Detection of hydrogen peroxide with low-dimensional silver nanoparticle-decorated PPy-C/TiO2 nanocomposites by electrochemical approach

Abstract

Herein, a sensor probe based on differential pulse voltammetric (DPV) electrochemical approach was developed for an efficient detection of hydrogen peroxide (H2O2) in a room conditions. In this approach, flat-polished glassy carbon electrode (GCE) was coated with silver (Ag)-decorated polypyrrole-carbon black/TiO2 ([email protected]/TiO2) nanocomposites (NCs) with the help of PEDOT:PSS, which functioned as conducting coating binder for active sensing substrate. The prepared [email protected]/TiO2 NCs were totally characterized using various analyzing tools such as High-Resolution Transmission Electron Microscopy (HR-TEM), Field Emission Scanning Electron Microscopy (FE-SEM), Energy Dispersive Spectroscopy (EDS), X-ray photo-electron spectroscopy (XPS), Fourier-Transform Infrared Spectroscopy (FTIR), Brunauer-Emmett-Teller (BET), and powder X-ray Diffraction (XRD). The fabricated working electrode (WE) as [email protected]/TiO2 NCs/GCE was found to respond linearly in a wide concentration range of H2O2 of 0.5∼57.0 µM, which defined as a dynamic detection range (LDR). The sensor's reliability measuring parameter’s including sensitivity (10.4146 µAµM-1cm-2), detection limit (LOD; 0.23±0.012 µM), and limit of quantification (LOQ; 0.697 µM) were also calculated in this development. In addition, the other sensors' parameters (like, reproducibility) were measured during the electrochemical detection of H2O2. Real samples were collected from the various sources, which tested to execute the validation of this H2O2 sensor. It is exhibited the sensitive and reproducible responses by electrochemical approach towards H2O2 at room conditions. Therefore, the developed [email protected]/TiO2 NCs/GCE sensor probe by DPV technique based on the current-developed sensing substrate might be facile and reliable to enrich the sensor technology and for the sensitive detection of unsafe chemicals for the safety of healthcare and environmental fields in a broad scale.