Abstract
Porous silver spheres were successfully prepared by reducing silver-ammonia solution and using rape pollen as novel bio-templates. The synthesized porous silver spheres with diameter of 50 μm have nanoparticles of ca. 25 nm. The samples were characterized by X-ray diffraction, scanning electron microscope (SEM), and transmission electron microscope (TEM) techniques. The thermal and electrical properties were also studied. We find that the reaction temperature and AgNO3 concentration have important influence on the morphology and electrical properties of the final products. TEM observations showed that the as-synthesized products are composed of nanoparticles with size around 25 nm. Volume resistivity results revealed that the volume resistivity was decreased with increasing the amount of AgNO3 concentration. The volume resistivity of porous silver was decreased two orders of magnitude while the AgNO3 increased twice.
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