A Printable Deep Eutectic/Copper Conductive Colloid for Wearable Devices.

Area of Science:

• Materials Science
• Nanotechnology
• Wearable Electronics

Background:

• Wearable electronics require advanced flexible materials for enhanced comfort and functionality.
• Developing conductive and stable materials is crucial for reliable sensor performance.

Purpose of the Study:

• To create a conductive pseudoplastic colloid for high-performance flexible strain sensors.
• To investigate the properties of a deep eutectic/copper colloid and its application in wearable devices.

Main Methods:

• Utilized oxygen-adsorbed copper powder as a conductive filler in a deep eutectic solvent.
• Formed donor-acceptor interactions to create a stable conductive colloid.
• Fabricated a flexible strain sensor by printing the colloid onto a textile substrate.

Main Results:

• The colloid exhibited low volume resistivity (1.19 × 10^-3 Ω·m), high viscosity, and excellent thermal stability.
• The fabricated sensor demonstrated ultrahigh sensitivity (gauge factor ≈ 1 × 10⁵) and a wide linear strain range (5-90%).
• The sensor successfully detected human body movements and was integrated into a functional glove.

Conclusions:

• The developed deep eutectic/copper colloid is a promising material for high-performance flexible strain sensors.
• The sensor's capabilities in detecting human motion highlight its potential in human-machine interaction and wearable technology.
• This research contributes to the advancement of flexible materials for next-generation wearable electronics.