SnO2QDs Deposited on GO/PPy-Modified Glassy Carbon Electrode for Efficient Electrochemical Hydrogen Peroxide Sensor

Abstract

In this present work, we demonstrate an efficient electrochemical sensor for the detection of hydrogen peroxide (H2O2) using a glassy carbon electrode (GCE) modified with a ternary nanocomposite of tin oxide QDs/GO/PPy (SGP2). An in situ chemical oxidative polymerization method was used to create the SGP2 nanocomposite. FTIR, XRD, HR TEM, CV, DPV, and impedance analysis were used to characterize the nanocomposite. The SGP2 nanocomposite modified GCE can be used to create an effective H2O2 electrochemical sensor with high sensitivity and a low detection limit (LOD). With SGP2 modified GCE, the electrochemical detection test for H2O2 was carried out using cyclic voltammetry (CV) and amperometric methods. The SGP2 modified GCE shows improved sensing capabilities, resulting in considerable sensitivity of 11.69 µA mM cm−2 and a very low limit of detection (LOD) of 0.758 µM for a broad linear range of H2O2 concentration from 0.1 mM to 0.8 mM with a correlation coefficient R2 = 0.9886. Additionally, the performance of the SGP2-modified GCE electrode is on par with or nonetheless superior to that of the other functional materials that have been reported for H2O2. As a result, our findings suggest that combining conductive polymer with metal oxide may be a useful method for producing sophisticated and affordable electrochemical sensors.

Metal Oxides Nanomaterials and Nanocomposite-Based Electrochemical Sensors for Healthcare Applications

“…Owing to a wide operating potential window, strong surface chemistry, lower price, and chemical inertness, various carbon-derived nanocomposites of metal oxides with graphite, carbon paste (CP), carbon nanotubes (CNTs), graphene (GR), carbon fibers (CFs), activate porous carbon, and carbon nanodots are usually utilized as the sensing materials for the sensitive detection of a variety of biomarkers [14,27,[76][77][78][79]. Recently, Wahab et al re-ported a peroxidase mimicking electrochemical glucose sensor based on nanoarchitectured iron oxide embedded in mesoporous carbon nanozymes [80].…”

A Carbon‐Black‐Doped Molybdenite‐Based Electrochemical Sensor for Simultaneous Determination of Uric Acid, Dopamine, and Ascorbic Acid

“…In recent years, electrochemical sensors have attracted extensive attention according to their low cost, easy preparation, high sensitivity and fast reaction speed. [12][13][14][15] A variety of materials such as metal complexes, nanoparticles, carbon nanotubes, [16][17][18] graphene, [19,20] MoS 2 , [11] conductive polymers [21,22] metal oxide, [23] and biomass derived carbon [24] were applied to modify electrodes so as to improve the sensor's performance. Among them, molybdenum disulfide (MoS 2 ), which is a transition metal disulfide, has a graphene-like structure.…”