title: POROUS MATERIALS. Transient laser heating induced hierarchical porous structures from block copolymer-directed self-assembly.
abstract: Development of rapid processes combining hierarchical self-assembly with mesoscopic shape control has remained a challenge. This is particularly true for high-surface-area porous materials essential for applications including separation and detection, catalysis, and energy conversion and storage. We introduce a simple and rapid laser writing method compatible with semiconductor processing technology to control three-dimensionally continuous hierarchically porous polymer network structures and shapes. Combining self-assembly of mixtures of block copolymers and resols with spatially localized transient laser heating enables pore size and pore size distribution control in all-organic and highly conducting inorganic carbon films with variable thickness. The method provides all-laser-controlled pathways to complex high-surface-area structures, including fabrication of microfluidic devices with high-surface-area channels and complex porous crystalline semiconductor nanostructures.
authors.affiliation: Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA.
authors.forename: Kwan Wee
authors.initials: KW
authors.lastname: Tan
authors.affiliation: Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA.
authors.forename: Byungki
authors.initials: B
authors.lastname: Jung
authors.affiliation: Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA. Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA.
authors.forename: Jörg G
authors.initials: JG
authors.lastname: Werner
authors.affiliation: Cornell NanoScale Science and Technology Facility, Cornell University, Ithaca, NY 14853, USA.
authors.forename: Elizabeth R
authors.initials: ER
authors.lastname: Rhoades
authors.affiliation: Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA.
authors.forename: Michael O
authors.initials: MO
authors.lastname: Thompson
authors.affiliation: Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA. ubw1@cornell.edu.
authors.forename: Ulrich
authors.initials: U
authors.lastname: Wiesner