The rapid and green formation of spherical and dendritic silver nanostructures\r\nbased on microwave irradiation time was investigated. Silver nanoparticles were\r\nsuccessfully fabricated by reduction of Ag+ in a water medium and using\r\npolyvinylpyrrolidone (PVP) as the stabilizing agent and without the use of any other\r\nreducing agent, and were compared with those synthesized by conventional heating\r\nmethod. UVââ?¬â??vis absorption spectrometry, transmission electron microscopy (TEM),\r\natomic absorption spectroscopy (AAS) and photon correlation spectroscopy (PCS)\r\nmeasurements, indicated that increasing the irradiation time enhanced the concentration of\r\nsilver nanoparticles and slightly increased the particle size. There was a lack of large silver\r\nnanoparticles at a high concentration, but interestingly, the formation and growth of silver\r\ndendrite nanostructures appeared. Compared to conventional heating methods, the silver\r\nnanoparticle suspension produced by irradiated microwaves was more stable over a\r\nsix-month period in aqueous solution without any signs of precipitation.
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