Abstract-In the present work polyindole based nickel-zinc oxide nanocomposite was prepared. Here nickel-zinc oxide was prepared separately in presence of capping agent using well known co-precipitation method. Polyindole based nickel-zinc oxide nanocomposite was prepared using chemical oxidation method. Polyindole and nickel-zinc oxide was also prepared separately to compare their properties with their counterparts. The samples have been analysed using SEM, FTIR, XRD techniques. Polyindole showed a cauliflower like pattern in SEM picture and the surface morphology was changed entirely in the case of nanocomposite. FTIR showed the vibration bands of both polyindole and nickel-zinc oxide in the nanocomposite. From the XRD spectrum the particle size was calculated using Scherrer's equation. The dielectric properties of these materials were studied and the dependence of dielectric constant and a.c conductivity with frequency of these samples were analysed. Antifungal activity of the nanocomposite and their counterparts were studied separately on the fungi Penicillium Chrysogenum. The nanocomposite showed activity of 1 cm, nickel -zinc oxide showed 0.7 cm activity, whereas polyindole, nickel oxide and zinc oxide showed no activity.

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The present study is focused on the comparison of structural and photocatalytic degradation activities of nanocomposite of MgO formed with rice straw, a biopolymer. For comparison, counter parts were also synthesized. Nanoparticles of magnesium oxide were synthesized through controlled co-precipitation method in presence of citric acid. Structural characterizations of all the synthesized samples were carried out using XRD. Comparison of XRD of metal oxide with JCPDS confirmed that the formed metal oxide was MgO. Photocatalytic degradation of organic dyes Congo Red, an acidic dye and Methylene Blue, a basic dye was done.

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