Abstract
Pure TiO2 nanoparticles were synthesized using the sol-gel method and polyaniline (PANI), while PANI/TiO2 (content TiO2:25 % and 50 %) nanocomposites were synthesized by using in-situ chemical oxidative polymerization method. X-RD, FTIR spectroscopy, and scanning electron microscopy (SEM) were used for the structural analysis, elemental composition, and surface morphology. The XRD patterns of PANI/TiO2(25 %,50 %) composites reveals that the relative intensity of diffracted peaks increases with increasing the content of TiO2 indicating an increase of crystallinity in such case. FTIR confirmed the presence of functional groups in the nanocomposite. In SEM surface morphology observed that highly porous nanograins are formed. The average particle sizes of PANI/TiO2(25 %) 339 nm and PANI/TiO2(50 %) 196 nm were obtained. The resistance change response of nanocomposite material were done by using a static two-probe unit by exposure to ammonia (NH3) gas. The maximum sensitivity of PANI/TiO2(50 %) nanocomposite was achieved on 500 ppm (parts per million) of ammonia gas at 40 °C. The fast response time (20 s.), and recovery time (28 s.) has obtained.
Published Version
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