  We report on the fabrication and measurements of platinum-self-aligned
nanogap devices containing cubed iron (core)/iron oxide (shell) nanoparticles
(NPs) with two average different sizes (13 and 17 nm). The nanoparticles are
deposited by means of a cluster gun technique. Their trapping across the
nanogap is demonstrated by comparing the current vs voltage characteristics
(I-Vs) before and after the deposition. At low temperature, the I-Vs can be
well fitted to the Korotkov and Nazarov Coulomb blockade model, which captures
the coexistence of single-electron tunneling and tunnel barrier suppression
upon a bias voltage increase. The measurements thus show that Coulomb-blockaded
devices can be made with a nanoparticle cluster source, which extends the
existing possibilities to fabricate such devices to those in which it is very
challenging to reduce the usual NP agglomeration given by a solution method.
