Photocatalysis on TiO2 surfaces investigated by atomic force microscopy:: Photodegradation of partial and full monolayers of stearic acid on TiO2(110)

被引：58

作者：

Sawunyama, P

Fujishima, A

Hashimoto, K

机构：

[1] Univ Tokyo, Dept Appl Chem, Bunkyo Ku, Tokyo 1138656, Japan

[2] Kanagawa Acad Sci & Technol, Atsugi, Kanagawa 2430297, Japan

[3] Univ Tokyo, Adv Sci & Technol Res Ctr, Meguro Ku, Tokyo 1538904, Japan

来源：

LANGMUIR | 1999年 / 15卷 / 10期

关键词：

D O I：

10.1021/la9814440

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We have studied the nature and surface morphological changes associated with the photodegradation of stearic acid LB films on TiO2(110). Interestingly, submonolayers of stearic acid consisted of circular domains of various sizes-a feature very attractive for monitoring TiO2 photocatalysis by AFM. We noted that there was no bulk differential reactivity at island edges compared to the interior. This suggests that the rate of photodegradation of the stearic acid molecules is independent of their location in the island. Accordingly, the overall surface reactivity trends were similar for both partial films and complete films. Likewise, the observed inhomogeneous reactivity patterns appear to be a reflection of the transient distribution of the reaction centers.

引用

页码：3551 / 3556

页数：6

共 44 条

[1]

ADAMSON AW, 1997, PHYSICAL CHEM SURFAC, pCH4

[2]

BAHNEMANN D, 1994, AQUATIC AND SURFACE PHOTOCHEMISTRY, P261

[3] Organic reactions at well-defined oxide surfaces [J].