Reverse-Tapered Collecting Filter for Stable CNT Film Resistance
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Solution Overview
Problem
Conventional methods for producing transparent conducting films with carbon nanotubes (CNTs) face challenges in achieving low resistance due to fluctuations in internal pressure and synthesis conditions, leading to unstable CNT quality and resistance variations.
Innovation Solution
A collecting filter with a porous structure and a dense film having a reverse tapered opening, where the first width at the inlet is smaller than the second width at the bottom, is used to stabilize the internal pressure and synthesis conditions, allowing for the efficient collection and transfer of CNTs to a transparent substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional filtering methods are used to collect CNTs, then the CNTs can be transferred to a transparent substrate, but the internal pressure and synthesis conditions fluctuate, leading to unstable CNT quality and resistance variations
Solution Approach 1:
The patent changes the geometric parameters of the opening in the dense film, specifically creating a reverse tapered shape where the width increases from the inlet toward the bottom. This parameter change stabilizes the internal pressure and synthesis conditions during CNT collection, eliminating the pressure fluctuations that cause quality variations.
Solution Approach 2:
The dense film is designed with non-uniform opening geometry, where the reverse tapered shape creates different local conditions at different positions. The narrowing toward the inlet and widening toward the bottom creates localized pressure distribution that stabilizes the overall synthesis environment, improving CNT quality consistency.
2Productivity
If a dense film with opening is used to collect CNTs, then CNTs can be efficiently filtered, but the opening shape affects pressure stability and CNT quality
Solution Approach 1:
By changing the geometric parameters of the opening from a conventional shape to a reverse tapered shape, the patent achieves both efficient CNT collection and precise resistance control. The specific width variation profile stabilizes synthesis conditions while maintaining high collection efficiency.
Solution Approach 2:
The reverse tapered opening introduces asymmetric geometry in the dense film structure. This asymmetry, with the wider portion at the bottom and narrower at the inlet, creates optimized flow dynamics that simultaneously improve collection efficiency and resistance control precision.
3Device complexity
If the opening width is uniform, then the structure is simple, but the internal pressure fluctuates and CNT quality becomes unstable
Solution Approach 1:
The patent modifies the opening width parameter along the depth direction, creating a reverse tapered profile. This parameter variation, while increasing structural complexity, is minimal and achieves significant improvement in CNT quality stability and pressure control.
Solution Approach 2:
Instead of varying the opening width in the horizontal plane, the patent introduces variation in the vertical dimension (depth direction). This dimensional approach creates the reverse tapered shape that stabilizes pressure and improves reliability with minimal added complexity.
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 stabilizes the quality of the CNT pattern and reduces the resistance of the transparent conducting film, achieving low resistance and high transmittance, making it suitable for applications such as heaters and sensors.
Implementation Method 1
a filter membrane having a porous structure to filter a nanocarbon material from a dispersion medium containing the nanocarbon material
Data Source
AI summary
A collecting filter has a filter membrane with a porous structure to filter a nanocarbon material from a dispersion medium containing the nanocarbon material, and a dense film having an opening through which the dispersion medium passes. The opening has a reverse tapered shape in which a first width at an inlet of the dispersion medium opposite to the filter membrane is smaller than a second width at a bottom side adjacent to the filter membrane.