A TPD-MS study of glassy carbon surfaces oxidized by CO_2 and O_2

摘要

The temperature-programmed desorption (TPD) method combined with mass speetrometric (MS) analysis has been applied to investigate the surface properties of carbon materials. The apparatus consisting of a temperature-programmed furnace and a quadrupole mass spectrometer was constructed in order to characterize the surface of differently treated glassy carbon samples. In this work, samples of glassy carbon exposed to air, CO_2 and O_2 were examined. The desorption of H_2O, CO and CO_2, as major products, indicated the presence of different oxide groups. The amount of these groups for all samples was calculated. It is concluded that oxidation affects the nature and the amount of the surface oxide groups and contributes to their increased stability.