Abstract
We report on the fabrication of nanomechanical devices for shuttling of electrons from oneelectrode to another. Each device consists of a 20 nm diameter gold nanoparticle embeddedwithin the gap between two gold electrodes. In two different kinds of shuttle-junctionsthe nanoparticle is attached to the electrodes through either (i) a single layer of1,8-octanedithiol or (ii) a multilayer of 1-octanethiol molecules. The thiol layers play therole of ‘damped springs’, such that when a sufficient voltage bias is applied to the junction,the nanoparticle is expected to start oscillating and thereby transferring electronsfrom one electrode to the other. For both kinds of shuttle-junctions we observedan abrupt increase in the transmitted current above a threshold voltage, whichcan be attributed to a transition from the stationary to the oscillating regime.The threshold voltage was found to be lower for single-layer shuttle-junctions.
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