ELECTRONIC STATES OF MONOLAYER MICROGRAPHITE ON TIC(111)-FACETED AND TIC(410) SURFACES

The monolayer micrographite films, of which the lateral dimensions are in the order of nanometer, have been grown on TiC(111)-faceted and Ti C(410) surfaces by chemical vapor deposition. Diffraction spots due to the graphite lattice have been observed for TiC(111)-faceted surfaces , but not for (410). Angle-resolved ultraviolet photoelectron spectros copy (ARUPS) spectra of micrographite on the faceted surface have show n a series of peaks due to the rr states of graphite. On the (410) sur face, quantized rr branches of graphite ribbon with the narrow terrace of 0.886 nm appeared. Any other state characteristics of the microgra phite, such as edge state near Fermi level, was not observed for both systems. (C) 1998 Elsevier Science B.V. All rights reserved.