Ji Xinyang, Ying Yuxin, Ge Chuanyang, Zhu Yixue, Wang Kaixuan, Di Yu, Wang Sana, Li Dazhi, Zhang Jia, Hu PingAn, Qiu Yunfeng
School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, People's Republic of China.
Nanotechnology. 2019 Nov 1;30(44):445601. doi: 10.1088/1361-6528/ab359e.
Graphene has drawn tremendous attention for the fabrication of actuators because of its unique chemical and structural features. Traditional graphene actuators need integration with polymers or other responsive components for shape-changeable behaviour. Searching for a sole material with asymmetric properties is difficult and challenging for actuators that are responsive to external stimulus. Herein, asymmetrically synchronous reduction and assembly of a graphene oxide (GO) film with oxygen-containing group gradients was prepared on various metal foils. Such film possessed asymmetric surface chemical components on both sides, which showed reversible deformation via alternating moisture. Importantly, we can detect the moisture change via recording the voltage pulse during self-deformation on the basis of spontaneous HO ions diffusion across the GO film without the need of power input. Finally, a smart gripper was developed using a moisture responsive GO film. Present work opens a new avenue for developing smart actuator using a sole material and simultaneously realizing the detection of deformation in self-powered mode.
由于其独特的化学和结构特性，石墨烯在致动器制造方面引起了极大关注。传统的石墨烯致动器需要与聚合物或其他响应性组件集成以实现形状可变行为。对于响应外部刺激的致动器而言，寻找具有不对称特性的单一材料既困难又具有挑战性。在此，在各种金属箔上制备了具有含氧基团梯度的氧化石墨烯（GO）薄膜的不对称同步还原和组装。这种薄膜两侧具有不对称的表面化学成分，通过交替受潮显示出可逆变形。重要的是，我们可以基于自发的HO离子在GO薄膜上扩散而无需输入电源，通过记录自变形过程中的电压脉冲来检测湿度变化。最后，使用湿度响应性GO薄膜开发了一种智能夹具。目前的工作为使用单一材料开发智能致动器并同时实现自供电模式下的变形检测开辟了一条新途径。
