Metal-Embedded Textile Conductive Ink for Stretchable Conductivity
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Solution Overview
Problem
Conductive textiles face challenges in maintaining conductivity during dynamic stretching and straining due to brittle metal layers and poor conductivity from surface-deposited metal particles, which limits their mechanical and stretchable properties, making them unsuitable for commercial applications.
Innovation Solution
The development of metal complex conductive ink compositions that penetrate and embed metal into textile substrates, such as polyester, nylon, and cotton, creating a conductive pathway below the surface, allowing for high conductivity and flexibility by using particle-free inks like silver, copper, gold, and palladium, which are cured at low temperatures to avoid damaging heat-sensitive materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal conductive layer is deposited on top of the fiber or fabric surface, then conductivity is achieved, but the material becomes brittle and cannot stretch/strain
Solution Approach 1:
The metal ions are embedded within the polymer matrix of the fiber, with the conductive metal nanoparticles nested inside the polymer structure. This nested configuration allows the conductive pathway to be integrated within the fiber rather than applied on the surface, enabling both conductivity and stretchability as the fiber can deform without fracturing the embedded metal structure.
Solution Approach 2:
The invention creates a composite material where metal ions are combined with polymer materials to form an intrinsically conductive fiber. The composite structure integrates the conductive properties of metal with the mechanical flexibility of polymer, resulting in a material that exhibits both electrical conductivity and elastic stretchability.
2Reliability
If a metal layer is sputtered onto the fabric, then conductivity is achieved, but the process is expensive and has low throughput
Solution Approach 1:
The invention replaces the mechanical sputtering process with a chemical solution-based approach where metal ions are incorporated into the polymer matrix through solution processing. This substitution of mechanical deposition with chemical infiltration enables simpler, more scalable manufacturing processes such as dyeing or coating, significantly improving throughput and reducing costs.
3Ease of manufacture
If metal particles are deposited on the fabric surface, then conductivity is achieved at lower cost, but conductivity is poor due to low curing temperature
Solution Approach 1:
The invention changes the fundamental parameter of metal incorporation from surface deposition to bulk embedding. By incorporating metal ions within the polymer matrix rather than depositing particles on the surface, the conductive pathways are formed throughout the material bulk, achieving superior conductivity that does not depend on high curing temperatures or surface particle alignment.
4Ease of manufacture
If the metal coating is applied on the surface, then the material can be manufactured, but it peels or fractures during mechanical strain resulting in increased electrical resistance
Solution Approach 1:
The metal ions are incorporated into the polymer matrix during the fiber formation or coating process, before the final product is manufactured. This preliminary embedding ensures that the conductive pathways are established within the material structure itself, so when mechanical strain occurs, the conductive network deforms with the material rather than peeling or fracturing, maintaining electrical resistance stability.
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 resulting conductive materials exhibit low electrical resistance even after significant stretching, maintaining performance for multiple cycles, and possess antimicrobial properties due to the release of metal ions, addressing the limitations of existing conductive fabrics.
Implementation Method 1
metal complex conductive ink compositions that penetrate and embed metal into textile substrates
Implementation Method 2
the release of metal ions
Data Source
AI summary
This disclosure provides electrically conductive materials, including electrically conductive textile materials, such as woven or knitted fabric textiles, individual fibers, and woven fibers and yarns. The conductive materials comprise a substrate material, such as a textile or other suitable material, and a metal embedded in the substrate material, in particular where the metal is embedded into and below the surface of the material. Also provided are methods of making the electrically conductive materials.