Polarity driven morphology of CeO_2(100) islands on Cu(111)

O. Stetsovych; J. Beran; F. Dvorak; K. Masek; J. Myslivecek; V. Matolin

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Polarity driven morphology of CeO_2(100) islands on Cu(111)

机译：Cu（111）上CeO_2（100）岛的极性驱动形态

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Thin ceria films supported by metal substrates represent important model systems for reactivity studies in heterogeneous catalysis. Here we report the growth study of the polar CeO_2(100) phase as part of a mixed CeO_2(111 )-CeO_2(100) thin film supported by Cu(111). The two ceria phases grow on different areas of the substrate, what allows a reliable growth characterization of the CeO_2(100) islands on Cu(111). Scanning tunneling microscopy measurements reveal CeO_2 (100) to grow in the form of highly dispersed three dimensional (3D) islands on a CeO_2(100) interfacial layer. The CeO_2(100) islands exhibit a 2 ×2 surface reconstruction. The presence of the surface reconstruction together with the highly dispersed growth of CeO_2(100) islands corresponds to the requirement for compensation of the surface dipole moment on the CeO_2(100). CeO_2(100) islands are further characterized by reflection high energy electron diffraction yielding their epitaxial relations with respect to the Cu(111) substrate. The growth of well characterized CeO_2(100) islands supported by Cu(111) represents a starting point for developing a novel template for structure-related reactivity studies of ceria based model catalysts.

机译：由金属基质支撑的氧化铈薄膜代表了多相催化反应研究的重要模型系统。在这里，我们报告了作为由Cu（111）支撑的混合CeO_2（111）-CeO_2（100）薄膜的一部分的极性CeO_2（100）相的生长研究。这两个二氧化铈相在衬底的不同区域上生长，从而可以可靠地表征Cu（111）上的CeO_2（100）岛。扫描隧道显微镜测量结果显示CeO_2（100）以高度分散的三维（3D）岛的形式在CeO_2（100）界面层上生长。 CeO_2（100）岛表现出2×2的表面重构。表面重建以及CeO_2（100）岛的高度分散生长的存在对应于CeO_2（100）上表面偶极矩补偿的要求。 CeO_2（100）岛的特征还在于反射高能电子衍射，产生相对于Cu（111）衬底的外延关系。 Cu（111）支撑的特征明确的CeO_2（100）岛的生长代表了开发新型模板的起点，该模板用于基于二氧化铈的模型催化剂的结构相关反应性研究。

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来源
《Applied Surface Science》 |2013年第ptab期|766-771|共6页
作者
O. Stetsovych; J. Beran; F. Dvorak; K. Masek; J. Myslivecek; V. Matolin;
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作者单位

Charles University, Faculty of Mathematics and Physics, V Holesovickach 2, Praha 8, Czech Republic;

Charles University, Faculty of Mathematics and Physics, V Holesovickach 2, Praha 8, Czech Republic;

Charles University, Faculty of Mathematics and Physics, V Holesovickach 2, Praha 8, Czech Republic;

Charles University, Faculty of Mathematics and Physics, V Holesovickach 2, Praha 8, Czech Republic;

Charles University, Faculty of Mathematics and Physics, V Holesovickach 2, Praha 8, Czech Republic;

Charles University, Faculty of Mathematics and Physics, V Holesovickach 2, Praha 8, Czech Republic;

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正文语种 eng
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关键词
CeO_2(100); Growth; Morphology; Reconstruction; Polar oxide surface; Surface dipole stabilization;

机译：CeO_2（100）;成长;形态学;重建;极性氧化物表面;表面偶极稳定;

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Polarity driven morphology of CeO_2(100) islands on Cu(111)

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