Design and Modeling of a Versatile Micro/Nanomotor Propulsion System by Light-Guided Dielectrophoresis

To develop active materials that can efficiently respond to external stimuli with designed mechanical motions is one of the major obstacles that have hindered the realization of nanomachines and nanorobots. Here, we propose an innovative working mechanism that allows multifold-translational-motion control of semiconductor micro/nanomotors by AC dielectrophoresis with simple visible-light stimulation. We study the dielectrophoresis forces on semiconducting particles of various geometries in aqueous suspension by modeling with the consideration of both the Maxwell-Wagner relaxation and electrical-double-layer-charging effect. With the obtained understanding, we rationally design a manipulation system that can versatilely transport semiconductor micro/nanomotors and orient them towards desired directions at the same time by tuning the light intensity in an electric field. This research may guide the development of a new type of micro/nanomachine platform with high versatility and control. It is relevant to nanorobotics and nanodevice assembly.

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