Ultralight multiwalled carbon nanotube aerogel

Area of Science:

• Materials Science
• Nanotechnology
• Polymer Chemistry

Background:

• Multiwalled carbon nanotubes (MWCNTs) are promising materials, but achieving ultralight aerogels requires overcoming challenges in dispersion and network formation.
• Theoretical predictions suggest enhanced interactions between nanotubes can lower critical concentrations for percolation network formation.

Purpose of the Study:

• To fabricate ultralight multiwalled carbon nanotube (MWCNT) aerogel monoliths with enhanced properties.
• To investigate the role of polymer functionalization in facilitating MWCNT network formation at ultralow concentrations.

Main Methods:

• Dispersion and functionalization of MWCNTs using poly(3-(trimethoxysilyl) propyl methacrylate) (PTMSPMA).
• Hydrolysis and condensation of PTMSPMA to create chemical bonds between MWCNTs.
• Solvent removal from MWCNT wet gel to form aerogel monoliths.
• Characterization of structural, mechanical, electrical, and sensing properties.

Main Results:

• Fabrication of the lightest free-standing MWCNT aerogel (4 mg/cm³) with a macroporous honeycomb structure.
• Achieved a high surface area (580 m²/g) due to hierarchical porosity.
• Demonstrated excellent compression recoverable properties and electrical conductivity (3.2 × 10⁻² S·cm⁻¹, tunable up to 0.67 S·cm⁻¹).

Conclusions:

• The functionalization strategy effectively promotes MWCNT percolation and gelation at ultralow concentrations.
• The resulting ultralight MWCNT aerogels possess a unique combination of properties suitable for advanced sensing applications.
• This work provides a pathway for designing novel nanostructured materials with tailored properties.