Picaud F, Langlet R, Girardet C
Laboratoire de Physique Moléculaire, UMR 6624, Faculté des Sciences, La Bouloie, Université de Franche-Comté, F25030 Besançon Cedex, France.
J Chem Phys. 2006 Oct 28;125(16):164708. doi: 10.1063/1.2360271.
A semicontinuum approach on the basis of an effective polarizability tensor per length and radius units is used to describe the dielectric response of a long single wall nanotube to the adsorption of an extended molecule. Changes in the permittivity ratio of the nanotube+molecule over the nanotube alone, which are directly connected to frequency shifts of the nanotube in a resonator configuration due to the presence of the molecule, provide a test of sensitivity of the system. The behavior of this ratio is analyzed for linear and circular geometries of the molecule, as a function of the tube characteristics (length and radius) and of the molecular size and polarizability distribution. Extension to three dimensional systems with a large set of polarizable centers is discussed in terms of self-polarization of the centers and morphology of the surface of the sensed system.
