Rapidly developing electronics industry is striving for higher energy-storage capability dielectric capacitors for pulsed power electronic devices. Both high dielectric permittivity and high dielectric breakdown strength are essential properties to meet the desired device performance. However, due to materials limitations and their preparation requirements, there are significant challenges which limit the use of current dielectrics in high-energy storage capacitors. In addition material limitations such as, low dielectric permittivity, low breakdown strength, and high hysteresis loss decrease these materials' energy density and efficiency, restricting potential applications. Thus, a thorough understanding of the implementation, optimization and limitations of ferroelectric, relaxor-ferroelectric, and anti-ferroelectric thin films in high-energy storage dielectric capacitors is an essential and important research topic for the incorporation of these materials in near future applications.

Silver nanoparticles (AgNPs) were prepared under mild conditions by exploiting a combination of naturally abundant polymer starch and trisodium citrate as reducing agent and stabilizing agent. Optimization of the concentration of starch, citrate, pH, and reaction time showed significant influence on the size of the NPs. The obtained NPs were well characterized by UV-Vis, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and thermogravimetric analy-sis. The effect of varying proportions of citrate and starch and the order of their addition to the reaction mixture with respect to their role as reducing or, and stabilizing agents was also studied. The antibacterial activity of thus prepared NPs is being reported. V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 126: E154-E161, 2012

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