We investigated the effects of additives incorporated into the electrode layer in order to improve the actuation
performance of dry-type carbon nanotube (CNT) actuators. Especially, the addition of conductive nano-particles such as
polyaniline (PANI) and polypyrrole (PPy) improves actuation performance very much rather than the addition of nonconductive
nano-particles such as mesoprous silica (MCM-41 type). In this paper, we studied on the influences of
applied voltage, species of ionic liquid (IL), amounts of IL, thickness of actuator to optimize actuation performance.
Imidazolium type ionic liquids with three different anions, that is, 1-ethyl-3-methylimidazolium (EMI) as a cation and
tetrafluoroborate (BF4), trifluoromethanesulfonate (OTf), and bis(trifluoromethanesulfonyl)imide (TFSI) as anions were
chosen in this study. EMIBF4 is the most suitable IL for our CNT actuator including PANI in the electrode layer. We
tuned the amount of IL and the thickness of actuator. As a result, the strain was improved to be 2.2% at 0.1 Hz by
applying the voltage of 2.5 V. This improved value is almost 2 times larger than our previous results. We also show the
potential of improved CNT actuators for a thin and light Braille display.