Namai Yoshimichi, Matsuoka Osamu
J Phys Chem B. 2006 Apr 6;110(13):6451-3. doi: 10.1021/jp068012f.
We succeeded in observing the atomic scale structure of a rutile-type TiO2(110) single-crystal surface prepared by the wet chemical method of chemical etching in an acid solution and surface annealing in air. Ultrahigh vacuum noncontact atomic force microscopy (UHV-NC-AFM) was used for observing the atomic scale structures of the surface. The UHV-NC-AFM measurements at 450 K, which is above a desorption temperature of molecularly adsorbed water on the TiO2(110) surface, enabled us to observe the atomic scale structure of the TiO2(110) surface prepared by the wet chemical method. In the UHV-NC-AFM measurements at room temperature (RT), however, the atomic scale structure of the TiO2(110) surface was not observed. The TiO2(110) surface may be covered with molecularly adsorbed water after the surface was prepared by the wet chemical method. The structure of the TiO2(110) surface that was prepared by the wet chemical method was consistent with the (1 x 1) bulk-terminated model of the TiO2(110) surface.
我们成功地观察到了通过在酸性溶液中化学蚀刻的湿化学方法以及在空气中进行表面退火制备的金红石型TiO₂(110)单晶表面的原子尺度结构。利用超高真空非接触原子力显微镜（UHV-NC-AFM）来观察该表面的原子尺度结构。在450 K下进行的UHV-NC-AFM测量，该温度高于TiO₂(110)表面分子吸附水的解吸温度，这使我们能够观察到通过湿化学方法制备的TiO₂(110)表面的原子尺度结构。然而，在室温（RT）下进行的UHV-NC-AFM测量中，未观察到TiO₂(110)表面的原子尺度结构。通过湿化学方法制备的TiO₂(110)表面在制备后可能被分子吸附水覆盖。通过湿化学方法制备的TiO₂(110)表面的结构与TiO₂(110)表面的(1×1)体相终止模型一致。
