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Publications in Scientific Journals:

N. Karimian, H. Fakhri, Amidi, A. Hajian, F. Arduini, H. Bagheri:
"A novel sensing layer based on metal-organic framework UiO-66 modified with TiO2-graphene oxide: application to rapid, sensitive and simultaneous determination of paraoxon and chlorpyrifos";
New Journal of Chemistry, 43 (2019), 2600 - 2609.



English abstract:
In this paper, a novel enzymeless electrochemical sensor with high sensitivity was constructed based on
TiO2 functionalized graphene oxide@UiO-66 (TGO@UiO-66) for simultaneous detection of paraoxon
and chlorpyrifos. TGO@UiO-66 for electrode modification possesses good conductivity and a distinctive
structure, which promotes the electron transfer rate and improves the efficiency of electrochemical
sensors. In this work, a TGO@UiO-66 modified glassy carbon electrode (TGO@UiO-66/GCE) was used
for simultaneous determination of paraoxon and chlorpyrifos. The square wave voltammogram of
TGO@UiO-66/GCE in the presence of paraoxon and chlorpyrifos showed two characteristic cathodic
peaks at 0.45 and 1.3 V (vs. Ag/AgCl). Also, excellent electrochemical characteristics of the proposed
sensor were evidenced by impedance and cyclic voltammetry studies in a Fe(CN)6
4 /3 solution.
Different experimental parameters such as the type of electrolyte, pH of the electrolyte, and scan rate
were optimized, and calibration curves were plotted under the optimal conditions. The designed sensor
exhibited low detection limits of 0.2 and 1.0 nM within the linear ranges of 1.0-100.0 nM and 5.0-300.0 nM
for paraoxon and chlorpyrifos, respectively. The developed sensor was successfully applied to pesticide
residue monitoring in vegetable and water samples.


"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
http://dx.doi.org/10.1039/c8nj06208k


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