Novel Approach for the Decoration of Magnetic Carbon Nanospheres with Platinum Nanoparticles and Their Enhanced Peroxidase Activity for the Colorimetric Detection of H2O2

Pt/Fe3O4-DIB-DETA-CNS(PFDDC) nanocomposite(DIB=2,4-dihydroxybenzaldehyde; DETA=diethylene-triamine; CNS=carbon nanosphere) was synthesized by dispersing Pt nanoparticles on magnetic carbon nanospheres. The structure, morphology and composition of the nanocomposite were studied by X-ray diffraction(XRD), transmission electron microscopy(TEM), energy-dispersive X-ray spectroscopy(EDX) and X-ray photoelectron spectroscopy(XPS). In addition, the nanocomposite showed superior peroxidase-like activity towards 3,3′,5,5′-tetramethylbenzidine(TMB) with a visual color change in the presence of hydrogen peroxide(H2O2). Therefore, the PFDDC nanocomposite provides a sensing platform for the colorimetric detection of H2O2 with high sensitivity and selectivity. Furthermore, the nano-composite can be conveniently preserved and separated. These features enable the nanocomposite to colorimetrically detect H2O2 for potential pharmaceutical, environmental and industrial applications.