CTF-based soft touch actuator for playing electronic piano

Manmatha Mahato, Rassoul Tabassian, Nguyen Van Hiep, Saewoong Oh, Sanghee Nam, Won-Jun Hwang and Il-Kwon Oh ()
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Manmatha Mahato: Korea Advanced Institute of Science and Technology (KAIST)
Rassoul Tabassian: Korea Advanced Institute of Science and Technology (KAIST)
Nguyen Van Hiep: Korea Advanced Institute of Science and Technology (KAIST)
Saewoong Oh: Korea Advanced Institute of Science and Technology (KAIST)
Sanghee Nam: Korea Advanced Institute of Science and Technology (KAIST)
Won-Jun Hwang: Korea Advanced Institute of Science and Technology (KAIST)
Il-Kwon Oh: Korea Advanced Institute of Science and Technology (KAIST)

Nature Communications, 2020, vol. 11, issue 1, 1-15

Abstract: Abstract In the field of bioinspired soft robotics, to accomplish sophisticated tasks in human fingers, electroactive artificial muscles are under development. However, most existing actuators show a lack of high bending displacement and irregular response characteristics under low input voltages. Here, based on metal free covalent triazine frameworks (CTFs), we report an electro-ionic soft actuator that shows high bending deformation under ultralow input voltages that can be implemented as a soft robotic touch finger on fragile displays. The as-synthesized CTFs, derived from a polymer of intrinsic microporosity (PIM-1), were combined with poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT-PSS) to make a flexible electrode for a high-performance electro-ionic soft actuator. The proposed soft touch finger showed high peak-to-peak displacement of 17.0 mm under ultralow square voltage of ±0.5 V, with 0.1 Hz frequency and 4 times reduced phase delay in harmonic response compared with that of a pure PEDOT-PSS-based actuator. The significant actuation performance is mainly due to the unique physical and chemical configurations of CTFs electrode with highly porous and electrically conjugated networks. On a fragile display, the developed soft robotic touch finger array was successfully used to perform soft touching, similar to that of a real human finger; device was used to accomplish a precise task, playing electronic piano.

Date: 2020
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DOI: 10.1038/s41467-020-19180-3

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