  We report a controllable and precision approach in manipulating catalytic
nanomotors by strategically applied electric (E-) fields in three dimensions
(3-D). With the high controllability, the catalytic nanomotors have
demonstrated new versa-tility in capturing, delivering, and releasing of cargos
to designated locations as well as in-situ integration with nanome-chanical
devices (NEMS) to chemically power the actuation. With combined AC and DC
E-fields, catalytic nanomotors can be accurately aligned by the AC E-fields and
instantly change their speeds by the DC E-fields. Within the 3-D orthog-onal
microelectrode sets, the in-plane transport of catalytic nanomotors can be
swiftly turned on and off, and these cata-lytic nanomotors can also move in the
vertical direction. The interplaying nanoforces that govern the propulsion and
alignment are investigated. The modeling of catalytic nanomotors proposed in
previous works has been confirmed quan-titatively here. Finally, the prowess of
the precision manipulation of catalytic nanomotors by E-fields is demonstrated
in two applications: the capture, transport, and release of cargos to
pre-patterned microdocks, and the assembly of catalytic nanomotors on NEMS to
power the continuous rotation. The innovative concepts and approaches reported
in this work could further advance ideal applications of catalytic nanomotors,
e.g. for assembling and powering nanomachines, nano-robots, and complex NEMS
devices.
