Nonenzymatic H₂O₂ Electrochemical Sensor Based on SnO₂‐NPs Coated Polyethylenimine Functionalized Graphene

Abstract

This paper demonstrated using polyethylenimine (PEI)‐functionalized graphene (Gr) incorporating tin oxide (SnO2) hybrid nanocomposite as a platform for nonenzymatic H2O2 electrochemical sensor. The results of UV‐vis spectroscopy and X‐ray diffraction (XRD) confirmed the simultaneous formation of tin oxide (SnO2) nanocomposite and reduction of graphene oxide (GO). Transmission electron microscopy (TEM) images showed a uniform distribution of nanometer‐sized tin oxide nanoparticles on the grapheme sheets, which could be achieved using stannous chloride (SnCl2) complex instead of tin oxide as precursor. The electrochemical measurements, including cyclic voltammetry (CV) and amperometric performance (I‐t), showed that the PEI‐functionalized Gr supported SnO2 (SnO2‐PEI‐Gr) exhibited an excellent electrocatalytic activity toward the H2O2. The corresponding calibration curve of the current response showed a linear detection range of 9×10−6∼1.64×10−3 mol L−1, while the limit of detection was estimated to be 1×10−6 mol L−1. Electrochemical studies indicated that SnO2 and functionalized Gr worked synergistically for the detection of H2O2.

Graphene Oxide Membrane Immobilized Aptamer as a Highly Selective Hormone Removal

“…The spectrum of GO showed an intense peak for the aromatic bond (C–C) at 232 nm relating to the π–π* transition [ 33 ]. After the coupling between GO and PEI, the peak at 232 nm disappeared and another peak was generated at 268 nm, which confirmed the reduction of GO to rGO by the presence of PEI [ 34 ].…”

Facile Construction of Functionalized GO Nanocomposites with Enhanced Antibacterial Activity

“…The spectrum for GO nanosheets (curve a) displays a sharp peak at 230 nm that corresponds to the electronic π−π* transitions of aromatic C−C bonds [39]. The spectrum for PG nanosheets (curve b) shows that the peak at 230 nm vanished and another peak appeared at 260 nm, which was attributed to the reduction ability of PEI that led to the formation of PEI–reduced graphene oxide (rGO) nanocomposites [40]. In the spectrum for the TC/PG nanocomposites, a new peak appeared at 356 nm that corresponded to the characteristic peak of TC [41].…”

Two-Dimensional Hexagonal NiCo2O4 Nanoplates@PEDOT/RGO Nanocomposite: A Design and Construction High Selective H2O2 Sensing Interface

“…Graphene possess many excellent characteristics such as strong adsorption capacity, large specific surface area, high surface reactivity, and excellent biocompatibility. [41][42][43] Wang et al synthesized a graphene/nickel-cobalt nanocomposite via electrostatic self-assembly. 44 The obtained composite has good electrochemical performances and high sensitivity, which are due to good conductivity and large specific surface area of graphene sheets.…”