Innovative Mechanisms and Technologies for Nanomanufacturing, Nanomanipulation, and Assembling
Dr.Fan fabricates nanowires, nanorings, nanodiscs, and 3-D nanoporous superstructures. She also invented the "electric tweezers" based on the combined AC and DC electric fields. The electric tweezers can transport nanoparticles with independently controlled orientation and transport direction along arbitrary trajectories. Two nanowires (6 micrometer in length and 300 nm in diameter) with initial separation distance of 180 micrometers can be transported towards each other and connected tip to tip. The precision is at least 300 nm. Nanowires can also rotate seamlessly after transportation. The rotation of the nanowires can be instantly switched on or off with controlled rotation speed (to at least 26000 rpm for a free rotating nanowire), chirality, and total angle of rotation. Recently, Dr. Fan's group discovered an original mechanism that leads to highly efficient reconfigurable operation of semiconductor nanomotors. One can facilely choose and switch the operation modes of Si nanomotors instantly and reversibly, including acceleration, deceleration, stop, and reversal of rotation orientation. The operation of the micro/nanodevice in response to external stimuli can be considered as a mechanical analogy of the field effect transistors, which are the basic building blocks of CPU used in computers, cells phone, laptops, and many electronic instruments.