Photoresponse of titanium dioxide surface on atomic scale: Site for visible light absorption

被引:9
作者
Komiyama, M [1 ]
Li, YJ [1 ]
机构
[1] Yamanashi Univ, Grad Sch Med & Engn, Kofu, Yamanashi 4008511, Japan
来源
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 2004年 / 43卷 / 7B期
关键词
titanium dioxide; titania; TiO2 (110); STM; photoexcitation; oxygen deficiency; visible light; photocurrent;
D O I
10.1143/JJAP.43.4584
中图分类号
O59 [应用物理学];
学科分类号
摘要
The local photoresponse of a rutile TiO2(110) surface was visualized on the atomic scale by scanning tunneling microscopy (STM). Almost all the areas on the (110) surface responded to the illumination of 325 nm ultraviolet (UV) light, in accordance with the minimum bulk band-gap (3.2 eV) electron transition. with steps and (1 x 2) ridge areas exhibiting higher response intensities. When the same surface was illuminated with blue light at 442 nm, which is well below the minimum bulk band-gap transition energy, most of the surface areas were dormant, but certain areas at step regions and (I x 2) ridge structures responded to the blue light. These sites are associated with oxygen deficiency on the surface, which may give a clue to the possibility of the surface engineering of a titania photocatalyst to be employed under visible light.
引用
收藏
页码:4584 / 4587
页数:4
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