Abstract
Energy harvesting systems with lightweight, small size, excellent stretchability/deformability, as well as a large and stable power generation would be ideal wearable soft electronic devices applicable for future remote medical systems, healthcare, and robotics applications. For these demands, liquid electrets that possess high deformability, excellent processability, and maintain trapped electrostatic charges in the molecular liquids[1] can be the potential substances. Liquid electrets were developed in which π-conjugated molecules (e.g., porphyrin,[2] C60-fullerene[3])/polymers[4] are wrapped with bulky yet flexible branched-alkyl chains. Interestingly, electrostatic charges are trapped and retained in the liquid. Stretchable/deformable mechanoelectric generators capable of being stretched up to 300% were constructed with those liquid electrets. In addition, the device could adapt the frequencies in the range of the human body motion below 50 Hz.[3-4]
References
[1] Tateyama, A.; Nakanishi, T. Responsive Mater. 2023, 1, e20230001.
[2] Ghosh, A.; Nakanishi, T. et al. Nat. Commun. 2019, 10, 4210.
[3] Gupta, R. K.; Yoshida, M.; Saeki, A.; Guo Z.; Nakanishi T. Mater. Horiz. 2023, 10, 3458–3466.
[4] Shinohara, A.; Yoshida, M.; Pan, C.; Nakanishi, T. Polym. J. 2023, 55, 529–535.