A fully roll-to-roll manufactured
electrochemical sensor with high
sensing and manufacturing reproducibility has been developed for the
detection of nitroaromatic organophosphorus pesticides (NOPPs). This
sensor is based on a flexible, screen-printed silver electrode modified
with a graphene nanoplatelet (GNP) coating and a zirconia (ZrO2) coating. The combination of the metal oxide and the 2-D
material provided advantageous electrocatalytic activity toward NOPPs.
Manufacturing, scanning electron microscopy–scanning transmission
electron microscopy image analysis, electrochemical surface characterization,
and detection studies illustrated high sensitivity, selectivity, and
stability (∼89% current signal retention after 30 days) of
the platform. The enzymeless sensor enabled rapid response time (10
min) and noncomplex detection of NOPPs through voltammetry methods.
Furthermore, the proposed platform was highly group-sensitive toward
NOPPs (e.g., methyl parathion (MP) and fenitrothion) with a detection
limit as low as 1 μM (0.2 ppm). The sensor exhibited a linear
correlation between MP concentration and current response in a range
from 1 μM (0.2 ppm) to 20 μM (4.2 ppm) and from 20 to
50 μM with an R
2 of 0.992 and 0.991,
respectively. Broadly, this work showcases the first application of
GNPs/ZrO2 complex on flexible silver screen-printed electrodes
fabricated by entirely roll-to-roll manufacturing for the detection
of NOPPs.
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