Journal
MATERIALS
Volume 12, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/ma12040666
Keywords
graphene; nitrogen-doped graphene; pulse laser deposition; electrochemical analysis; oxygen peroxide oxidation
Categories
Funding
- program PEPS Risques et Environnement 2016 of Universite de Lyon-CNRS (PEPS 3D-GraPS)
- LABEX MANUTECH-SISE of Universite de Lyon, within the program Investissements d'Avenir [ANR-10-LABX-0075, ANR-11-IDEX-0007]
- CAMPUS FRANCE, through PHC Maghreb [39382RE]
- ministry of Science, Research and Technology, Islamic Republic of Iran-Department of Scholarships and Overseas Students' Affairs
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Graphene-based materials are widely studied to enable significant improvements in electroanalytical devices requiring new generations of robust, sensitive and low-cost electrodes. In this paper, we present a direct one-step route to synthetize a functional nitrogen-doped graphene film onto a Ni-covered silicon electrode substrate heated at high temperature, by pulsed laser deposition of carbon in the presence of a surrounding nitrogen atmosphere, with no post-deposition transfer of the film. With the ferrocene methanol system, the functionalized electrode exhibits excellent reversibility, close to the theoretical value of 59 mV, and very high sensitivity to hydrogen peroxide oxidation. Our electroanalytical results were correlated with the composition and nanoarchitecture of the N-doped graphene film containing 1.75 at % of nitrogen and identified as a few-layer defected and textured graphene film containing a balanced mixture of graphitic-N and pyrrolic-N chemical functions. The absence of nitrogen dopant in the graphene film considerably degraded some electroanalytical performances. Heat treatment extended beyond the high temperature graphene synthesis did not significantly improve any of the performances. This work contributes to a better understanding of the electrochemical mechanisms of doped graphene-based electrodes obtained by a direct and controlled synthesis process.
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