Journal
POLYMERS
Volume 14, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/polym14091686
Keywords
chitosan; titanium dioxide; interface layer; dielectric spectroscopy; cyclic voltametric; imidacloprid
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Funding
- CONACYT, Mexico [A1-S-9557]
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The properties of chitosan-TiO2 nanocomposites for detecting toxic insecticides were studied in this work. It was found that the best sensitivity to imidacloprid was achieved with a modified electrode using a chitosan-TiO2 nanocomposite with 40 wt.% of TiO2 nanoparticles. The study also showed that the interface volume fraction of the nanocomposites reached a maximum at 40 wt.% of TiO2.
The detection of toxic insecticides is a major scientific and technological challenge. In this regard, imidacloprid is a neonicotinoid that is a systemic insecticide that can accumulate in agricultural products and affect human health. This work aims to study the properties of chitosan-TiO2 nanocomposites in which nanoparticles with high surface area serve as molecular recognition sites for electroanalytical imidacloprid detection. We show that the best sensitivity to imidacloprid was obtained using a modified electrode with a chitosan-TiO2 nanocomposite with a 40 wt.% of TiO2 nanoparticles. By using a three-phase effective permittivity model which includes chitosan, TiO2, an interface layer between nanoparticles and a matrix, we showed that nanocomposites with 40 wt.% of TiO2 the interface volume fraction reaches a maximum. At higher nanoparticle concentration, the sensitivity of the sensor decreases due to the decreasing of the interface volume fraction, agglomeration of nanoparticles and a decrease in their effective surface area. The methodology presented can be helpful in the design and optimization of polymer-based nanocomposites for a variety of applications.
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