Resistive flexible strain sensor based on drying-mediated self-assembly, and preparation method of resistive flexible strain sensor

A strain sensor, resistive technology, applied in the field of flexible sensors, resistive flexible strain sensors and their preparation, can solve the problems of difficult processing, high technical requirements, long preparation cycle of flexible strain sensors, etc., and achieve simple and environmentally friendly preparation process, application The effect of broad prospects and shortening the preparation cycle

Active Publication Date: 2019-06-07
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical defects of the existing flexible strain sensor based on the crack structure such as long preparation cycle, difficult processing and high technical requirements, the present invention provides a resistive flexible strain sensor based on dry-mediated self-assembly and its preparation method. The process is simple and the preparation is rapid, and it can process crack arrays arranged in parallel and with uniform geometric parameters on flexible substrates

Method used

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  • Resistive flexible strain sensor based on drying-mediated self-assembly, and preparation method of resistive flexible strain sensor
  • Resistive flexible strain sensor based on drying-mediated self-assembly, and preparation method of resistive flexible strain sensor
  • Resistive flexible strain sensor based on drying-mediated self-assembly, and preparation method of resistive flexible strain sensor

Examples

Experimental program
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Embodiment 1

[0060] A flexible strain sensor based on desiccation-mediated self-assembly, such as figure 1 , 2 As shown, it includes, arranged in order from top to bottom: a conductive layer 1 , a sensitive layer 2 and a flexible substrate 3 .

[0061] The conductive layer 1 is sputter-coated on the upper surface of the sensitive layer 2 . In the natural state, the structural parameters of the cracks on the surface of the conductive layer are basically the same as those of the sensitive layer.

[0062] Two electrodes (the first electrode 4 and the second electrode 5 ) are arranged on the conductive layer 1 , and an enameled wire 6 is respectively led out from the two electrodes for collecting electric signals.

[0063] The two electrodes do not touch each other. Preferably, the first electrode 4 is located at one end of the strain sensor, and the second electrode 5 is located at the other end of the strain sensor, so as to maximize the crack working area between the two electrodes.

[...

Embodiment 2

[0071] This embodiment provides a method for preparing a resistive flexible strain sensor based on drying-mediated self-assembly. Specifically, the method includes the following steps:

[0072] S1. Prepare an aqueous dispersion of acrylic resin colloid.

[0073] In this example, the parallel crack arrays were prepared by utilizing the film thickness gradient formed by the colloidal dispersion under the action of gravity flow, using the instrument-free scalable technique.

[0074] Specifically, step S1 includes:

[0075] S101, adding an aqueous acrylic resin with a particle diameter of 40-80 nm to deionized water to obtain an aqueous acrylic resin dispersion with a concentration of 0.3 g / mL.

[0076] S102, ultrasonically vibrate the prepared aqueous acrylic resin dispersion for 30 minutes, and then filter to obtain a filtrate.

[0077] S103. Store the filtered filtrate in a sealed bottle, and let it stand overnight to obtain an acrylic resin colloidal dispersion.

[0078] S2...

Embodiment 3

[0093] This embodiment also provides another method for preparing a resistive flexible strain sensor based on drying-mediated self-assembly. Specifically, the method includes the following steps:

[0094] S1. Preparation of polystyrene colloid.

[0095] In this example, the parallel crack arrays were prepared by utilizing the film thickness gradient formed by the colloidal dispersion under the action of gravity flow, using the instrument-free scalable technique.

[0096] Specifically, step S1 includes:

[0097] S101. Add polystyrene latex particles with a particle diameter of 50 nm to deionized water to obtain an aqueous dispersion of polystyrene colloidal particles with a concentration of 0.1 g / mL.

[0098] S102, ultrasonically vibrate the prepared aqueous dispersion of polystyrene colloidal particles for 30 minutes, and then filter to obtain a filtrate.

[0099] S103. Store the filtered filtrate in a sealed bottle, and let it stand overnight to obtain a polystyrene colloid...

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Abstract

The invention relates to a resistive flexible strain sensor based on drying-mediated self-assembly of colloidal particles into parallel cracks, and a preparation method of the resistive flexible strain sensor. The flexible strain sensor comprises a flexible substrate, a sensitive layer and a conductive layer which are arranged from bottom to top in sequence, wherein the flexible substrate is a thin film made of a flexible material; the sensitive layer is prepared from a thin film produced through drying of colloidal dispersions, and the upper surface of the sensitive layer is provided with a regular crack array structure; a pair of copper sheet electrodes are arranged on the conductive layer, and are respectively located at the two ends of the conductive layer; and an enameled wire is ledout of each electrode. The flexible strain sensor provided by the invention can be adhered to the surface of human skin or attached to clothes to achieve wearable monitoring of respiration, pulses, gaits, joint movements and the like of a human body; and through the drying-mediated method, the colloidal particles are self-assembled into the parallel cracks, so that the flexible strain sensor has the characteristics of high sensitivity, high speed and high efficiency of a preparation process, high simplicity and environmental friendliness of a preparation technique, high convenience in mass production, low cost and the like, and achieves broad application prospects.

Description

technical field [0001] The invention relates to a resistive flexible strain sensor based on drying-mediated self-assembly and a preparation method thereof, belonging to the flexible sensor technology. Background technique [0002] A sensor is a general term for a class of functional detection devices that can convert external information into visible, readable, storable electrical signals or other required forms of information output. A strain sensor is a type of sensor that generates strain based on an object's force and converts it into other readable signals. In recent years, traditional strain sensors have been greatly limited due to their own material properties, flexibility and detection accuracy, and are increasingly unsuitable in many emerging fields that require flexibility. Therefore, flexible strain sensors emerged as the times require. [0003] The flexible strain sensor is a flexible electronic device that converts the mechanical deformation of the sensitive b...

Claims

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Application Information

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IPC IPC(8): G01B7/16
Inventor 张俊秋孙涛韩志武刘林鹏牛士超侯涛王可军陈思琪王大凯
Owner JILIN UNIV
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