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We report on the electric measurements of an individual Au nanoparticle withan ultra-high contact resistance of about $10^{19} \Omega$. The high-impedancemeasurements have been carried out by counting the electrons that aretransferred onto the particle. In order to do this, a carbon nanotube is usedas the electrode for the supply of electrons but also as the detector of thecharge transfer. Measurements using single-electron detection allow us todetermine the separation between the electron states in the Au nanoparticle,which is about 4 meV, consistent with the charging energy of the particle.Single-electron detection with nanotubes offers great promise for the study ofelectron transfer in highly resistive molecular systems.

Counting and manipulating single electrons using a carbon nanotube transistor