Sub-Surface Carbon Foam Formation for Thick Adherent Nanostructures
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Solution Overview
Problem
Conventional methods for producing 3D graphene are limited by the material's brittleness, poor adhesion to substrates, and restricted thickness, making it unsuitable for many applications, and existing carbon nanostructures lack the desired properties for advanced technologies like biosensors and supercapacitors.
Innovation Solution
A Dual Laser process is employed to create carbon foam by irradiating a sub-surface region of a carbon precursor material with a focused laser beam, followed by ablation of the disorganized non-graphene material above, resulting in a hydrophilic, turbostratic twisted multilayer carbon foam with enhanced properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional laser induced graphene production is used, then 3D graphene forms at the surface of the carbon pre-cursor material, but the thickness is limited to less than 50 μm and the material is brittle with poor adhesion to substrate
Solution Approach 1:
Instead of forming graphene at the surface as in conventional methods, this invention inverts the approach by forming carbon foam in the sub-surface region below the surface. The first laser beam irradiates the sub-surface region to create carbon foam, and the second laser beam removes the surface material to expose the carbon foam. This inversion resolves the contradiction by achieving greater thickness while maintaining substrate adhesion through the underlying disorganised material layer.
Solution Approach 2:
The invention transitions from surface-level graphene formation to sub-surface carbon foam formation, effectively moving the carbonization process to another dimension (below the surface). This allows the carbon foam to extend deeper into the pre-cursor material, achieving thickness greater than 50 μm while the disorganised material layer provides anchoring to the substrate.
2Reliability
If conventional laser induced graphene production is used, then 3D graphene forms, but it is brittle and may flake off the substrate
Solution Approach 1:
The invention creates a composite structure consisting of carbon foam in the sub-surface region and disorganised material in the surface region. This composite structure combines the benefits of carbon foam (greater thickness, porosity) with the adhesion properties of the disorganised material layer that remains bonded to the substrate, preventing flaking and improving structural stability.
3Adaptability or versatility
If conventional graphene production is used, then graphene forms at the surface, but it is hydrophobic with low wettability unsuitable for biosensors and supercapacitors
Solution Approach 1:
The invention changes the physical and chemical parameters of the carbon material by forming carbon foam in the sub-surface region rather than surface graphene. This parameter change transforms the material from hydrophobic surface graphene to hydrophilic carbon foam with enhanced wettability, making it suitable for biosensor and supercapacitor 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
The process produces carbon foam with improved wettability, anti-fouling properties, and increased surface area, suitable for advanced applications such as biosensors and supercapacitors, offering better sensitivity, reproducibility, and performance compared to conventional graphene.
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, to create carbon foam in that sub-surface region
Implementation Method 2
irradiating with a CO2 laser, then 3D graphene forms at the surface of the exposed polyimide film
Implementation Method 3
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
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.