Catalysis Research Center, Hokkaido University, Kita-ku N21W10, Sapporo, Hokkaido 001-0021, Japan.
Langmuir. 2010 Nov 2;26(21):16392-6. doi: 10.1021/la102013a.
We studied the methanol adsorption behavior of Pt nanoparticles that were vacuum-deposited on a TiO(2)(110) surface at room temperature by using an ultrahigh vacuum (UHV) scanning tunneling microscope (STM). A large number of bright spots were observed on fivefold-coordinated Ti (Ti(5c)) rows of the TiO(2)(110) surface after exposure of the Pt/TiO(2)(110) to methanol vapor. We assigned the bright spots to methoxy species. These were mobile and were found to hop along the Ti(5c) rows. In situ time-resolved STM observations of the formation and migration of the bright spots on the Pt/TiO(2)(110) were carried out in the presence of methanol. The bright spots were produced at the periphery of the Pt nanoparticles and migrated to the substrate Ti(5c) rows. We discuss the spillover process and behavior of the methoxy species on the Pt/TiO(2)(110).
我们通过使用超高真空（UHV）扫描隧道显微镜（STM）研究了在室温下真空沉积在 TiO(2)(110) 表面上的 Pt 纳米粒子的甲醇吸附行为。将 Pt/TiO(2)(110) 暴露于甲醇蒸气后，在 TiO(2)(110) 的五配位 Ti（Ti(5c)）行上观察到大量亮斑。我们将亮斑分配给甲氧基物种。这些亮斑是可移动的，并且被发现沿着 Ti(5c) 行跳跃。在甲醇存在下，我们对 Pt/TiO(2)(110) 上亮斑的形成和迁移进行了原位时间分辨 STM 观察。亮斑在 Pt 纳米粒子的外围产生，并迁移到基片 Ti(5c) 行上。我们讨论了 Pt/TiO(2)(110) 上甲氧基物种的溢出过程和行为。
