Development of nanostructured composIte electrodes and theIr analytIcal applIcatIons

Project no. 21471 · Status: Kapanmış · 2020

Summary

In this project, different electrode surfaces with high catalytic efficiency and selectivity against analytes were developed. In these electrodes, which were developed due to the inadequacy of traditional electrodes in applications, carbon nanotubes, which have properties such as effective surface area and high conductivity, were combined with conductive polymer film and metal/metal oxide nanoparticles and used as a new electrode material. Additionally, graphene oxide and different hybrid materials were synthesized and mixed in certain proportions and used as electrode materials. In the first study of this three-part project, selective and sensitive determination of rutin was carried out by preparing conditioned multi-walled carbon nanotube (MWCNT) and polymer (polyphenosafranine) coated electrodes modified with metal oxide nanoparticles. The electrochemical behavior of Rutin in the modified electrode was examined in pH 3.0 BR buffer, and real sample analysis was performed on the Rutin tablet sample. The oxidation peak current for the rutin Co3O4/MWCNT/PPSF/GCE shows two different inclined linear changes in the ranges of 8.0x10-9 M – 6.0x10-7 M and 8.0x10-7 M – 6.0x0x10-6 M, and the detection limit was found 3.79x10-9mol L-1(S/N=3).In the second study, graphene oxide (GO) was synthesized using the Brodie method, and manganese dioxide-hexagonal molybdenum (VI) oxide (MnO2-hMoO3) hybrid material was synthesized by the chemical precipitation method. The synthesized MnO2-hMoO3 hybrid structure was suspended in DMF with GO at the ratio of 5% and 95% and dropped onto the GCE surface, and selective and sensitive determination of acetaminophen (ACP) was carried out. The oxidation peak current for ACP (5%)(MnO2-h-MoO3)+(95%)GO/GCE have shown a linear change with two different slopes in the ranges of 0.06 µmol L−1 to 10.0 µmol L−1 and 20.0 µmol L−1 to 80.0 µmol L−1. and the LOD was 3.83x10-8  M (S/N=3).In the third study, nickel molybdate (NiMoO4) hybrid material was synthesized using the hydrothermal method. In the other study, it was suspended with GO synthesized and dropped onto the electrode surface ((5%)(NiMoO4)+(95%)GO/GCE) and simultaneous sensitivity determination of acetaminophen (ACP) and tryptophan (TRP) was performed. A linear changing of peak currents of individual ACP or TRP concentrations were found and the calibration curves were constituted for ACP with two different linear parts at NiMoO4(5%)+GO(95%)/GCE: the first linear part was obtained as from 0.1x10-6 to 1.0x10-6 M and the second linear part from 2.0x10-5 to 1.0x10-5 M and the calibartion curve was constructed in the concentration range of TRP from 0.6x10-6 – 6.0x10-5 M. The detection limits were found to be 10.0 nM ACP and 0.798 nM TRP respectively. Electrode surface characterization of the prepared metal oxide nanoparticle modified polymer film and carbon nanotube and GO+hybrid material were carried out using scanning electron microscopy, X-ray photoelectron spectroscopy, energy dispersion X-ray spectroscopy, electrochemical impedance and X-ray diffraction techniques.

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