Core-Shell Structured Polyaniline (PANI) – Manganese Dioxide (MnO2) Nanocomposites as an Electrochemical Sensor for Detection of Emamectin Benzoate
Abstract
A novel electrochemical sensing application was investigated for the detection of Emamectin Benzoate (EmBz). Herein, MnO2 nanoparticles and nanocomposites of polyaniline (PANI) – manganese dioxide (MnO2) were prepared by co-precipitation process and one step in-situ chemical oxidative polymerization process, respectively. And the electrode of composites was fabricated through carbon paste electrode method. The synthesized materials were fully characterized by using different physicochemical characterization techniques including ultraviolet-visible spectroscopy (UV-Vis), fourier transform infrared spectroscopy (FTIR), X-ray diffraction technique (XRD), field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HR-TEM) and thermogravimetric analysis (TGA). The sensing properties were examined by differential pulse voltammetry (DPV). The sensor was applied for the detection of insecticide emamectin benzoate for the first time. The nanocomposites exhibited high sensitivity with lower limit of detection (LOD) 6.2 x 10-4. The results demonstrated the promising nature of cost effective and environmentally benign nanocomposites of PANI and MnO2 as sensing electrode material to determine emamectin benzoate in water and soil samples.