Stabilizing Single Ni Adatoms on a Two-Dimensional Porous Titania Overlayer at the SrTiO3(110) Surface
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- 作者：Zhiming Wang ; Xianfeng Hao ; Stefan Gerhold ; Petr Mares ; Margareta Wagner ; Roland Bliem ; Karina Schulte ; Michael Schmid ; Cesare Franchini ; Ulrike Diebold
- 刊名：Journal of Physical Chemistry C
- 出版年：2014
- 出版时间：August 28, 2014
- 年：2014
- 卷：118
- 期：34
- 页码：19904-19909
- 全文大小：404K
- ISSN：1932-7455
文摘
Nickel vapor-deposited on the SrTiO3(110) surface was studied using scanning tunneling microscopy, photoemission spectroscopy (PES), and density functional theory calculations. This surface forms a (4 脳 1) reconstruction, composed of a 2-D titania structure with periodic six- and ten-membered nanopores. Anchored at these nanopores, Ni single adatoms are stabilized at room temperature. PES measurements show that the Ni adatoms create an in-gap state located at 1.9 eV below the conduction band minimum and induce an upward band bending. Both experimental and theoretical results suggest that Ni adatoms are positively charged. Our study produces well-dispersed single-adatom arrays on a well-characterized oxide support, providing a model system to investigate single-adatom catalytic and magnetic properties.