Imaging latex-carbon nanotube composites by subsurface electrostatic force microscopy.

Area of Science:

• Materials Science
• Nanotechnology
• Surface Science

Background:

• Atomic force microscopy (AFM) offers non-destructive imaging of conductors in insulating polymers.
• Previous studies primarily used linear polymer films, limiting observed features.

Purpose of the Study:

• To image carbon nanotube dispersion in a latex-based conductive composite using electrostatic force microscopy (EFM).
• To analyze EFM data with a fixed-potential model to determine nanotube depth, radius, and polymer dielectric constant.

Main Methods:

• Utilized electrostatic force microscopy (EFM) for high-resolution imaging.
• Applied a fixed-potential model to analyze probe-nanotube electrostatics.
• Investigated carbon nanotube dispersion within a latex-based conductive composite.

Main Results:

• Observed unique imaging features in the latex composite compared to linear polymer films.
• The fixed-potential model indicated nanotube depths slightly above the film-air interface.
• Identified potential influence of water-mediated charge build-up on EFM contrast.

Conclusions:

• EFM is effective for characterizing conductive nanomaterials in complex polymer matrices.
• Water accumulation at the film-air interface may significantly impact EFM imaging in ambient environments.
• The study provides insights into nanotube dispersion and interfacial phenomena in conductive composites.