Flexible sensor and preparation method thereof

A flexible sensor and sensing layer technology, applied in the field of strain sensors, can solve the problems of low sensitivity, poor biological tolerance, inability to apply, etc., and achieve the effect of simple preparation process and high success rate

Active Publication Date: 2018-07-24
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventors have found that there are at least the following problems in the prior art: First, when the flexible sensor meets the requirement of stretch rate and can be used in wearable electronic devices, its sensitivity is low and it is not suitable for monitoring Human pulse, breathing and other signals; second, when the flexible sensor meets the sensitivity requirements, its stretch rate is greatly reduced, and its biological tolerance is poor, so it cannot be applied to wearable electronic devices

Method used

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  • Flexible sensor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] 1. Clean the glass sheet with clean ethanol, blow it dry with nitrogen, and paste the high temperature resistant tape at equal distances.

[0092] 2. After the nano-copper wire dissolved in isopropanol (IPA) is ultrasonically dispersed, use a dropper to absorb the dispersion solution and evenly drop it on the high-temperature resistant tape. When the board is heated at high temperature, the nano-copper wires intersect and fuse to form a conductive network.

[0093] 3. Evenly spin-coat liquid polydimethylsiloxane (PDMS) on the glass sheet, then place it on a hot plate and heat it to solidify, then peel it off from the glass sheet. The conductive network of nano-copper wires has been embedded on the surface of PDMS, and the A clear pipe cavity structure is formed at the copper wire.

[0094] 4. Apply silver glue on both sides of the nano-copper wire film layer, stick the wires and attach the top layer of PDMS.

[0095] 5. Inject the conductive liquid material PEDOT:PSS ...

Embodiment 2

[0097] 1. Clean the glass sheet with clean ethanol, blow it dry with nitrogen, and paste the high temperature resistant tape at equal distances.

[0098] 2. After the nano-copper wire dissolved in IPA is ultrasonically dispersed, use a dropper to absorb the dispersion solution and evenly drop it on the high-temperature-resistant tape. After the IPA volatilizes, place the glass sheet on a hot plate in the glove box to heat at high temperature. The nano-copper wires intersect and fuse to form a conductive network.

[0099] 3. Evenly spin-coat platinum-catalyzed silicone rubber on the glass sheet. After curing at room temperature, peel it off from the glass sheet. The conductive network of nano-copper wires has been embedded on the surface of platinum-catalyzed silicone rubber, and an obvious pipeline cavity is formed at the nano-copper wire. structure.

[0100] 4. Apply silver glue on both sides of the nano-copper wire film layer, stick the wires and attach the top layer of pla...

Embodiment 3

[0103] 1. Clean the glass sheet with clean ethanol, blow it dry with nitrogen, and paste the high temperature resistant tape at equal distances.

[0104] 2. After ultrasonically dispersing the ethanol-soluble nano-copper wires, use a dropper to absorb the dispersion solution and evenly drop-coat it on the high-temperature-resistant tape. After the ethanol volatilizes, the nano-silver wires intersect and fuse to form a conductive network.

[0105] 3. Evenly spin-coat liquid PDMS on the glass sheet, then heat it on a hot plate until solidified, and peel it off the glass sheet. The nano-silver wire conductive network has been embedded on the PDMS surface and the nano-copper wire has formed an obvious pipeline cavity structure. Apply silver glue on both sides of the nano-silver wire film layer, glue the wires and attach the top layer of PDMS.

[0106] 4. The conductive liquid material PEDOT:PSS is injected into the cavity structure of the pipeline between the two layers of PDMS to...

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Abstract

The embodiment of the invention provides a flexible sensor and a preparation method thereof. The sensor comprises two layers of flexible substrates, electrodes and a sensing layer. A closed pipeline cavity is arranged between the two layers of flexible substrates. The closed pipeline cavity includes the sensing layer. The sensing layer is composed of a conductive solid and conductive liquid or composed of the conductive solid and a metal film. The electrodes are connected with the sensing layer and outwardly stretch out of the boundary of the flexible substrates. The preparation method of thesensor comprises the steps that a pipeline cavity structure is prepared on a hard substrate, the liquefied conductive solid or the flexible substrate plate is coated on the pipeline cavity to form thepipeline cavity structure, the electrodes are adhered and then another flexible substrate is packaged and then the conductive liquid is injected so that the sensor is obtained. The sensor has high sensitivity, high stretchable rate and high tolerability and can be applied to the wearable electronic equipment and can rapidly respond to face surface, body movement, pulse, respiration and multiple other life signals.

Description

technical field [0001] The invention relates to the technical field of strain sensors, in particular to a wearable flexible sensor. Background technique [0002] Wearable electronic devices, which can interact with the human body and monitor them for a long time, have received extensive attention in recent years. So far, flexible sensors combined with clothing or electronic skins that are in direct contact with the skin have been prepared to realize real-time monitoring of the physical, chemical, biological and environmental conditions of the human body. Wearable electronic devices have high requirements for the sensors installed in them. Such sensors must meet the requirements of high efficiency, high stretchability, flexibility, durability, low power consumption, biological tolerance and lightness. Electronic skin The requirements for the sensor are more stringent, and the stretch rate ε>100%. When people move their knees, fingers and other joints, they not only need ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/22
CPCG01L1/22
Inventor 刘川韩宋佳刘春瑞
Owner SUN YAT SEN UNIV
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