Date of Award
5-17-2005
Document Type
Thesis
Abstract
Spherical silver nanoparticles may be produced by the reduction of Ag (aq) by borohydride in the presences of citrate. When (phenylphosphinidene) bis-(benzenesulfonic acid) is also present, and the reaction mixture is illuminated, nonspherical Ag nanoparticles are formed. We have discovered that the shape of some Ag nanoparticles can be repeatedly changed by subjecting them to numerous cycles of light and dark. To our knowledge, this has never been reported in the literature. These photo chromic Ag nanoparticles displayed at least two different particle shapes: prismatic and spherical. The difference in morphology could be determined by the color of the solution and by the electronic spectra. The prismatic Ag nanoparticles can be photochemically synthesized in 24hrs and then converted into a spherical form by placing them in the dark for 14hrs. This transformation is accompanied by a blue shift in the visible spectrum. The prismatic particles are reformed by placing them in the light for 4 hrs. This transformation has a red shift in the visible spectrum.
Recommended Citation
Lee, George Patrick, "Formation and optical properties of photochromic silver nanoparticles" (2005). Chemistry and Biochemistry. 40.
https://ualaska.researchcommons.org/uaf_grad_chem_biochem/40
Handle
http://hdl.handle.net/11122/5913