Healable and Foldable Carbon Nanotube/Wax Conductive Composite

Area of Science:

• Materials Science
• Nanotechnology
• Electrical Engineering

Background:

• Developing printable conductive materials for flexible electronics is crucial.
• Existing materials often lack durability, foldability, and self-healing properties.
• Rough surfaces pose challenges for creating reliable conductive patterns.

Purpose of the Study:

• To formulate a novel composite material for printing conductive patterns on rough surfaces.
• To achieve healable and foldable characteristics in the printed conductive material.
• To demonstrate the potential for electronic applications using this advanced composite.

Main Methods:

• A composite was formulated by mixing carbon nanotubes (CNTs) with wax for pen writing.
• The composite was tested for its percolation threshold and printability on paper and cloth.
• Infrared (IR) radiation was used for noncontact sintering of the printed patterns.
• The electrical properties of the patterns were evaluated after mechanical stress (bending, folding, crumpling) and damage (cutting).

Main Results:

• The composite exhibited a low percolation threshold (2.5 wt % CNTs).
• Conductive patterns were successfully printed on rough substrates like paper and cloth.
• Noncontact IR sintering efficiently enhanced electrical conductivity.
• Printed patterns showed insignificant resistance changes after bending, folding, and crumpling.
• The conductive composite demonstrated excellent healability, recovering conductivity after damage with heating.

Conclusions:

• The developed CNT-wax composite offers a promising solution for printable electronics on rough surfaces.
• The material's unique combination of foldability, healability, and conductivity opens new avenues for flexible and durable electronic devices.
• The study highlights the potential of this material for various applications, including conductive tracks on diverse substrates.