Controlling Silver Nanoparticle Size and Morphology with Photostimulated   Synthesis
  Photo-induced synthesis and control over the size and shape of colloidal silver nanoparticles is investigated in contrast to photo-stimulated aggregation of small nanoparticles into large fractal-type structures. The feasibility of light-driven nanoengineering which enables manipulation of the sizes and shapes of the isolated nanoparticles is studied by varying the amount and type of the stabilizing agent and the type of optical irradiation. 
A. K. Popov, J. Brummer, R. S. Tanke, G. Taft, A. Wruck, M. Loth, R.   Langlois and R. Schmitz