detection of napropamide by microwave resonator sensor using carbon nanotube – polypyrrole - chitosan layer

This paper presents the design and fabrication of a proximity coupled feed disk resonator coated with multi walled carbon nanotubes (mwcnts) and polypyrrole-chitosan (ppy-chi) layers as a napropamide sensor. computer simulation technology (cst) microwave studio was used to obtain the best design of the disk resonator and feed line position in a 5 ghz resonant frequency. also, mwcnts-ppy-chi layers were coated on the disk resonator using electric field deposition, and the chemical interaction between the sensing layer and napropamide was investigated via a fourier transform infrared spectroscopy (ftir). the evaluation of the system was performed using different concentrations of commercial napropamide and pure napropamide at room temperature (25 ⁰c). the experimental results proved that the proximity coupled feed disk resonator that was coated with mwcnts-ppy-chi layers was simple, fast (measurement- time=5 seconds), accurate (as low as 0.1 ppm), and low cost; it also has the potential to be produced as a portable instrumentation system for detecting napropamide in water and soil.