Dye-Based Laser-Induced Graphene Scribing on Complex Surfaces
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Solution Overview
Problem
Current methods for scribing laser-induced graphene (LIG) are limited by the need for high-performance polymer precursors that are expensive, require processing in sheet form, and are difficult to apply to non-flat or non-smooth surfaces, and involve chemical compatibility issues with substrates.
Innovation Solution
Using dyes dispersed or dissolved in a solvent or dispersing medium as carbonization precursors, applied via methods like spray coating or screen printing, allowing LIG to be directly coated on any wettable surface and transformed into conductive tracks through laser-induced pyrolysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-performance polymer precursors (such as polyimide) are used for LIG scribing, then the electrical and thermal properties of the resulting graphene are improved, but the cost of the precursor material increases significantly
Solution Approach 1:
The patent replaces expensive high-performance polymers with inexpensive dyes that can be used as single-use precursors. The dyes are applied as coatings that are subsequently removed after laser processing, eliminating the need for costly reusable polymer substrates while maintaining graphene quality.
Solution Approach 2:
The patent extracts only the essential carbon-source function from expensive polymers and implements it through simple, cheap dyes. The dye molecules provide the necessary carbon for graphene formation without requiring the complex structural properties of high-performance polymers.
2Stability of the object's composition
If polymer precursors are processed in sheet form, then the structural integrity and uniformity of LIG are improved, but the adaptability to complex surface geometries deteriorates
Solution Approach 1:
The patent uses flexible dye coatings applied as thin films that can conform to complex surface geometries. These coatings maintain sufficient structural integrity during laser processing while adapting to various surface shapes, unlike rigid polymer sheets.
Solution Approach 2:
The patent employs spray coating techniques (aerosol delivery) to apply dye precursors as mist or liquid that can penetrate and coat complex surface geometries uniformly, then dries to form intact thin films ready for laser processing.
3Ease of operation
If polymer precursors are applied as coatings, then the ease of application to substrates is improved, but the chemical compatibility issues with different substrates increase
Solution Approach 1:
The patent develops universal dye-based precursor coatings that can be applied to diverse substrates without chemical compatibility issues. The dyes are formulated to be chemically inert toward various substrate materials while providing consistent graphene formation across different surface types.
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
Enables LIG application on diverse substrates with improved chemical compatibility and cost-effectiveness, using commercially available and inexpensive dyes, and allows for scribing on complex surfaces with standard laser equipment.
Implementation Method 1
exposing the pure dye or the dye solution or the dye dispersion to the laser... transformed into conductive LIG tracks through laser-induced pyrolysis
Implementation Method 2
appropriate exposure to laser scribing at suitable wavelength and with suitable laser fluence
Data Source
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AI summary
The present invention relates to a method of scribing laser-induced graphene (LIG) comprising the steps of: coating or soaking a substrate material with at least one pure dye or a dye dispersion or a dye solution; setting at least one laser parameter for laser-induced pyrolysis; and exposing the dye to the laser.