Controlling cluster dynamics at the nano scale

Gold nanoclusters deposited on highly oriented pyrolitic graphite are selectively detached andmoved as a function of their size using the atomic force microscope. Control is obtained working inamplitude modulation and by tuning the interaction strength between oscillating tip and clusters.Weshow that fundamental controlling parameter is the energy dissipation that can be adjusted varyingthe tip amplitude oscillation and monitoring the phase shift signal. We characterize the energydetachment threshold of nanoclusters with sizes of 24 and 42 nm of diameter, then we preciselyinduce and control the movement of clusters with diameter below 40 nm within a mixed deposition. © 2009 American Institute of Physics.