Metal Nanowire Conductive Composition for Low Haze Touch Panels
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Solution Overview
Problem
Conductive materials like ITO face challenges such as indium scarcity, high haze values, insufficient heat resistance, and lack of flexibility, while metal nanowires offer transparency and low resistance but suffer from high haze and resistance issues unless coated, necessitating a solution for improved conductive layers in touch panels and solar cells.
Innovation Solution
A conductive composition comprising metal nanowires with an average minor axis length of 1 nm to 150 nm, combined with a monosaccharide or its derivative, such as glucose, in a specific concentration, to produce a conductive layer with reduced haze and enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If metal nanowire is used as conductive material, then transparency and low resistance are improved, but haze value increases due to wire structure
Solution Approach 1:
The patent applies parameter changes by controlling the average minor axis length of metal nanowires to be 1 nm to 150 nm, and precisely controlling the monosaccharide content to 0.005% to 0.05% by mass. This optimization of physical parameters reduces light scattering while maintaining conductivity, thereby reducing haze value while preserving transparency.
Solution Approach 2:
The patent creates a composite material system combining metal nanowires with monosaccharide compounds. The monosaccharide acts as a coating or dispersant on the nanowire surface, modifying the optical properties of the composite while maintaining electrical conductivity. This composite approach allows simultaneous achievement of low haze and high transparency.
2Reliability
If metal nanowire is used to reduce resistance, then conductivity is improved, but heat resistance becomes insufficient due to high specific surface area
Solution Approach 1:
The patent forms a composite structure where monosaccharide compounds are present on the metal nanowire surface. This composite material provides thermal protection to the nanowires, improving heat resistance while the metal nanowire core maintains electrical conductivity. The monosaccharide layer acts as a thermal barrier.
Solution Approach 2:
The monosaccharide compound serves as an intermediary layer between the metal nanowire and the environment. This intermediary provides thermal protection to the nanowire, preventing direct thermal damage while allowing electrical conduction through the nanowire structure.
3Quantity of substance
If ultrafiltration is used to eliminate impurities, then purity is improved, but haze characteristics are not sufficiently improved
Solution Approach 1:
The patent changes the approach from simple filtration to precise compositional control. By controlling the monosaccharide content to 0.005% to 0.05% by mass and nanowire diameter to 1 nm to 150 nm, the patent achieves low haze through optimized material parameters rather than just impurity removal. The monosaccharide itself becomes a functional component rather than an impurity.
Solution Approach 2:
The patent converts what would normally be considered impurities (monosaccharide compounds) into beneficial functional components. Instead of completely removing all non-metallic substances through ultrafiltration, the patent retains controlled amounts of monosaccharide that actually improve the optical properties by reducing haze, thereby turning a potential harm into a benefit.
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 provides a conductive layer with low haze, improved durability, and reduced surface resistance, suitable for touch panels and solar cells, while maintaining transparency and conductivity.
Implementation Method 1
metal nanowire in place of ITO... excellent low resistance
Implementation Method 2
an improvement in haze characteristics is one important problem... capable of providing a conductive layer having a low haze
Data Source
AI summary
A conductive composition includes: a) metal conductive fibers having an average minor axis length of from 1 nm to 150 nm; and b) at least one compound selected from the group consisting of a monosaccharide and a derivative thereof, in an amount of from 0.005% by mass to 0.05% by mass with respect to the metal conductive fibers.