A team of researchers from NIMS (National Institute for Materials Science), Hokkaido University, and Meiji Pharmaceutical University has introduced a groundbreaking gel electret capable of maintaining a large electrostatic charge for wearable sensors. Combining this innovative gel with flexible electrodes has led to the creation of a sensor that can detect low-frequency vibrations, such as those produced by human motion, and convert them into voltage signals, making it ideal for applications in healthcare monitoring. The study detailing this advancement has been published in the prestigious journal Angewandte Chemie International Edition.
Developing Soft, Lightweight Power-Generating Materials:
The pursuit of soft, lightweight materials for power generation in electronics has gained momentum, particularly in fields like healthcare and robotics. Electret materials, known for their stable electrostatic charge retention, are crucial for the development of vibration-powered devices that do not rely on external power sources.
Innovative Gel-Electret Design:
Building on previous research, the team at NIMS successfully created an alkyl–π gel by enhancing the charge retention properties of alkyl–π liquids. This gel, generated by the addition of a low-molecular-weight gelator to the liquid, exhibited an exceptional 40 million-fold increase in elastic storage modulus compared to its liquid counterpart, offering improved containment of electrostatic charges and enhanced sealing capabilities. Notably, the gel-electret showcased a 24% boost in charge retention compared to the base liquid, leading to superior power generation capabilities.
Promising Sensor Development:
By integrating flexible electrodes with the gel-electret, the researchers developed a vibration sensor capable of detecting frequencies as low as 17 Hz and generating an output voltage of 600 mV—marking an impressive 83% enhancement over traditional electret-based sensors. The team's future endeavors involve refining the electret characteristics and gel strength to create wearable sensors that can detect subtle vibrations and various strain deformations.
Towards a Circular Economy:
Notably, the alkyl–π gel used in this study is recyclable and reusable, aligning with the principles of a circular economy. As the research progresses, the utilization of this gel as a vibration sensor material is poised to contribute to sustainable practices and technological advancements.
The unveiling of this novel gel electret-based device signifies a significant leap forward in the realm of wearable sensor technology, paving the way for enhanced healthcare monitoring and innovative applications in various industries.