Evolution of step morphology on vicinal sapphire (1-102) surfaces accompanied with self-assembly of comb-shaped chemical domains
Evolution of step morphology on vicinal sapphire (1-102) surfaces accompanied with self-assembly of comb-shaped chemical domains
复制标题
邻位蓝宝石（1-102）表面阶梯形貌的演化伴随着梳状化学域的自组装
DOI：
10.1016/j.apsusc.2012.02.052
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
T.Ogino
中科院分区：
文献类型：
--
作者：
H.Komurasaki;T.Isono;T.Tsukamoto;T.Ogino
通过原子力显微镜（AFM）观察了在1073K和1273K之间退火后的空气中蓝宝石（1−102）表面的形貌。其中一类样品在退火初期在台阶边缘附近表现出高密度的单原子高度的岛和空洞，晶体各向异性表现为细长的形状。在随后的退火过程中，它们的密度通过奥斯特瓦尔德成熟过程降低，最终合并到上下阶地中。在另一种类型的样品表面，在1273K下退火3h后，出现了由沿[1−10−1]方向的平行条纹域组成的梳状图案。使用摩擦力显微镜观察条纹域和其他区域之间的亲水性差异，通过半月板力检测表面吸附水的量。条纹图案是表面各向异性的特征之一，因为当两个条纹应力域交替排列时，表面能会降低。
Morphology of vicinal sapphire (1−102) surfaces was observed in air by atomic force microscopy (AFM) after annealing at temperatures between 1073K and 1273K. Surfaces of one type of the samples exhibited high densities of islands and voids with single-atomic height near the step edges at the early stage of annealing, and the crystallographic anisotropy appears as their elongated shapes. During the subsequent annealing, their densities were decreased through the Ostwald ripening process, and finally they were incorporated into the upper and lower terraces. On surfaces of another type of the samples, a comb-shaped pattern consisting of parallel-striped domains running along the [1−10−1] direction appeared upon the annealing at 1273K for 3h. Difference in hydrophilicity was observed between the striped domains and the other areas using frictional force microscopy, which detects the amount of adsorbed water on the surface through meniscus force. The striped pattern that is one of the features of the surface anisotropy is considered to be formed because the surface energy can be decreased when two striped stress domains are alternately arranged.