Doping Nitrogen into Q‑Graphene by Plasma Treatment toward Peroxidase Mimics with Enhanced Catalysis
2020
A facile and efficient plasma treatment
strategy has been applied
for the first time to dope heteroatom nitrogen (N) into Q-graphene
(QG) under ambient temperature toward a carbon-based green nanozyme.
It was discovered that the resulting N doped QG (N-QG) nanozyme can
present the greatly enhanced catalysis activity, which is nearly 5-fold
higher than that of pristine QG, as comparably revealed by the kinetic
studies. Herein, the plasma treatment-assisted N doping could improve
the conductivity (hydrophilicity) and create the surface defects of
QG so as to promote the electron transferring toward the enhanced
catalytic activities of N-QG. Furthermore, the catalase, superoxide
dismutase, and oxidase-like catalysis activities of N-QG were explored,
indicating the N doping could endow the obtained nanozyme with a high
specificity of peroxidase-like catalysis. The application feasibility
of the developed N-QG nanozyme was demonstrated subsequently by the
catalysis-based colorimetric assays for H2O2 in milk samples, with the linear range from 2.00 to 1500 μM.
Importantly, such a plasma-assisted heteroatom doping route may open
a door toward the large-scale applications for the rational designs
of various enzyme mimics with improved catalysis performances.
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