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: From last two decades, extensive research is going on metal and metal oxide nanoparticles and their application in field of medical, cosmetic, catalyst, packaging, photonics, agriculture and electronics. However, these nanoparticles show toxicity to the environmental, human and animal health. The toxicity effects of nanoparticles are mainly due to its size which can be easily pass through physiological barriers and the other due to the synthesis procedure. The toxicity due to their size cannot be avoided but toxicity due to synthesis process can be nullified by adopting biosynthesis process. Bacteria, fungus, fish scales, plant extracts and algae are used to synthesize metal and metal-oxide nanoparticles such as silver, gold, iron-oxide, zinc-oxide, zirconia, etc. From last a few year researchers are working on plant extracts synthesis methods to produce stable, cost-effective and economical these nanoparticles. In this review, we focus on biosynthesis of nanoparticles using different parts of plant extracts. The review contains summary of selected papers from 2018 – 20 with detail description of process of synthesis, mechanism, characterization and their application in various fields of biosynthesized metal and metal oxide nanoparticles.

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A new blue emitting material containing quinoline is designed, synthesized and characterized. The material has been prepared by well-known reaction such as Friedlander condensation reaction at 140 °C. The blended thin films of Trichloro-DPQ with poly (methyl methacrylate) (PMMA) at different weight % concentrations such as 10, 5, 1 and 0.1 weight % have been prepared. The structural characterization has been done by FTIR spectra. The synthesized polymeric compound demonstrates emission in blue region at 460 nm in powder form. At different weight % concentrations, there is emission at 444 nm with varying intensity. The light emitting and optoelectronic property of polymeric compound may find application in electroluminescence, OLED and sensors.