Abstract
Stearic-acid films have been deposited on single-crystalline TiO2(110) substrates by vacuum evaporation. No changes are seen in atomic-force microscope (AFM) topographic images of the stearic-acid films after a scan at a bias voltage of -10 to 10 V in the dark. Similarly, ultraviolet irradiation at bias voltage < 0.0 V brings about no changes in the AFM topographic images. In contrast, a rectangular hole with a size of 200 nm×200 nm is formed in the stearic-acid film after a scan at 10 V under ultraviolet irradiation. No current flows on the stearic-acid film, whereas an appreciable current flows at -2.0 V at the rectangular hole. Photocatalytic decomposition of the stearic-acid films deposited on the TiO2(110) substrates occurs at the area in which a bias voltage of 10 V is applied. The letters “YT” with a line width of 30 nm are drawn in the stearic-acid film by AFM-based photocatalysis.
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