Study of the polarizability of Mlerenes with a monopole-dipole interaction model

摘要

Static dielectric properties of some fullerenes and fullerene-based molecules are studied using a Gaussian renormalized monopole-dipole interaction model. Many kinds of molecules have been constructed on the computer: Mlerenes with icosahedral shape, Stone-Wales rounded Mlerenes, and carbon onions constructed with these two types of Mlerenes. The geometry optimization has been performed with the second-generation reactive empirical bond order potential energy [D.W. Brenner, J. Phys. Condens. Matter 14 (2002) 783]. As expected, the molecular polarizability of spherical and icosahedral Mlerenes is found to vary linearly with the cube of their mean radius. The contribution of internal layers in multi-shell onions is very small due to a strong screening. The presence of defects in spherical Mlerenes decreases the atomic density and the screening effects between atoms, which yields a slight increase of the dielectric response. Some examples of peanut-shape Mlerenes, which have been observed experimentally, are also considered.