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continuous electron energy spectrum of the particles. 2 In this paper, we report on the observation of SET in nanometer coated metal colloid particles. We also describe the preparation of the smallest silicon dioxide (SiO2)-coated (Au@SiO2) and thiol-coated gold colloid particles. The work reported here is an experiment in which the measured SET signals are unambiguously shown to be associated with a particular single particle. We have also identified the region on the particle where the SET signals originate. Nonlinear processes occurring in the electron transport give rise to well-defined SET signals at room temperature. A possible explanation for the nonlinearity in terms of many-body excitation is given. Thus, our SET signals are suitable for roomtemperature device operations. SET is an electron-transport process that occurs in the serial connection of two tunneling junctions, in which the number of excess electrons residing on the central electrode can be varied by varying the biasing voltage across the two outer electrodes. 3,4 If the junction charging energy exceeds

Nonlinear single-electron tunneling through individually coated colloid particles at room temperature