Acetic Acid Adsorption on Anatase TiO2(101)

作者：Grinter David C; Nicotra Marco; Thornton Geoff^*

来源：Journal of Physical Chemistry C, 2012, 116(21): 11643-11651.

DOI：10.1021/jp303514g

The adsorption and reactivity of acetic acid on anatase TiO2(101) has been investigated with scanning tunneling microscopy (STM). At low coverage, acetic acid is observed to have a characteristic appearance in STM consistent with a dissociative bidentate binding geometry. At room temperature acetic acid has a relatively strong interaction with the anatase (101) surface and a near-unity sticking probability. When deposited at elevated temperatures (420 K), a saturated coverage displays a partially ordered superstructure with two domains across small regions of the anatase surface. The periodicity of these domains was found to be (2 X 1), again consistent with a bidentate binding geometry of the acetate to two neighboring Ti-5c sites along the [010] direction. Heating the acetate-covered surface to 570 K in ultrahigh vacuum resulted in clean desorption of similar to 90% of the molecules, leaving only a small fraction undesorbed that were mainly situated at the step edges of the anatase. STM tip pulsing of +6 V was also found to desorb acetate molecules from the surface.

• 出版日期2012-5-31