Highly Switchable Adhesion of N-Doped Graphene Interfaces for Robust Micromanipulation
Highly Switchable Adhesion of N-Doped Graphene Interfaces for Robust Micromanipulation
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DOI：
10.1021/acsami.8b18793
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发表时间：
2019-02-06
影响因子：
9.5
通讯作者：
Xia, Zhenhai
中科院分区：
文献类型：
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作者：
Wan, Yiyang;Gao, Yong;Xia, Zhenhai
我们展示了一种N掺杂石墨烯界面，具有高度可切换的粘附性和强大的外部电信号触发的微操作能力。当施加小的直流或交流偏压时，这种纳米结构的表面可以收集环境中的水分，在石墨烯和靶表面之间形成大量的水桥，从而导致粘附力的急剧变化。开启和关闭偏压可以控制这种石墨烯界面作为一个健壮的微/纳米操纵器来拾取和丢弃各种微/纳米对象以进行精确组装。分子动力学模拟表明，石墨烯水界面上的电感应电双层和有序的冰状结构加强了水的桥梁，从而增强了力的可切换性。除了微/纳米操纵，这种可切换的粘合可能具有许多技术含义，如攀爬机器人、传感器、微流体设备和先进的药物输送。
We demonstrated an N-doped graphene interface with highly switchable adhesion and robust micro manipulation capability triggered by external electric signals. Upon applying a small dc or ac electrical bias, this nanotextured surface can collect environmental moisture to form a large number of water bridges between the graphene and target surface, which lead to a drastic change in adhesive force. Turning on and off the electrical bias can control this graphene interface as a robust micro/nanomanipulator to pick up and drop off various micro/nano-objects for precise assembling, Molecular dynamics simulation reveals that the electrically induced electric double layer and ordered icelike structures at the graphene water interface strengthen the water bridges and consequently enhance force switchability. In addition to the micro-/nanomanipulation, this switchable adhesion may have many technical implications such as climbing robots, sensors, microfluidic devices, and advanced drug delivery.