Carbon Nanotube Array Transfer via Coating Layer Adhesion
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Solution Overview
Problem
Existing methods for transferring carbon nanotube arrays face challenges in efficiently transferring the arrays from a growing substrate to a substitute substrate while maintaining the structural integrity and alignment of the carbon nanotubes, which is crucial for their conductivity and transparency.
Innovation Solution
A method involving the use of a coating layer on the top ends of the carbon nanotubes and a substitute substrate with specific surface energy to increase the bonding force between the carbon nanotube array and the substitute substrate, allowing for the transfer of the array without damaging the van der Waals attractive forces that maintain the alignment and structure of the carbon nanotubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carbon nanotube array is transferred from growing substrate to substitute substrate, then the carbon nanotube film can be produced for various applications, but the structural integrity and alignment of carbon nanotubes may be damaged during transfer
Solution Approach 1:
The patent introduces a transfer substrate as an intermediary carrier between the growing substrate and the final application. The transfer substrate has specific surface properties that enable it to temporarily hold the carbon nanotube array during transfer, facilitating the separation from the growing substrate without damaging the nanotubes. This intermediary approach allows the carbon nanotube film to be produced while preserving its structural integrity and alignment.
2Strength
If coating layer is applied on top ends of carbon nanotubes to increase bonding force, then the bonding between carbon nanotube array and substitute substrate is improved, but the process complexity increases
Solution Approach 1:
The patent modifies the surface energy parameters of the substitute substrate to optimize bonding strength. By carefully selecting and controlling the surface energy of the substitute substrate, the patent achieves sufficient bonding force between the carbon nanotube array and the substrate without requiring additional coating layers. This parameter-based approach simplifies the overall process while maintaining strong bonding.
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 the successful transfer of carbon nanotube arrays to a substitute substrate while preserving their aligned structure and conductivity, allowing for the production of free-standing carbon nanotube films or wires with improved efficiency and reduced material costs by recycling the growing substrate.
Implementation Method 1
a coating layer on the top ends of the carbon nanotubes and a substitute substrate with specific surface energy to increase the bonding force between the carbon nanotube array and the substitute substrate
Implementation Method 2
without damaging the van der Waals attractive forces that maintain the alignment and structure of the carbon nanotubes
Data Source
AI summary
A method for transferring a carbon nanotube array is disclosed. The carbon nanotube array has an ability to have a carbon nanotube structure drawn therefrom. The carbon nanotube array is transferred from a growing substrate to a substitute substrate, meanwhile the carbon nanotube array is still configured for drawing the carbon nanotube structure from the substitute substrate. A coating layer is formed on a top end of a carbon nanotube in the carbon nanotube array. The top end is away from the growing substrate. The substitute substrate is placed on the carbon nanotube array and contacted with the coating layer. Thereby the substitute substrate is combined with the carbon nanotube array by the coating layer. The substitute substrate is separated from the growing substrate. Thereby the carbon nanotube array is separated from the growing substrate. A method for making a carbon nanotube structure is also disclosed.