title: Fabrication of polymer microstructures for MEMS: sacrificial layer micromolding and patterned substrate micromolding.
abstract: Two soft lithography based fabrication techniques are employed for fabricating mechanically independent, freely suspended polymer microstructure from poly(n-propyl methacrylate) (PPMA), poly(methyl methacrylate) (PMMA), and polystyrene. Both methods involve a micromolding process followed by thermal bonding to the substrate. The first method, sacrificial layer micromolding, uses a water soluble sacrificial layer, allowing functional structures to be released by immersion in water. The second method, patterned substrate micromolding, uses a permanent substrate patterned via photolithography. Functional regions of the polymer MEMS are suspended over the voids in the photoresist pattern. The processes have been applied to the fabrication of polymer microstructures with a variety of geometries for specific applications. Devices have included microcantilevers, beams, and other more complicated microstructures. The thermal molding process is conceivably applicable to the fabrication of microstructures from a wide variety of thermoplastic polymers, allowing material selection to be tailored based on application.
authors.affiliation: Biomedical Engineering Center, Ohio State University, 1080 Carmack Rd., 270 Bevis Hall, Columbus, OH 43210, USA.
authors.forename: Nicholas
authors.initials: N
authors.lastname: Ferrell
authors.forename: James
authors.initials: J
authors.lastname: Woodard
authors.forename: Derek
authors.initials: D
authors.lastname: Hansford
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008422:Materials Testing; D044085:Microfluidics / Q000295:instrumentation / Q000379:methods*; D008904:Miniaturization; D011108:Polymers / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D001672:Biocompatible Materials; D011108:Polymers