Mixed-Solvent Engineering as a Way around the Trade-Off between Yield and Purity of (7,3) Single-Walled Carbon...

Area of Science:

• Nanoscience and Materials Science
• Organic Chemistry
• Separation Science

Background:

• Purification of single-walled carbon nanotubes (SWCNTs) is crucial for advancing nanoscience.
• Existing purification methods often compromise between yield and purity.
• Common solvents are suboptimal for isolating specific SWCNT types.

Purpose of the Study:

• To develop a high-yield and high-purity isolation method for monochiral (7,3) SWCNTs.
• To engineer a mixed-solvent system for optimal SWCNT separation.
• To enable further research on the properties and reactivity of (7,3) SWCNTs.

Main Methods:

• Self-synthesis of poly(9,9-dioctylfluorene-alt-benzothiadiazole) with tailored characteristics.
• In-depth elucidation of the SWCNT extraction process.
• Mixed-solvent engineering using a toluene and tetralin combination.

Main Results:

• Achieved high-yield isolation of monochiral (7,3) SWCNTs.
• Demonstrated simultaneous high yield and exceptional purity.
• Identified a unique separation medium via toluene-tetralin mixture.
• Showcased the enhanced reactivity of (7,3) SWCNTs compared to other separated types.

Conclusions:

• A novel, efficient method for purifying specific SWCNT chiralities has been established.
• The developed mixed-solvent system overcomes limitations of traditional purification techniques.
• This work facilitates future investigations into rare and reactive SWCNT types.