Micro/Nanowell Arrays Fabricated from Covalently Immobilized Polymer Thin Films on a Flat Substrate

This Letter describes a new method to create micro/nanowell arrays from covalently attached polymer thin films on a silicon wafer. The immobilization chemistry utilized a photoactive cross-linker, resulting in polymer thin films of several to a few tens of nanometers. Micro/nanowell arrays were obtained when two polymers were immobilized sequentially and the second was thicker than the first polymer. The well arrays were generated from either different polymers, or the same polymer with different molecular weights.