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Research team of single molecular science, Hefei National Laboratory of microscale materials science, University of science and technology of China revealed that the paper was published in nature communication recently Titanium dioxide, as an oxide semiconductor, is an important material system in the study of solar energy conversion It is expected to be applied in the preparation of organic solar cells, the conversion of solar energy into environmental friendly chemical energy, etc., and has a promising future in photocatalytic decomposition of water to produce hydrogen and artificial photosynthesis The research on this material system has become a hot topic in the field of new energy materials research in the world It is an important scientific issue to find new catalytic materials and efficient energy conversion mechanism Anatase structure and rutile structure of titanium dioxide are two widely studied crystal structures Among them, rutile is easy to grow single crystal because of its stable structure In the past, the research mainly focused on rutile structure of titanium dioxide In comparison, the stability of anatase titanium dioxide is low, and it is intuitively judged that its chemical activity should be higher than rutile structure, which is also supported by many theoretical calculations In particular, it is theoretically predicted that the anatase titanium dioxide with a surface index of (001) has the highest activity among all the crystal surfaces In recent years, a large number of material scientists have been engaged in the synthesis of (001) - rich anatase titania nanocrystals and the study of their photocatalytic properties However, the experimental photocatalytic efficiency is quite different from the theoretical prediction
In order to solve this problem, Professor Wang Bing et al Prepared high-quality titanium dioxide on the surface of anatase structure (001) by pulse laser deposition technology By means of scanning tunneling microscopy (STM) micro characterization and atom manipulation, the structure and chemical reaction activity of the surface were clearly revealed Combined with the theoretical calculation and analysis of Professor Zhao Jin et al In the laboratory, a new method was proposed The surface structure model clarifies the long-term debate on the surface defect structure and chemical reaction activity.