Methyl parathion detection in vegetables and fruits using silver@graphene nanoribbons nanocomposite modified screen printed electrode

Abstract

We have developed a sensitive electrochemical sensor for Organophosphorus pesticide methyl parathion (MP) using silver particles supported graphene nanoribbons (Ag@GNRs). The Ag@GNRs nanocomposite was prepared through facile wet chemical strategy and characterized by TEM, EDX, XRD, Raman, UV-visible, electrochemical and impedance spectroscopies. The Ag@GNRs film modified screen printed carbon electrode (SPCE) delivers excellent electrocatalytic ability to the reduction of MP. The Ag@GNRs/SPCE detects sub-nanomolar concentrations of MP with excellent selectivity. The synergic effects between special electrocatalytic ability of Ag and excellent physicochemical properties of GNRs (large surface area, high conductivity, high area-normalized edge-plane structures and abundant catalytic sites) make the composite highly suitable for MP sensing. Most importantly, the method is successfully demonstrated in vegetables and fruits which revealed its potential real-time applicability in food analysis.

Highly Luminescent Ternary Nanocomposite of Polyaniline, Silver Nanoparticles and Graphene Oxide Quantum Dots

“…Figure 7(a) depicts the Raman spectrum of GO QDs and the major Raman features of GO QDs are the D band at around 1324 cm − 1 , the high G band at 1589 cm − 1 and the small broad 2D band at around 2236 cm −1 . The D band represents the defect in graphitic structure 55–57 and the G band represents the symmetric vibration of carbon atoms in graphite structure 57 . The intensity ratio of D band and G band ( I D / I G ) represents the defect density in carbon structure 58 .…”

Deposition of nanomaterials: A crucial step in biosensor fabrication

“…Screen-printed electrodes are more commonly screen-printed using different nanomaterial-based inks [319][320][321][322][323][324][325][326] Fig. 14) [329].…”

VXC-72R/ZrO2/GCE-Based Electrochemical Sensor for the High-Sensitivity Detection of Methyl Parathion

“…As a classic pesticide, methyl parathion (MP) has made important contributions to the field of crop protection and pest control [1]. However, the problem of MP residues has a serious impact on human health and the environment [2,3,4]. Therefore, research and development for a convenient and efficient detecting method for MP at trace levels have attracted more and more research interests from scientific researchers.…”

“…It should also be noted that the preparation of high-performance electrochemical sensors is largely dependent on chemically modified electrodes. Among the many modification materials, carbon materials (graphene [4,14,15,16,17], carbon nanotubes [18,19,20], mesoporous carbon [21,22], etc.) play a significant role in improving electrochemical sensor performance.…”