A Giant, High-frequency Oscillation of Metal Strip Actuator under DC   Electric Field
  Different from conventional electroactive polymers, here we firstly present a new facile actuator made from aluminum alloy. The high-frequency electrically induced flapping motion was characterized under varied physical factors. This electroactuation results from alternative processes of charge induction and discharge, which is confirmed by the existence of periodical pulse current in the circuit. The metal actuator is of great stability and can maintain several days if not for any structural fatigue. Easy fabrication, high tunable frequency and durability make it potential for implementation of actuators for sensors, microelectromechanical systems and robotics. 
Chengyi Xu, Fanyi Cai, Baozhang Li, Chunye Xu, Jianming Zheng
cond-mat.mtrl-sci