A simple hydrothermal method of synthesis of Polyaniline Nano-fibers was presented. Thin films from PANI have been deposited via spin-coating technique on silicon substrate. The structural, morphological, optical and sensitive properties were Studied for prepared thin films. The XRD results exhibit that the prepared films show crystalline nature of polyaniline Nano-Fibers and that the crystallite size, evaluated by the Scherer formula, is about 30.1 nm. The FE-SEM image of Polyaniline proved that the film prepared have Nano fiber like structure. The optical measurements proved that the optical energy gap was found to be 2.88 eV. The H2S sensing properties of thin films were measured for various operating temperatures, The best sensitivity of 7.32% was observed when operating at a working temperature of 150 °C, also the fast response time and recovery time behavior have been achieved.
Nanocomposites of polyaniline (PANI) and Silver (Ag) nanoparticles (NPs) have been successfully synthesis using hydrothermal and chemical method respectively. The nanocomposite films were deposited by spin coating technique on Si substrates and examined using XRD, FE-SEM, EDX, FT-IR techniques as well as their sensing properties were studied towards H2S gas. The XRD pattern showed a presence of crystalline nature of PANI NFs film and cubic structure of PANI/Ag films. FE-SEM images revealed that PANI film has nanofibers structure, whereas the PANI/Ag films composite revealed that Ag NPs caped with PANI nanofiber. The sensing analysis indicated that on exposure to H2S gas at low concentration 25 ppm, it was observed that the PANI/Ag films sensor composite showed high sensitivity compared with pure PANI NFs, and the maximum sensitivity (73.35%) was obtained at 200 °C with faster response/recovery times < 1 sec.
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