Turning Trash Into Treasure: Egg-Shell Waste Embedded Gelatin Composite Biodegradable Films for Triboelectric Tactile...

Area of Science:

• Materials Science
• Nanotechnology
• Biotechnology

Background:

• Flexible electronics, or e-skins, aim for multi-functionality including flexibility, conformability, biodegradability, and energy autonomy.
• Current e-skins often use plastics, contributing to electronic waste (e-waste).
• Integrating multiple functionalities into a single e-skin device remains a significant challenge.

Purpose of the Study:

• To develop flexible, biodegradable e-skins that address the challenge of e-waste.
• To utilize waste eggshells as a component in e-skin fabrication.
• To create self-powered e-skins capable of sensing and data transmission.

Main Methods:

• Fabrication of flexible single-electrode triboelectric nanogenerators (S-TENGs) using a composite of gelatin and waste eggshells.
• Characterization of the S-TENGs' electrical output, pressure sensitivity, and response time.
• Evaluation of the e-skins' biodegradability in phosphate-buffered saline (PBS) and soil.

Main Results:

• Eggshell incorporation doubled the performance of gelatin-based S-TENGs.
• Achieved a peak output power density of ~34 W/m² under ~200 kPa pressure (~4 Hz).
• Demonstrated superior pressure sensitivity (3.48 V/kPa), fast response time (~0.4 ms), and precise tactile sensing capabilities.

Conclusions:

• The developed e-skins effectively transform bio-waste into functional electronic devices.
• These multi-functional e-skins offer self-powered tactile sensing, spatial pressure mapping, and information encoding (Morse code).
• The fabricated devices exhibit excellent biodegradability, presenting a sustainable alternative to plastic-based e-skins.