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Preparation and optical properties of colloidal silver nanoparticles at a high Ag+concentration Abstract We have prepared colloidal silver nanoparticles by reducing a high molar concentration of AgNO3(up to 0.735 M) with glycerol in the presence of m-phenylenediamine. These silver nanoparticles had anisotropic shapes, including truncated rectangles, truncated triangles, and spheroid-type particles. The UV¨CVis spectra of these nanoparticle systems display two distinct plasmon modes and a shoulder that correspond to the in-plane dipole, in-plane quadruple, and out-of-plane dipole resonances, respectively. The size and coating thickness of the nanoparticles are controllable while retaining their size distribution. We have used scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and, UV¨CVis spectroscopy to characterize the silver products obtained. һƬÀÏÎÄÕÂÄÃÀ´É¹Ò»É¹ |
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