Download STUDIES ON PREPARATION OF BIOSYNTHESIS PVA COATED

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