Porous Graphene Layer Formation via Localized Laser Graphitization
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Solution Overview
Problem
Current methods for manufacturing porous graphene layers on substrates face challenges such as brittleness and difficulty in transferring conductive graphene-like layers, which can lead to thermal damage of substrates during the process, and require additional processing steps that compromise the properties of the precursor material.
Innovation Solution
A method and apparatus that determine specific temperature thresholds and operating parameters for a light source to control the temperature of the substrate and precursor material layer, allowing for the formation of a porous graphene layer without thermal damage, using ultrafast laser pulses to achieve localized heating and prevent substrate damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high powered lasers are used to write conductive graphene layers, then manufacturing efficiency is improved, but thermal damage to substrate occurs
Solution Approach 1:
The patent applies local quality by concentrating laser energy precisely at the precursor material layer interface through controlled focal depth, ensuring that only the local region requiring graphitization receives high energy density while the surrounding substrate remains below thermal damage thresholds. This spatially differentiated energy distribution resolves the contradiction between manufacturing efficiency and substrate protection.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting laser operating parameters (power, pulse duration, scanning speed, focal depth) to maintain the substrate temperature below the damage threshold while achieving sufficient energy accumulation at the precursor material for effective graphitization. This parameter optimization enables high-speed processing without thermal damage.
2Ease of manufacture
If transfer methods are used for conductive graphene layers, then layer formation is achieved, but additional processing steps are required and useful properties of precursor material are lost
Solution Approach 1:
The patent extracts the graphitization process from the transfer method sequence by enabling direct writing of porous graphene layers onto the substrate through laser irradiation of the precursor material layer. This eliminates the need for separate transfer steps while maintaining the conductive layer formation capability, thereby reducing device complexity and preserving precursor material properties.
Solution Approach 2:
The precursor material layer serves itself by undergoing in-situ graphitization when exposed to laser energy, directly forming the conductive porous graphene layer on the substrate without requiring external transfer processes. This self-service mechanism simplifies manufacturing while preserving the useful properties of the original precursor material.
3Manufacturing precision
If rigid parametric conditions are applied for laser writing, then manufacturing precision is improved, but flexibility in processing different substrates is reduced
Solution Approach 1:
The patent applies dynamics by implementing adaptive control of laser parameters based on real-time feedback and material characteristics. The system dynamically adjusts power, pulse duration, and scanning speed to maintain optimal energy density for graphitization while accommodating variations in substrate thermal properties, thereby achieving both precision and flexibility across different substrate 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
This approach enables the direct writing of porous graphene layers on flexible substrates with minimal processing steps, maintaining the properties of the precursor material and preventing thermal damage, thus enhancing the manufacturing efficiency and reliability of flexible electronic devices.
Implementation Method 1
exposing the precursor material layer to the light source that is operating under the at least one of the operating parameters causes a temperature of the portion of the substrate adjoining a side of the precursor material layer to maintain below the second temperature threshold and a temperature of the opposite side of the precursor material layer to rise above the first temperature threshold
Implementation Method 2
a temperature of the portion of the substrate adjoining a side of the precursor material layer to maintain below the second temperature threshold
Implementation Method 3
first temperature threshold being a minimum temperature required for forming the porous graphene layer from a precursor material layer
Implementation Method 4
using ultrafast laser pulses to achieve localized heating and prevent substrate damage
Data Source
AI summary
The present disclosure provides a method and an apparatus for manufacturing a porous graphene layer across a precursor material layer on a substrate. The method comprises: determining a first temperature threshold and a second temperature threshold, the first temperature threshold being a minimum temperature required for forming the porous graphene layer from a precursor material layer on a portion of the substrate, the second temperature threshold being one at which the substrate is likely to experience thermal damages above this temperature threshold; determining at least one of operating parameters of a light source, wherein exposing the precursor material layer to the light source that is operating under the at least one of the operating parameters causes a temperature of the portion of the substrate adjoining a side of the precursor material layer to maintain below the second temperature threshold and a temperature of the opposite side of the precursor material layer to rise above the first temperature threshold; and generating an a beam of light from the light source to the precursor material layer based on the at least one of operating parameters of the light source to form the porous graphene layer.