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Abstract
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In the present work, we report the fabrication
and application of a sensitive nonenzymatic hydrogen
peroxide (H2O2) sensor, using a nanocomposite, based on
the nanodiamonds (NDs) decorated with silver nanoparticles
(AgNPs/NDs). The AgNPs/NDs nanocomposite was
prepared via a facile and efficient process. The field emission
scanning electron microscopy, transmission electron
microscopy, and X-ray diffraction were applied for characterization
of the obtained nanocomposite. The electrochemical
investigations have shown that the resulting AgNPs/
NDs nanocomposite modified electrode has strong electrocatalytic
activity toward H2O2 reduction which is attributed
to the NDs that promoted the formation, uniform distribution,
and electrocatalytic activity of the AgNPs. In the
optimum conditions, the linear response range of the constructed
H2O2 sensor was from 0.1 to 34.0 μM at applied
potential of −0.2 V with a detection limit of 0.01 μM
(S/N = 3). Also, the proposed sensor showed high sensitivity
of 1.59 × 106 μAM−1 and was applied to measure the
concentration of H2O2 in real samples. These results indicate
that the AgNPs/NDs nanocomposite with high conductivity
and stability has a promising potential in electrochemical
sensors development.
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