Published Paper Details:

Incorporation of biosynthesis technique into nanotechnology is a significant step in nanoscience research because this green protocol of synthesizing nanoparticles is cost effective, quite safe and eco-friendly compared to the conventional chemical and physical methods. For these reasons, in recent years, this green and bio-based route for the preparation of nanoparticles has gained much attention, and many metal and metal oxide nanoparticles have been prepared by using this method in which plant source, bacteria, fungus and some biological materials are used. In this paper it is reported that the biosynthesis of Tin Oxide nanoparticles (SnO2-NPs) using guava leaf exact. Inorganic-organic hybrid nanocomposites are synthesized by dispersing nanosized SnO2 in the conducting polypyrrole matrix. The morphology of crystalline phase of nanocomposite was determined from Scanning Electron Microscopy (SEM), transmission electron microscopes (TEM) and X-ray diffraction (XRD) spectra. The average size of SnO2 nanoparticles was in the range of 15 nm and the observed morphology was spherical. Complex impedance and dielectric permittivity of SnO2-PPY nanocomposite have been investigated as a function of frequency and temperature at different compositions. The dielectric permittivity 3800 is observed. Large value of permittivity is well described by Maxwell-Wagner polarization. Broad and asymmetric dielectric spectra are analyzed by Harviliak - Nigami relaxation function.