Nanometer-scale Surface Patterns with Long Range Order Created by Crystallisation of Diblock Copolymers
G. Reiter, G. Castelein, P. Hoerner, G. Riess, A. Blumen, J.-U. Sommer. Phys. Rev. Lett. 83, 3844-3847 (1999)
Abstract
We report experimental observations on the ordered surface patterns resulting from the crystallization of annealed thin films of microphase-separated low-molecular-weight hydrogenated poly(butadiene-b-ethyleneoxide) diblock copolymers. For crystal growth rates higher than about 1 nm/sec the resulting orientation of the crystalline lamellae was perpendicular to the substrate. Alignment of these lamellae on large length scales was found when crystallization occurred at boundaries crested by a dewetting process.