3D Percolated Conductive Nano-Network for Stretchable Strain Sensors
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Solution Overview
Problem
Conventional strain sensors face challenges in simultaneously achieving high stretchability and sensitivity, especially when applied to nonplanar structures like the human body, where both bending and tensile strain are present, due to material limitations.
Innovation Solution
A highly stretchable three-dimensional (3D) percolated conductive nano-network structure is manufactured by forming a 3D nano-structured porous elastomer with a periodic network, infiltrating a conductive solution, and evaporating the solvent to create a conductive network that maintains electrical characteristics under tensile strain, using materials like carbon nano-tubes, graphene, or silver nanowires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional conductive materials are used in strain sensors, then electrical conductivity is maintained, but stretchability and sensitivity cannot be simultaneously achieved
Solution Approach 1:
The patent employs a porous elastomer substrate with controlled pore size and distribution to enable the conductive network to stretch and deform while maintaining electrical connectivity. The porous structure allows the material to expand and contract, providing both stretchability and sensitivity for strain sensing applications.
Solution Approach 2:
The patent creates a composite structure combining elastomer matrix with conductive material networks (such as carbon nanotubes, graphene, or metallic nanowires). This composite approach allows the elastomer to provide mechanical flexibility and stretchability while the conductive network maintains electrical conductivity and enables sensing functionality.
2Measurement precision
If the conductive material density is increased to improve sensitivity, then initial resistance decreases, but stretchability is reduced
Solution Approach 1:
The patent creates non-uniform distribution of conductive material within the porous structure, with higher concentration in specific regions to optimize sensitivity while maintaining overall stretchability. The conductive network is strategically positioned to provide sensing functionality without compromising the mechanical flexibility of the entire structure.
Solution Approach 2:
The patent transitions from two-dimensional conductive patterns to three-dimensional conductive networks embedded within the porous elastomer volume. This 3D configuration allows the conductive material to distribute strain more effectively and maintain connectivity during deformation, achieving both sensitivity and stretchability.
3Adaptability or versatility
If conventional flexible electrodes are used, then elasticity is maintained, but electrical characteristic change according to tensile strain is insufficient for strain sensing
Solution Approach 1:
The patent designs the conductive network to dynamically respond to mechanical deformation, where the electrical resistance changes in real-time according to the applied strain. The conductive material configuration allows for reversible expansion and contraction, providing dynamic electrical characteristic changes that correlate with tensile strain for accurate sensing.
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 enables a strain sensor with improved stretchability and sensitivity, maintaining electrical characteristics over a wide range of reversible tensile strain and efficiently distributing tensile strain, suitable for applications in wearable devices and flexible electronic systems.
Implementation Method 1
The surface of the 3D nano-structured porous elastomer is wet by infiltrating a conductive solution in which a conductive material is dispersed
Implementation Method 2
A 3D percolated conductive nano-network coupled with the 3D nano-structured porous elastomer is formed by evaporating a solvent of the conductive solution
Data Source
AI summary
In a method of manufacturing a highly stretchable three-dimensional (3D) percolated conductive nano-network structure, a 3D nano-structured porous elastomer including patterns distributed in a periodic network is formed. A surface of the 3D nano-structured porous elastomer is changed to a hydrophilic state. A polymeric material is conformally adhered on the surface of the 3D nano-structured porous elastomer. The surface of the 3D nano-structured porous elastomer is wet by infiltrating a conductive solution in which a conductive material is dispersed. A 3D percolated conductive nano-network coupled with the 3D nano-structured porous elastomer is formed by evaporating a solvent of the conductive solution and removing the polymeric material.