires adsorbed on the surface of the conductive fibers and the wrinkled structure formed on the surface of the electrospun nanofibrous membrane after restoring the pre-stretching deformation. Depend on Figure 4 It can be seen that with the increase of the number of silver nanowire dispersion drops, more and more silver nanowires are deposited and adsorbed on the surface of the electrospun fiber membr...

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Abstract

The invention provides a preparation method of a flexible strain sensor based on conductive fiber and application thereof. The conductive fiber comprises a metal nanowire as a conductive layer, an electrospun polymer nanofiber membrane as a protective layer and an elastic yarn as an elastic carrier. In the preparation process, the surface of the elastic yarn is coated with a layer of polymer nanofiber membrane by an electrospinning technology first and then the metal nanowire is deposited on the surface structure thereof through multiple dip coating. The prepared flexible strain sensor based on the conductive fiber has the ability of quickly detecting various deformations such as stretching, bending and twisting, and the sensitivity thereof is still maintained to be 90% or above after thenumber of stretching cycles reaches 10,000; the flexible strain sensor can achieve simultaneous detection of human pulse beat, vocal cord vibration and more complex multiple sites, and has a great application potential in smart wearable devices such as virtual reality, human-machine interfaces and health monitoring.

Description

Technical field: [0001] The invention belongs to the technical field of preparation of flexible electronic devices, and in particular relates to a preparation method and application of a conductive fiber based on a metal nanowire and an electrospun polymer nanofiber film and a flexible stretchable strain sensor. Background technique: [0002] With the development of science and technology, traditional electronic devices will be difficult to meet the various needs of human beings, and they will inevitably develop in the direction of flexibility, miniaturization, wearable, etc., so as to break through the application range of traditional electronic devices and promote the organic integration of information and people. combined. Among them, the strain sensor, as a sensor for monitoring deformation such as stretching, bending, and twisting, has a broad application space in the fields of electronic skin, flexible display, health monitoring, and human-machine interface. At presen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/83D06M15/256A61B5/02
CPCA61B5/02D06M11/83D06M15/256
Inventor 姜凯陈照军沈国震姜源杜辉曹玉杰鲁鸽
Owner GENERAL HOSPITAL OF PLA
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