A spongy graphene based bimorph actuator with ultra-large displacement towards biomimetic application
A spongy graphene based bimorph actuator with ultra-large displacement towards biomimetic application
复制标题
基于海绵石墨烯的双压电晶片致动器，具有超大位移，适合仿生应用。
DOI：
10.1039/c4nr02768j
复制
发表时间：
2014-01-01
期刊：
影响因子：
6.7
通讯作者：
Chen, Wei
中科院分区：
文献类型：
--
作者：
Hu, Ying;Lan, Tian;Chen, Wei
双晶片作动器是由两层非对称膨胀并产生弯曲位移的作动器，目前已得到广泛的研究。它们的驱动性能在很大程度上取决于两层材料之间的热膨胀系数（CTE）的差异。在这里，通过引入海绵状石墨烯（sG）纸，具有大的负CTE和高的电热学性能，设计并制造了机电sG/PDMS双晶片致动器，在低压刺激下显示出超大的弯曲位移输出（在10 V下持续3秒，曲率约为1.2 cm(-1)），高位移与长度比（类似于0.79），以及交流电压下的振动运动（高达10 Hz）。它比其他机电双晶片驱动器大得多，速度也快得多。以sG/PDMS双晶片为“手指”，构造机械夹持器，在0.1 Hz方波电压（0-8 V）刺激下实现对物体的快速操作。所设计的双晶片致动器具有超大弯曲位移、低驱动电压和易于制造的特点，为机电致动器在实际仿生装置中的应用开辟了巨大的可能性。
Bimorph actuators, consisting of two layers with asymmetric expansion and generating bending displacement, have been widely researched. Their actuation performances greatly rely on the difference of coefficients of thermal expansion (CTE) between the two material layers. Here, by introducing a spongy graphene (sG) paper with a large negative CTE as well as high electrical-to-thermal properties, an electromechanical sG/PDMS bimorph actuator is designed and fabricated, showing an ultra-large bending displacement output under low voltage stimulation (curvature of about 1.2 cm(-1) at 10 V for 3 s), a high displacement-to-length ratio (similar to 0.79), and vibration motion at AC voltage (up to 10 Hz), which is much larger and faster than that of the other electromechanical bimorph actuators. Based on the sG/PDMS bimorph serving as the "finger", a mechanical gripper is constructed to realize the fast manipulation of the objects under 0.1 Hz square wave voltage stimulation (0-8 V). The designed bimorph actuator coupled with ultra-large bending displacement, low driven voltage, and the ease of fabrication may open up substantial possibilities for the utilization of electromechanical actuators in practical biomimetic device applications.