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Multifunctional conductive yarn, preparation thereof and application of multifunctional conductive yarn to flexible wearable electronic fabrics

A conductive yarn and yarn technology, applied in the directions of yarn, textile and papermaking, fiber processing, etc., can solve the problems of differential strain sensitivity factor, short life of wearable devices, limited sensitivity to fine deformation, etc., to achieve low cost, good quality Cyclic heating performance, the effect of the method is simple and easy to implement

Active Publication Date: 2020-12-25
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, most of the reported conductive yarns exhibit poor strain sensitivity factors (GF), which limit their sensitivity to subtle deformations.
In addition, wearable devices have a short lifespan due to the conductive material in the yarn being prone to oxidation or detachment, which must be overcome to obtain wearable devices with long shelf-life and lifetime.

Method used

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  • Multifunctional conductive yarn, preparation thereof and application of multifunctional conductive yarn to flexible wearable electronic fabrics
  • Multifunctional conductive yarn, preparation thereof and application of multifunctional conductive yarn to flexible wearable electronic fabrics
  • Multifunctional conductive yarn, preparation thereof and application of multifunctional conductive yarn to flexible wearable electronic fabrics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The AgNW stock solution was prepared according to the literature [Chen G, Bi L, Yang Z, et al. Water-based purification of ultrathin silver nanowires toward transparent conductive films with atransmittance higher than 99%. ACS Applied Materials & Interfaces, 2019, 11: 22648-22654.] get. Prepare (A) 220.0 mM NaBr, (B) 210.0 mM NaCl and (C) 505.0 mM PVP K90 in ethylene glycol. Ethylene glycol (116mL), solution A (1mL), solution B (2mL), solution C (15mL) and fresh AgNO 3 (0.6765 g in 15 mL ethylene glycol) was added to a 250 mL flask in an oil bath at room temperature. Then the solution was heated at 300rpm min -1 Stir mechanically for 30 min. After stirring, the temperature of the oil bath was slowly raised to 180C within 20-25min. At the same time, during the heating process, nitrogen (150mL min -1 ) into the solution. When the temperature reached 180°C, the nitrogen was turned off and the temperature of the oil bath was set to 170°C. After 10 min, stirring was s...

Embodiment 2

[0052] Pour 150 mL of the AgNW stock solution prepared in Example 1 into a purification device with a filter membrane (8 μm in pore size) and a six-hole stirring paddle, and dilute to 300 mL with absolute ethanol. The stirring speed of the six-hole stirring paddle was set at 900 rpm. During the cleaning process, slowly drop anhydrous ethanol into the purification device to maintain a constant volume of the solution for a total of 40 minutes of cleaning. After cleaning, perform positive pressure filtration first, then add 36mL PVP solution (0.5wt%, K30, molecular weight 55000), shake evenly and then perform positive pressure filtration again, and collect the purified AgNWs for later use. The SEM image of the purified AgNWs is shown in figure 2 shown.

[0053] The purified AgNW was dispersed in ethanol to prepare a certain concentration of AgNW dispersion.

Embodiment 3

[0055] (1) First, the PET yarn purchased from the market (see image 3 , cut into lengths of 20-24 cm) were ultrasonically cleaned with deionized water and absolute ethanol for 5 min, and dried in air at 60°C. Then, PET yarn is carried out ultraviolet ozone cleaning 10min, obtains the hydrophilic PET yarn with contact angle less than 80 °, the result is as follows Figure 4 shown.

[0056] (2) Stretch the PET yarn treated in step (1) to 220% of its original length and fix it vertically. Get 0.5mL of the silver nanowire dispersion (2mg / mL) obtained in Example 2 and drop it on a The upper section of the PET yarn, let it fall freely along the yarn, coat the yarn, let the silver nanowire dispersion fully wet the yarn, and then dry it completely under hot air immediately. Repeat the same steps for 9 more times to obtain PET yarns (PET / AgNW yarns) containing silver nanowire layers. The photo of PET yarns after AgNW coating shows that the color changes from white to dark green, whi...

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Abstract

The invention discloses a multifunctional conductive yarn, preparation thereof and an application of the multifunctional conductive yarn to flexible wearable electronic fabrics. A preparation method of the conductive yarn comprises the following steps: (1) obtaining a yarn with a contact angle of 80 degrees or below and strain capacity of 10% or above; (2) pre-stretching the yarn in the step (1),wherein the stretching ratio is 1-2.5, coating the pre-stretched yarn with silver nanowire dispersion liquid, performing drying to obtain a yarn containing a silver nanowire layer, and enabling the resistance value of the yarn containing the silver nanowire layer to be 3-7 ohm / cm, wherein the surface of a silver nanowire contains a PVP layer; and (3) pre-stretching the yarn containing the silver nanowire layer, wherein the stretching ratio is 1-1.4, then coating the surface of the yarn with a precursor of a liquid organic elastic polymer, and then performing curing to form an organic elastic polymer layer completely wrapping the yarn on the surface of the yarn so as to obtain the conductive yarn. The conductive yarn provided by the invention has high mechanical strain stability and high strain sensitivity, and can be used in the flexible wearable electronic fabrics.

Description

technical field [0001] The invention relates to a conductive yarn, its preparation method and its application in flexible and wearable electronic fabrics. Background technique [0002] Flexible and stretchable materials are ideal for artificial skin, human-computer interaction, monitoring human motion and personal healthcare, etc. E-textiles exhibit remarkable performances in energy storage, sensing, actuation, and communication. Recently, nanomaterials with excellent electrical and mechanical properties, such as carbon nanotubes, metal nanowires, and graphene, have been used to prepare conductive yarns. However, silver nanowires (AgNWs) have shown promising prospects in the application of conductive yarns due to their excellent electrical conductivity and ductility. In addition, various methods have been employed to fabricate AgNWs-based conductive yarns, such as spray coating, dip coating, laser scribing, and spin coating. Among them, the easiest and most convenient met...

Claims

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Application Information

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IPC IPC(8): D06M11/83D06M15/356D06M15/643D02G3/44D01D5/12D06M101/32
CPCD06M11/83D06M15/356D06M15/643D02G3/441D01D5/12D06M2101/32
Inventor 潘军杨中林王雯雯叶萃
Owner ZHEJIANG UNIV OF TECH
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