Method for preparing high-sensitivity flexible piezoresistive sensor based on fractured microstructure

A piezoresistive sensor and high-sensitivity technology, which is applied in the field of flexible wearable device preparation, can solve the problems of wearable piezoresistive sensors such as low sensitivity, complex preparation process, and unstable performance, and achieve mass production, good conductive network, The effect of high electron transport ability

Active Publication Date: 2020-11-24
工科思维技术(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005]The purpose of this invention is to solve the problems of low sensitivity, complex preparation process, unstable performance and high detection limit of current wearable piezoresistive sensors

Method used

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  • Method for preparing high-sensitivity flexible piezoresistive sensor based on fractured microstructure
  • Method for preparing high-sensitivity flexible piezoresistive sensor based on fractured microstructure
  • Method for preparing high-sensitivity flexible piezoresistive sensor based on fractured microstructure

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Experimental program
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Effect test

Embodiment 1

[0040] A high-sensitivity flexible piezoresistive sensor designed based on fractured microstructure, including: polyurethane sponge, carbon nanotube solution and electrodes. Specifically, it is achieved through the following processes:

[0041]1) Carbon nanotube solution preparation: Weigh a small amount of carbon nanotubes and dissolve them in sodium dodecyl sulfate solution, and disperse them in an ice bath using an ultrasonic cell disperser to obtain a carbon nanotube solution.

[0042] 2) Preparation of conductive carbon nanotube sponge: Soak the polyurethane sponge in the carbon nanotube solution prepared in step 1), take it out and drain after 1 min, first use a centrifuge to remove excess solution on the surface, and then dry it in an oven.

[0043] 3) Pre-pressing treatment of conductive carbon nanotube sponge: through a press and a customized mold with a thimble (see figure 2 ), applying pre-pressure to the prepared conductive carbon nanotube sponge in step 2), so t...

Embodiment 2

[0055] In the present embodiment, adopt foam to be density 50kg / m 3 Polyurethane foam, the size of polyurethane foam is 6cm×4cm×1.5cm, the water absorption rate is 2%, the porosity is 96%; the concentration of carbon nanotubes is 0.9wt.%; the pre-pressure applied by the press is 90%, and the diameter of the customized mold ejector About 4mm. The conductive carbon nanotube sponge is prepared by adsorbing the carbon nanotube solution on the polyurethane sponge, and then the carbon nanotube network structure is anchored by the pre-pressing process to increase the contact area between the carbon nanotubes in the deformed state (see Figure 4 ), and finally add electrodes at both ends of the sponge, and prepare a high-sensitivity flexible piezoresistive sensor based on the fracture microstructure design.

[0056] Finally, a flexible piezoresistive sensor that can accurately detect pulse beating can be fabricated.

Embodiment 3

[0058] In the present embodiment, adopt foam to be density 60kg / m 3 Polyurethane foam, the size of polyurethane foam is 3cm×3cm×1.5cm, the water absorption rate is 3%, the porosity is 97%; the concentration of carbon nanotubes is 0.9wt.%; the pre-pressure applied by the press is 95%, and the diameter of the customized mold ejector pin about 5mm. The conductive carbon nanotube sponge is prepared by adsorbing the carbon nanotube solution on the polyurethane sponge, and then the carbon nanotube network structure is anchored by the pre-pressing process to increase the contact area between the carbon nanotubes in the deformed state (see Figure 4 ), and finally add electrodes at both ends of the sponge, and prepare a high-sensitivity flexible piezoresistive sensor based on the fracture microstructure design. Finally, a flexible piezoresistive sensor that can accurately detect the beating of the heart can be fabricated.

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Abstract

The invention discloses a method for preparing a high-sensitivity flexible piezoresistive sensor based on a fracture microstructure, relates to the field of preparation of flexible wearable equipment,and aims to solve the problems of low sensitivity, complex preparation process, unstable performance and high detection limit of a current wearable piezoresistive sensor. The preparation method comprises the following steps: adsorbing a large amount of carbon nanotube solution through polyurethane sponge to obtain conductive carbon nanotube foam, and forming a conductive network in the conductivecarbon nanotube foam after centrifugal drying; increasing the contact area of the carbon nanotubes by adopting a pre-pressing process, so that the electron transmission capacity in a deformation state is improved; and finally, assembling electrodes on the upper surface and the lower surface of the conductive carbon nanotube film to prepare the flexible piezoresistive sensor. The method has the advantages of simple process, low cost, capability of realizing large-batch production and the like, and meanwhile, has extremely high stability and sensitivity and extremely low detection limit. The method is applied to the field of flexible wearable equipment preparation.

Description

technical field [0001] The invention relates to the field of preparation of flexible wearable devices, in particular to a method for preparing a high-sensitivity flexible piezoresistive sensor based on a fractured microstructure. Background technique [0002] Flexible pressure sensors have received great attention in the design of future portable and wearable devices due to their advantages such as wide range, high sensitivity, response time, portability, comfort of use, and multi-functional integration. For example, flexible and stretchable sensors can be used in fields such as human-computer interaction, health monitoring, and biomedicine, presenting a huge market prospect. According to different sensing mechanisms, pressure sensors can be divided into three types: piezoresistive, piezoelectric and capacitive. The piezoresistive pressure sensor (referred to as the piezoresistive sensor) has the advantages of small size, simple preparation process, convenient signal acquis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/18B82Y15/00B82Y40/00
CPCG01L1/18B82Y15/00B82Y40/00
Inventor 钟晶卢东
Owner 工科思维技术(深圳)有限公司
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