N,N-dicarboxymethyl Perylene-diimide-modified CdV2O6 Nanorods for Colorimetric Sensing of H2O2 and Pyrogallol

The peroxidase-like activity of CdV2O6 nanorods has been considerably improved by modification with N, N-dicarboxymethyl perylene-diimide (PDI) as a photosensitizer. The peroxidase-like behaviors are evaluated by virtue of the color-less chromogenic substrate 3,3', 5,5'-tetramethylbenzidine (TMB), which is fast changed into blue oxTMB in the presence of H2O2 in only 90 s. PDI-CdV2O6 exhibits high stability at elevated temperatures and PDI-CdV2O6 retains more than 70% of its catalytic activity over a wide range of 15 to 60 degrees C. The catalytic mechanism of PDI-CdV2O6 is ascribed to the synergistic interaction between PDI and CdV2O6 and the generation of center dot O2(-) radicals. Based on the enhanced peroxidase-like activity of PDI-CdV2O6, a selective colorimetric sensor has been constructed for H2O2 and pyrogallol (PG) with detection limits of 36.5 mu M and 0.179 mu M, respectively. The feasibility of the proposed sensing platform has been validated by detecting H2O2 in milk and pyrogallol in tap water.

Automated summary

The peroxidase-like activity of CdV2O6 nanorods has been greatly improved through modification with N, N-dicarboxymethyl perylene-diimide (PDI) as a photosensitizer. The colorless chromogenic substrate 3,3', 5,5'-tetramethylbenzidine (TMB) is used to evaluate the peroxidase-like behaviors, which rapidly changes into blue oxTMB in the presence of H2O2 in just 90 s. PDI-CdV2O6 exhibits high stability at elevated temperatures and retains more than 70% of its catalytic activity over a wide temperature range of 15 to 60 degrees C.