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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Atom-Resolved Surface Structures and Molecular Adsorption on TiO_2(001) Investigated by Scanning Tunneling Microscopy
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Atom-Resolved Surface Structures and Molecular Adsorption on TiO_2(001) Investigated by Scanning Tunneling Microscopy

机译：扫描隧道显微镜研究TiO_2（001）的原子分辨表面结构和分子吸附

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摘要

Well-ordered surface structure was prepared on a rutile TiO_2(001) surface and investigated on the atomic scale by scanning tunneling microscopy (STM). The surface had a latticework-like structure with rows running along the [110] and [1(1-bar)0] directions. Each row consisted of narrow terraces separated by single-height steps on their slopes at both sides. An added-row structural model that consists of Ti_7O_(12) suboxide row added on each narrow terrace of a {114}-microfacet structure was proposed on the basis of atom-resolved STM images as well as local coordination considerations. The added row had 4-fold coordinated and 5-fold coordinated Ti atoms, each of which was observed as a bright spot in STM images. Formic acid molecules adsorbed on both Ti sites, while methanol adsorbed preferentially on the 4-fold coordinated Ti atoms, which may support the validity of the structural model. The latticework structure was proved to be stable against thermal reactions of formic acid and methanol.
机译：在金红石型TiO_2（001）表面制备了有序的表面结构，并通过扫描隧道显微镜（STM）在原子尺度上进行了研究。该表面具有网格状结构，其中行沿[110]和[1（1-bar）0]方向行进。每行由狭窄的梯田组成，梯田的两侧坡度由单高度台阶分隔。基于原子解析的STM图像以及局部配位考虑，提出了由Ti_7O_（12）次氧化物行添加到{114}-微面结构的每个狭窄平台上组成的附加行结构模型。添加的行具有4倍配位和5倍配位的Ti原子，它们在STM图像中均被视为亮点。甲酸分子吸附在两个Ti位点上，而甲醇优先吸附在4倍配位的Ti原子上，这可能支持结构模型的有效性。晶格结构被证明对甲酸和甲醇的热反应是稳定的。

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