Synergistically enhanced peroxidase-like activity of Pd nanoparticles dispersed on CeO2 nanotubes and their application in colorimetric sensing of sulfhydryl compounds
Source abstract
Abstract
In this work, we proposed a new hybrid of Pd nanoparticles dispersed on CeO2 nanotubes (Pd NPs/CeO2 NTs) with synergistically enhanced peroxidase-like activity for the visual detection of sulfhydryl compounds. In comparison with individual Pd NPs and CeO2 NTs, the Pd NPs/CeO2 NTs hybrid exhibited a synergy effect to trigger the oxidation of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to its blue product TMBox mediated by H2O2. It was further demonstrated that the improved activity observed in Pd NPs/CeO2 NTs originated from the strong interplays between Pd NPs and CeO2 NTs, which could significantly increase the Ce3+/Ce4+ ratio. Besides, sulfhydryl compounds were found to have the capacity to suppress the color reaction of TMB + H2O2 catalyzed by the Pd NPs/CeO2 NTs nanozyme at a low level. Based on this principle, mercaptoacetic acid in the concentration range of 66–400 nM could be linearly determined. Similarly, sulfhydryl-containing amino acid (cysteine) and its derivative (glutathione) in the linear scope of 6–40 nM were also detected, providing a detection limit down to 2.9 and 11.3 nM, respectively.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Nanomaterials in Catalysis · Electrochemical sensors and biosensors · Advanced biosensing and bioanalysis techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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