MESOSCOPIC ELASTIC PROPERTIES OF CLUSTER-ASSEMBLED CARBON-FILMS

The mesoscopic elastic response of cluster-assembled carbon films was measured by Brillouin light scattering. The values of bulk modulus and shear modulus were estimated from the shifts of both surface and bulk phonon peaks. The most basic mechanical properties of these new mater ials were so investigated down to the scale of a few hundreds of nanom eters. The shear modulus is found in the range of that of crystalline graphite, whereas the bulk modulus and Poisson's ratio are significant ly different. The results agree with the mainly sp(2) coordinated gran ular structure shown by Raman spectroscopy.