Abstract
To test the applicability of the friction model to the vibrational damping of adsorbed molecules via the excitation of electron–hole pairs, the change in DC resistivity induced by C60 adsorption onto polycrystalline noble metal films (Au, Cu, and Ag) was measured. The friction coefficients were found to be 1.1×1010, 1.7×1010, and 2.8×1010 s-1 for C60/Au, C60/Ag, and C60/Cu systems, respectively. The obtained friction coefficients increase in the order Au, Ag, and Cu; the order correlates with the charge transfer effect across C60/noble metal interfaces. The values deduced from the resistivity data were ten times higher than that predicted by the friction model, indicating that the friction model is not appropriate for obtaining accurate estimations in cases of the adsorption of rather heavy molecules such as C60.
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