Molecular dynamics computer simulations which employ the embedded-atom
potential show that nanowires of gold exist as multishelled structures. We
simulate double-walled gold nanowires and calculate the capacitance of a finite
nanometer-size cylindrical capacitor. For the sizes for which multishelled
nanowires appear in simulations we find the capacitances below one attofarad.Comment: 2 ps and 1 jpg figure