Raman spectroscopy of single-walled carbon nanotubes at high pressure: Effect of interactions between the nanotubes and pressure transmitting media

摘要

We have studied single-walled carbon nanotubes (SWNT) at high pressure using Raman spectroscopy, in a variety of common solvents as hydrostatic pressure-transmitting media. We find that the response of the Raman G-band to high pressure varies significantly with choice of solvent. In particular, with hexane we observe a new irreversible effect - a flat Raman response to 0.7 GPa. We draw tentative conclusions from this work - that the solvents used can penetrate the interstitial spaces between nanotubes in a bundle and, following the approach of Amer et al. [1], that absorption of the pressure-transmitting media plays a role in the response of the SWNTs to high pressure. (C) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.