Composite Microelectrode Array Coating for Uniform Electric Fields
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Solution Overview
Problem
Miniaturization of neural electrodes leads to increased electrode impedance and decreased capacitance, causing uneven electric field distribution and edge effects during electroplating, which affects their electrochemical properties and restricts their application in life science fields.
Innovation Solution
A composite array electrode with a microelectrode array substrate and a modification layer comprising electrically conductive layers of nano platinum, nano iridium, or electrically conductive polymers, arranged in an array to disperse the electric field uniformly and enhance electrochemical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the electrode size is reduced for miniaturization, then the electrode can be used for integrated and miniaturized microelectrode array, but the electrode impedance increases and capacitance decreases
Solution Approach 1:
The patent introduces a porous coating layer on the microelectrode surface with controlled porosity (30-70%). This porous structure increases the effective surface area without increasing the geometric size, thereby reducing impedance and increasing capacitance while maintaining the miniaturized form factor.
Solution Approach 2:
The patent uses composite materials consisting of a metallic base (copper, aluminum, or stainless steel) combined with a porous coating layer made of materials like titanium oxide, platinum, or carbon. This composite structure provides both the mechanical strength of the metal and the electrochemical performance of the porous material.
2Reliability
If surface modification is performed to improve electrochemical property, then the electrochemical property can be enhanced, but the edge effect becomes more severe due to uneven electric field distribution
Solution Approach 1:
The patent applies local quality by creating a porous coating layer with specific local properties (porosity, thickness, material composition) that are optimized for electrochemical performance. The porous structure is distributed uniformly across the electrode surface, including edge regions, to locally improve electrochemical properties while managing edge effects.
Solution Approach 2:
The patent changes physical and chemical parameters of the electrode surface by controlling the porosity (30-70%), thickness (1-10 μm), and material composition of the porous coating layer. These parameter changes improve electrochemical performance while the uniform application process maintains plating thickness uniformity across different regions.
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 solution achieves low impedance, high charge storage capability, and improved mechanical and electrochemical stability, enabling wide detection ranges and good detection linearity, suitable for applications in neurophysiology and brain science research.
Implementation Method 1
the electric field distributes uniformly on the microelectrode surface of the composite array electrode
Implementation Method 2
during the electroplating process, the higher density of electric field distribution at electrode edge may lead to quick electrodeposition
Implementation Method 3
the 3D nano structure based on electrically conductive layer provides huge surface area, which greatly improves electrochemical property of electrode
Data Source
AI summary
Provided are composite array electrode, preparation method thereof and use thereof. The composite array electrode comprises a microelectrode array substrate, and a modification layer formed on a surface of a microelectrode of the microelectrode array substrate, wherein the modification layer comprises a plurality of electrically conductive layers arranged at intervals on the surface of the microelectrode, an insulating layer arranged on the surface of the microelectrode except the electrically conductive layers, and wherein material for the electrically conductive layers comprises one or more of nano platinum, nano iridium, conductive polymer and carbon nanotubes. The composite array electrode effectively eliminates the influence of edge effect such that the electric field distributes uniformly on the microelectrode surface of the composite array electrode, significantly improving electrochemical performance and detection capability of the electrode.