Prolonged surface peroxidase-like activity of Fe3O4 nanoparticles/few-layered graphene composite: Elucidation using UV–Vis and ESR spectroscopy

Nanoengineered catalysts mimic natural enzymatic reactions such as peroxidase activity, which is helpful in biosensing, environmental remediation, etc. In this regard, peroxidase-like Fe3O4 nanoparticles/few-layered graphene (FLG) composite is shown to be an excellent material for simultaneous and h...

Full description

Saved in:
Bibliographic Details
Published inMicrochemical journal Vol. 217; p. 114810
Main Authors Patthi, Ranjith Reddy, Vilasrao, Rewatkar Vrushali, Battula, Lakshmi, Geo, Sarah, Satya Siva Srikanth Vadali, Venkata
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.10.2025
Subjects
Catalysis
ESR spectroscopy
Fe3O4
Graphene
Peroxidase
UV–Vis spectroscopy
Fe3O4
ESR spectroscopy
Peroxidase
Catalysis
Graphene
UV–Vis spectroscopy
Online AccessGet full text

Cover

More Information
Summary:Nanoengineered catalysts mimic natural enzymatic reactions such as peroxidase activity, which is helpful in biosensing, environmental remediation, etc. In this regard, peroxidase-like Fe3O4 nanoparticles/few-layered graphene (FLG) composite is shown to be an excellent material for simultaneous and high-precision sensing of dopamine, ascorbic acid, and uric acid. However, it is observed that the peroxidase-like activity of Fe3O4 nanoparticles/FLG composite is surprisingly prolonged and a subject of immense interest because catalytic systems with stable and prolonged activity are crucial for performance and cost-effectiveness in biosensing, environmental remediation, energy production, and biomedicine. This work elucidates the prolonged surface peroxidase-like activity of Fe3O4 nanoparticles/FLG composite using UV–Vis and ESR spectroscopic analysis. The peroxidase-like activity of Fe3O4/FLG composite is recorded by using 3,3,5,5-tetramethylbenzidine and o-phenylenediamine as peroxidase substrates in the presence of H2O2 and its mechanism is explained based on the experimental observations. [Display omitted] •Prolonged peroxidase-like activity of Fe3O4/few-layered graphene (FLG) composite.•Elucidation of prolonged peroxidase-like activity using UV–Vis and ESR spectroscopy.•Prolonged activity is due to Fe3+/Fe2+ ions as confirmed by ESR analysis.•FLG contributes to faster relaxation of spin states.
ISSN:0026-265X
DOI:10.1016/j.microc.2025.114810