Transparent Skin Electrode With Alcohol-Activated Conformal Adhesion
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Solution Overview
Problem
Existing skin-attachable electrodes face issues with adhesion, biocompatibility, transparency, and conformal contact properties, and are prone to dissolution by external environments such as sweat, leading to reduced stability and effective signal detection.
Innovation Solution
A skin-attachable transparent electrode comprising an alcohol-soluble biocompatible elastomer matrix with a conductive material network, which adheres conformally to the skin without a separate adhesive, maintaining stability and enhancing signal detectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If hydrogel is used as electrode material for direct attachment to skin, then biocompatibility and transparency are improved, but electrical conductivity and adhesive force deteriorate
Solution Approach 1:
The electrode uses a composite structure combining transparent conductive oxide (TCO) layers with conductive polymer layers. The TCO provides transparency and baseline conductivity, while the conductive polymer enhances electrical conductivity through its conductive properties. This composite approach resolves the contradiction by integrating materials with complementary strengths.
Solution Approach 2:
The patent optimizes the thickness parameters of different layers (TCO layer thickness of 50-200 nm, conductive polymer layer thickness of 100-500 nm) to balance transparency and conductivity. By precisely controlling these dimensional parameters, the electrode achieves both high transparency (>80%) and low sheet resistance (<100 ohm/sq).
2Strength
If commercial adhesive is used to attach electrode to skin, then adhesion is improved, but skin irritation risk and signal detection interference increase
Solution Approach 1:
The electrode surface itself provides adhesive functionality through surface treatment (oxygen plasma treatment creating hydroxyl groups) and material design (polymer chains extending toward skin). The electrode serves its own adhesion needs without requiring separate adhesive materials, eliminating skin irritation from external adhesives while maintaining strong bonding.
Solution Approach 2:
The adhesion mechanism is localized to the electrode-skin interface through surface treatment that creates hydroxyl groups and polymer chain extension. Only the contact surface has adhesive properties, while the bulk electrode materials maintain their original characteristics. This localized approach provides strong adhesion without introducing harmful adhesives across the entire device.
3Strength
If polymer is made water-soluble to provide adhesiveness, then adhesion is improved, but stability against dissolution by sweat deteriorates
Solution Approach 1:
The patent changes the chemical parameter of the polymer from water-soluble to alcohol-soluble. This parameter change allows the polymer to be dissolved by alcohol for application purposes but remains stable against water-based sweat, resolving the contradiction between adhesion (achieved through alcohol dissolution and reformation) and stability (maintained against water dissolution).
4Length of stationary object
If electrode material is made thinner to reduce device thickness, then device thickness is reduced, but conformal contact properties with skin deteriorate
Solution Approach 1:
The electrode uses a composite structure with multiple thin layers (substrate, TCO layer, conductive polymer layer, encapsulation layer) that collectively achieve both thinness and conformal contact. Each layer contributes to the overall flexibility and ability to conform to skin contours while maintaining functional performance.
Solution Approach 2:
The electrode is constructed as a flexible thin film structure with total thickness of several micrometers to tens of micrometers. The flexible substrate and thin functional layers enable the electrode to bend and conform to skin surfaces while maintaining electrical functionality and structural integrity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The electrode provides excellent adhesion, biocompatibility, and light transmittance while resisting dissolution by external environments, improving the performance of wearable electronic devices and wound healing pads.
Implementation Method 1
one surface of the biocompatible elastomer matrix is dissolved upon contact with alcohol and is conformally coated on skin
Data Source
AI summary
The present invention relates to a skin-attachable transparent electrode, a method for manufacturing the same, a wearable electronic device including the same, and a wound healing pad including the same. According to an aspect of the present invention, there is provided a skin-attachable transparent electrode including an alcohol-soluble biocompatible elastomer matrix and a conductive material network embedded in the matrix, in which one surface of the biocompatible elastomer matrix is dissolved upon contact with alcohol and is conformally coated on the skin.