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Dynamic Equilibrium at the HCOOH-Saturated TiO$_{2}$(110)-Water Interface


Brandalise Nunes, Fernanda; Comini, Nicolò; Diulus, John Trey; Huthwelker, Thomas; Iannuzzi, Marcella; Osterwalder, Jürg; Novotny, Zbynek (2023). Dynamic Equilibrium at the HCOOH-Saturated TiO$_{2}$(110)-Water Interface. Journal of Physical Chemistry Letters, 14(13):3132-3138.

Abstract

Carboxylic acids bind to titanium dioxide (TiO$_{2}$) dissociatively, forming surface superstructures that give rise to a (2 × 1) pattern detected by low-energy electron diffraction. Exposing this system to water, however, leads to a loss of the highly ordered surface structure. The formate-covered surface was investigated by a combination of diffraction and spectroscopy techniques, together with static and dynamic ab initio simulations, with the conclusion that a dynamic equilibrium exists between adsorbed formic acid and water molecules. This equilibrium process is an important factor for obtaining a better understanding of controlling the self-cleaning properties of TiO$_{2}$, because the formic acid monolayer is responsible for the amphiphilic character of the surface.

Abstract

Carboxylic acids bind to titanium dioxide (TiO$_{2}$) dissociatively, forming surface superstructures that give rise to a (2 × 1) pattern detected by low-energy electron diffraction. Exposing this system to water, however, leads to a loss of the highly ordered surface structure. The formate-covered surface was investigated by a combination of diffraction and spectroscopy techniques, together with static and dynamic ab initio simulations, with the conclusion that a dynamic equilibrium exists between adsorbed formic acid and water molecules. This equilibrium process is an important factor for obtaining a better understanding of controlling the self-cleaning properties of TiO$_{2}$, because the formic acid monolayer is responsible for the amphiphilic character of the surface.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > General Materials Science
Physical Sciences > Physical and Theoretical Chemistry
Language:English
Date:23 March 2023
Deposited On:24 Nov 2023 08:37
Last Modified:29 Jun 2024 01:40
Publisher:American Chemical Society (ACS)
ISSN:1948-7185
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1021/acs.jpclett.2c03788
  • Content: Published Version
  • Language: English
  • Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)