Abstract
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•The CoO nanoparticles (CoONPs) were prepared via solution process.•Characterized via XRD, SEM, TEM, FTIR and CV spectroscopy.•The CoO was utilized for sensing against 4-Nitrophenol at very low conc.•Chronoamperometry, effect of time response, cycle response were studied.•Possible sensing mechanism also explained for the 4-Nitophenol with NPs.
-Nitrophenol (4-nitrophenol or 4-NP) is an industrial hazardous organic compound and leave an adverse effect on human beings. Due to their high toxicity rate it’s required to detect their efficiency at low cost and useful methods. To keep this view, the present study was designed and uses the cobalt oxide nanoparticles (CoONPs, ~9 nm) prepared via solution approach and characterized. The NPs were applied for the electrode preparation on to the glassy carbon electrode (GCE) via drop casted process. The modified CoONPs based GC electrode (CoONPs/GCE) was used to investigate their electrochemical sensing characteristics against 4-NP with parameters such as effect of concentration (1 to 31 μL of 4-NP/100 mL phosphate buffer solution (PBS)), effect of potential (1–100 mV/s) with fix concentration of 4-NP, effect of time response (0–1500 s), chronoamperometry etc. The reproducibility, sustainability were also tested through cycle response and a possible mechanism was also presented.