AI Article Synopsis
- Gold nanospheres were manipulated on a rippled glass surface with an ultrathin graphitic layer, created using ion beam sputtering.
- In ambient conditions, these nanoparticles move along single grooves and are temporarily trapped at local constrictions before jumping to neighboring channels.
- The jumping mechanism resembles a ratchet, where particles move towards areas of minimum slope, and the findings extend a collisional model previously used for flat surfaces to this unique geometric scenario.
Article Abstract
Gold nanospheres have been manipulated by atomic force microscopy on a rippled glass surface produced by ion beam sputtering and coated with an ultrathin (10 nm thick) graphitic layer. This substrate is characterized by irregular wavy grooves running parallel to a preferential direction. Measurements in ambient conditions show that the motion of the nanoparticles is confined to single grooves ('channels'), along which the particles move till they are trapped by local bottlenecks. At this point, the particles cross the ripple pattern in a series of consecutive jumps and continue their longitudinal motion along a different channel. Moreover, due to the asymmetric shape of the ripple profiles, the jumps occur in the direction of minimum slope, resembling a ratchet mechanism. Our results are discussed, extending a collisional model, which was recently developed for the manipulation of nanospheres on flat surfaces, to the specific geometry of this problem.
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| http://dx.doi.org/10.1088/0957-4484/25/48/485302 | DOI Listing |
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