MORPHOLOGY OF STEPS IN TERRACED BLOCK-COPOLYMER FILMS

被引:86
|
作者
CARVALHO, BL
THOMAS, EL
机构
[1] Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge
关键词
D O I
10.1103/PhysRevLett.73.3321
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Thin films of microphase separated symmetric diblock copolymers exhibit terraces. Atomic force microscopy is used to measure the free surface profile and transmission electron microscopy is used to elucidate the morphology within the film. Previous work has found the terraces to be composed of homeotropically aligned lamellae and has assumed the step between terraces to contain a dislocation. Our direct observations show that in ultrathin films steps contain homogeneously aligned lamellae. We suggest a minimal-surface model for the morphology of these steps. As the film thickness is increased, the lamellar alignment within steps displays a homogeneous-to-homeotropic transition. © 1994 The American Physical Society.
引用
收藏
页码:3321 / 3324
页数:4
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