Abstract
In the present work, the ZnO and Al-ZnO nanoflakes (NFs) were synthesized by the co-precipitation process. The synthesized NFs were characterized by X-ray diffraction and field emission scanning electron microscopy. Energy dispersive X-ray spectrometer was explored for the elemental chemical compositions. The prepared NFs were taken for the modification of the electrode and developed the modified electrode for the electrochemical analysis of the dopamine (DOA) at pH 7.4. The Al-ZnO modified carbon paste electrode (MCPE) was electropolymerised by using textile dye red DSBR. The Po-RD/Al-ZnO MCPE exhibited good electrochemical sensor properties towards the electrochemical detection of DOA. Several factors such as the impact of speed rate (υ), pH and concentration of the DOA were analyzed at the modified electrode. The great sensitivity was established to the fast electron-transfer kinetics and surface coverage of the DOA on the electrode. The prepared electrode exhibits satisfactory stability at the ambient conditions. The detection limit of 0.58 μM was achieved for the DOA. The decorated sensor was stable, sensitive, selective, and reproducible and used in the analytical applications.
Highlights
In the present work, the Zinc oxide (ZnO) and Al-ZnO nanoflakes (NFs) were synthesized by the co-precipitation process
The impact of the potential speed rate (υ) on the electrochemical performance of the DOA was studied in phosphate buffer solution (PBS) at Po-RD/Al-ZnO modified carbon paste electrode (MCPE)
Likewise second to fifth day current signals almost recollected. This result shows the reproducibility of Po-RD/Al-ZnO MCPE
Summary
Indicated the decrease in the crystallinity of ZnO NFs because of the corroboration of defects in the lattice s ite[30]. The obtained results showed that modified electrode exhibits marvelous performance and it decreased the ΔE with enhancement in anodic peak current (Ipa). These results indicate the catalytic effect of the developed sensor on DOA analysis. The impact of the potential speed rate (υ) on the electrochemical performance of the DOA was studied in PBS (pH 7.4) at Po-RD/Al-ZnO MCPE. Electrodes Au/Gr-Au Pt–Au hybrid CTAB/CPE Fc-MCPE poly (sudan III)/MCPE SWCNT/GCE Metallothioneins self-assembled gold electrode LDH/CILE Ag-reduced GO/GCE Poly-VA/MWCNT/GCE Ag/Ag2S-CNT-Nafion BPVCM-e/MWCNT/GCE Poly(amido black) MCPE CTAB-GO/MWNT Au/RGO ERGO Po-RD/Al-ZnO MCPE
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