• Degenhardt, Anna Katharina
• Kulisch, Wilhelm
• Baio, Joe E.
• Siemeling, Ulrich
• Kopnarski, Michael
• Merz, Rolf
• Weidner, Tobias
• Popov, Cyril
• Reithmaier, Johann Peter
• Reintanz, Philipp M.
• Petkov, Christo

Abstract

<p>Phthalocyanine (Pc) derivatives containing different central metal atoms (Mn, Cu, Ti) and different peripheral chains were synthesized and comprehensively characterized. Their interaction with nanocrystalline diamond (NCD) films, as-grown by hot-filament chemical vapor deposition or after their modification with oxygen plasma to exchange the hydrogen termination with oxygen-containing groups, was studied by X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. The elemental composition as determined by XPS showed that the Pc were grafted on both as-grown and O-terminated NCD. Mn, Cu and Ti were detected together with N stemming from the Pc ring and S in case of the Ti-Pc from the peripheral ligands. The results for the elemental surface composition and the detailed study of the N 1s, S 2p and O 1s core spectra revealed that Ti-Pc grafted better on as-grown NCD but Cu-Pc and Mn-Pc on O-terminated films. Samples of Mn-Pc on as-grown and O-terminated NCD were further investigated by NEXAFS spectroscopy. The results showed ordering of the grafted molecules, laying flat on the H-terminated NCD surface while only the macrocycles were oriented parallel to the O-terminated surface with the peripheral chains perpendicular to it.</p>

Topics

• surface
• x-ray photoelectron spectroscopy
• Oxygen
• Hydrogen
• functionalization
• chemical vapor deposition
• near-edge X-ray absorption fine structure spectroscopy