title: Electrospun carbon nanofiber modified electrodes for stripping voltammetry.
abstract: Electrospun polyacrylonitrile (PAN) based carbon nanofibers (CNFs) have attracted intense attention due to their easy processing, high carbon yield, and robust mechanical properties. In this work, a CNF modified glassy carbon (GC) electrode that was coated with Nafion polymer was evaluated as a new electrode material for the simultaneous determination of trace levels of heavy metal ions by anodic stripping voltammetry (ASV). Pb(2+) and Cd(2+) were used as a representative system for this initial study. Well-defined stripping voltammograms were obtained when Pb(2+) and Cd(2+) were determined individually and then simultaneously in a mixture. Compared to a bare GC electrode, the CNF/Nafion modified GC (CNF/Nafion/GC) electrode improved the sensitivity for lead detection by 8-fold. The interface properties of the CNF/Nafion/GC were characterized by electrochemical impedance spectroscopy (EIS), which showed the importance of the ratio of CNF/Nafion on electrode performance. Under optimized conditions, the detection limits are 0.9 and 1.5 nM for Pb(2+) and Cd(2+), respectively.
authors.affiliation: Department of Chemistry, University of Cincinnati , Cincinnati, Ohio 45221-0172, United States.
authors.forename: Daoli
authors.initials: D
authors.lastname: Zhao
authors.affiliation: Department of Chemistry, University of Cincinnati , Cincinnati, Ohio 45221-0172, United States.
authors.forename: Tingting
authors.initials: T
authors.lastname: Wang
authors.affiliation: Nanoelectronics Laboratory, Department of Electrical Engineering and Computing Systems, University of Cincinnati , Cincinnati, Ohio 45221-0030, United States.
authors.forename: Daewoo
authors.initials: D
authors.lastname: Han
authors.affiliation: Department of Chemistry, University of Cincinnati , Cincinnati, Ohio 45221-0172, United States.
authors.forename: Cory
authors.initials: C
authors.lastname: Rusinek
authors.affiliation: Nanoelectronics Laboratory, Department of Electrical Engineering and Computing Systems, University of Cincinnati , Cincinnati, Ohio 45221-0030, United States.
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Steckl
authors.affiliation: Department of Chemistry, University of Cincinnati , Cincinnati, Ohio 45221-0172, United States.
authors.forename: William R
authors.initials: WR
authors.lastname: Heineman