| 초록 |
Creation of macroscopic size of perfectly periodic nanostructure is one of the ultimate goals of nanoscience, and block copolymer nanostructure provides a good template for this. However, the nanostructure is easily infected by topological defects which sneak in due to entropic fluctuation and incomplete annealing. This problem can be removed by using chemically or physically patterned substrate which breaks the planar symmetry. A good example of this strategy is presented in a recent work by Sang Ouk Kim’s group [Adv. Mater. 2007, 19, 3271] where cylinder forming block copolymer thin films are deposited onto surfaces with selective oxidation. With the help of Self-Consistent Field Theory (SCFT), I theoretically compare various nanostructures competing on the chemically patterned substrates. It turns out that fine tuning of the pattern period and film thickness is crucial, for the purpose of creating well-aligned cross-cylinder morphology. |
