Switching and Gating of Current Through Nanoparticles

2 Chemical Switching and Gating of Current Through Nanoparticles 

The insulated STM tip, ligand-capped Au nanoparticle and octanethiol-coated planar Au substrate are shown. Length and shapes are not to scale. Reprinted with permission from Ref [47] 1998, American Chemical Society. 

High particle charges (increasing overpotential t), with t) = 1 s °, whereby 

Taken together, these results showed that SET was not only dependent on the nature of the ligands stabilizing the nanopartides, but also on the composition of the solution surrounding the function array. These points would be usefid when studying chemical signal transduction, where SET currents should be sensitive to single redox or analysis events. 

The solid lines show three l(V) curves measured over the course of several days. Each is offset for clarity. These different curves result from changes in the local charge distribution about the dot. The dashed lines are fits to the data using the orthodox Coulomb blockade model as discussed (d) l Vsd) characteristic of a 5.8 nm Au nanoparticle measured at 77 K several Coulomb steps of periods AVsd 200mV can be seen. Reprinted with permission from Ref [49] 1996, American Institute of Physics. 

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