Recent nanofriction experiments of xenon on graphene revealed that the slip onset can be induced by increasing the adsorbate coverage above a critical value, which depends on temperature. Moreover, the xenon slippage on gold is much higher than on graphene in spite of the same physical nature of the interactions. To shed light on these intriguing results we have performed molecular dynamics simulations relying on ab initio derived potentials. By monitoring the interfacial structure factor as a function of coverage and temperature, we show that the key mechanism to interpret the observed frictional phenomena is the size-dependence of the island commensurability. The latter quantity is deeply affected also by the lattice misfit, which explains the different frictional behavior of Xe on graphene and gold.

Size-dependent commensurability and its possible role in determining the frictional behavior of adsorbed systems / Restuccia, Paolo; Ferrario, Mauro; Sivestrelli, Pier Luigi; Mistura, Giampaolo; Righi, Maria Clelia. - In: PHYSICAL CHEMISTRY CHEMICAL PHYSICS. - ISSN 1463-9076. - 18:41(2016), pp. 28997-29004. [10.1039/C6CP05386F]

Size-dependent commensurability and its possible role in determining the frictional behavior of adsorbed systems

RESTUCCIA, PAOLO;FERRARIO, Mauro;RIGHI, Maria Clelia
2016

Abstract

Recent nanofriction experiments of xenon on graphene revealed that the slip onset can be induced by increasing the adsorbate coverage above a critical value, which depends on temperature. Moreover, the xenon slippage on gold is much higher than on graphene in spite of the same physical nature of the interactions. To shed light on these intriguing results we have performed molecular dynamics simulations relying on ab initio derived potentials. By monitoring the interfacial structure factor as a function of coverage and temperature, we show that the key mechanism to interpret the observed frictional phenomena is the size-dependence of the island commensurability. The latter quantity is deeply affected also by the lattice misfit, which explains the different frictional behavior of Xe on graphene and gold.
2016
18
41
28997
29004
Size-dependent commensurability and its possible role in determining the frictional behavior of adsorbed systems / Restuccia, Paolo; Ferrario, Mauro; Sivestrelli, Pier Luigi; Mistura, Giampaolo; Righi, Maria Clelia. - In: PHYSICAL CHEMISTRY CHEMICAL PHYSICS. - ISSN 1463-9076. - 18:41(2016), pp. 28997-29004. [10.1039/C6CP05386F]
Restuccia, Paolo; Ferrario, Mauro; Sivestrelli, Pier Luigi; Mistura, Giampaolo; Righi, Maria Clelia
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1118309
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