Fuel-free
light-driven micromotors have attracted increasing attention since
the advantages of reversible, noninvasive, and remote maneuver are
on demand with excellent spatial and temporal resolution. However,
they suffer from a challenging bottleneck of the rather modest motion
speed, which hinders their applications, needing to overcome the water
flow movement in environmental water. Herein, we demonstrate a near-infrared
(NIR) light-steered, precise navigation-controlled micromotor based
on a reduced graphene oxide aerogel microsphere (RGOAM), which possesses
an isotropic structure and is easily prepared by a one-step electrospray
approach other than conventional light-propelled micromotors with
the Janus structure. Benefiting from the ultralight weight of the
aerogel and lesser fluid resistance on the water surface, the RGOAM
motors show a higher motion speed (up to 17.60 mm/s) than that in
the published literature, letting it overcome counterflow. Taking
advantage of the photothermal conversion capacity of the RGOAM under
an asymmetric light field, it is capable of moving both on the water
driven by the Marangoni effect and under the water via light-manipulated
density change. The motion direction and speed on water as well as
the “start/stop” state can be precisely steered by NIR
light even in a complicated maze. Due to its strong adsorption and
loading capacity, the RGOAM can be applied for active loading-transport-release
of dyes on demand as well as micropart assembling and shaping. Our
work provides a strategy to achieve high speed, precise navigation
control, and functional extensibility simultaneously for micromotors,
which may offer considerable promise for the broad biomedical and
environmental applications.