Composite flexible piezoresistive sensor based on bionic multilevel structure and preparation method of composite flexible piezoresistive sensor

A piezoresistive sensor and composite flexible technology, applied in the field of sensors, can solve the problems that piezoresistive sensors cannot have both high sensitivity and wide monitoring range, and achieve the effects of simple structure, easy preparation, and wide response range

Active Publication Date: 2021-11-19
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above-mentioned deficiencies, the purpose of the present invention is to provide a composite flexible piezoresistive sensor based on bionic multi-level structure and its preparation method, which can effectively solve the problem that existing piezoresistive sensors cannot have both high sensitivity and wide monitoring range

Method used

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  • Composite flexible piezoresistive sensor based on bionic multilevel structure and preparation method of composite flexible piezoresistive sensor
  • Composite flexible piezoresistive sensor based on bionic multilevel structure and preparation method of composite flexible piezoresistive sensor
  • Composite flexible piezoresistive sensor based on bionic multilevel structure and preparation method of composite flexible piezoresistive sensor

Examples

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Embodiment 1

[0050] This example provides a composite flexible piezoresistive sensor based on a bionic multilevel structure and its preparation method, which specifically includes the following steps:

[0051] S1. Preparation of PVDF nanofiber membrane: Put PVDF in a mixed solution of acetone and dimethylacetamide (DMAc) and stir at 60°C for 2 hours to obtain a transparent and uniform spinning precursor solution, wherein the volume ratio of acetone and DMAc is 1 : 1, the mass fraction of PVDF is 25%; Utilize the existing electrospinning equipment, prepare randomly oriented high-quality PVDF nanofibers, the spinning parameters are: the syringe is connected to a 20G needle, the loading voltage is 17kV, and the distance between the needle and the substrate is 12cm, the advancing speed is 0.02ml / min, the temperature is 31°C, the relative air humidity is 35-50%, the spinning time is 2h, the obtained film is placed in an oven at 40°C for 12h, and then at 140°C for 2h;

[0052] S2. Hydrophilic mo...

Embodiment 2

[0064] This example provides a composite flexible piezoresistive sensor based on a bionic multi-level structure and its preparation method. The only difference from Example 1 is that the electrospinning parameters in S1 are: the syringe is connected to a 20G needle, the loading voltage is 15kV, the needle and The distance between the substrates is 8cm, the propulsion speed is 0.01ml / min, the temperature is 26°C, the relative air humidity is 35% to 50%, and the spinning time is 2 hours. The obtained film is dried at 30°C for 13 hours, and then dried at 130°C. Continue to dry at ℃ for 3 hours; the rest of the steps and parameters are the same.

Embodiment 3

[0066] This example provides a composite flexible piezoresistive sensor based on a bionic multi-level structure and its preparation method. The only difference from Example 1 is that the electrospinning parameters in S1 are: the electrospinning parameters are: the syringe is connected to a 20G needle , the loading voltage is 19kV, the distance between the needle and the substrate is 15cm, the advancing speed is 00.04ml / min, the temperature is 31°C, the relative humidity of the air is 35% to 50%, and the spinning time is 0.5 hours. Dry for 10 hours, then continue drying at 150°C for 1.5 hours; the rest of the steps and parameters are the same.

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Abstract

The invention discloses a composite flexible piezoresistive sensor based on a bionic multilevel structure and a preparation method of the composite flexible piezoresistive sensor. The preparation method mainly comprises the following steps of: performing hydrophilic modification on a PVDF nanofiber membrane through using plasma, further performing in-situ polymerization on the surface of the PVDF nanofiber membrane subjected to hydrophilic modification to grow PANI nanowires, and preparing a PANI / PVDF composite conductive fiber membrane of a core-shell structure; preparing a multistage microstructure flexible electrode by simulating a micro-bulge structure on the surface of a rose petal and combining a magnetron sputtering technology; leading out an electrode through using silver paste and a copper lead wire, and preparing a novel multi-layer structure piezoresistive sensor with an interlocking bionic multi-stage structure electrode and a middle core-shell structure fiber membrane. The composite flexible piezoresistive sensor not only has high sensitivity and wide response range, but also has the advantages of simple structure, simplicity and convenience in preparation, low cost and the like.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a composite flexible piezoresistive sensor based on a bionic multilevel structure and a preparation method thereof. Background technique [0002] Flexible wearable pressure sensors have excellent force-electric conversion capabilities and have broad application prospects in personal medical monitoring, human-computer interaction, intelligent robots, and motion detection. Based on the different mechanisms of piezoresistive sensors, capacitive sensors, piezoelectric sensors, and triboelectric sensors, piezoresistive sensors have been widely developed due to their simple structure, cost-effectiveness, and ease of fabrication. Although some progress has been made in improving the sensitivity, detection limit, flexibility, and stability of piezoresistive sensors, the difficulty of simultaneously achieving high sensitivity and wide linear range is the main problem that currently limits...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/22B82Y15/00B82Y40/00
CPCG01L1/22B82Y15/00B82Y40/00
Inventor 邓维礼杨维清杨涛邓林钟珅熊达靳龙
Owner SOUTHWEST JIAOTONG UNIV
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