Lignin-Based Laser Lithography for 3D Graphene Electrodes
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Solution Overview
Problem
Existing methods for fabricating micro-supercapacitors and other devices using graphene electrodes are limited by complex processes, selective growth constraints, and difficulty in removing unreacted polyamide materials, with a need for a sustainable and cost-effective approach that allows for selective growth of graphene layers.
Innovation Solution
A lignin-based laser lithography process involving a lignin-polymer composite film, where a water-soluble alkaline lignin, a polymer with bonding properties, and a solvent are used to create a graphene pattern through laser scribing and subsequent water lift-off, enabling the formation of 3D porous graphene electrodes on various substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex photo-lithography techniques are used to fabricate MSCs, then manufacturing precision is improved, but device complexity increases and ease of manufacture deteriorates
Solution Approach 1:
The patent extracts and eliminates the photolithography mask step from the fabrication process by using laser scribing technology to directly write electrode patterns onto the substrate, thereby simplifying the overall device complexity while maintaining manufacturing precision
Solution Approach 2:
The patent replaces the mechanical photolithography mask alignment and exposure system with a laser-based direct writing system, substituting complex mechanical-optical systems with a more straightforward laser scribing approach that achieves comparable precision with reduced complexity
2Ease of manufacture
If laser scribing technology is used to transform GO to rGO, then ease of manufacture is improved, but loss of time increases due to complicated GO preparation
Solution Approach 1:
The patent applies preliminary action by pre-coating the substrate with a lignin-based material before laser scribing, so that the laser process can directly create the final graphene electrode structure without requiring prior GO preparation steps, thereby eliminating time-consuming GO synthesis while maintaining fabrication simplicity
Solution Approach 2:
Instead of the conventional approach of first preparing GO and then reducing it to rGO through laser scribing, the patent inverts the process by using lignin as a direct carbon source that transforms into graphene-like structures through laser irradiation, eliminating the need for GO preparation entirely
3Ease of manufacture
If polyimide is used as substrate for laser scribing, then ease of manufacture is improved, but difficulty of detecting and measuring increases due to inability to easily remove unreacted polyamide
Solution Approach 1:
The patent changes the chemical parameters of the substrate material from polyimide to lignin-based materials that exhibit different solubility characteristics, allowing the unreacted material to be easily removed by water or common solvents while maintaining the ease of laser scribing fabrication
Solution Approach 2:
The patent enables easy discarding of unreacted lignin-based material through water solubility or solvent dissolution, allowing clean removal of excess material after laser scribing without requiring complex chemical etching or mechanical removal processes
4Ease of manufacture
If existing laser scribing methods are used on limited polymers, then ease of manufacture is improved, but adaptability deteriorates due to limited substrate selection
Solution Approach 1:
The patent achieves universality by developing a lignin-based material system that can be processed by laser scribing and applied to multiple substrate types including flexible polymers, rigid substrates, and various geometries, thereby expanding adaptability while maintaining fabrication simplicity
Solution Approach 2:
The patent uses composite materials approach by combining lignin with various polymers and substrates to create versatile material systems that maintain ease of laser processing while adapting to different substrate requirements and applications
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 method allows for the scalable, cost-effective production of high-quality graphene electrodes with improved conductivity and porosity, facilitating the fabrication of micro-supercapacitors and other devices with enhanced performance and sustainability.
Implementation Method 1
exposing a first part of the coated lignin-polymer composite film to a laser beam for transforming the first part into the graphene pattern
Implementation Method 2
the laser scribing carbonization of polyimide provides LSG with highly porous structure and high conductivity
Implementation Method 3
removing a second part of the coated lignin-polymer composite film, which was not exposed to the laser beam, by placing the second part in water
Data Source
AI summary
There is a method for forming a three dimensional or porous graphene electrode pattern on a substrate, the method including providing a substrate; coating the substrate with a lignin-polymer composite film; exposing a first part of the coated lignin-polymer composite film to a laser beam for transforming the first part into the graphene pattern; and removing a second part of the coated lignin-polymer composite film, which was not exposed to the laser beam, by placing the second part in water. The lignin-polymer composite film includes (1) a water-soluble alkaline lignin, (2) a polymer having bonding properties, and (3) a solvent, and an amount of the water-soluble alkaline lignin in the lignin-polymer composite film is between 5 and 60% by weight.