Subsurface Carbon Foam Formation Using Dual Laser Ablation
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Solution Overview
Problem
Existing methods for producing carbon nanostructures, such as 3D graphene, result in materials that are brittle, poorly adhered to substrates, and limited in thickness, making them unsuitable for many applications.
Innovation Solution
A Dual Laser process is employed to convert a sub-surface region of a carbon precursor material to carbon foam, followed by ablating the disorganized non-graphene material above it, using two separate laser beams to create a carbon foam with unique properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a CO2 laser is used to produce 3D graphene on a substrate, then graphene can be formed at the surface, but the graphene is brittle, adheres poorly, and flakes off
Solution Approach 1:
The patent introduces an intermediary layer of disorganised carbon material between the substrate and the carbon foam. This intermediary layer acts as a bonding interface that adheres to both the substrate and the foam structure, preventing flaking while maintaining structural integrity. The intermediary layer is created by the same laser process but remains in a disorganised state rather than converting to graphene.
Solution Approach 2:
The patent applies different structural qualities to different regions: the core foam structure maintains its porous, expanded morphology for surface area, while the intermediary layer at the substrate interface maintains a disorganised, adherent structure for bonding. This local differentiation of material properties resolves the contradiction between adhesion and structural integrity.
2Area of stationary object
If laser irradiation is applied to produce carbon foam, then porous structure and surface area are improved, but the material above the foam remains disorganized and must be removed
Solution Approach 1:
The patent extracts and removes the disorganised carbon material layer that forms above the carbon foam during laser irradiation. This removal step isolates the desirable porous foam structure from the unwanted disorganised material, simplifying the final product while maintaining the high surface area benefits of the foam structure.
Solution Approach 2:
The patent utilizes the porous structure of carbon foam as the primary functional material, leveraging its high surface area for applications such as supercapacitors and biosensors. The porous morphology is preserved and exposed after removal of the overlying disorganised material, making the manufacturing process efficient despite the intermediate complexity.
3Length of stationary object
If the focus of the laser beam is moved through the carbon source to generate carbon foam, then thickness and volume can be controlled, but the surface material becomes disorganized
Solution Approach 1:
The patent performs preliminary laser irradiation to create the carbon foam structure at the desired thickness and volume by moving the focus through the carbon source. The disorganised surface layer that forms during this process is then removed in a subsequent step, allowing the foam's true morphology to be exposed without the deformations caused by surface carbonisation.
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
The resulting carbon foam is hydrophilic, highly porous, and has enhanced electron transfer rates, making it suitable for biosensors and supercapacitors with improved sensitivity and performance.
Implementation Method 1
using a first laser beam to irradiate an encapsulated or sub-surface region of a carbon pre-cursor material below a surface of the material
Implementation Method 2
parameters of the first laser beam being selected to create a carbon foam in that encapsulated or sub-surface region
Implementation Method 3
using a second laser beam to remove or ablate the disorganised, amorphous non-graphene material sitting above the carbon foam
Data Source
AI summary
A method of manufacturing a carbon nanostructure, such as a carbon foam material, is disclosed. The method comprises the steps of: (a) using a first laser beam to irradiate an encapsulated or sub-surface region of a carbon pre-cursor material below a surface of the material, to create carbon foam in that sub-surface region, and a disorganised, amorphous non-graphene material above the carbon foam, and then (b) using a second laser beam to remove or ablate the disorganised, amorphous non-graphene material sitting above the carbon foam, to expose at least some of the carbon foam. The resultant carbon foam material shows a significant D peak; the 2D peak is significantly less than the G peak; and the peak D: peak G ratio is significantly above zero. In appearance and Raman signature, it appears similar to a carbon nano-onion material. It can be used in biosensors, supercapacitors and pseudo-capacitors.