Electrochemically activated and reduced graphene oxide structure
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Solution Overview
Problem
Current neuroprosthetic technologies face limitations in interface precision, durability, and biocompatibility due to the use of materials like platinum, platinum-iridium, and titanium nitride, which degrade and cause immune responses, while conductive polymers like PEDOT:PSS suffer from chemical and mechanical degradation during stimulation, and existing graphene-based materials are too bulky for miniaturization.
Innovation Solution
A hydrothermally reduced graphene oxide (HTrGO) structure is electrochemically activated to increase capacitance and reduce impedance by allowing charged ions to permeate through its porous structure, maintaining biocompatibility and flexibility, and is fabricated using a method involving filtration, hydrothermal reduction, and electrochemical activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metallic microelectrodes (Pt, Pt/Ir, IrOx, TiN) are used for neural interfacing, then electrical stimulation and recording can be achieved, but the materials degrade over time and cause immune responses
Solution Approach 1:
The patent changes the material composition from traditional metals to reduced graphene oxide, fundamentally altering the chemical and physical parameters of the electrode material to achieve both durability and biocompatibility
Solution Approach 2:
The patent uses composite structures combining reduced graphene oxide with conductive polymers or metal nanoparticles to achieve the desired electrical properties while maintaining biocompatibility and mechanical flexibility
2Measurement precision
If electrode size is reduced to increase interface precision and resolution, then recording and stimulation resolution improve, but the intrinsic impedance and charge injection limit of materials become limiting factors
Solution Approach 1:
The patent transitions from bulk metal electrodes to two-dimensional graphene-based materials, utilizing the unique properties of 2D materials to achieve high surface area to volume ratios that improve charge injection capability while maintaining small geometric dimensions
Solution Approach 2:
The patent employs porous or highly textured graphene structures that increase the effective surface area available for charge transfer, thereby improving charge injection limit and reducing impedance without increasing the overall device footprint
3Object-generated harmful factors
If flexible and thin materials are used to match tissue mechanical properties and minimize immune response, then biocompatibility improves, but long-term chemical and mechanical stability becomes challenging
Solution Approach 1:
The patent creates composite structures that combine the flexibility of thin graphene layers with the mechanical strength of supporting substrates or scaffolds, achieving both tissue-matching mechanical properties and long-term stability
Solution Approach 2:
The patent utilizes thin film graphene structures that inherently match the mechanical compliance of soft brain tissue, reducing the foreign body response while maintaining structural integrity through the exceptional strength-to-thickness ratio of graphene
4Reliability
If high capacitance materials are used to increase charge injection limit and reduce impedance, then neural stimulation and recording performance improves, but the complexity of achieving stable high capacitance in miniaturized electrodes increases
Solution Approach 1:
The patent exploits the unique electrical parameters of graphene, particularly its high electron mobility and tunable work function, to achieve high capacitance values in ultraminiaturized electrodes without requiring complex multi-layer structures
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 HTrGO structure achieves high charge injection limits, low impedance, and long-term stability, enabling high-resolution neural recording and stimulation with minimal tissue damage and immune response, suitable for chronic implantation.
Implementation Method 1
allowing charged ions to permeate through its porous structure
Implementation Method 2
increase capacitance and reduce impedance
Implementation Method 3
hydrothermally reduced graphene oxide (HTrGO) structure
Implementation Method 4
electrochemically activated
Data Source
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AI summary
The present invention relates to a reduced graphene oxide structure for stimulation and/or recording of the central and/or peripheral nervous system comprising a stack of layered, reduced graphene oxide flakes, wherein the reduced graphene oxide structure is electrochemically activated.