Breathable Metal-Organic Framework Enhanced Humidity-Responsive Nanofiber Actuator with Autonomous Triboelectric...

Area of Science:

• Soft robotics
• Triboelectric nanogenerators
• Smart materials
• Human-machine-environment interface

Background:

• Next-generation soft robotics require autonomous manipulation and perception triggered by environmental factors.
• Humidity is a sustainable energy source for self-powered actuation in smart devices.
• Developing smart grippers with integrated sensing capabilities is crucial for advanced robotics.

Purpose of the Study:

• To develop a humidity-driven soft gripper for autonomous object manipulation and identification.
• To explore the use of humidity-induced actuation for generating distinguishable triboelectric signals.
• To create a smart human-machine-environment interface using soft robotic principles.

Main Methods:

• Fabrication of a thermo-modified electrospun polyvinylpyrrolidone/poly(acrylic acid)/MIL-88A (T-PPM) nanofibrous film.
• Design of a bilayer humidity-responsive actuator (T-HRA) mimicking natural structures for enhanced actuation.
• Characterization of the T-PPM material as a tribo-positive material and evaluation of the T-HRA's performance.

Main Results:

• The T-HRA exhibited significant humidity-driven actuation (2.41 cm^-1) with a fast response rate (0.084 cm^-1 s^-1).
• The T-PPM material was confirmed as tribo-positive, enabling signal generation upon contact.
• The smart soft gripper successfully generated distinct electrical signals when interacting with objects of different materials.

Conclusions:

• A novel concept for soft robots capable of autonomous object manipulation and environmental information acquisition is proposed.
• The developed humidity-responsive actuator and triboelectric sensing mechanism offer a pathway for interactive soft robotics.
• This work demonstrates the potential of using environmental humidity as an energy source for integrated robotic functions.