Mesoscopic elastic properties of cluster-assembled carbon films
INFM-Dipartimento di Ingegneria Nucleare, Politecnico
di Milano, Via Ponzio 34/3, 20133-Milano, Italy
2 INFM-Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria 16, 20133-Milano, Italy
Accepted: 26 March 1998
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 materials were so investigated down to the scale of a few hundreds of nanometers. The shear modulus is found in the range of that of crystalline graphite, whereas the bulk modulus and Poisson's ratio are significantly different. The results agree with the mainly sp2 coordinated granular structure shown by Raman spectroscopy.
PACS: 61.46.+w – Clusters, nanoparticles, and nanocrystalline materials / 68.60.Bs – Mechanical and acoustical properties / 78.35.+c – Brillouin and Rayleigh scattering; other light scattering
© EDP Sciences, 1998