Ternary FeSx/MoS2@rGO nanocomposites with heterostructure as artificial nano-peroxidase for enhanced peroxidase-like activity

To obtain highly sensitive and selective artificial nano-peroxidase, the ternary FeSx/MoS2@rGO nanocomposite with heterostructure was successfully fabricated by hydrothermal reaction in this work. Compared with FeSx@rGO, MoS2@rGO and single component, ternary FeSx/MoS2@rGO nanocomposite exhibits the enhanced peroxidase-like activity due to the unique heterointerface between FeSx and MoS2, in which FeII and FeIII in FeSx could activated H2O2 to generated •OH radical owing to Fenton-like reaction, meanwhile, Mo can also catalyze the conversion reaction of FeII and FeIII·As an optimal collaborative consequence, FeSx/MoS2@rGO nanocomposite exhibits two response ranges for H2O2 sensing in the range of 1–150 μM and 150−500 μM, and the corresponding limit of detection (LOD) are 0.17 μM and 0.51 μM, respectively, being lower than those of most reported relevant nanozymes. [Display omitted] •Ternary FeSx/MoS2@rGO heterostructure as artificial nanoperoxidase.•The FeSx/MoS2@rGO shows the excellent peroxidase-like activity.•The FeSx, MoS2, rGO and heterointerface together enhanced the peroxidase-like activity due to Fenton-like reaction and rapid conversion reaction.•FeSx/MoS2@rGO exhibits two response ranges for H2O2 sensing.