The effect of Ar+ irradiation on the electronic structure of highly oriented pyrolytic graphite was examined by Xray photoelectron spectroscopy. The valence band and corevalencevalence Auger lines, were investigated. The use of the second derivative of these spectral regions allowed the identification of the main spectral components of the density of state (DOS). A comparison of the virginand the irradiatedgraphite double differentiated spectra enabled us to follow the effect of the Ar+ bombardment on the DOS components. A new interpretation of the electron rearrangement in the irradiated graphite and a comparison with those from amorphous carbon films are given. Based on our results we suggest the use irradiated graphite as a standard for the quantification of sp2 sp3 hybrids in Cbased materials.
Effects of irradiation on the graphite Density of States analyzed via photoelectron spectroscopy
Speranza, Giorgio;Minati, Luca
2008-01-01
Abstract
The effect of Ar+ irradiation on the electronic structure of highly oriented pyrolytic graphite was examined by Xray photoelectron spectroscopy. The valence band and corevalencevalence Auger lines, were investigated. The use of the second derivative of these spectral regions allowed the identification of the main spectral components of the density of state (DOS). A comparison of the virginand the irradiatedgraphite double differentiated spectra enabled us to follow the effect of the Ar+ bombardment on the DOS components. A new interpretation of the electron rearrangement in the irradiated graphite and a comparison with those from amorphous carbon films are given. Based on our results we suggest the use irradiated graphite as a standard for the quantification of sp2 sp3 hybrids in Cbased materials.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
