Multiwalled Carbon Nanotubes Coated with Nitrogen–Sulfur Co-Doped Activated Carbon for Detecting Fenitrothion

A nonenzymatic electrochemical sensor is drop casted for sensitive and specific fenitrothion (FT) detection, where a glassy carbon electrode (GCE) modified by depositing an ink containing nitrogen–sulfur co-doped activated carbon-coated multiwalled nanotubes (NS-AC-MWCNTs). We provide method NS-AC-MWCNT synthesis as follows. First, polypyrrole coated on (PPy-MWCNT). Then, the PPy coating carbonized chemically to enhance surface area. The coating, with nitrogen–sulfur, improves its electrical conductivity electrocatalytic response electrode. Electrochemical impedance spectroscopy (EIS) confirms enhanced charge transfer NS-AC-MWCNT/GCE in comparison MWCNT/GCE GCE. Scanning electron microscopy (SEM) high-resolution transmission (HRTEM) fast Fourier transform (FFT) elucidate morphology of material, X-ray photoelectron (XPS) Raman chemical structural characteristics. An NS-AC-MWCNT-containing prepared deposited GCE fabricate detect FT. volume deposited, buffer solution pH, accumulation potential Vpp time tpp, square wave voltammetry (SWV) parameters are optimized. For 0.05–40 μM FT concentrations, provides linear current 4.91 nM limit detection (LOD) signal-to-noise (S/N) ratio 3. Chemical interferents have negligible influence detection. detects real lake tap water samples.