The bucky papers were then exposed to a plasma environment within the Vacutech RIE system using either SF6 at 20 sscm flow rate or CF4 at 40 sccm flow rate as the plasma gas. The samples were exposed to the plasma for 1 min at different bias voltages to determine the effect of bias on the subsequent bonding of fluorine to the SWNTs. The chemical attachments were investigated by X-ray Photoelectron spectroscopy2 (XPS) using a monochromatic Al(Kα)=1486.6 eV source. The F1s peaks have also been studied with emphasis on the binding energy, using XPS Peak software whereby subtraction of a linear background is performed and Gaussian curves are fitted to the measured data. Attention has been paid to the relative concentrations of fluorine to carbon and oxygen to carbon and after subtraction of a linear background and with use of AlWagner coefficients in the Avantage data system, both 2 days after the initial functionalisation and also after 4 weeks. The AlWagner coefficients are used to limit any possible atomic percentage errors which may occur due to the sample preparation and positioning in the XPS equipment.