Force and energy dissipation variations in non-contact atomic force spectroscopy on composite carbon nanotube systems

Details Force and energy dissipation variations in non-contact atomic force spectroscopy on composite carbon nanotube systems Force and energy dissipation variations in non-contact atomic force spectroscopy on composite carbon nanotube systems

2005-04-30

arxiv.org/abs/cond-mat/0505010v1

Physics

Condensed Matter

Materials Science

22 pages, 6 figures

Scientific paper

10.1103/PhysRevB.74.235418

UHV dynamic force and energy dissipation spectroscopy in non-contact atomic force microscopy were used to probe specific interactions with composite systems formed by encapsulating inorganic compounds inside single-walled carbon nanotubes. It is found that forces due to nano-scale van der Waals interaction can be made to decrease by combining an Ag core and a carbon nanotube shell in the Ag@SWNT system. This specific behaviour was attributed to a significantly different effective dielectric function compared to the individual constituents, evaluated using a simple core-shell optical model. Energy dissipation measurements showed that by filling dissipation increases, explained here by softening of C-C bonds resulting in a more deformable nanotube cage. Thus, filled and unfilled nanotubes can be discriminated based on force and dissipation measurements. These findings have two different implications for potential applications: tuning the effective optical properties and tuning the interaction force for molecular absorption by appropriately choosing the filling with respect to the nanotube.

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