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

Trapping and electrical characterization of single core/shell iron-based nanoparticles in self-aligned nanogaps