Synthesis of Mesoporous Polyaniline-TiO2 Composite Microspheres for Gas Sensing Application

The mesoporous polyaniline (PANI)-TiO2 composite microspheres were prepared by a facile hydrothermal method and characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) surface area. The XRD pattern suggested that PANI did not modify the crystal structure of TiO2 whereas PANI exhibited amorphous state. The SEM of PANI-TiO2 displayed for microspheres. The gas sensitivity of the PANI-TiO2 hybrid was also studied. The as-prepared sample was sensitivity to ammonia and ethanol and showed good reversibility. The PANI-TiO2 hybrid material exhibits high sensitivity (0.96) to ammonia (150ppm) when operates at 373K.