Chemical Bonding of Fullerene and Fluorinated Fullerene on Bare and Hydrogenated Diamond

We investigate the interface between a C₆₀ fullerite film, C₆₀F₃₆, and diamond (100) by using core‐level photoemission spectroscopy, cyclic voltammetry (CV), and high‐resolution electron energy loss spectroscopy (HREELS). We show that C₆₀ can be covalently bonded to reconstructed C(100)‐2×1 and that the bonded interface is sufficiently robust to exhibit characteristic C₆₀ redox peaks in solution. The bare diamond surface can be passivated against oxidation and hydrogenation by covalently bound C₆₀. However, C₆₀F₃₆ is not as stable as C₆₀ and desorbs below 300 °C (the latter species being stable up to 500 °C on the diamond surface). Neither C₆₀ fullerite nor C₆₀F₃₆ form reactive interfaces on the hydrogenated surface—they both desorb below 300 °C. The surface transfer doping process of hydrogenated diamond by C₆₀F₃₆ is the most evident one among all the adsorbate systems studied (with a coverage‐dependent band bending induced by C₆₀F₃₆)_.