Semiconductors materials have the conducting properties in between conductors and insulators. They have wide range of applications in the field of electronics and optoelectronic devices. Silicon compounds are mainly used as semiconducting materials, but the method of production is very costly. Hence, the organic semiconductors materials can be considered, because of cheap raw materials for synthesis and their mode of construction or design. One of the organic semiconductors like Polyaniline (PANi) can be considered because of its aromatic ring and lone pair of electrons on nitrogen for conducting electricity. It is a cheaper cost, easily synthesizable and environmentally stable compound, with exciting electrochemical, optical and electrical properties. The synthesis was done by oxidation of aniline using hydrochloric acid HCl and ammonium persulphate (APS), which forms an emeraldine base EB. It was characterized by FESEM, XRD, FT-IR and UV-Vis Spectrophotometer.
Nanocrystalline titanium dioxide (TiO 2 ) thin films were prepared by using sol-gel through spincoating method. An assembly of indium tin oxide (ITO)/TiO 2 /polyaniline (PANI)/Ag was made in a sandwich panel structure. The obtained junction shows rectifying behavior. Additionally, the I/V characteristic indicates that a P-N junction at nanocrystalline PANI/TiO 2 interface has been created. In this experimental study, we depended only on the ratio between titanium and PANI in the process of preparing sol-gel (PANi/TiO 2 at 20% wt). The largest open circuit voltage of 656 mV and short current density of 0.00315 mΑ/cm 2 produce 0.0004% power conversion solar cell (η) under simulated solar radiation (50 mW/cm 2 ). The thin films of PANI and titanium oxide (TiO 2 )/ PANI composites were synthesized by sol-gel technique. Pure TiO 2 powder with nanoparticle size of less than 25 nm and PANI were synthesized through chemical oxidative polymerization of aniline monomers. The composite films were characterized by high resolution X-ray diffraction, Fourier transform infrared spectroscopy, field effect scanning electron microscopy, and UV-vis spectroscopy. The results were compared with the corresponding data on pure PANI films. The intensity of diffraction peaks for PANI/TiO 2 composites is lower than that for TiO 2 . The characteristic of the FTIR peaks of pure PANI shifts to a higher wave number in TiO 2 /PANI composite, which is attributed to the interaction of TiO 2 nanoparticles with PANI molecular chains.
In this work study preparation, structural, optical and electrical properties of polyaniline (PANi), nanocrystalline TiO2 and PANi: TiO2 nanocomposites. The TiO2 powder of particle size 50-60 nm was synthesized by sol-gel technique and the polyaniline was synthesized by chemical oxidative polymerization of aniline. The composite films were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared (FTIR) and UV-Vis spectroscopy and the results were compared with polyaniline films. The intensity of diffraction peaks for PANi: TiO2 composites are lower than for TiO2. The characteristic FTIR peaks of PANi were found shift to higher wave number in PANi: TiO2 composite. These observed effects have been attributed to interaction of TiO2 particles with PANi molecular chains.
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