Metal Nanowire Heater Patterning With Thermal Joining
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Metal nanowire heaters face challenges with low heating characteristics at the same voltage due to high resistance, susceptibility to oxidation, and limited flexibility, as well as high process costs for substrate-specific fabrication and patterning.
Innovation Solution
A method involving the use of laser-etchable low-melting-point metal nanowires coated on flexible substrates with an ionic liquid and heat application for thermal joining, combined with a patterning process using a short-wavelength laser and an overcoating layer for enhanced durability and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If metal nanowires are used as heating element material, then flexibility and transmittance are improved, but resistance increases and heating characteristics deteriorate
Solution Approach 1:
The patent changes the physical and chemical parameters of metal nanowires through surface treatment, alloying, and structural modification to reduce resistance while maintaining flexibility. Specific parameters adjusted include surface roughness, composition ratios, and wire diameter to optimize both flexibility and heating performance.
Solution Approach 2:
The patent creates composite structures by combining metal nanowires with conductive polymers, metal oxides, or other materials to form hybrid heating elements. This composite approach reduces overall resistance while preserving the flexibility advantages of nanowire structures.
2Adaptability or versatility
If metal nanowires are used as heating element material, then flexibility is improved, but oxidation resistance deteriorates
Solution Approach 1:
The patent converts the harmful oxidation effect into a beneficial protective mechanism by applying controlled oxidation treatments that form protective oxide layers on the nanowire surfaces. These layers prevent further oxidation while maintaining electrical conductivity and flexibility.
Solution Approach 2:
The patent employs inert atmosphere processing during fabrication and operation to prevent oxidation. This includes using nitrogen or argon environments during deposition and creating encapsulation structures that maintain inert conditions during device operation.
3Adaptability or versatility
If metal nanowires are used as heating element material, then flexibility is improved, but heat resistance deteriorates
Solution Approach 1:
The patent applies flexible protective thin film coatings on metal nanowires to provide thermal protection while maintaining flexibility. These coatings act as thermal barriers that prevent wire degradation at high temperatures while allowing the structure to remain flexible and bendable.
Solution Approach 2:
The patent creates composite structures with high-temperature resistant materials combined with flexible nanowires. This includes coating nanowires with heat-resistant ceramics or polymers that maintain structural integrity at elevated temperatures while preserving the flexible nature of the heating element.
4Manufacturing precision
If photolithography process is used for patterning, then manufacturing precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the complex photolithography mechanical system with simpler direct writing methods such as laser writing, inkjet printing, or robotic manipulation. These methods achieve comparable patterning precision without requiring cleanroom facilities, photomasks, and multiple development steps.
Solution Approach 2:
The patent employs self-aligned patterning methods where the heating element pattern automatically aligns with substrate features or where subsequent layers self-align to previous layers without requiring additional alignment steps. This reduces process complexity while maintaining manufacturing precision.
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 reduces the resistance of metal nanowire heaters, improves heating characteristics at lower voltages, enhances durability and flexibility, and allows for cost-effective, substrate-independent fabrication with high transmittance and heat resistance, enabling flexible and complex pattern designs.
Implementation Method 1
a thermal joining step of enhancing connection between contact parts of the metal nanowires due to a chemical and physical action occurring when an ionic liquid is phase-changed, by supplying the ionic liquid onto the coating film and applying heat from outside
Implementation Method 2
a thermal joining step of enhancing connection between contact parts of the metal nanowires due to a chemical and physical action occurring when an ionic liquid is phase-changed
Implementation Method 3
Transparent heaters have transparency and have heating characteristics based on joule heating
Implementation Method 4
a patterning process using a short-wavelength laser
Data Source
AI summary
Provided is a metal nanowire heater and a method of fabricating the metal nanowire heater that includes providing a substrate; coating on the substrate a nanowire film containing metal nanowires that are laser-etchable; thermally joining portions of the metal nanowires to enhance connection between contact parts of the metal nanowires and provide an enhanced nanowire film by at least one unit cycle of supplying the ionic liquid onto the nanowire film and applying heat from outside to cause the ionic liquid to change its phase; and forming electrodes on the enhanced nanowire film to provide the metal nanowire heater.