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Metallic nanoparticles offer possibilities to build basic electric deviceswith new functionality and improved performance. Due to the small volume andthe resulting low self-capacitance, each single nanoparticle exhibits a highcharging energy. Thus, a Coulomb-energy gap emerges during transportexperiments that can be shifted by electric fields, allowing for chargetransport whenever energy levels of neighboring particles match. Hence, thestate of the device changes sequentially between conducting and non-conductinginstead of just one transition from conducting to pinch-off as insemiconductors. To exploit this behavior for field-effect transistors, it isnecessary to use uniform nanoparticles in ordered arrays separated bywell-defined tunnel barriers. In this work, CoPt nanoparticles with a narrowsize distribution are synthesized by colloidal chemistry. These particles aredeposited via the scalable Langmuir-Blodgett technique as ordered, homogeneousmonolayers onto Si/SiO2 substrates with pre-patterned gold electrodes. Theresulting nanoparticle arrays are limited to stripes of adjustable lengths andwidths. In such a defined channel with a limited number of conduction paths thecurrent can be controlled precisely by a gate voltage. Clearly pronouncedCoulomb oscillations are observed up to temperatures of 150 K. Using suchsystems as field-effect transistors yields unprecedented oscillating currentmodulations with on/off-ratios of around 70 %.

Coulomb blockade based field-effect transistors exploiting stripe-shaped channel geometries of self-assembled metal nanoparticles