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Environmental free approach or green chemistry synthesis of metallic nanoparticles has become new growing branch of nanobiotehnology. In this present work a simple and environmental free biosynthesis silver nanoparticles (AgNPs) were prepared using Musambi Peels (MPs) aqueous extract as the reducing agent guided by the principles of green chemistry. The fruit waste aqueous extract was challenged with silver nitrate solution for the production of AgNPs in room temperature. The crystalline phase and morphology of AgNPs were determined from UV-Vis spectroscopy, Fourier transform infrared (FTIR) spectra, X-raydiffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS).The UV-Vis spectrum indicated that the surface plasmon broad peak was observed nearby 450 nm throughout the reaction 30min-24h. XRD spectrum revealed that the average size of biowaste mediated AgNPs obtained approximately 46 nm by using the Debye-Scherrer equation. SEM image of AgNPs showed uniformly distributed on the surface of the cell with high agglomeration. EDS analysis revealed that the presence of silver was confirmed from the Ag peaks at 2.8-3.7 keV. In addition, the biowaste mediated AgNPsloaded disk were tested for antibacterial properties against Escherchia coli and Staphylococcus aureus and found that the obtained metallic AgNPs have been good antibacterial material for biological applications.

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Barium doped hafnium oxide nanoparticles were synthesized by an easy co-precipitation method. FTIR analysis and EDX investigation shows the purity and stoichiometric composition of hafnium oxide nanoparticles. XRD investigation exhibit the as synthesized nanoparticles are amorphous in nature and calcined barium doped hafnium oxide nanoparticles have the monoclinic phase structure with the mean crystallite size was around 15 nm. TEM analysis shows the development of crystalline Nano-rods. The Nano-rod formations signify the possibility of its use in applications of sensor. Ultra violet visible spectroscopy investigation shows that the band gap of the nanoparticles is noticed between 5.4 -5.14 eV. The visible and NIR of barium doped hafnium oxide nanoparticles indicated high reflectance, which may possibly be employ as an antireflection coating in solar cells applications and high absorbance ultra violet region signify the viability of make use of the prepared nanoparticles  could be used in Opto-electronic device applications.