Abstract
Bundles of ultrathin gold nanowires (Au NWs, 2 nm in diameter) were fabricated and subsequently assembled onto electrodes. Electrical measurements and noise spectroscopy techniques were applied for sample characterization. The peculiarities of noise behavior in the system of bundles of ultrathin gold nanowires were studied. The measured power spectral density of flicker noise was proportional to current squared, which reflects ohmic behavior in NW structures. Lorentzian-shaped components were revealed in the noise spectra. They are suggested to be the result of the participation of molecules adsorbed on the NW surface in transport phenomena. The presence of molecular interfaces was confirmed by high-resolution transmission electron micrographs. The adsorbed molecules play an important role in charge transport and therefore determine electrical and noise properties of the NW structures. The results should be taken into account for the development of NW devices for sensing and molecular electronics applications.
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