Dual Polymer Dispersion for Semiconducting Carbon Nanotube Separation
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Solution Overview
Problem
Existing methods for separating semiconducting single walled carbon nanotubes suffer from low yield and purity issues, with current methods either achieving high yield with low purity or high purity with low yield.
Innovation Solution
A dual polymer system is used where one polymer binds faster to semiconducting single walled carbon nanotubes with a weaker interaction, and another polymer binds slower with a stronger interaction, enhancing dispersion and separation efficiency by mixing these polymers with the nanotubes in a solvent and centrifuging to separate the supernatant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If single polythiophene is used for selective dispersion, then yield is improved, but purity deteriorates
Solution Approach 1:
The patent combines two different polymers (polythiophene and polycarbazole) into a dual-polymer system to achieve both high yield and high purity. The synergistic effect of the two polymers overcomes the limitations of using either polymer alone, resolving the contradiction between yield and purity.
Solution Approach 2:
The invention uses a composite dispersant system consisting of two distinct polymers with different binding characteristics. This composite approach allows the system to simultaneously achieve fast binding (for high yield) and strong binding (for high purity) that neither polymer could achieve alone.
2Manufacturing precision
If single polycarbazole is used for selective dispersion, then purity is improved, but yield deteriorates
Solution Approach 1:
By merging polycarbazole with polythiophene in a dual-polymer system, the invention captures both the high purity advantage of polycarbazole and the high yield advantage of polythiophene, eliminating the trade-off between these two parameters.
Solution Approach 2:
The invention changes the parameter of dispersant composition from a single polymer to a dual-polymer mixture, which fundamentally alters the binding dynamics to simultaneously achieve fast and strong binding for high yield and purity.
3Ease of operation
If selective dispersion method is used, then operation simplicity and purity are improved, but yield deteriorates
Solution Approach 1:
The use of a composite dual-polymer dispersant system enables the selective dispersion method to achieve both operational simplicity and high yield, overcoming the limitation of low yield that plagued earlier single-polymer approaches.
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 achieves high-yielding, high-purity semiconducting single walled carbon nanotubes, reducing costs and improving the repeatability and stability of the separation process, enabling their use in high-performance electronic devices.
Implementation Method 1
both the first polymer and the second polymer can be dissolved in the solvent, and can specifically bind to the semiconducting single walled carbon nanotubes; a speed of binding the first polymer to the semiconducting single walled carbon nanotubes is greater than a speed of binding the second polymer to the semiconducting single walled carbon nanotubes; and a binding strength between the first polymer and the semiconducting single walled carbon nanotubes is less than a binding strength between the second polymer and the semiconducting single walled carbon nanotubes
Implementation Method 2
centrifuging the liquid phase mixed system, and separating a supernatant to implement selective separation of the semiconducting single walled carbon nanotubes
Data Source
AI summary
The disclosure discloses a method and reagent for improving a yield of selective dispersion of semiconducting carbon nanotubes. The method comprises: fully mixing single walled carbon nanotube samples, a first polymer, and a second polymer in a solvent to form a liquid phase mixed system, enabling the single walled carbon nanotube samples to be fully dispersed in the liquid phase mixed system, centrifuging the liquid phase mixed system, and separating a supernatant to implement selective separation of the semiconducting single walled carbon nanotubes; wherein both the first polymer and the second polymer can specifically bind to the semiconducting single walled carbon nanotubes; a speed of binding the first polymer to the semiconducting single walled carbon nanotubes is greater than a speed of binding the second polymer to the semiconducting single walled carbon nanotubes; and a binding strength between the first polymer and the semiconducting single walled carbon nanotubes is less than a binding strength between the second polymer and the semiconducting single walled carbon nanotubes. The disclosure can realize high-yielding selective separation of high-purity and highly dispersive semiconductoring single walled carbon nanotubes, thereby reducing costs, and improving the repeatability and stability of the separation.