Preparation methods for composite nanofiber membrane and flexible strain sensor

A composite nanofiber and strain sensor technology, applied in the direction of fiber type, fiber treatment, fiber chemical characteristics, etc., can solve the problems of sensing mechanism failure, weak binding force, and reduced sensitivity, and achieve extended strain sensing range, good pull Good elongation and uniformity

Active Publication Date: 2021-06-04
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, flexible strain sensors prepared in this way usually cannot combine high sensitivity and large detection range
In order to improve the detection range, it is often necessary to increase the amount of conductive nanomaterials, which will lead to a decrease in sensitivity and bring about cost problems
How to prepare flexible sensors with large sensing range and high sensitivity while reducing the amount of expensive conductive nanomaterials is still a big challenge
At the same time, the bonding force between solid conductive nanomaterials and elastic substrates is usually weak, and the conductive network is prone to breakage during the stretching process, which makes the sensing mechanism invalid, resulting in a small sensing range of the flexible strain sensor.
Therefore, while reducing the amount of expensive conductive nanomaterials and ensuring the sensitivity of the sensor, it is still a big challenge to prepare a flexible strain sensor with a large sensing range.

Method used

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  • Preparation methods for composite nanofiber membrane and flexible strain sensor
  • Preparation methods for composite nanofiber membrane and flexible strain sensor
  • Preparation methods for composite nanofiber membrane and flexible strain sensor

Examples

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preparation example Construction

[0039] refer to figure 1 , a method for preparing a composite nanofibrous membrane for a flexible strain sensor, comprising the steps of:

[0040] S1. Use a precision balance to measure polymer materials with good tensile strength such as polyurethane particles, polydimethylsiloxane (PDMS) or polyoxymethylene (POM) with a mass fraction of 25% to 30% and add them to the pre-configured In the solvent, use a magnetic stirrer to stir until the polyurethane particles are completely dissolved to obtain a spinning solution;

[0041] S2. Transfer the spinning solution obtained in S1 to the syringe in the electrospinning equipment, extrude the spinning solution through the syringe, adjust the parameters related to electrospinning, so that the extruded spinning solution drops in the high-voltage electrostatic field Under the action, a stable jet is formed, and the jet is stretched at high speed by electric field force, solvent volatilization and solidification, and finally deposited on...

Embodiment 1

[0052] A preparation method for a composite nanofiber membrane for a flexible strain sensor, comprising the following steps:

[0053] A. Use a precision balance to measure polyurethane particles with a mass fraction of 25% and add them to the pre-configured organic solvent. The organic solvent is composed of N,N-dimethylformamide (DMF) solution and acetone solution, wherein N,N- The mass fraction of dimethylformamide (DMF) solution is 75%. Use a magnetic stirrer to stir until the polyurethane particles are completely dissolved to obtain a spinning solution;

[0054] B. Transfer the spinning solution to the syringe, extrude the spinning solution through the syringe, adjust the parameters related to electrospinning, wherein the advancing speed is 6 μL / min, the spinning voltage is 8.65kV, and the receiving distance is 10cm to make the extruded The droplets form a stable jet under the action of a high-voltage electrostatic field, and the jet is stretched at a high speed by the el...

Embodiment 2

[0058] A preparation method for a composite nanofiber membrane for a flexible strain sensor, comprising the following steps:

[0059] A. Use a precision balance to measure polyurethane particles with a mass fraction of 30% and add them to the pre-configured organic solvent. The organic solvent is composed of N,N-dimethylformamide (DMF) solution and acetone solution, wherein N,N- The mass fraction of dimethylformamide (DMF) solution is 60%. Use a magnetic stirrer to stir until the polyurethane particles are completely dissolved to obtain a spinning solution;

[0060] B. Transfer the spinning solution to the syringe, extrude the spinning solution through the syringe, and adjust the parameters related to electrospinning, wherein the advancing speed is 8 μL / min, the spinning voltage is 10 kV, and the receiving distance is 12 cm to make the extruded liquid The droplets form a stable jet under the action of a high-voltage electrostatic field. The jet is stretched at a high speed by...

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Abstract

The invention discloses preparation methods for a composite nanofiber membrane and a flexible strain sensor. The preparation method for the composite nanofiber membrane comprises the following steps of firstly dissolving polymer particles in an organic solvent to prepare a spinning solution; transferring the spinning solution into an injector, extruding the spinning solution through the injector, and adjusting relevant parameters of electrostatic spinning to enable jet flow to be stable so as to collect a nanofiber membrane on a collecting plate; after silver nanowire dispersion liquid is diluted and subjected to water bath ultrasonic dispersion, depositing a metal nanowire layer on the pre-stretched nanofiber membrane through a vacuum-assisted suction filtration method; and increasing the binding force between nanowires and the binding force between the nanowires and an elastic substrate through high-temperature annealing. The prepared flexible strain sensor has a large sensing range and can be used for detecting deformation such as bending, stretching and twisting.

Description

technical field [0001] The invention belongs to the technical field of flexible strain sensors, and in particular relates to a preparation method of a composite nanofiber membrane and a flexible strain sensor. Background technique [0002] Strain sensor is a kind of important sensor device. When the sensor device is subjected to external force, it will deform itself, resulting in a change in the resistance or capacitance of the device. By detecting changes in these physical quantities, the function of strain detection is realized. In recent years, flexible and wearable strain sensors have gradually become a research hotspot in the field of strain sensors. This flexible strain sensor has good sensing characteristics such as sensitivity, repeatability and stability, and has become a core device in the fields of electronic skin, wearable electronic devices, and flexible human-computer interaction devices. With the further development of social informatization, various new dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/83D01F6/78D01F6/70D04H1/728D01D5/00G01B7/16D06M101/38
CPCD06M11/83D01F6/78D01F6/70D04H1/728D01D5/003G01B7/18
Inventor 方续东孙昊王云凤吴晨康强蒋庄德前田龙太郎
Owner XI AN JIAOTONG UNIV
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