Nanowire Patterning Paste for Precise Cutting Without Isolation
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Solution Overview
Problem
Current methods for patterning silver nanowire films are time-consuming due to the need for complex processes involving printing, selective removal, and etching, which can lead to unwanted electrical isolation and visibility issues.
Innovation Solution
A patterning paste containing guanidine thiocyanate is used to selectively cut metal nanowires by degrading them, allowing for precise patterning without complete reaction, thereby maintaining electrical isolation and minimizing visual impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex patterning layers are printed, selectively removed, and etched, then metal nanowires can be patterned, but processing time increases significantly
Solution Approach 1:
The invention extracts and eliminates the complex multi-step patterning process (printing, selective removal, etching) by using a direct chemical etching approach with guanidine thiocyanate solution that patterns metal nanowires in a single step, thereby removing unnecessary process steps and reducing processing time
Solution Approach 2:
Instead of building patterns by adding and selectively removing materials, the invention inverts the approach by directly etching away unwanted metal nanowire regions using guanidine thiocyanate, achieving patterns through selective removal rather than selective retention
2Manufacturing precision
If traditional etching methods are used, then metal nanowires can be cut, but unwanted electrical isolation occurs
Solution Approach 1:
The invention changes the chemical parameters by using guanidine thiocyanate at specific concentrations (0.1-10 M) and controlled exposure times, which allows precise control over the etching depth and extent, cutting metal nanowires cleanly without creating unwanted electrical isolation between adjacent structures
Solution Approach 2:
The etching process applies selective chemical action only to specific regions where metal nanowires need to be cut, maintaining local precision and avoiding widespread electrical isolation by controlling the spatial distribution of the guanidine thiocyanate solution application
3Productivity
If complete reaction is used for patterning, then metal nanowires are fully degraded, but visual appearance and electrical integrity are compromised
Solution Approach 1:
The invention applies partial action by using controlled, limited exposure to guanidine thiocyanate solution that degrades metal nanowires only to the extent needed for patterning, stopping before complete degradation occurs, thereby maintaining electrical integrity and visual appearance while achieving effective patterning
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 use of guanidine thiocyanate in the patterning paste enables efficient and precise cutting of metal nanowires, reducing processing time and avoiding unwanted electrical isolation, while maintaining the substrate's appearance and electrical integrity.
Implementation Method 1
the complexing agent creating a ligand/lixivant where it contacts the metal nanowires, which can then be washed from the substrate
Implementation Method 2
the metal nanowires are selectively cut into a pattern
Data Source
AI summary
A patterning paste is disclosed for patterning metal nanowires, the patterning paste including a complexing agent containing guanidine thiocyanate. A method of selectively patterning a substrate having metal nanowires includes: providing a substrate having a surface bearing metal nanowires; and selectively applying the patterning paste to the substrate such that the metal nanowires are selectively cut into a pattern. A consumer electronic product includes: a substrate having a surface bearing metal nanowires. The metal nanowires of the substrate are selectively patterned by applying the patterning paste to the substrate such that the metal nanowires are selectively cut into the pattern.