A 3-dimensional C/CeO2 hollow nanostructure framework as a peroxidase mimetic,and its application to the colorimetric determination of hydrogen peroxide

摘要

Various 3-dimensional C/CeO2 hollow nanostructure frameworks(3D C/CeO2 HNFs)were synthesized by using a polymer blowing process that is accelerated by adding a certain amount of cerium nitrate.Polyvinylpyrrolidone was used as the polymer.The resulting HNFs were characterized by scanning electron microscopy,energy dispersive spectrometry,X-ray diffraction,and X-ray photoelectron spectroscopy.The HNFs possess a large specific surface area,and the CeO2 nanocrystals consist of a single phase.The HNFs display intrinsic peroxidase-like activity and can catalyze the oxidation of the peroxidase substrate 3,3',5,5'-tetramethylbenzidine in the presence of H2O2 to produce a blue product.The method was applied to the quantification of H2O2 with a 5.2 nM detection limit.The analytical range is from 10 nM to 1 μM.