Morphology Tailoring of Thin Film Block Copolymers on Patterned Substrates

Abstract

It is well known that chemically patterned substrates can direct the assembly of adsorbed layers or thin films of block copolymers. For a cylinder-forming diblock copolymer on periodically spot-patterned substrates, the morphology of the block copolymer follows the pattern at the substrate; however, with different periodic spacing and spot size of the pattern, novel morphologies can be created. Specifically, we have demonstrated that new morphologies that are absent in the bulk system can be tailored by judiciously varying the mismatch between the width of the pattern and the periodic spacing of the bulk block copolymer, the top surface affinity, and spot size. New morphologies can thus be achieved, such as honeycomb and ring structures, which do not appear in the bulk system. These results demonstrate a promising strategy for fabrication of new nanostructures from chemically patterned substrates.

The Influences of Cooperative Swelling and Coordination on Patterned Decoration of Gold on Block Copolymer Nanospheres

“…To identify Au on selective areas of PS-b -P2VP nanospheres, EDX analysis was conducted with the JEOL 2100 microscope. [15][16][17]44 ] Such a phase transformation is shown by the appearance of a nanosized hole factor for the surface pattern on BCP nanospheres. It is known that the p K a value of pyridine is about 5.2.…”

“…Metal nanoring arrays on glass or silicon substrates have been generated by colloidal lithography [ 11 ] and glancing angle metal evaporation on block copolymer thin fi lms. [ 15 ] A reverse micelle thin fi lm of PS-b -P2VP spincoated on a silicon substrate possesses a regular ring pattern and this can be transformed to gold nanorings by forming a complex with HAuCl 4 . [ 15 ] A reverse micelle thin fi lm of PS-b -P2VP spincoated on a silicon substrate possesses a regular ring pattern and this can be transformed to gold nanorings by forming a complex with HAuCl 4 .…”

Morphology of diblock copolymers in porous media

“…Such geometries could result from nano-rod arrays of different shapes (e.g. cylindrical [76][77][78][79][80], rectangular [81], etc.). The aforementioned cases were examined with the SCFT approach [76][77][78]80,81] or using an annealing MC simulation approach [79].…”

Enhancement of the Photoalignment Stability of Block Copolymer Brushes by Anchor Segments

“…[8][9][10] Annealing of block copolymers allows for the formation of a number of stable morphologies, including spheres, cylinders, gyroids, and lamellae. [11,12] For block copolymers, various functional groups can be easily introduced into the terminus of polymer chains, [13][14][15][16] which provides favorable conditions for controlled microphase separation. Seki et al proposed that highly flexible chains with low over sodium and then distilled.…”