Dual Defect Discretely Engineered Mn-LFO@N-rGO Nanohybrids for Ultra-sensitive Electrochemical Detection of Ethyl Parathion

Abstract

The Optimized hybrid electrocatalysts enable efficient detection of diverse organophosphorus pesticides, supporting point of care applications and next generation sensors. Herein, a potential environmental pesticide ethyl parathion (EP) sensor utilizing manganese defect-rich lanthanum ortho ferrite integrated nitrogen atom doped rGO nanosheets (Mn-LFO@N-rGO) composite via the hydrothermal method. The Incorporation of Mn-LFO with rGO provides better structural stability and electro active surface area. The development of defect-engineered Mn-LFO@N-rGO was validated by structural and morphological investigations. Further, the adopted electrochemical investigations expose the Mn-LFO@N-rGO low limit of detection (3.1 µM) with high sensitivity (0.1613 µA µM-1 cm-2) and wide dynamic linear range (0.05-749.5 µM). Additionally, the proposed Mn-LFO@N-rGO modified GCE is highly selective, reproducible, and repeatable. These studies evidence the potential to detect the OP in environmental matrices. The practical implication was investigated with vegetable and edible oils specimens, and the obtained recovery ranges from 98-101% suggested the enormous potential holds for the Mn-LFO@N-rGO sensor for the detection of OP pesticides. Keywords: Mn doping; Lanthanum ortho ferrite; N-rGO; Organophosphorus; Electrochemical sensor