Silver Nanowire Conductive Inks Room Temperature Curing
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Solution Overview
Problem
Current electrically conductive materials, such as metal-loaded polymers, face challenges in achieving high electrical conductivity while maintaining desirable properties like flexibility and processability, particularly with high metal loadings, and often require heating to achieve low resistivities.
Innovation Solution
A flowable precursor composition comprising silver nanowires and other metal particulates, such as silver flakes, with a high metal weight percentage, combined with a reducible metal composition, which forms a solid polymer matrix upon curing, reducing resistivity and enhancing conductivity without the need for high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high metal loading is used to achieve high electrical conductivity, then electrical conductivity is improved, but flexibility and processability deteriorate
Solution Approach 1:
The invention uses composite materials combining silver nanowires with polymer matrices (such as UV-curable resins, epoxies, or acrylics) to create electrically conductive compositions. The nanowire network within the polymer composite provides electrical conductivity pathways while the polymer binder maintains flexibility and enables processing. This composite structure allows achieving low resistivity (high conductivity) without sacrificing the mechanical flexibility and processability that pure metal loadings would compromise.
2Reliability
If heating is applied to achieve low resistivity, then electrical conductivity is improved, but energy consumption and processing complexity increase
Solution Approach 1:
The invention replaces thermal processing (heating) with UV irradiation or alternative curing methods to achieve low resistivity. The UV-curable polymer matrix allows the nanowire network to be activated and bonded at room temperature through photochemical reactions, eliminating the need for high-temperature heating processes. This substitution significantly reduces energy consumption while achieving the same electrical conductivity improvement, as the UV energy directly initiates polymerization and nanowire integration without requiring bulk heating of the material.
3Reliability
If high metal loading is used to achieve high electrical conductivity, then electrical conductivity is improved, but material cost and environmental impact increase
Solution Approach 1:
The invention changes the physical parameters of the metal component from conventional metal particles or flakes to silver nanowires with specific dimensions (diameter 1-100 nm, length 1-100 μm, aspect ratio 10-10000). This parameter change in morphology allows achieving effective percolation networks at much lower metal loadings compared to traditional particulate metals. The high aspect ratio and small diameter of nanowires create efficient conductive pathways with minimal material, reducing both cost and environmental impact while maintaining high electrical conductivity.
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 composition achieves very low resistivities, suitable for high-performance applications, with improved electrical conductivity and flexibility, and can be processed at room temperature, reducing material usage and environmental impact.
Implementation Method 1
a reducible metal composition such as one or more silver salts
Data Source
AI summary
Concentrated flowable compositions having a total metal weight of at least about 45 wt % are used to form an electrically conductive material. The compositions include metal particulates such as silver flakes, silver particles and/or silver nanowires, and for embodiments of particular interest, a reducible metal composition such as one or more silver salts. The composition includes an organic precursor that forms a polymeric matrix and includes a dissolved polymer binder, a crosslinkable or polymerizable monomer, oligomer or polymer, or a mixture thereof. The flowable precursor composition can be used to form an electrically conductive structure such as a composite of solid polymer matrix and at least about 45 wt % metal. The composite can have a resistivity of no more than about 5×10−3 Ohm-cm. Methods for forming the flowable precursor composition and the composites are described.