Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 213, Issue -, Pages 474-483Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.02.124
Keywords
N-doped graphene; Metallic nanoparticles decorated graphene; Peroxidase-like activity; Nanocomposites
Funding
- MEN-UEFISCDI [PN-II-PT-PCCA-2013-4-1282 (230/2014)]
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In this paper we present for the first time the catalytic activity of N-doped graphene toward a peroxidase substrate oxidation in the presence of hydrogen peroxide. In addition, the activity was compared with that of metallic nanoparticles decorated-graphene, achieved either by catalytic chemical vapor deposition with induction heating (CCVD-IH) or by chemical reduction of graphene oxide (GO). From all investigated graphene-based nanomaterials, the highest activity was exhibited by N-doped graphene and gold nanoparticles supported on chemically-reduced graphene oxide. The steady-state kinetic of the two nanocomposites was carried-out in order to evaluate their peroxidase-mimetic activity. Doping the graphene surface with nitrogen atoms led to a nanomaterial with a better affinity toward hydrogen peroxide compared to the natural enzyme (horseradish peroxidase). Additionally, the systematic study of the catalytic activity for a variety of graphene-based nanomaterials offered important findings for designing new nanomaterials with peroxidase-like activity. (C) 2015 Elsevier B.V. All rights reserved.
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