The efficacy of the ZnO:α-Fe2O3 composites modified carbon paste electrode for the sensitive electrochemical detection of loperamide: A detailed investigation

Nanosized (Ni1−xZnx)Fe2O4for water oxidation

“…It was proposed that the binding of Zn( ii ) to Fe( iii )–O results in the shifting of the binding energy. 41 The area attributed to O 1s showed different peaks attributed to OH 2 , OH and O on the surface of 1 ( Fig. 8e ).…”

MWCNT/Nileblue Heterostructured Composite Electrode for Flavanone Naringenin Quantification in Fruit Juices

“…In the concentration range from 50.0 μM to 0.9 μM, NR oxidation occurred at a constant potential of 465 mV as displayed in Figure (a). Such shift in potential during quantification has been contemplated in literature . The reduced over‐potential for NR at low concentrations with DPV reflects the advantage of pulse technique as more sensitive, for the reason that capacitive currents are negligible compared to Faradic currents .…”

Development of a Novel Electrochemical Sensor Based on Gold Nanoparticle-Modified Carbon-Paste Electrode for the Detection of Congo Red Dye

“…The cationic CR is weakly attached to the negative surface of the AuNPs and competes with H + for available sites at acidic pH, a repulsion process accrues between the cationic CR and the surrounding H + ions [31]. However, the increase in pH to 6.5 leads to a decrease in the H + ions and an increase in the unprotonated form of CR molecules around the electrode, which enhances the oxidation of the current signal [32]. The depletion of the oxidation current signal in the high basic medium may be ascribed to the repulsion between the negatively charged AuNPs and both OH − ions and the anionic form of CR [33].…”