Ultra-sensitive determination of fenitrothion pesticide in orange juice by gold-printed electrode modified with AgNPs/Carbon dots/MWCNTs Nanoarchitecture employing electrochemical impedance spectroscopy

Abstract This work describes the synthesis, characterization, and electrochemical application of innovative AgNPs/Carbon dots/MWCNTs nanoarchitecture. Silver nanoparticles (AgNPs) have been obtained by directly reducing silver nitrate salt in Carbon dots/MWCNTs alcoholic solution. UV-vis spectroscopy, HR-TEM, XPS, and electrochemical techniques have characterized this nanoarchitecture. The AgNPs/Carbon dots/MWCNTs nanoarchitecture has been dispersed on a gold printed electrode surface, showing excellent electrocatalytic activity for fenitrothion determination in acetate buffer, pH 4.5 by impedance electrochemistry spectroscopy with a detection limit of 0.48 nmol L− 1. The fenitrothion pesticide detection was also performed in orange juice and did not suffer significant interference from other pesticides.