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首页> 外文期刊>Crystal growth & design >Ultrasmooth Ru(0001) Films as Templates for Ceria Nanoarchitectures
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Ultrasmooth Ru(0001) Films as Templates for Ceria Nanoarchitectures

机译：超光滑Ru（0001）薄膜作为Ceria纳米体系结构的模板

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摘要

Single crystalline magnetron sputter-deposited Ru(0001) epitaxial thin films on c-plane sapphire were prepared and used as a template for reactive CeO2 growth. Low-energy electron microscopy and diffraction, as well as transmission electron microscopy and atomic force microscopy, experiments were performed to investigate the crystallinity and morphology of the prepared films. Multiple cycles of Ar+ sputtering and high-temperature annealing produces films of exceptional surface quality. High-temperature reactive ceria growth leads to perfectly aligned triangular single-crystalline CeO2(111) islands of extraordinary morphological and structural homogeneity. At the chosen growth conditions, ceria nucleation takes place only at V-shaped surface defects on the otherwise atomically flat Ru terraces, opening up the possibility to influence the nucleation by introducing artificial surface defects using standard etching techniques. Due to their high crystallinity and extraordinary surface quality, these substrates present a low-cost alternative to Ru single crystals for model studies in heterogeneous catalysis and also allow for the use of destructive investigation techniques and irreversible surface modifications.
机译：制备了单晶磁控溅射沉积在c面蓝宝石上的Ru（0001）外延薄膜，并用作反应CeO2生长的模板。低能电子显微镜和衍射，以及透射电子显微镜和原子力显微镜，进行了实验以研究所制备的膜的结晶度和形态。 Ar +溅射和高温退火的多个循环可产生出众的表面质量的薄膜。高温反应性二氧化铈的生长导致形态和结构均一的三角形三角形单晶CeO2（111）岛完美对齐。在选定的生长条件下，二氧化铈成核仅发生在原本为原子的平坦Ru台阶上的V形表面缺陷处，从而通过使用标准蚀刻技术引入人造表面缺陷，打开了影响成核的可能性。由于它们的高结晶度和非凡的表面质量，这些基质为Ru多晶催化研究中的模型研究提供了Ru单晶的低成本替代品，还允许使用破坏性研究技术和不可逆的表面修饰。

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