Nickel-Oxide-Modified SrTiO3(110)-(4 脳 1) Surfaces and Their Interaction with Water

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• 作者：Stefan Gerhold ; Michele Riva ; Zhiming Wang ; Roland Bliem ; Margareta Wagner ; Jacek Osiecki ; Karina Schulte ; Michael Schmid ; Ulrike Diebold
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：September 3, 2015
• 年：2015
• 卷：119
• 期：35
• 页码：20481-20487
• 全文大小：411K
• ISSN：1932-7455

文摘

Nickel oxide (NiO), deposited onto the strontium titanate (SrTiO₃) (110)-(4 脳 1) surface, was studied using photoemission spectroscopy (PES), X-ray absorption near edge structure (XANES), and low-energy He⁺ ion scattering (LEIS), as well as scanning tunneling microscopy (STM). The main motivation for studying this system comes from the prominent role it plays in photocatalysis. The (4 脳 1) reconstructed SrTiO₃(110) surface was previously found to be remarkably inert toward water adsorption under ultrahigh-vacuum conditions. Nickel oxide grows on this surface as patches without any apparent ordered structure. PES and LEIS reveal an upward band bending, a reduction of the band gap, and reactivity toward water adsorption upon deposition of NiO. Spectroscopic results are discussed with respect to the enhanced reactivity toward water of the NiO-loaded surface.