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    Sexual pheromone detection using PANI center dot Ag nanohybrid and PANI/PSS nanocomposite nanosensors

    Year: 2021

    Journal: Anal. Methods, Volume 13, SEP 21, page 3900–3908

    Authors: Martinazzo, Janine; Brezolin, Alexandra Nava; Paschoalin, Rafaella Takehara; Soares, Andrey Coatrini; Steffens, Juliana; Steffens, Clarice

    Organizations: National Council for Scientific and Technological Development - Brazil (CNPq); Coordination for the Improvement of Higher Education Personnel - Brazil (CAPES) [001]; Research Support Foundation of the State of Rio Grande of Sul - Brazil (FAPERGS); Finep

    In this study, polyaniline/poly(styrene sulfonate) (PANI/PSS) nanocomposite and polyaniline center dot silver (PANI center dot Ag) nanohybrid thin films were obtained in cantilever nanosensors surface. The developed films were characterized in relation to topography, roughness, thickness, height, and structural properties. The topography study revealed that both films have a globular morphology, thickness and height in nanoscale. The gas sensing performance was investigated for sexual pheromone from the neotropical brown stink bug, Euschistus heros (F.). The sensitivities of both nanosensors based on PANI/PSS nanocomposite and PANI center dot Ag nanohybrid films were similar. The PANI center dot Ag nanohybrid nanosensor had a limit of detection of less than 3.1 ppq and limit of quantification of 10.05 ppq. The nanosensor layers were analyzed by UV-vis and FTIR showing the incorporation of Ag nanoparticles in the nanohybrid. We found that pheromone compound was adsorbed in sensing layer resulting in a reduction in the resonance frequency. The detection mechanism help us understand the good results of LOD, LOQ, sensitivity, selectivity and repeatability. The presented device has great potential for detection of the sexual pheromone from E. heros.
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