Identification of adsorbed molecules via STM tip manipulation: CO, H₂O, and O₂ on TiO₂ anatase (101)

Setvin, Martin; Daniel, Benjamin; Aschauer, Ulrich Johannes; Hou, Weiyi; Li, Ye-Fei; Schmid, Michael; Selloni, Annabella; Diebold, Ulrike (2014). Identification of adsorbed molecules via STM tip manipulation: CO, H₂O, and O₂ on TiO₂ anatase (101). Physical Chemistry Chemical Physics, 16(39), pp. 21524-21530. Royal Society of Chemistry 10.1039/c4cp03212h

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While Scanning Tunneling Microscopy (STM) has evolved as an ideal tool to study surface chemistry at the atomic scale, the identification of adsorbed species is often not straightforward. This paper describes a way to reliably identify H2O, CO and O2 on the TiO2 anatase (101) surface with STM. These molecules are of a key importance in the surface chemistry of this and many other (photo-) catalytic materials. They exhibit a wide variety of contrasts in STM images, depending on the tip condition. With clean, metallic tips the molecules appear very similar, i.e., as bright, dimer-like features located in the proximity of surface Ti5c atoms. However, each species exhibits a specific response to the electric field applied by the STM tip. It is shown that this tip–adsorbate interaction can be used to reliably ascertain the identity of such species. The tip–adsorbate interactions, together with comparison of experimental and calculated STM images, are used to analyse and revisit the assignments of molecular adsorbed species reported in recent studies.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Aschauer, Ulrich Johannes

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry
500 Science > 530 Physics

ISSN:

1463-9076

Publisher:

Royal Society of Chemistry

Language:

English

Submitter:

Ulrich Johannes Aschauer

Date Deposited:

12 Jan 2016 16:47

Last Modified:

20 Sep 2016 21:02

Publisher DOI:

10.1039/c4cp03212h

BORIS DOI:

10.7892/boris.72984

URI:

https://boris.unibe.ch/id/eprint/72984

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