Ultra-Mild Fabrication of Highly Concentrated SWCNT Dispersion Using Spontaneous Charging in Solvated Electron System

Area of Science:

• Materials Science
• Nanotechnology
• Chemistry

Background:

• Efficient dispersion of single-walled carbon nanotubes (SWCNTs) is crucial for their applications.
• Conventional methods often lead to defects, require excessive surfactants, or use harsh solvents.
• High-concentration, individually dispersed SWCNTs remain a significant challenge.

Purpose of the Study:

• To develop a novel, defect-free method for dispersing SWCNTs at high concentrations.
• To overcome the limitations of existing SWCNT dispersion techniques.
• To enable versatile applications of SWCNTs through a stable and compatible dispersion.

Main Methods:

• Utilized spontaneous charging of SWCNTs in a solvated electron system (potassium in hexamethyl phosphoramide - HMPA).
• Employed magnetic stirring for dispersion of charged SWCNTs (c-SWCNTs) in the charging medium.
• Confirmed individual SWCNT dispersion via liquid-crystalline behavior.

Main Results:

• Achieved defect-free c-SWCNT dispersions at high concentrations up to 20 mg/mL.
• Demonstrated successful dispersion of individual c-SWCNT strands.
• The c-SWCNT dispersion medium showed no reactivity with metals, polymers, or organic solvents.

Conclusions:

• The novel solvated electron system provides an effective, non-destructive method for SWCNT dispersion.
• The resulting defect-free, high-concentration c-SWCNT dispersions are compatible with various materials.
• This breakthrough enables diverse applications, including conductive films, fibers, and composites.