Carbon Nanostructure Growth via Catalyst Separation
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Solution Overview
Problem
Conventional methods for manufacturing carbon nanostructures often result in bends, which affect their properties, such as electrical resistance, and applying tension to the growing nanostructures is challenging due to their fine nature.
Innovation Solution
A method involving a base body with a catalyst and separation member, where at least a part of the contact portion is oxidized, and a carbon-containing source gas is introduced while separating the members, allowing the carbon nanostructure to grow in the separation interface region, reducing deformation like bends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a carbon-containing source gas is supplied to a heated fine catalyst to grow a carbon nanostructure, then the carbon nanostructure can be manufactured, but a bend occurs in the carbon nanostructure causing local property changes
Solution Approach 1:
The invention divides the catalyst into a catalyst member and a separation member that are separated during the carbon nanostructure growth process. This segmentation creates a separation interface region where the carbon nanostructure grows under tension, preventing bends while maintaining manufacturability.
Solution Approach 2:
The invention performs preliminary oxidation of the contact portion between the catalyst member and separation member before introducing the carbon-containing source gas. This preliminary action prepares the surface to promote straight carbon nanostructure growth and prevent bending during the subsequent growth process.
2Manufacturing precision
If tension is applied to the carbon nanostructure during growth to reduce bends, then the straightness improves, but it becomes difficult to chuck the tip of the fine carbon nanostructure
Solution Approach 1:
The invention introduces a separation member as an intermediary element that applies tension to the carbon nanostructure during growth without requiring direct manipulation of the nanostructure itself. The separation member acts as a mediator that maintains tension while allowing the fine nanostructure to grow freely, solving both the straightness problem and the handling difficulty.
3Stability of the object's composition
If the catalyst member and separation member are kept in contact during growth, then the structure is stable, but the carbon nanostructure grows with deformation
Solution Approach 1:
The invention transitions from a static contact state between the catalyst member and separation member to a dynamic separated state during the carbon nanostructure growth process. The members are separated to allow tension application and prevent deformation, while the base body remains stable through the controlled separation mechanism.
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 efficient growth of carbon nanostructures with reduced bends, maintaining tension and improving their properties, such as electrical resistance, by growing them in the separation interface region between the catalyst and separation members.
Implementation Method 1
oxidizing at least a part of a contact portion or integral portion of the catalyst member and the separation member in the base body
Implementation Method 2
by heating the base body while separating the separation member from the catalyst member
Implementation Method 3
bringing a carbon-containing source gas into contact with the catalyst member and/or the separation member
Data Source
AI summary
There is provided a method for manufacturing a carbon nanostructure with reduced occurrence of a bend and the like. The method for manufacturing a carbon nanostructure according to the present invention includes the steps of: preparing a base body formed of a catalyst member including a catalyst and a separation member that are in contact with or integral with each other (preparation step); oxidizing at least a part of a contact portion or integral portion of the catalyst member and the separation member (oxidation step); bringing a carbon-containing source gas into contact with the catalyst member and/or the separation member (CNT growth step); and growing a carbon nanostructure (CNT growth step). In the CNT growth step, the carbon nanostructure is grown in a separation interface region between the catalyst member and the separation member, by heating the base body while separating the separation member from the catalyst member.