期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 14, 期 13, 页码 3132-3138出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.2c037883132
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Carboxylic acids dissociatively bind to titanium dioxide (TiO2), forming surface superstructures detected by low-energy electron diffraction. However, exposure to water disrupts the ordered surface structure. Investigation of the formate-covered surface using diffraction, spectroscopy, and ab initio simulations reveals a dynamic equilibrium between adsorbed formic acid and water molecules. This equilibrium process is crucial for understanding the self-cleaning properties of TiO2, as the formic acid monolayer contributes to the surface's amphiphilic character.
Carboxylic acids bind to titanium dioxide (TiO2) dissociatively, forming surface superstructures that give rise to a (2 x 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 TiO2,because the formic acid monolayer is responsible for the amphiphilic character of the surface.
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