Authors : S. H. Nimkar, S. B. Kondawar and P. S. More
Page Nos : 12-18
Description :
Abstract:
Polyaniline (PANI) and Titanium dioxide (TiO2) nanocomposite thin film based chemiresistor type gas sensors synthesized by solution route technique helps to monitor carbon dioxide (CO2) gas present in atmosphere with high concentration at low temperature. Thin films of titanium dioxide-intercalated polyaniline nanocomposites have been deposited, through solution route technique on simple glass using hydrogen peroxide (H2O2) and ammonium persulphate (APS) in acidic medium at 0-5o C. The thin film was studied for some of the useful physicochemical properties, making use of XRD, FTIR, SEM, UV-Vis spectra and DC conductivity etc. Morphological and structural studies were done with SEM and XRD respectively which confirm the formation of nanocomposites. PANI/TiO2 nanocomposites images showed that the growing of PANI on TiO2 nanoparticle surfaces. FTIR and UV-Vis spectra reveal that the PANI component undergoes an electronic structure modification as a result of the TiO2 and PANI interaction. On exposure to fixed concentration of carbon dioxide gas (1000 ppm in air) at room temperature, it was found that the nanocomposites (PANI /TiO2) thin film resistance increases from the respective unexposed value.
Keywords: Conducting polymer, Polyaniline, Titanium dioxide, nanocomposites, thin film, CO2 gas sensor.
