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Ordered Carboxylates on TiO (110) Formed at Aqueous Interfaces

Grinter, DC; Woolcot, T; Pang, C-L; Thornton, G; (2014) Ordered Carboxylates on TiO (110) Formed at Aqueous Interfaces. The Journal of Physical Chemistry Letters , 5 (24) 4265 - 4269. 10.1021/jz502249j. Green open access

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Abstract

As models for probing the interactions between TiO2 surfaces and the dye molecules employed in dye-sensitized solar cells, carboxylic acids are an important class of molecules. In this work we present a scanning tunneling microscopy (STM) and low energy electron diffraction (LEED) study of three small carboxylic acids (formic, acetic, and benzoic) that were reacted with the TiO2(110) surface via a dipping procedure. The three molecules display quite different adsorption behavior, illustrating the different inter-adsorbate interactions that can occur. After exposure to a 10 mM solution, formic acid forms a rather disordered formate overlayer with two distinct binding geometries. Acetic acid forms a well-ordered (2 × 1) acetate overlayer similar to that observed following deposition from vapor. Benzoic acid forms a (2 × 2) overlayer which is stabilized by intermolecular interactions between the phenyl groups.

Type: Article
Title: Ordered Carboxylates on TiO (110) Formed at Aqueous Interfaces
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/jz502249j
Publisher version: http://dx.doi.org/10.1021/jz502249j
Language: English
Additional information: ACS AuthorChoice - This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Keywords: Formic, acetic, benzoic, acid, dipping, STM
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/1457380
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