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

Summary, in English

Nickel oxide (NiO), deposited onto the strontium titanate (SrTiO3) (110)-(4 X 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 X 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.

• Author: Stefan Gerhold; Michele Riva; Zhiming Wang; Roland Bliem; Margareta Wagner; Jacek Osiecki; Karina Schulte; Michael Schmid; Ulrike Diebold
• Department/s: MAX IV Laboratory
• Publishing year: 2015
• Language: English
• Pages: 20481-20487
• Publication/Series: Journal of Physical Chemistry C
• Volume: 119
• Issue: 35
• Links: http://dx.doi.org/10.1021/acs.jpcc.5b06144
• Document type: Journal article
• Publisher: The American Chemical Society (ACS)
• Topic: Physical Chemistry
• Status: Published
• ISBN/ISSN/Other: ISSN: 1932-7447