Chemical-reducing and capping reagents are widely used in synthesizing metal oxide nanoparticles (NPs) which limit the biomedical applications. Researchers have recently found the eco-friendly technique of green synthesis which enhances the unique physical and chemical properties of nanomaterials. In this critique, we discuss green route to synthesize metal oxide NPs and its significant applications in various fields of energy and environment, aerospace, medicine, biotechnology, etc. This study arouses to provoke new research design of approach to synthesize NPs for various technological applications. In this review, most of the metal oxide NPs and different plant extracts with enhanced properties for their potential applications are discussed which confirms plant extracts as a potential candidate to be used as a reducing and capping agent.
Investigation on non-linear optical property of zinc and barium based fluorotellurite glasses based on open aperture Z-scan technique and its application as an optical limiter is reported. Changes in various parameters like polarizability, refractive index and molar refractivity have been attributed to the presence of barium/ zinc atoms and their impact on modifying the structure. Formation of nonbridging sites owing to fluorine doping have been explored based on Raman measurements. Open aperture data shows reverse saturable absorption behaviour and is attributed to the two-photon absorption process. Non-linear absorption values are found to increase with doping of both barium fluoride and zinc fluoride which has been attributed to the formation of non-bridging fluorine sites alongwith the polarizability of barium atoms. Effect of non-bridging fluorine sites on modifying the optical properties have been justified based on the energy bandgap values. Samples show comparably good optical limiting thresholds with a value of 2.59×10 12 W m −2 for the sample with highest fluorine concentration, which enables them to be used as limiting devices.
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