Nanostructures on the SrTiO3(001) surface studied by STM
Nanostructures on the SrTiO3(001) surface studied by STM
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DOI：
10.1016/s0039-6028(02)02053-8
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发表时间：
2002-09-10
期刊：
影响因子：
1.9
通讯作者：
Castell, MR
中科院分区：
文献类型：
--
作者：
Castell, MR
原子分辨率扫描隧道显微镜的SrTiO 3（0 0 1）表面显示，某些治疗引起两种类型的自组装纳米结构。通过Ar离子溅射和超高真空（UHV）退火至900 ℃制备的表面形成具有c（4 x 2）重建的直阶边缘的平台。在900摄氏度以上进一步UHV退火后，产生了宽度为1 nm、高度为0.2 nm、长度可变的纳米线，这些纳米线在方向上延伸。在最紧密堆积时，纳米线相距2.4 nm，并形成（6 X 2）覆盖层。在进一步退火时，纳米线分裂成形成规则阵列的0.2nm高的纳米点。有人提出，这两种结构类型的创建通过非化学计量的表面区域，导致在纳米晶体生长的SrO或TiOx。以这种方式图案化的SrTiO（3）表面具有用作金属或半导体量子结构生长的模板的潜力。(C)2002 Elsevier Science B.V.保留所有权利。
Atomic resolution scanning tunnelling microscopy of the SrTiO3(0 0 1) surface reveals that certain treatments give rise to two types of self-assembled nanostructures. Surfaces prepared through Ar ion sputtering and ultrahigh vacuum (UHV) annealing up to 900 degreesC form terraces with straight step edges that have a c(4 x 2) reconstruction. Following further UHV annealing above 900 degreesC nanolines of 1 nm width, 0.2 nm height, and variable length are created that run in directions. On closest packing the nanolines are 2.4 nm apart and form a (6 x 2) overlayer. On further annealing the nanolines break up into nanodots of 0.2 nm height that form regular arrays. It is proposed that both structure types are created through non-stoichiometry of the surface region that results in nanocrystalline growth of either SrO or TiOx. SrTio(3) surfaces patterned in this way have the potential to serve as a template for the growth of metallic or semiconducting quantum structures. (C) 2002 Elsevier Science B.V. All rights reserved.