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CN-122004870-A - Dry flexible stretchable electrode, array high-density electrode group, and preparation methods and applications thereof

CN122004870ACN 122004870 ACN122004870 ACN 122004870ACN-122004870-A

Abstract

The invention provides a dry flexible stretchable electrode with a conductive-high dielectric heterostructure, an arrayed high-density electrode set, a preparation method and application thereof. The dry flexible stretchable electrode comprises a high-dielectric elastomer layer and a conductive layer which are arranged in a stacked manner, wherein the high-dielectric elastomer layer is formed by doping or penetrating a conductive or dielectric material into an elastomer, the conductive layer is formed by printing and depositing gold, silver, copper, carbon or conductive polymers, one side, far away from the conductive layer, of the high-dielectric elastomer layer is used for attaching a human body, and one side, far away from the high-dielectric elastomer layer, of the conductive layer is connected with a collecting card through an electrode wire and used for detecting human body electrophysiological signals. The gel patch is ready to use, greatly improves the use convenience, avoids the signal attenuation problem caused by gel drying, and simultaneously avoids or reduces the environmental electromagnetic influence, so that the gel patch is particularly suitable for long-term and continuous physiological signal monitoring.

Inventors

  • TAI YANLONG
  • FENG CONG
  • LI GUANGLIN

Assignees

  • 中国科学院深圳先进技术研究院

Dates

Publication Date
20260512
Application Date
20260209

Claims (10)

  1. 1. A dry flexible stretchable electrode is characterized by comprising a high dielectric elastomer layer and a conductive layer which are laminated; The high dielectric elastomer layer is made of conductive material, dielectric material or high dielectric polymer doped or permeated into elastomer, and the conductive layer is made of conductive material of gold, silver, copper, carbon or conductive polymer through printing and depositing; The high dielectric elastomer layer is used for attaching a human body on one side far away from the conductive layer, and the high dielectric elastomer layer is connected with the acquisition card through an electrode wire on one side far away from the high dielectric elastomer layer and used for detecting human electrophysiological signals.
  2. 2. The dry flexible stretchable electrode according to claim 1, wherein said conductive or dielectric material comprises one or more combinations of silver ink, carbon nanotubes, graphene, liquid metal or barium titanate, conductive polymer.
  3. 3. The dry flexible stretchable electrode according to claim 1, wherein said elastomer comprises one or more combinations of epoxy elastomers, polydimethyl siloxane, polyurethane or Ecoflex rubber.
  4. 4. A method of making a dry flexible stretchable electrode according to any one of claims 1 to 3, comprising: (1) Adding or penetrating conductive or dielectric materials into the elastomer to obtain a heterogeneous mixed system, adding a curing agent into the heterogeneous mixed system, and uniformly mixing to obtain mixed slurry; (2) And forming a patterned conductive layer on one surface of the high dielectric elastomer layer by printing and depositing gold, silver, copper, carbon or conductive polymers to obtain the dry flexible stretchable electrode.
  5. 5. The method for preparing a dry flexible stretchable electrode according to claim 4, wherein the step (1) comprises the steps of pre-slowly dropping the conductive or dielectric material into the elastomer at a dropping speed of 1-100 drops/min, a stirring speed of 100-1000 rpm, and a stirring time of 0.1-100 hours; The addition amount of the conductive or dielectric material is more than 0 and less than or equal to 300% by mass of the addition amount of the elastomer.
  6. 6. The method for preparing the dry flexible stretchable electrode according to claim 4, wherein the step (1) specifically further comprises adding a curing agent into the mixed system, uniformly mixing, performing vacuum defoaming, and then placing into a vacuum oven to cure for 0.5-20 hours at a temperature of 25-200 ℃; Wherein the mass ratio of the elastomer to the curing agent is 1:1-100:1.
  7. 7. The method for preparing a dry flexible stretchable electrode according to claim 6, wherein the specific parameters of the vacuum oven are that the vacuum degree is controlled to be-0.08 MPa to-0.1 MPa, the temperature is firstly increased to 25-200 ℃ from room temperature at a heating rate of 1-5 ℃ per minute, then the temperature is kept at constant temperature for 0.5-20 hours, and after solidification is completed, the temperature is cooled down to room temperature along with the furnace or is cooled down to room temperature by adopting a program.
  8. 8. Use of a dry flexible stretchable electrode according to any of claims 1 to 3 in the fields of wearable devices, long-term health monitoring and dynamic physiological signal acquisition.
  9. 9. An arrayed high-density electrode assembly comprising a plurality of the dry flexible stretchable electrodes of any of claims 1-3, the plurality of dry flexible stretchable electrodes being distributed in an arrayed high-density pattern; wherein the arrayed high density forms include one or more of a high density arrangement in a horizontal direction, a high density arrangement in a 3D curl, and a high density arrangement in a vertical stack.
  10. 10. The array of high density electrodes of claim 9, wherein a plurality of the dry flexible stretchable electrodes are arranged in a square or rectangle; the array high-density electrode group comprises A 2 dry flexible stretchable electrodes, wherein A is a natural number greater than 1, and the number of the dry flexible stretchable electrodes arranged in the transverse direction and the longitudinal direction in the array high-density electrode group is equal to form a square array; Or the array high-density electrode group comprises at least two dry flexible stretchable electrodes, and the at least two dry flexible stretchable electrodes are distributed along the same straight line to form a rectangular array; Each dry flexible stretchable electrode is connected with an electrophysiology acquisition card aiming at myoelectricity, electrocardio and electroencephalogram through an electrode wire.

Description

Dry flexible stretchable electrode, array high-density electrode group, and preparation methods and applications thereof Technical Field The invention relates to the technical field of man-machine interaction intelligent sensing, in particular to a dry flexible stretchable electrode with a conductive-high dielectric heterostructure, an arrayed high-density electrode group, a preparation method and application thereof. Background The accurate detection and analysis of bioelectric signals, long-time detection and service are of great significance in the fields of modern medical diagnosis, neuroscience research and emerging man-machine interaction. As a core component of the bioelectric signal acquisition system, the performance of the electrode directly determines the signal quality and the stability of the system operation. For a long time, commercial gel electrodes have dominated electrophysiological monitoring, which is mainly beneficial for their low impedance interface formed by electrolyte gel, enabling high quality signal acquisition. However, with the rapid development of man-machine interaction technology and wearable medical devices to long-term monitoring, home use and convenience, the inherent defects of the conventional gel electrode are increasingly highlighted. Such electrodes rely on electrolytic gels as conductive media, which are subject to gradual desiccation upon exposure to air, resulting in a significant increase in contact resistance and a consequent decrease in signal quality and thus failure to be used for long-term monitoring. In a practical application scenario, the electrode performance is affected by the dynamic characteristics of human skin tissue. The grease secreted by the skin can make the contact interface between the electrode and the skin unstable, sweat can dilute the conductive gel, change the electrolyte concentration of the conductive gel, and form an unnecessary conductive bridge between the electrodes, so that signal baseline drift and motion artifact are aggravated, and even electrode falling is caused in severe cases. In addition, gel electrodes are extremely sensitive to environmental factors. The changes in temperature and humidity can directly affect the viscosity and conductivity of the gel, thereby affecting the signal quality. In a high temperature and high humidity environment, the gel may become thin due to excessive absorption of water, resulting in displacement of the electrode or short circuit, and in a dry environment, the gel has an increased water loss rate, resulting in further shortening of the effective working time. In the aspect of actual operation, the wearing process of the gel electrode is tedious and time-consuming, the gel electrode needs to be thoroughly cleaned after being used, and is usually a disposable product, so that the cost of a user is increased, a large amount of biological garbage is generated, and the gel electrode does not conform to the development concept of green and environment protection. These limitations greatly limit their potential in long-term dynamic monitoring applications with everyday human-machine interactions. Although there have been some related attempts at dry electrodes, they have suffered from the common problems of too high contact resistance, sensitivity to micro-motion, low signal-to-noise ratio, etc. Especially in dynamic scenarios, the signal quality is still difficult to compare favorably with commercial gel electrodes, which restricts its wide application in precision diagnostics and long-term health monitoring. Disclosure of Invention In order to solve the technical problems, the invention provides a dry flexible stretchable electrode, an arrayed high-density electrode set, and a preparation method and application thereof. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The application provides a dry flexible stretchable electrode which comprises a high-dielectric elastomer layer and a conductive layer which are stacked, wherein the high-dielectric elastomer layer is formed by penetrating or doping conductive or dielectric materials into an elastomer, the conductive layer is formed by printing and depositing gold, silver, copper, carbon or conductive polymers and the like, one side, far away from the conductive layer, of the high-dielectric elastomer layer is used for attaching a human body, and one side, far away from the high-dielectric elastomer layer, of the conductive layer is connected with a collecting card through an electrode wire and used for detecting electrophysiological signals of the human body. It can be seen that the conductive-high dielectric heterostructure formed by stacking high dielectric elastomer layers and conductive layers in the present application. Wherein, according to specific application requirements, elastomer materials with different moduli, elongation at break and biocompatibility can be selected. Further, the condu