Orientation dependence of the polarizability of an individual WS2 nanotube by resonant Raman spectroscopy -: art. no. 205436

We obtained a Raman signal from an individual WS2 nanotube mounted on an atomic force microscopy cantilever tip. We discuss the implications for simultaneous investigations of the mechanical properties of WS2 nanotubes by combining different experimental methods. From the orientation dependence of this nanotube's resonant Raman intensity, we estimate the ratio of the perpendicular to parallel polarizabilities alpha(XX)/alpha(ZZ)approximate to 0.16. We compare the WS2 nanotube with single-walled carbon nanotubes and expect a similarly strong depolarization effect for multiwalled carbon nanotubes.