Direct-Ink-Writing Multifunctional Flexible Robotic Electronic Skin.

Area of Science:

• Robotics
• Materials Science
• Sensor Technology

Background:

• Robotic electronic skin (e-skin) faces challenges in scalability, cost, and design flexibility.
• Existing e-skins struggle to support multimodal sensing and customization.

Purpose of the Study:

• To develop a scalable and customizable robotic e-skin using direct-ink writing technology.
• To enable multimodal sensing (pressure, temperature, shear force) with facile sensor design modifications.

Main Methods:

• Fabrication of e-skin using direct-ink writing technology.
• Development of pyramid-structured tactile sensors for pressure detection.
• Creation of a 4x9 flexible sensor array for pressure mapping.
• Integration with a robotic gripper and K-nearest neighbor classifier for object recognition.
• Modification of sensing layers for temperature and shear force detection.

Main Results:

• The tactile sensor achieved high sensitivity (670 kPa⁻¹) and long-term stability (>3500 cycles) with minimal signal drift (<3%).
• A 4x9 sensor array enabled real-time pressure mapping on various surfaces.
• Object recognition accuracy reached 97.7% when integrated with a robotic gripper.
• The e-skin demonstrated dual-mode sensing capabilities for temperature and shear force.

Conclusions:

• Direct-ink writing offers a scalable and customizable approach for fabricating multimodal robotic e-skin.
• The developed e-skin platform exhibits high performance and versatility for robotics, prosthetics, and human-machine interfaces.