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A multi-material kirigami structure stretchable strain sensor and preparation method thereof

A strain sensor, multi-material technology, applied in the field of biomedical electronics, can solve the problems of poor adhesion, limited deformation ability of complex surfaces attached to substrates, poor adaptability to large-angle deformation requirements of fingers, etc., so as to reduce the impact of changes and improve the unidirectional Effect of strain detection accuracy

Active Publication Date: 2022-07-12
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sensor has a certain degree of extensibility due to the use of an elastic substrate, but it does not use a kirigami structure, and the deformation ability of the substrate attached to a complex curved surface is limited.
When the finger is bent at a large angle, it is easy to fall off from the surface of the finger, and the adhesion is poor
[0007] Therefore, it is necessary to develop a stretchable strain sensor with good extensibility, high strain accuracy in one direction, and strong adhesion, which can effectively solve the error introduced by the resistance change in the non-detection direction when the current strain sensor is deformed, and the demand for large-angle deformation of the finger Poor adaptability and other issues

Method used

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  • A multi-material kirigami structure stretchable strain sensor and preparation method thereof
  • A multi-material kirigami structure stretchable strain sensor and preparation method thereof
  • A multi-material kirigami structure stretchable strain sensor and preparation method thereof

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preparation example Construction

[0050] A preparation method of a multi-material kirigami structure stretchable strain sensor, comprising the following steps:

[0051] Step 1: Attach the elastic substrate 5 to the glass sheet sprayed with the release agent;

[0052] Step 2: using a microelectronic printer to print the strain-sensitive conductive material 1 on the elastic substrate 5 by dispensing and drying, and the strain-sensitive conductive material 1 is distributed along the length direction of the elastic substrate 5;

[0053] Step 3: Use a microelectronic printer to print the strain-insensitive conductive material 2 on the elastic substrate 5 by inkjet and dry it. 1 phase connection;

[0054] Step 4: Bond the external wire with the conductive material;

[0055] Step 5: spin-coating a layer of liquid elastic silica gel on the glass sheet, and after curing, it is used as an encapsulation layer, and the conductive material is encapsulated on the elastic substrate 5;

[0056] Step 6: Complete the pattern...

specific Embodiment

[0059] like figure 2 As shown, the processing flow of a typical multi-material kirigami structure stretchable strain sensor is mainly divided into the following steps:

[0060] The first step: attach the elastic substrate 5 to the glass sheet sprayed with the release agent;

[0061] The elastic substrate 5 is made of polydimethylsiloxane (PDMS) material, wherein the ratio of the body A and the curing agent B is 10:1, the thickness is 200 μm, the shape is a rectangle, and the size is 30 mm×15 mm.

[0062] The second step: using a microelectronic printer to print the strain-sensitive conductive material 1 onto the elastic substrate 5 by dispensing, the material is distributed along the finger direction, that is, the length of the elastic substrate, and heated at 120°C for 30 minutes.

[0063] The material used in the strain-sensitive conductive material 1 is carbon nanotubes.

[0064] Step 3: Use a microelectronic printer to print the strain-insensitive conductive material 2 ...

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Abstract

The invention discloses a multi-material kirigami structure extensible strain sensor and a preparation method thereof. The strain sensitive conductive material is combined with the strain non-sensitive conductive material, and the kirigami structure is introduced to improve the overall extensibility and adhesion to fingers. The preparation steps include: firstly attaching the elastic base to the glass sheet; then printing the conductive material on the elastic base and drying; next, bonding the external wire with the conductive material; and then continuing to spin a layer on the glass sheet The liquid elastic silica gel is used as an encapsulation layer after curing; after the assembly, the patterning process of the non-conductive material area of ​​the strain sensor is completed by laser cutting to form a kirigami structure. The new strain sensor has important practical value for improving unidirectional strain accuracy and finger bending conformability. It can effectively reduce the non-detection directional resistance change error of the strain sensor when the finger is bent and deformed, and the kirigami structure slit itself expands and deforms better. Adapt to large-angle bending needs.

Description

technical field [0001] The invention belongs to the technical field of biomedicine, and in particular relates to a stretchable strain sensor and a preparation method thereof. Background technique [0002] In recent years, the development of flexible electronic strain sensor devices has been very rapid, which can be used to detect various human physiological activities, and has great application potential in the fields of human-computer interaction, health monitoring, and flexible electronic skin. However, the structural design of most strain sensors is not highly optimized, and the adhesion is not good, so it is difficult to meet the deformation requirements when the finger is bent at a large angle. In addition, most of the strain sensors use a single strain-sensitive conductive material. When the finger is bent, the resistance change in the non-detection direction is easy to introduce errors, which leads to a decrease in the accuracy of the sensor's detection of the strain ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/16G01L1/18H05K3/12
CPCG01B7/20G01L1/18H05K3/12H05K3/1291
Inventor 吉博文阿凘荣胡志杰王慕尧曹馨月梁泽凯袁上钦冯慧成
Owner NORTHWESTERN POLYTECHNICAL UNIV