Abstract
Anisotropic silver nanoparticles (NPs) have been synthesized rapidly using microwaveirradiation by the decomposition of silver oxalate in a glycol medium using polyvinylpyrolidone (PVP) as the capping agent. The obtained Ag nanoparticles havebeen characterized by UV–visible spectroscopy, powder x-ray diffraction (XRD),transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) studies.Anisotropic Ag nanoparticles of average size around 30 nm have been observed in thecase of microwave irradiation for 75 s whereas spherical particles of a size around5–6 nm are formed for 60 s of irradiation. The texture coefficient and particle sizecalculated from XRD patterns of anisotropic nanoparticles reveal the preferentialorientation of (111) facets in the Ag sample. Ethylene glycol is found to be amore suitable medium than diethylene glycol. A plausible mechanism has beenproposed for the formation of anisotropic Ag nanoparticles from silver oxalate.
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