Efficient Detection of 2,6-Dinitrophenol with Silver Nanoparticle-Decorated Chitosan/SrSnO3 Nanocomposites by Differential Pulse Voltammetry

Herein, an ultra-sonication technique followed by a photoreduction technique was implemented to prepare silver nanoparticle-decorated Chitosan/SrSnO3 nanocomposites (Ag-decorated Chitosan/SrSnO3 NCs), and they were successively used as electron-sensing substrates coated on a glassy carbon electrode (GCE) for the development of a 2,6-dinitrophenol (2,6-DNP) efficient electrochemical sensor. The synthesized NCs were characterized in terms of morphology, surface composition, and optical properties using FESEM, TEM, HRTEM, BET, XRD, XPS, FTIR, and UV-vis analysis. Ag-decorated Chitosan/SrSnO3 NC/GCE fabricated with the conducting binder (PEDOT:PSS) was found to analyze 2,6-DNP in a wide detection range (LDR) of 1.5 similar to 13.5 mu M by applying the differential pulse voltammetry (DPV) approach. The 2,6-DNP sensor parameters, such as sensitivity (54.032 mu A mu M-1 cm(-2)), limit of detection (LOD; 0.18 +/- 0.01 mu M), limit of quantification (LOQ; 0.545 mu M) reproducibility, and response time, were found excellent and good results. Additionally, various environmental samples were analyzed and obtained reliable analytical results. Thus, it is the simplest way to develop a sensor probe with newly developed nanocomposite materials for analyzing the carcinogenic contaminants from the environmental effluents by electrochemical approach for the safety of environmental and healthcare fields in a broad scale.

Automated summary

An ultra-sonication technique followed by a photoreduction technique was used to prepare silver nanoparticle-decorated Chitosan/SrSnO3 nanocomposites. These nanocomposites were then used as electron-sensing substrates for the development of an efficient electrochemical sensor for 2,6-dinitrophenol. The sensor exhibited excellent sensitivity, a wide detection range, and reliable results when applied to various environmental samples. This research provides a simple and effective method for analyzing carcinogenic contaminants in environmental effluents.