Publication details

Authors: Zhao, D. L.; Wang, T. T.; Han, D.; Rusinek, C.; Steckl, A. J.; Heineman, W. R. 
Title: Electrospun Carbon Nanofiber Modified Electrodes for Stripping Voltammetry 
Type: Journal Article 
Publisher: Analytical Chemistry 
Year: 2015 
Volume: 87 
Issue: 18 
Start Page: 9315 
End Page: 9321 
DOI: 10.1021/acs.analchem.5b02017 
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). Pb2+ and Cd2+ were used as a representative system for this initial study. Well-defined stripping voltammograms were obtained when Pb2+ and Cd2+ 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 Pb2+ and Cd2+, respectively. 
Keywords: bismuth-film electrodes, electrochemical properties, composite electrodes, nanotube electrodes, heavy-metals, trace-metals, nafion film, polyacrylonitrile, cadmium, lead