Abstract: Systems and methods for producing a covalent organic framework including providing a first monomer to a first zone in a furnace, a second monomer to a second zone in the furnace, and a substrate to a third zone in the furnace, where the third zone is located downstream from the first zone and the second zone. Systems and methods also include heating the furnace to a achieve temperature profile having a range of temperatures where the range of temperatures vaporizes the first monomer the second monomer. Systems and methods further include absorbing, onto the substrate, the first vaporized monomer and the second vaporized monomer to produce a covalent organic framework (COF). Articles produced by systems and methods include a film of a covalent organic framework (COF). The COF is a reaction product of a first monomer and a second monomer, and the COF is arranged in a two-dimensional crystalline lattice.