Strong coupled palladium nanoparticles decorated on magnetic graphene nanosheets as enhanced peroxidase mimetics for colorimetric detection of H2O2. (February 2016) - Li, Siliang
Abstract: Herein Pd/Fe3 O4 -PEI-RGO nanohybrid was synthesized by dispersion of Pd NPs and Fe3 O4 NPs on PEI modified graphene oxide sheets. This nanohybrid was found to possess superior peroxidase-like activity, and could efficiently oxidize 3, 3′, 5, 5′-Tetramethylbenzidine (TMB) by hydrogen peroxide (H2 O2 ) to produce a color reaction. Therefore, this provides a sensing platform for the colorimetric detection of H2 O2 in solution. The linear range for H2 O2 was from 0.5 to 150 μM and the limit of detection was as low as 0.1 μM. Moreover, the nanohybrids have the advantages of facile preservation and rapid separation. More importantly, comparing with the other catalysts (PEI-RGO, Fe3 O4 -PEI-RGO and Pd-PEI-RGO), this nanohybrid exhibits the enhanced peroxidase catalytic activity. Thus, it is expected that this nanohybrid could conveniently and efficiently detect H2 O2 in the pharmaceutical, environmental and industrial fields. Graphical abstract: We reported as-synthesized Pd/Fe3 O4 -PEI-RGO nanohybirds as enhanced peroxidase mimetics for the colorimetric detection of H2 O2 in solution. Highlights: Pd/Fe3 O4 -PEI-RGO was synthesized by dispersion of Pd NPs and Fe3 O4 NPs on GO sheets. Pd/Fe3 O4 -PEI-RGO provides a sensing platform for the colorimetric detection of H2 O2 . Pd/Fe3 O4 -PEI-RGO has the advantages of facile preservation and rapid separation. Pd/Fe3 O4 -PEI-RGO has the enhanced peroxidase catalytic activity.