In order to investigate the strong catalytic activities of Cu nanoparticles, we have measured the electronic states of oxygen and carbon monoxide-exposed Cu nanoparticles on the rutile TiO₂(110) surfaces by synchrotron radiation photoelectron spectroscopy. After depositing Cu on the oxygen rich TiO₂(110) (O-TiO₂) surface, the Ti 3d state appeared due to the disappearance of the oxygen adatoms by reaction with Cu. After further oxygen exposure, Cu 3d state drastically changed. This result indicates that Cu₂O is formed by oxidation of Cu nanoparticles. We then dosed a CO gas onto the oxidized Cu/O-TiO₂(110) surface and found that the work function slightly decreases and elimination of O adatoms is confirmed by medium energy ion scattering. These results obtained clearly shows the reaction of CO with O adatoms adsorbed on Cu/TiO₂ probably to form CO₂.

为了研究铜纳米颗粒的强催化活性，我们通过同步辐射光电子能谱测量了金红石 TiO ₂ (110) 表面上暴露于氧和一氧化碳的铜纳米颗粒的电子态。在富氧 TiO ₂ (110) (O-TiO ₂ ) 表面沉积 Cu 后，由于与 Cu 反应氧吸附原子消失，Ti 3 d态出现。进一步暴露于氧气后，Cu 3 d状态发生了巨大变化。该结果表明Cu ₂ O是由Cu纳米颗粒氧化形成的。然后我们将 CO 气体加入到氧化的 Cu/O-TiO _{2 上}(110) 表面，发现功函数略有下降，中能离子散射证实了 O 吸附原子的消除。获得的这些结果清楚地表明CO与吸附在Cu/TiO ₂上的O吸附原子反应可能形成CO ₂。