Beilstein J. Nanotechnol.2014,5, 133–140, doi:10.3762/bjnano.5.13
studies of metal NPs. The forces needed to overcome static friction and move individual polyhedron-like Au and sphere-like AgNPs on an oxidized Si surface are measured and analyzed with respect to the morphology of the NPs.
Experimental
The 150 nm Au NPs (BBI International) were deposited from solution
onto oxidized silicon wafers (Semiconductor Wafer Inc., 50 nm of thermal oxide). The samples were annealed for 1 h at 500 °C prior to every experiment to remove the surfactant. Rounded AgNPs were produced by laser-induced (532 nm, Expla, NL200) partial melting [19] of pentagonal Ag nanowires (Blue
morphology of AgNPs was determined by the conditions of the laser annealing of the target nanowires [21][22]. At a relatively small laser pulse energy, rounded structures formed on both ends of nanowires (Figure 3a). At a higher pulse energy the whole NW melted into separated round NPs due to Plateau
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Figure 1:
Schematics of the manipulation experiments inside an SEM. Solid arrow indicates the direction of th...