Abstract
Fe3O4@C/Au nanoparticle (AuNP) nanocomposites were prepared through electrostatic adsorption of AuNPs onto PDDA-functionalized core/shell Fe3O4@C magnetic nanospheres, which had been synthesized by a facile solvothermal method. The morphology and composition of the nanocomposites were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), etc. Moreover, highly electrocatalytic activity to the reduction of hydrogen peroxide (H2O2) was also exhibited on the Fe3O4@C/AuNP-modified indium tin oxide (ITO) electrode. The effect of solution pH and the modification amount of Fe3O4@C/AuNPs on the performance of electrocatalytic H2O2 reduction was investigated. Under the optimal conditions, the catalytic current showed a linear relationship with the increase of H2O2 concentration in the range of 0.007–15 mM and a detection limit of 5 μM. The H2O2 sensor showed high selectivity for H2O2 detection, which could effectively resist the interference of ascorbic acid (AA), uric acid (UA), and citric acid (CA). Finally, the H2O2 sensor was used in the real fetal bovine serum to detect H2O2 and obtained satisfactory results with the recovery values ranging from 95.14 to 103.6%.
Highlights
Magnetic nanoparticles have been popularly applied in anode material [1], degradation [2], electromagnetic wave absorption [3], separation [4], and catalysis [5]
Qu and coworkers established a novel hydrogen peroxide (H2O2) sensor using Fe3O4 NPs/chitosan composite-modified electrode, which could electrocatalyze the reduction of H2O2 with a detection limit of 1.53 × 10–6 M [7]
Structure and Composition Characterization of Samples. e structure and morphology of the nanocomposites were investigated by transmission electron microscopy (TEM) and FESEM
Summary
Magnetic nanoparticles have been popularly applied in anode material [1], degradation [2], electromagnetic wave absorption [3], separation [4], and catalysis [5] Among these diverse magnetic nanomaterials reported before, Fe3O4 NPs have been studied extensively because of their excellent magnetism, biocompatibility, and especially, highly effective electrocatalytic activity. Fe3O4 NPs are unstable and prone to be aggregated and settled in aqueous solution because of the magnetic dipolar-dipolar attraction, resulting in the decrease of their catalytic activity [8]. To overcome this problem, considerable efforts have been devoted to introduce stabilizers on the surface of Fe3O4 NPs
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