Sensors nanofiber application areas

The vapor phase chemical deposition of PPy on the surface of the electrospun PVA nanofibers was successfully performed. Morphology of the nanofibers and successful deposition of the PPy onto the nanofibers is governed by the oxidant type and its concentration in the electrospinning solution. At the best studied condition, a layer of PPy with the thickness of 1,000 nm is formed onto the PVA nanofibers surface using ammonium persulfate as oxidant. In contrast, surface coating was not observed in the case of FeClj as oxidant. The electrical conductivity of the coated nanofiber mats depends on the coating conditions and reaches to 10 S/cm. Large surface area of the sensor material with the electrochemical activity is one of the most important properties for sensor application. Since, it is obvious that the surface area of PPy coated non-... 

In comparison with other nanomaterials, electrospun nanofibers are featured with good continuity, extremely large length-to-diameter ratio, high surface-area-to-volume ratio, and ease of surface functionalization. Meanwhile, multiple extra functions can be incorporated into electrospun nanofibers fo broaden their significances in applications. Because of this, we have found in the open literature that more than 50 polymers have been successfully fabricated into sensors, involving polyamide-6 (PA-6), polyamide-6,6 (PA-6,6), polyacrylonitrile (PAN), polyurethane (PU), poly(acrylic acid) (PAA), Ti02, ZnO, cellulose acetate (CA), polyethylene oxide (PEO), polystyrene (PS), poly(vinylidene fluoride) (PVdF), etc. (Fig. 11.1). 

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