In the present approach,
a Cr
2
O
3
–TiO
2
-modified, portable,
and biomimetic nanosensor was designed
to meet the requirement of a robust and colorimetric sensing of hydrogen
peroxide. Cr
2
O
3
–TiO
2
nanocomposites
prepared via the hydrothermal method were fabricated as a transducer
surface on the filter paper using the sol–gel matrix. The color
on the filter paper sensor changed from green to blue upon the addition
of hydrogen peroxide in the presence of TMB. This change in the color
intensity was linear with the concentration of H
2
O
2
. RGB software was used as a color analyzing model to evaluate
the optical signals. This paper-based colorimetric platform provided
us with an improved analytical figure of merit with a linear range
of 0.005–100 μM with 0.003 μM limit of detection.
The real sample analysis and excellent anti-interference potential
results proved the good analytical performance of the proposed design,
providing a more promising tool for colorimetric H
2
O
2
detection. Introducing Cr
2
O
3
–TiO
2
nanocomposite-based paper sensors, being a novel method for
optical and colorimetric detection, can pave the way for the development
of other sensing devices for the detection of different analytes.
Rapid methyl parathion detection was measured using a fabricated glassy carbon electrode (GCE) sensor designed using the layer-by-layer (LBL) method. Multilayer assemblies were developed on the glassy carbon electrode by alternating depositions of anions and cations in which a Dawson Type Polyoxometalate β-K6[(P2W18O62·H2O)]·14H2O (∼P2W18 POM) and polyethyleneimine (PEI) stabilized silver nanoparticles (∼PEI-AgNPs) acted as anions and cations, respectively. The redox behavior of P2W18 POM within LBL assembly was carried out via cyclic voltammetry. This LBL assembly was thoroughly characterized by UV-Visible, FT-IR, XRD, AFM, and SEM techniques. The fabricate GCE sensor was investigated for the electrocatalytic activity to detect methyl parathion. The results clearly showed that the fabricated GCE sensor was successfully synthesized. More interestingly, the current response for detecting methyl parathion was found to be less than 1 ppm, proving that this fabricated GCE sensor may exhibit potential applications in the detection of targeted pesticide.
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