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Publications in Scientific Journals:

A. Aghaie, A. Khanmohammadi, A. Hajian, U. Schmid, H. Bagheri:
"Nonenzymatic Electrochemical Determination of Paraoxon Ethyl in Water and Fruits by Graphene-Based NiFe Bimetallic Phosphosulfide Nanocomposite as a Superior Sensing Layer";
Food Analytical Methods, 12 (2019), 1545 - 1555.



English abstract:
A highly sensitive nonenzymatic electrochemical sensor is designed for stripping voltammetric determination of paraoxon ethyl
(PE) as a model for nitroaromatic organophosphates (OPs). Graphene-based NiFe bimetallic phosphosulfide nanocomposite is
used for the first time as a novel electrocatalytic modifier for enhancing the electrochemical signal of PE. As a consequence of the
efficient π-π stacking interactions between the aromatic structure of OPs and graphene and also due to the strong electrocatalytic
properties of the bimetallic phosphosulfide, PE can strongly bind to the surface of modified glassy carbon electrodes and provide
a dramatically enhanced voltammetric signal in a nonenzymatic determination method. Maximum square wave voltammetric
(SWV) signals were obtained when the adsorption step was completed via 5-min convection at 1000 rpm in an analyte solution
with the adjusted pH of 6. The SWV signal of PE was highly linear over the range of 12.3-10,000 nmol L−1 and with the
detection limit of 3.7 nmol L−1 (S/N = 3). The developed sensor shows good reproducibility (RSD = 5.2%, N = 10). The study
offers a promising application for bimetallic phosphosulfide compounds for developing fast, simple, and highly sensitive
nonenzymatic determination protocol for nitroaromatic OPs.


"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
http://dx.doi.org/10.1007/s12161-019-01486-8


Created from the Publication Database of the Vienna University of Technology.