title: Pure Graphene Oxide Doped Conducting Polymer Nanocomposite for Bio-interfacing.
abstract: Advanced materials that are highly biocompatible and easily modifiable with biomolecules are of great importance for bio-interfacing and the development of biodevices. Here, a biocompatible conducting polymer based nanocomposite was electrochemically synthesized through the electropolymerization of poly(3, 4-ethylene dioxythiophene) (PEDOT) in the presence of graphene oxide (GO) as the only dopant. GO contains many negatively charged carboxyl functional groups and is highly dispersible in aqueous solutions, enabling its facile incorporation and even distribution throughout the conducting polymer. PEDOT/GO films exhibited minimal cytotoxicity after 24 h and supported neuron growth with significantly longer neurites than a control PEDOT/PSS film, indicating that the PEDOT/GO film provides a positive growth signal to developing neurons. While some of the negatively charged functional carboxyl groups of GO "dope" the PEDOT, others are exposed freely on the surface of the nanocomposite allowing easy functionalization of the PEDOT/GO composite with biomolecules. Functional laminin peptide, RNIAEIIKDI (p20), was covalently bound to the surface of the PEDOT/GO film and maintained its bioactivity, as evidenced by an increased neurite outgrowth from neurons cultured on the functionalized composite surface. The ease of biomolecule functionalization of the PEDOT/GO nanocomposite, along with its low electrochemical impedance, minimal toxicity and permissiveness to neuron growth, underlines its potential as a material for widespread biosensing, neural interfacing and tissue engineering applications.
authors.affiliation: Key Laboratory of Biochemical Analysis, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
authors.forename: Xiliang
authors.initials: X
authors.lastname: Luo
authors.affiliation: Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15260, USA ; Center for the Neural Basis of Cognition, University of Pittsburgh, Pittsburgh, PA 15260, USA.
authors.forename: Cassandra L
authors.initials: CL
authors.lastname: Weaver
authors.affiliation: Petersen Institute of Nanoscience and Engineering, University of Pittsburgh, Pittsburgh, PA 15260, USA.
authors.forename: Susheng
authors.initials: S
authors.lastname: Tan
authors.affiliation: Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15260, USA ; Center for the Neural Basis of Cognition, University of Pittsburgh, Pittsburgh, PA 15260, USA ; McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15260, USA.
authors.forename: Xinyan Tracy
authors.initials: XT
authors.lastname: Cui