Plasma-Induced Wrinkle-Crack Dual Structure for Robust Directional Strain Sensing in Dynamic Motion Perception.

Area of Science:

• Materials Science
• Nanotechnology
• Sensor Technology

Background:

• Flexible multi-directional strain sensors are crucial for advanced applications but face challenges in sensitivity, stability, and linearity.
• Existing sensors struggle to reliably detect forces from multiple directions simultaneously.

Purpose of the Study:

• To develop a high-reliability flexible strain sensor capable of sensitive and linear multi-directional force detection.
• To engineer a novel structure that enhances sensor performance and durability.

Main Methods:

• Fabrication of a multi-layer structure using pre-stretching and oxidative plasma bombardment for film stress engineering.
• Creation of a plasma-induced wrinkle-crack dual structure on an elastomer surface.
• Controlled adjustment of wrinkle morphology and orientation via pre-stretching direction under plasma treatment.

Main Results:

• The wrinkle-crack structure significantly improved linearity and suppressed crack propagation.
• Anisotropic properties were achieved through coexisting parallel wrinkle and perpendicular crack structures, enhancing directional detection.
• The sensor demonstrated a high gauge factor (GF = 454) and excellent cyclic durability (>100,000 cycles).

Conclusions:

• The developed flexible strain sensor offers high reliability and multi-directional force detection capabilities.
• The plasma-induced wrinkle-crack dual structure is a promising approach for next-generation flexible sensors.
• Potential applications include wearable electronics and robot motion detection.