Multidimensional Force Sensors Based on Triboelectric Nanogenerators for Electronic Skin

Area of Science:

• Materials Science
• Robotics
• Sensor Technology

Background:

• The development of electronic skin (E-skin) with multidimensional force detection capabilities is crucial for advanced robotics and human-computer interaction.
• Existing sensors often struggle to simultaneously measure both normal pressure and shear forces effectively.

Purpose of the Study:

• To propose a fully elastic E-skin sensor based on single-electrode-mode triboelectric nanogenerators (S-TENGs) that can simultaneously detect normal pressure and shear force.
• To optimize the sensor's structure for high sensitivity and linearity in pressure detection.

Main Methods:

• Fabrication of an elastic E-skin using S-TENGs with a hemispherical curve-structure design.
• Optimization of the sensor structure, including partitioning the lower tribolayer into symmetric parts.
• Utilizing the output voltage sum and ratio of two S-TENGs for sensing normal pressure and shear force, respectively.

Main Results:

• The pressure sensor demonstrated high linearity and sensitivity (144.8 mV/kPa) in the low-pressure region.
• A multidimensional force sensor was successfully fabricated by partitioning the tribolayer.
• The sensor successfully recognized changes in the grabbing state when mounted on a robotic manipulator.

Conclusions:

• The proposed elastic E-skin sensor effectively achieves simultaneous detection of normal pressure and shear force.
• The sensor exhibits significant potential for applications in tactile sensing for robotic manipulation, human-robot interactions, environmental awareness, and object recognition.