A facile solvothermal synthesis of 3D magnetic MoS2/Fe3O4 nanocomposites with enhanced peroxidase-mimicking activity and colorimetric detection of perfluorooctane sulfonate

• Published in: Microchemical journal 2019-09, Vol.149, p.104019, Article 104019
• Main Authors: Liu, Jing, Du, Jiaoyang, Su, Yan, Zhao, Huimin
• Format: Article
• Language: English
• Subjects: Colorimetric sensing; MoS2 nanoflowers; Peroxidase mimics; Simple synthesis
• ISSN: 0026-265X; 1095-9149
• DOI: 10.1016/j.microc.2019.104019

Recently, two-dimensional (2D) layered structural MoS2 has emerged as novel inorganic nanomaterials with excellent characteristics especially of its tunable bandgap applicable to the field of catalysis. Owing to the inherent basal surface catalytic inertia and instability of 2D MoS2, methods of coupling with other functional materials or exploiting three-dimensional (3D) structure have been developed. Here, we report a facile preparation process of 3D MoS2-based nanomaterials with remarkably enhanced peroxidase-like catalytic activity, magnetic separation, cost-effective and high yield, which is of great significance for the construction of colorimetric sensors. All SEM and TEM images showed a 3D flower-shaped morphology of our prepared MoS2 with Fe3O4 nanoparticles (NPs) anchored on the “petals”, so called MoS2/Fe3O4 nanocomposites. The absorbance plots confirmed higher catalytic property of nanocomposites, taking MoS2, Fe3O4 NPs and a blend of the two by physical method as comparison. And this robust catalytic activity was utilized to achieve hypersensitive colorimetric sensing method for detecting perfluorooctane sulfonate (PFOS) with the linear relationship between absorbance and PFOS concentrations, ranging from 0.1 to 12.5 μM, and the limit of detection (LOD) was 8.6 nM (3σ/k). •3D magnetic MoS2 nanoflowers with remarkably enhanced peroxidase-like property were synthesized via a solvothermal route.•We verified that the Fe3O4 NPs reduced the Fermi level of the nanocomposites, thus accelerating the electron transfer.•A simple colorimetric sensing platform for detection PFOS was designed and constructed.•The sensing platform showed a good linear relationship with PFOS concentration ranging from 0.1 to 12.5 μM.