Highly Stretchable Shape Memory Self-Soldering Conductive Tape with Reversible Adhesion Switched by Temperature

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Traditional solders (tin, silver paste) have limitations like high melting points and corrosive solvents.
• Next-generation electronic devices require advanced conductive interconnecting materials.

Purpose of the Study:

• To design a highly stretchable shape memory self-soldering conductive (SMSC) tape.
• To enable reversible adhesion switched by temperature for self-soldering circuits.
• To provide a new conductive interconnecting material for modern electronic devices.

Main Methods:

• Composed of silver particles encapsulated by shape memory polymer.
• Investigated shape memory and conductivity memory performance under strain.
• Evaluated anti-fatigue performance and reversible adhesion properties.

Main Results:

• SMSC tape exhibits perfect shape and conductivity memory, and anti-fatigue ability up to 90% strain.
• Achieved initial conductivity of 2772 S cm⁻¹ and maximum tensile strain of ~100%.
• Demonstrated reversible strong-to-weak adhesion transition induced by heating for self-soldering.

Conclusions:

• SMSC tape functions as both electrode and solder, offering stable conductivity and excellent shape memory.
• The temperature-switching reversible adhesion is crucial for practical applications.
• This material presents a novel approach for conductive interconnects in future electronics.