Regular ordering of spherical microdomains in dewetted monolayer islands induced by thermal annealing of spin-coated ultrathin films of a triblock copolymer,Soft Matter

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Regular ordering of spherical microdomains in dewetted monolayer islands induced by thermal annealing of spin-coated ultrathin films of a triblock copolymer
Soft Matter ( IF 2.9 ) Pub Date : 2021-07-27 , DOI: 10.1039/d1sm00699a
Rasha Ahmed Hanafy Bayomi ₁ , Takashi Aoki ₂ , Sono Sasaki ₂ , Shinichi Sakurai ₃

Affiliation

We report here spontaneous dewetting of a spin-coated, ultra-thin film of a sphere-forming block copolymer (BCP) upon thermal annealing, and that the dewetting resulted in the formation of plateau-shaped islands with a constant thickness consistent with the thickness of a monolayer, in which the spherical microdomains are regularly ordered two-dimensionally in a deformed hexagonal lattice. Thus, the spontaneous dewetting was ascribed to a mismatch between the initial spin-coated film thickness with respect to the monolayer thickness. Such dewetting of sphere-forming BCPs is considered to be deterministic compared to the cases of lamella- and cylinder-forming BCPs, as incommensuration in thickness is avoided by attaining perpendicular orientation without dewetting. We further quantitatively examined the ordering regularity of spherical microdomains in the dewetted monolayer islands to clarify the effect of confinement on sphere ordering. The degree of deformation of the hexagonal lattice was found to have an increasing tendency as a function of the degree of the deformation of the dewetted islands (the island shape), irrespective of the size of the island. Namely, islands with almost round shapes exhibit a well-ordered arrangement of the spherical microdomains in a perfect hexagonal lattice. Another notable finding is that the regular ordering of the spherical microdomains was found to be spoiled in the vicinity of the edge of the island. In other words, the spherical microdomains were well-ordered in a hexagonal lattice far from the edge of the island, while they were not regularly ordered in the vicinity of the edge, which may be due to mismatch between the curvature of the island's perimeter and the polygonal shape of ordered sphere grains.

中文翻译：

三嵌段共聚物旋涂超薄膜热退火诱导去湿单层岛中球形微畴的规则排列

我们在此报告了在热退火时旋涂超薄膜的球形嵌段共聚物 (BCP) 的自发去湿，并且去湿导致形成具有与厚度一致的恒定厚度的高原形岛单层，其中球形微域在变形的六边形晶格中二维规则排列。因此，自发去湿归因于初始旋涂膜厚度与单层厚度之间的不匹配。与薄片状和圆柱状 BCP 的情况相比，球状 BCP 的这种去湿被认为是确定性的，因为通过在不去湿的情况下获得垂直取向可以避免厚度不对称。我们进一步定量检查了去湿单层岛中球形微域的排序规律，以阐明限制对球排序的影响。发现六方晶格的变形程度作为去湿岛（岛形状）的变形程度的函数而具有增加的趋势，而与岛的大小无关。即，几乎圆形的岛在完美的六边形晶格中表现出球形微域的有序排列。另一个值得注意的发现是，在岛的边缘附近发现球形微域的规则排列被破坏了。换句话说，球形微域在远离岛边缘的六边形晶格中有序排列，

更新日期：2021-07-27

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