Abstract
The rapid transformation and synthesis of metal nanoparticles which reaction completes within 5 min by a photocatalytic nanostructured silicon (Si) surface is studied. The Si substrate provides excess electric carriers to the surface upon optical illumination, directly inducing redox reaction. Spherical silver (Ag) nanoparticles transform into prism shape in less than 5 min with only water and room light illumination. Direct synthesis of gold (Au) nanoparticles from gold chloride (AuCl3) solution is also demonstrated. The size and distribution of the Au nanoparticles are controlled primarily by the concentration of the applied gold chloride solution. The rapid direct redox reaction capability shown from the Ag and Au nanoparticle experiments opens additional applications for the proposed photocatalytic device.
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