Core-Shell Nanowire Electrodes Without Vacuum TCE Processing
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Solution Overview
Problem
Current methods for manufacturing high-performance metal nanowire networks for transparent conducting electrodes (TCEs) are limited by the need for expensive catalysts and vacuum processing, which are not scalable for manufacturing.
Innovation Solution
A method involving the deposition of an ink as a liquid strand onto a substrate, transforming it into a precursor strand, and then converting it into a core-shell nanowire with electrospinning and electroless plating, allowing for the production of scalable and cost-effective TCEs with tunable transmission and sheet resistance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vacuum processing and expensive metal catalysts (palladium or platinum) are used to manufacture metal nanowire networks, then high performance TCEs are achieved, but manufacturing cost increases and scalability is limited
Solution Approach 1:
The patent replaces expensive precious metal catalysts (palladium or platinum) with inexpensive copper catalysts for nanowire synthesis. The copper catalysts perform their catalytic function during nanowire growth and can be removed afterward, leaving high-performance metal nanowire networks without requiring costly rare metals. This substitution dramatically reduces material costs while maintaining TCE performance.
Solution Approach 2:
The patent replaces vacuum processing equipment with solution-based processing methods. Instead of using complex vacuum deposition systems, the invention employs liquid precursor solutions that can be deposited using simple spin-coating or dip-coating techniques. The nanowire networks are formed through chemical reduction processes in solution, eliminating the need for expensive vacuum equipment and enabling scalable manufacturing.
2Reliability
If vacuum processing equipment is used for nanowire network fabrication, then high performance TCEs are produced, but manufacturing complexity and equipment cost increase
Solution Approach 1:
The patent replaces complex vacuum processing equipment with simple solution-based processing. Liquid precursor solutions containing metal salts and polymers are deposited onto substrates using spin-coating or dip-coating, followed by thermal annealing to form nanowire networks. This substitution eliminates the need for expensive vacuum deposition systems, particle generators, and complex control systems, while achieving comparable or superior TCE performance through solution chemistry.
Solution Approach 2:
The patent introduces liquid precursor solutions as intermediaries between the metal catalysts and the final nanowire network. These solutions contain dissolved metal salts and polymer precursors that serve as carriers, enabling the metal atoms to be deposited uniformly onto substrates and transformed into nanowire networks through controlled thermal or chemical reduction. This intermediary approach simplifies the manufacturing process compared to direct vacuum deposition of metal atoms.
3Reliability
If expensive precious metal catalysts are used for nanowire synthesis, then high performance TCEs are achieved, but production cost increases
Solution Approach 1:
The patent substitutes expensive precious metal catalysts with inexpensive copper-based catalysts for nanowire synthesis. The copper catalysts perform their catalytic function during the nanowire growth process and are subsequently removed, leaving pure metal nanowire networks. This replacement reduces catalyst material costs by orders of magnitude while maintaining the structural integrity and electrical performance of the TCEs.
Solution Approach 2:
The patent employs a catalyst removal step after nanowire synthesis to eliminate the copper catalysts from the final product. The copper catalysts serve their purpose during nanowire formation and are then discarded through chemical etching or thermal decomposition, leaving clean metal nanowire networks. This approach allows the use of inexpensive sacrificial catalysts that can be completely removed, avoiding the need to use expensive precious metals in the final TCE structure.
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
This approach results in state-of-the-art TCEs with a Haacke figure of merit of 652×10−3·Ω−1 and 86% visible light transmittance, demonstrating improved performance and scalability while reducing production costs.
Implementation Method 1
depositing an ink as a liquid strand onto a substrate, transforming the liquid strand to a precursor strand
Implementation Method 2
the converting may include exposing a surface of the precursor strand to at least one of ultraviolet light, ozone, and/or plasma
Implementation Method 3
the precursor strand may be exposed to hydrogen gas and the hydrogen gas may reduce the polymer and/or the silver salt
Implementation Method 4
the coating may include electroless plating of the second metal onto the nanowire
Data Source
AI summary
An aspect of the present disclosure is a method that includes depositing an ink as a liquid strand onto a substrate, transforming the liquid strand to a precursor strand, converting at least a portion of the precursor strand to a nanowire that includes a first metal, and coating the nanowire with a second metal to form a core-shell nanowire having a core and a shell, where at least a portion of the transforming occurs during the depositing, and the core includes the nanowire and the shell includes the second metal.