Abstract
Polyanthranilic acid (PAA) was synthesized by the oxidative polymerization of anthranilic acid with potassium dichromate as an oxidant. The effect of inclusion of MnCl2, CoCl2, NiCl2, CuCl2 and FeCl3 on the thermal, spectral and optical properties of polyanthranilic acid has been studied. The results showed that the doped PAAs are thermally more stable than the pure PAA. The optical band gaps of the doped PAAs except Ni doped are smaller than the pure PAA. TG was carried out from room temperature to 1000 A degrees C. The decomposition temperature was determined from TG curves of the precursors. Fe-doped PAA has been used as a precursor for alpha-Fe2O3 nanoparticles by thermal decomposition route at 800 A degrees C. The obtained hematite has been characterized by XRD and TEM. The average size of the prepared nanoparticles was estimated as 48 nm. The optical band gap of synthesized hematite nanoparticles was measured and compared with the bulk.