Triangular silver nanostructures were prepared by photoinducing of spherical silver nanoparticles (NPs) with an average diameter of 10 nm. Transmission electron microscopy (TEM) and ultra violet visible (UV-Vis) spectroscopy were used to characterize silver triangles. TEM images indicated that formation of triangular structures depends on the intensity of light source.Spherical silver NPswere first synthesized by reducing silver nitrate (AgNO3) with sodium borohydride (NaBH4) in the presence of polyvinyl pyrrolidon (PVP) and trisodium citrate (Na3C6H5O7). We have found that uniform triangular silver nanostructures can be obtained using an appropriate visible-light illumination to the primary spherical silver NPs. The effect of intensity of visible-light source on the geometry and size distribution of silver triangles was investigated. It was found that formation of triangular structures strongly depends on the intensity of the light illumination.
