The wide angle XRD of the PANI-nano-TiO2 powders is depicted in Fig.1 which indicates the typical PANI peaks with broad amorphous band for the samples with no TiO2 and the characteristic reflections of anatase(JCPDS-21-1272) for the composite. The crystalite size determined from the FWHM of main 101 reflection of TiO2is 75 nm. The transmission electron micrographs of these samples(Fig.2) indicate the average particle size of 100-105nm for the PANI50. There is an increase in the particle size due to the formation of PANI around the particles. It is interesting to note that the polymerization yield is slightly increased(see Table 1A) for PANI50 which indicates that polymerization is mainly initiated on the particle surface.
Table 1A
Synthesis of PANI–nano-TiO2composites with different composition
Fig. 1. X-ray diffraction of (A) PANI and (B) PANI with nano-TiO2.
Fig. 2. High resolution electron micrographs of PANI–TiO2particles seen embedded within the polymer. Magnification 30,000.
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