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CN-122004780-A - Star ring flexible electrode array based on fiber reinforced ionic liquid gel and preparation method thereof

CN122004780ACN 122004780 ACN122004780 ACN 122004780ACN-122004780-A

Abstract

The invention discloses a star-ring flexible electrode array based on fiber reinforced ionic liquid gel and a preparation process thereof, wherein the flexible sensing array comprises a substrate supporting layer, a functional composite layer and a sensing array layer, wherein the substrate supporting layer is made of elastic breathable materials and is provided with a curved surface profile attached to the surface of human skin, the functional composite layer is formed by ternary composite of ionic conductive components, a polymer matrix and a network reinforcing phase, the functional composite layer is prepared by combining solution casting with a gradient curing process, and the sensing array layer comprises a plurality of microstructure sensing units distributed in a matrix mode, and the sensing units adopt a bionic layout design to reduce mutual interference. The flexible sensing array provided by the invention has high conductivity (the conductivity is 0.1-1.0S/m), excellent flexibility (the tensile elongation at break is more than or equal to 200%) and anti-crosstalk characteristics (the signal crosstalk inhibition rate is more than or equal to 85%), so that the problems that the conductivity and the flexibility of the traditional flexible electrode are difficult to be compatible and the multi-channel signal crosstalk are fundamentally solved, and the high-fidelity signal acquisition and the long-term dynamic stability are realized.

Inventors

  • HAO SANWEI
  • WANG CHAO
  • SU YAFEI
  • ZHANG JING
  • SHAO CHANGYOU
  • CONG HAILIN

Assignees

  • 山东理工大学

Dates

Publication Date
20260512
Application Date
20260324

Claims (10)

  1. 1. A star-ring flexible electrode array based on fiber-reinforced ionic liquid gel, comprising: The substrate supporting layer is made of elastic breathable materials and has a curved surface profile which is attached to the surface of human skin; The functional composite layer is formed by ternary combination of an ion conductive component, a polymer matrix and a network reinforcing phase, and is prepared by combining solution casting and gradient curing processes; the sensing array layer comprises a plurality of microstructure sensing units which are arranged in a matrix, and the sensing units adopt a bionic layout design to reduce mutual interference; Wherein the mass ratio of the ion conductive component to the polymer matrix is 5% -25%, and the mass fraction of the network reinforcing phase in the functional composite layer is 0.5% -2%.
  2. 2. The multi-dimensional enhanced composite electrode flexible sensing array according to claim 1, wherein the ion conductive component is an imidazole or pyridine ionic liquid subjected to purification treatment, the purity is not lower than 99%, and the polymer matrix is medical gelatin.
  3. 3. The multi-dimensional, reinforced, composite electrode flexible sensing array of claim 1, wherein the network reinforcement phase is a mixture of nanofibers and polymer microfibers for constructing a multi-dimensional, three-dimensional network structure.
  4. 4. The multi-dimensional enhanced composite electrode flexible sensing array according to claim 1, wherein the sensing array layer comprises 12 sensing units, and the distance between adjacent sensing units is controlled within the range of 5-15 mm by adopting octopus-foot-shaped topological layout.
  5. 5. The multi-dimensional enhanced composite electrode flexible sensing array of claim 1, wherein the surface of the functional composite layer is covered with a biocompatible adhesive coating having a thickness of 5-10 microns, and the nonfunctional area is encapsulated with an insulating protective material.
  6. 6. The process for preparing the multi-dimensional enhanced composite electrode flexible sensing array according to claim 1, which is characterized by comprising the following steps: Firstly, crushing and sieving medical gelatin, adding deionized water according to a solid-to-liquid ratio of 1:10-1:20, stirring and dissolving at 50-60 ℃, and cooling to 30-40 ℃ for standby; step two, performing rotary evaporation and column chromatography purification on the ionic liquid raw material to ensure that the purity of the ionic liquid raw material reaches more than 99%; step three, slowly dripping the purified ionic liquid into a gelatin solution according to a preset proportion, and continuously stirring under a constant temperature condition; Step four, adding a network reinforcing phase into the mixed solution, and uniformly dispersing the mixed solution through ultrasonic treatment; step five, adding a cross-linking agent, continuously stirring, and standing at room temperature to primarily cross-link the system; step six, injecting the composite solution into a mould, and removing bubbles under a vacuum condition; step seven, adopting two-section temperature gradient to carry out solidification molding, and obtaining a primary electrode material after cooling and demolding; Step eight, carrying out surface treatment on the primary electrode material, spraying a biocompatible adhesive coating, and curing in a constant temperature and humidity environment; and step nine, forming a target shape through precision machining, and insulating and packaging the nonfunctional area to obtain the flexible sensing array.
  7. 7. The process for preparing the multi-dimensional enhanced composite electrode flexible sensor array according to claim 6, wherein the two-stage temperature gradient curing process in the seventh step is to process for 4-6 hours at 30 ℃ and then for 8-12 hours at 45-50 ℃.
  8. 8. The process for preparing the multi-dimensional reinforced composite electrode flexible sensing array according to claim 6, wherein the step eight is completed and further comprises pre-stretching domestication treatment, the pre-stretching amplitude is 5% -10%, and the cycle is 3-5 times.
  9. 9. The multi-dimensional enhanced composite electrode flexible sensing array according to claim 1, wherein the electrical conductivity of the functional composite layer is 0.1-1.0S/m, the tensile elongation at break is more than or equal to 200%, and the peel strength is more than or equal to 0.5N/cm.
  10. 10. The multi-dimensional enhanced composite electrode flexible sensing array according to claim 1, wherein the signal crosstalk inhibition rate of the sensing array layer under the dynamic deformation condition is more than or equal to 85%, and the contact resistance change rate is less than or equal to 10%.

Description

Star ring flexible electrode array based on fiber reinforced ionic liquid gel and preparation method thereof Technical Field The invention belongs to the technical field of flexible electronic materials, and particularly relates to a multi-dimensional enhanced composite electrode flexible sensing array and a preparation process thereof. Background Under the background of rapid development in the fields of wearable electronic equipment and intelligent health monitoring, the flexible sensor is used as a core functional component, and the performance of the flexible sensor directly determines the practical value of the whole system. Conventional flexible electrode materials typically employ simple blends of a single conductive polymer or conductive filler with an elastomeric matrix, which, while capable of performing the basic conductive function, exposes many limitations in practical applications. The key challenges faced by the prior art include firstly, difficult reconciliation of inherent contradiction between conductivity and flexibility, high conductivity often comes at the expense of material flexibility, and the conductive performance is obviously reduced due to excessive pursuit of flexibility, secondly, under a dynamic use environment, the electrical performance stability of the traditional electrode material is insufficient, irreversible structural damage and performance attenuation are easy to generate after repeated stretching and bending, and furthermore, the multichannel sensing array has serious signal crosstalk problem under a complex deformation condition, and the accuracy and reliability of signal acquisition are seriously affected by electromagnetic interference and mechanical coupling effect between sensing units. At present, material composite and structural designs are often adopted to improve performance. For example, conductive polymers are employed in combination with elastomers to increase flexibility, or ionic liquids are incorporated into the polymer network to increase conductivity. However, these methods have limitations in that it is difficult for a single material system to simultaneously meet multiple requirements of high conductivity, excellent flexibility and biocompatibility, and the conventional electrode array layout does not consider the influence of skin deformation on signal transmission, so that signal crosstalk is easy to occur under dynamic use conditions, resulting in distortion of monitoring data. The prior art is not provided with an effective scheme for cooperatively optimizing and decoupling the whole deformation and the local signal from the aspects of material origin and structural design. Therefore, the development of the composite electrode sensing array with high conductivity, excellent flexibility and anti-crosstalk characteristics has important practical significance for promoting the development of wearable electronic technology. Disclosure of Invention 1. Technical problem Aiming at the defects of the prior art, the invention provides a multi-dimensional enhanced composite electrode flexible sensing array and a preparation process thereof, and aims to solve the technical problems that the conductivity and flexibility of the traditional flexible electrode are difficult to be compatible, the dynamic stability is poor, the multi-channel signal crosstalk is poor and the like. 2. Technical proposal In order to achieve the above purpose, the present invention adopts the following technical scheme: a multi-dimensional enhanced composite electrode flexible sensing array, comprising: The substrate supporting layer is made of elastic breathable materials and has a curved surface profile which is attached to the surface of human skin; The functional composite layer is formed by ternary combination of an ion conductive component, a polymer matrix and a network reinforcing phase, and is prepared by combining solution casting and gradient curing processes; the sensing array layer comprises a plurality of microstructure sensing units which are arranged in a matrix, and the sensing units adopt a bionic layout design to reduce mutual interference; Wherein the mass ratio of the ion conductive component to the polymer matrix is 5% -25%, and the mass fraction of the network reinforcing phase in the functional composite layer is 0.5% -2%. As a preferable scheme, the ion conductive component is imidazole or pyridine ionic liquid subjected to purification treatment, and the purity is not lower than 99%. As a preferable scheme, the polymer matrix is medical gelatin, and has good biocompatibility and film forming property. Preferably, the network reinforcement phase is a mixture of nanofibers and polymer microfibers for constructing a multi-scale three-dimensional network structure. As a preferable scheme, the sensing array layer comprises 12 sensing units, and the distance between every two adjacent sensing units is controlled within the range of 5-15mm by adopting octopus fo