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Flexible electrode, preparation method thereof and myoelectricity sensor

A flexible electrode and electrode technology, which is applied in the field of flexible electronics and information control, can solve problems such as uneven distribution of liquid metal and overflow of liquid metal droplets at the bottom of the electrode, and achieve high flexibility, prevent liquid metal overflow, and stable performance Effect

Active Publication Date: 2018-03-06
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large specific gravity of the liquid metal, the liquid metal tends to sink to the bottom during the actual static solidification process, which causes the problem of uneven distribution of the liquid metal in the flexible electrode, and even a liquid state at the bottom of the electrode when the sinking is serious The phenomenon of metal droplet overflow

Method used

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  • Flexible electrode, preparation method thereof and myoelectricity sensor
  • Flexible electrode, preparation method thereof and myoelectricity sensor
  • Flexible electrode, preparation method thereof and myoelectricity sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] In this embodiment, the schematic diagram of the structure of the flexible electrode is as follows figure 1 , 2 As shown, it includes an electrode inner layer 1-1, a protective layer 1-2 and a conductive connector 1-3.

[0055] The outer layer of the electrode is conductive and thinly covers the bottom and sides of the inner layer of the electrode.

[0056] The conductive connector 1-3 is an electrode female button of a conductive interface, one end of which extends into the bottom of the inner layer of the electrode and is connected with the outer layer of the electrode, and the other end is connected to an external component to form an electrical connection.

[0057] In this example, the liquid metal is GaInSn, which is an alloy with a mass ratio of Ga:In:Sn=62.5:21.5:16, which is liquid at room temperature and has conductivity. The solid conductive material is carbon nanotubes, preferably nanowires, graphene and the like. The elastomer is PDMS, which is a thermopl...

Embodiment 2

[0065] In this embodiment, the structure of the flexible electrode is the same as that in Embodiment 1.

[0066] In this example, the liquid metal is GaInSn, which is an alloy with a mass ratio of Ga:In:Sn=62.5:21.5:16, which is liquid at room temperature and has conductivity. The solid conductive material is carbon nanotubes, preferably nanowires, graphene and the like. The elastomer is PDMS, which is a thermoplastic elastomer that can stretch under certain stress.

[0067] In this example, the flexible electrode is made by the overall mold method, as follows:

[0068] (1) Prepare the overall mold for the outer layer of the electrode, and its structure is as follows Figure 6 As shown; mechanically stir PDMS and curing agent in proportion, then add a certain proportion of carbon nanotubes into an ultrasonic stirring device, and stir in a high-speed shear flow, so that carbon nanotubes are evenly dispersed in PDMS, and the package is prepared. Cover the electrode outer laye...

Embodiment 3

[0071] In this embodiment, the structure of the flexible electrode is the same as that in Embodiment 1.

[0072] In this example, the liquid metal is GaInSn, which is an alloy with a mass ratio of Ga:In:Sn=62.5:21.5:16, which is liquid at room temperature and has conductivity. The solid conductive material is carbon nanotubes, preferably nanowires, graphene and the like. The elastomer is PDMS, which is a thermoplastic elastomer that can stretch under certain stress.

[0073] In this example, the flexible electrode is made by mold method, as follows:

[0074] (1) Prepare the mold at the bottom of the electrode inner layer and the electrode outer layer, which is called the first mold, and its structure is as follows Figure 7 As shown, the bottom has a stepped structure;

[0075] Mechanically stir the PDMS and curing agent in proportion, then add a certain proportion of carbon nanotubes into the ultrasonic stirring device, and stir in the high-speed shear flow, so that the ca...

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Abstract

The invention discloses a flexible electrode which comprises an electrode inner layer, an electrode outer layer and a conductive contact. By mixing molten metal and fusion elastomer, the electrode inner layer is formed by curing; the electrode outer layer has the conductivity and covers the bottom of the electrode inner layer, and the electrode outer layer is composed of a solid conductive material and an elastomer, the solid conductive material is evenly distributed in the elastomer; one end of a conductive connector stretches into the bottom of the electrode inner layer, and the other end ofthe conductive connector is connected with an external element to form electric connection. The flexible electrode has the high conductivity and high flexibility, has the advantages of being safe, reliable, stable in performance and capable of being used for the myoelectricity sensor and the like, when the electrode is in use, the electrode outer layer can be attached to the skin, the contact resistance between the electrode and the skin is small, myoelectric signals with the high signal to noise ratio is collected, and the huge potential application value in rehabilitation medical engineering and motion monitoring is achieved.

Description

technical field [0001] The invention relates to the fields of flexible electronic technology and information control technology, in particular to a flexible electrode, its preparation method and an electromyographic sensor. Background technique [0002] With the development of flexible electronic technology and people's attention to smart medical care, myoelectric sensors that can be used continuously for a long time and can collect signals with high signal-to-noise ratio have attracted more and more attention. [0003] The electrode is the core of the sensor signal acquisition module, and its performance determines the performance of the sensor to a large extent. Electrodes are mainly divided into two categories: wet electrodes and dry electrodes. The wet electrode has good conductivity and mature technology, but the conductive glue used is easy to dry and is not suitable for long-term continuous use. Dry electrodes are mainly divided into three types: immersion microneed...

Claims

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Application Information

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IPC IPC(8): A61B5/0492A61B5/296
CPCA61B5/296
Inventor 尚杰唐大秀李润伟刘宜伟胡超
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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