The
wide use of pesticides in agriculture makes necessary the development
of cost-effective, easy, and rapid methods aiming for environmental
and health protection. We propose the fabrication and investigation
of layer-by-layer (LbL) films composed of reduced graphene oxide stabilized
in polyelectrolytes in the presence and absence of gold nanoparticles
(AuNPs) toward methyl parathion (MP) detection. In addition to the
film assembly and sensing application, we performed a systematic investigation
of the influence of MP distribution on the limit of detection and
linear range of the sensor. Indium tin oxide (ITO) electrodes modified
with the LbL films were applied by differential pulse voltammetry
achieving an LOD and a linear range of 0.226 ppm and 0.25–40
ppm in the absence of AuNPs, while in the their presence, a wider
linear range was achieved (0.5–60 ppm, with LOD of 0.770 ppm).
Real sample analysis indicated potential application in water, ground,
and vegetables, with recovery varying from 92% to 113%.
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