Carbon nanotubes on a spider silk scaffold

Area of Science:

• Materials Science
• Biomaterials Engineering
• Nanotechnology

Background:

• Spider silk offers excellent mechanical properties but lacks electrical conductivity.
• Integrating spider silk into electronic devices requires compatible conductive materials.
• Silk's properties change with hydration, posing challenges for material integration.

Purpose of the Study:

• To investigate the compatibility of spider silk with functionalized carbon nanotubes.
• To develop a method for creating electrically conductive spider silk fibers.
• To explore the potential of these composite fibers in sensing and actuation.

Main Methods:

• Coating spider silk with amine-functionalized multi-walled carbon nanotubes.
• Utilizing a water-assisted mechanical shear method for uniform nanotube adhesion.
• Characterizing the properties of the coated silk fibers, including conductivity, flexibility, and response to environmental stimuli.

Main Results:

• Achieved uniform adhesion and bonding of nanotubes to the silk fiber surface.
• Produced tough, custom-shaped, flexible, and electrically conductive silk fibers after drying and contraction.
• Demonstrated reversible sensitivity of conductivity to strain and humidity.

Conclusions:

• Amine-functionalized multi-walled carbon nanotubes show strong affinity for spider silk.
• The developed coating method yields robust, conductive biomaterial fibers.
• Proof-of-concept sensors and actuators were successfully demonstrated using the functionalized silk fibers.