Three-layer self-healing flexible strain sensor and preparation method thereof

Patent metadata

Field	Value
Publication number	US-10816418-B2
Application number	US-201816036612-A
Country	US
Kind code	B2
Filing date	Jul 16, 2018
Priority date	May 9, 2018
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

A three-layer self-healing flexible strain sensor includes: a self-healing sensitive layer, wherein a self-healing encapsulating layer is respectively placed on an upper surface and a lower surface of the self-healing sensitive layer. The self-healing sensitive layer comprises a doped carbon material or a conductive composite. The three self-healing layers of the self-healing strain sensor can quickly repair the internal and external damage caused by the layered structure in a short period of time after the external damage, and does not require external stimulation. The three-layer self-healing structure strain sensor is simple in preparation without using a repair agent, which can achieve rapid self-repair at the room temperature, and can be repeatedly repair. The three-layer self-healing structure increases the strength and modulus of the strain sensor as well as increases the ability of the strain sensor to resist external damage.

First claim

What is claimed is:

1. A three-layer self-healing flexible strain sensor, comprising: a strain sensitive layer ( 2 ), wherein a encapsulating layers ( 1 ) are respectively placed on an upper surface and a lower surface of the strain sensitive layer ( 2 ), wherein the strain sensitive layer ( 2 ) and the encapsulating layers ( 1 ) each have self-healing function, and wherein the strain sensitive layer ( 2 ) consists of 0.8-1 parts by weight of poly acrylic acid (PAA), 0.1-0.2 parts by weight of polydopamine (PDA), and 0.02-0.05 parts by weight of a carbon material.

2. The three-layer self-healing flexible strain sensor, as recited in claim 1 , wherein the encapsulating layers ( 1 ) each comprise: 0.2-0.33 parts by weight of hydroxyl-terminated polydimethylsiloxane (PDMS), 0.8-1 parts by weight of polyacrylic acid (PAA), 0.070-0.086 parts by weight of N,N′-dicyclohexylcarbodiimide (DCC) and 0.050-0.056 parts by weight of 4-(dimethyl)aminopyridine (DMAP).

3. The three-layer self-healing flexible strain sensor, as recited in claim 1 , wherein the carbon material is selected from a group consisting of graphene, reduced graphene oxide, graphene quantum dots, graphene nano-platelets, carbon nano-tubes, and carbon nano-fibers.

Assignees

• Univ Electronic Sci & Tech China

Inventors

• Tai Huiling
• Yao Yujin
• Wang Dongsheng
• Yuan Zhen
• Jiang Yadong
• Xie Guangzhong
• Du Xiaosong

Classifications

• Y10T428/31504

  Composite [nonstructural laminate] · CPC title

• B32B2255/28

  Multiple coating on one surface · CPC title

• B32B2250/03

  3 layers · CPC title

• B32B2250/24

  All layers being polymeric · CPC title

• G01B7/18 Primary

  using change in resistance · CPC title