Single-Walled Carbon Nanotube Coating via Chemical Vapour Deposition
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Solution Overview
Problem
There is no existing method to effectively layer a substance on long single-walled carbon nanotubes (SWCNTs) to stabilize their properties and add new functionalities, as previous attempts have resulted in short product lengths and damage to the SWCNTs during high-temperature treatments.
Innovation Solution
A structure comprising a 1st single-walled carbon nanotube with a length of 50 nm or more, coated with a 2nd layer made of boron nitride, transition metal dichalcogenides, carbon, black phosphorus, or silicon, applied in a coaxial tubular manner, using a method involving gas flow and heating to form the layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature treatment is applied to form layered structure on single-walled carbon nanotube, then the layered structure is formed successfully, but the single-walled carbon nanotube suffers damage
Solution Approach 1:
The patent applies preliminary action by first forming the single-walled carbon nanotube with desired properties, then subsequently forming the layered structure on its surface. This sequence allows the SWCNT to be prepared in advance before the high-temperature treatment, minimizing exposure time to damaging conditions while ensuring the layered structure is formed on an intact nanotube.
Solution Approach 2:
The patent utilizes parameter changes by controlling the temperature, time, and atmospheric conditions during the layered structure formation process. By optimizing these parameters, the treatment temperature and duration are kept as low as possible while still achieving complete coverage, thereby reducing damage to the SWCNT while ensuring reliable layered structure formation.
2Reliability
If layered structure is formed on short single-walled carbon nanotubes, then the layered structure can be synthesized, but the product length is limited and alignment is lost
Solution Approach 1:
The patent applies preliminary action by first synthesizing long, well-aligned single-walled carbon nanotubes with controlled properties, and then forming the layered structure on these pre-prepared nanotubes. This approach preserves the length and alignment achieved in the initial SWCNT synthesis step, rather than attempting to create both the nanotube and layered structure simultaneously which would limit length.
3Adaptability or versatility
If single-walled carbon nanotube is used without protective layer, then the nanotube maintains its intrinsic properties, but the properties are easily affected by surrounding environment
Solution Approach 1:
The patent applies this principle by forming a thin film layered structure on the surface of the single-walled carbon nanotube. This flexible thin film provides environmental protection and stability while maintaining the overall simplicity of the nanotube structure. The layered coating acts as a protective shell that shields the SWCNT from environmental factors without significantly increasing structural complexity.
Solution Approach 2:
The patent creates a composite material structure by combining the single-walled carbon nanotube with a layered material coating. This composite approach provides the best of both components: the excellent electrical and mechanical properties of the SWCNT combined with the environmental stability and protective characteristics of the layered material, thereby improving adaptability without excessive 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
The solution provides a stable and functionalized SWCNT structure that maintains its alignment and length, enhancing its environmental resilience and adding new properties, suitable for applications in electronic and optical devices.
Implementation Method 1
a method involving gas flow and heating to form the layers
Data Source
AI summary
The present invention provides a laminate structure in which the properties of a single-walled CNT, which are susceptible to surrounding environment, are stabilized by protecting the surface of the single-walled CNT with a proper substance, and/or another property is imparted to the single-walled CNT. The present invention provides a structure which comprises a first single-walled carbon nanotube having a length of 50 nm or longer, preferably 100 nm or longer, and a second layer laminated on the first single-walled carbon nanotube, wherein the second layer comprises at least one substance selected from the group A consisting of first boron nitride, first transition metal dichalcogenide, second carbon, first black phosphorus and first silicon.