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Photocatalytic Decomposition of Organic Thin Films in a Nanometer-Scale by an Atomic Force Microscope

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Upheavals of adsorbed oxygen molecules are formed on the TiO2 (110) surface by applying a negative bias voltage between the TiO2 and a tip. The heights of upheavals corresponding to the state density of O 2 increase with a bias voltage. The letters "Y T" constructed from O 2 are drawn on the TiO2 surface. The letters have the line width of 22 nm and the height of 6 nm. The letter "T" is selectively deleted by applying a positive voltage under ultraviolet illumination. It is found that the adsorption of O2 and the photodesorption of O 2 are controlled in a nanometer scale. A stearic-acid film deposited on the TiO2 (110) is selectively decomposed at the area where a bias voltage of 10 V is applied under ultraviolet illumination. Using AFM-based photocatalysis, several patterns are formed in a thick stearic-acid film. The letters "Y T" are drawn in the thin stearic-acid film. The spatial resolution of the photocatalytic decomposition is estimated to be 30 nm from a line width of the letters "Y T."
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Keywords: ADSORPTION OF O2; ATOMIC FORCE MICROSCOPE; NANOPATTERNING; PHOTOCATALYSIS; TIO2

Document Type: Research Article

Publication date: June 1, 2009

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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