Alkyl-C₆₀ liquid electrets as deformable mechanoelectric generators.

Area of Science:

• Materials Science
• Soft Electronics
• Energy Harvesting

Background:

• Soft electronics and wearable devices require continuous power, often necessitating battery-less solutions.
• Electrets offer potential as a power source due to their ability to retain electric charges.
• Developing new electret materials is crucial for advancing self-powered flexible electronics.

Purpose of the Study:

• To create novel liquid electrets from alkylated C60 molecules for use in deformable electronic devices.
• To investigate the charge-holding properties of C60-based liquids.
• To demonstrate the fabrication and functionality of mechanoelectric generator (MEG) devices using these liquid electrets.

Main Methods:

• Synthesized C60 mono-adducts and bis-adducts with branched long-alkyl chains to create room-temperature solvent-free liquids.
• Utilized corona-discharging to negatively pole the alkyl-C60 liquids.
• Impregnated nylon fabric with the poled liquids and fabricated deformable MEG devices.

Main Results:

• Alkylated C60 liquids, particularly the bis-adduct, demonstrated effective charge retention, attributed to bulky alkyl chains providing insulation and charge trapping.
• The liquid-based MEGs functioned as micropower sources and vibration sensors, generating voltage pulses even when deformed (folded, twisted, rolled).
• The MEGs operated at frequencies matching human body motion, indicating suitability for wearable applications.

Conclusions:

• Alkylated C60 liquids are promising candidates for battery-less power sources in soft and wearable electronics.
• The developed MEG devices show potential for integration into body motion sensors and healthcare monitoring systems.
• This work highlights a new strategy for creating flexible, self-powered electronic components using liquid electrets.