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STUDIES ON PREPARATION OF BIOSYNTHESIS PVA COATED AZO NANOPARTICLE USING JUSTICIA ADHATODA EXTRACT AND ITS ANTIMICROBIAL ACTIVITY S.Sonia1, R.Kirthika Devi2. 1 Division of Nanoscience and Technology, Department of Physics. University College of Engineering, Anna University-BIT Campus, Tiruchirappalli. Mail id:[email protected]. A semiconductor with wide direct bandgap (3.37 eV) and large exciton binding energy(60 meV), ZnO has attracted considerable attention due to its unique piezoelectric, pyroelectric, catalytic and photocatalytic properties and its potential application in many fields such as gas sensor, piezoelectric transducer, electroluminescent, optoelectric devices and medical field.There are many methods by which ZnO could be produced; pulsed laser deposition, chemical vapor deposition, chemical bath deposition, magnetron sputtering, spray pyrolysis and sol-gel processes. Of the various methods, the biosynthesis process exhibits several advantages such as simplicity, low cost, low-processing temperature and without need for catalyst assistance. It can be performed on various substrates, which promotes its applications in versatile fields. Therefore it is the most promising method to synthesize of ZnO nanoparticles. For any nanoparticles, their performance and efficiency are strongly dependend on their structural, optical and electrical properties thus making the study of these properties very important and to help to optimize the nanoparticles parameters. Some interesting features have also been observed in ZnO nanoparticles upon doping; spintronics effect in Ag-doped ZnO coated with PVA for antimicrobial activity. Among various metal nanoparticles, silver nanoparticles established considerable attention because of their captivating optical, electronic, magnetic, catalystic, electrical, mechanical, and physicochemical properties that are notably dissimilar from those of bulk materials, depend upon their preparation and on the dielectric properties of the surrounding medium these properties can be varied. By using protecting agent, it is possible to manipulate the shape and size of Ag doped ZnO nanoparticles such as polyvinyl pyrrolidone(PVP), polyvinyl alcohol(PVA), sodium dodecylsulphate(SDS), cetyltrimethyl ammonium chloride(CTAC), poly(ethylene glycol)(PEG), polyacrylamide, starch, carboxymethyl cellulose sodium(CMC), β-cyclodextrin, poly(aryl ether)s (PAEs), and poly(propyleneimine). Here PVA polymers can act as nanoparticle stabilizers and complexing agents. Justicia adhatoda leaves contain high alkaloids and vasicine. It act us a reducing agent. In this paper, the prepared sample is characterized by XRD which confirmed the ZnO crystalline formation and UV Reflectance, PL spectrum,FTIR are studied in order to determine the optical property of the nanoparticle. AFM for the powder and SEM-EDAX, TEM for the PVA coated Ag doped ZnO nanoparticle has been done to study the surface morphology of the undoped and doped nanoparticles. A decisive result obtained from this study could open further avenues for scale up studies in biological applications. Keywords: PVA, AZO, Polymer