title: Ordered surfactant-templated poly(3,4-ethylenedioxythiophene) (PEDOT) conducting polymer on microfabricated neural probes.
abstract: Ordered conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) was electrochemically fabricated using a self-assembled medium of surfactant molecules as a template. The morphology and microstructure were extensively investigated by optical and electron microscopy, and results show that the coated films were composed of anisotropic domains having a characteristic size of 15-150 nm. The surfactant-templated ordered PEDOT films were electrochemically deposited on microfabricated neural probes with an electrode site area of 1,256 microm(2). The electrical properties were studied by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). EIS showed a lowered magnitude of 35 kOmega (from an initial approximately 800 kOmega) at the biologically relevant frequency of 1 kHz. CV results show that the film has higher charge capacity and is more electrochemically stable than either nodular PEDOT or PPy. Furthermore, we have begun to probe the biological response to such a material intended to define the tissue-material interface. Results show that minute concentrations of the non-ionic surfactant are enough to kill all nearby cells in culture. It is possible however, to create surfactant-templated ordered PEDOT such that SH-SY5Y survive on the conductive polymer.
authors.affiliation: Department of Materials Science and Engineering, 2022 H. H. Dow Building, The University of Michigan, Ann Arbor, MI 48109-2136, USA.
authors.forename: Junyan
authors.initials: J
authors.lastname: Yang
authors.forename: Dong Hwan
authors.initials: DH
authors.lastname: Kim
authors.forename: Jeffrey L
authors.initials: JL
authors.lastname: Hendricks
authors.forename: Michelle
authors.initials: M
authors.lastname: Leach
authors.forename: Rebecca
authors.initials: R
authors.lastname: Northey
authors.forename: David C
authors.initials: DC
authors.lastname: Martin
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000737:chemistry*; D002448:Cell Adhesion; D002460:Cell Line; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D004563:Electrochemistry; D006801:Humans; D008422:Materials Testing; D008839:Microelectrodes; D008854:Microscopy, Electron; D009474:Neurons / Q000166:cytology; D011108:Polymers / Q000737:chemistry*; D011474:Prosthesis Design; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry
chemical_list: D001672:Biocompatible Materials; D019086:Bridged Bicyclo Compounds, Heterocyclic; D020099:Coated Materials, Biocompatible; D011108:Polymers; D013501:Surface-Active Agents; C121383:poly(3,4-ethylene dioxythiophene)