COLL 371 |
| E. C. Walter, B. J. Murray, F. Favier, E. Menke, and R. M. Penner. Department of Chemistry, University of California, Irvine, CA 92697 |
| A general method is described for the electrodeposition of long (>500 m) nanowires composed of noble or coinage metals including nickel, copper, silver, and gold. Nanowires of these metals, with diameters ranging from 60 to 750 nm, were obtained by the selective electrodeposition of metal at the step edges of highly oriented pyrolytic graphite surfaces by applying three voltage pulses in succession: An oxidizing "activation" pulse, a large amplitude, reducing "nucleation" pulse, and a small amplitude reducing "growth" pulse. Also, long (> 100 µm) bimetallic nanowires, compositionally modulated along the axis of the nanowire, were prepared. Essentially, this method involves "wiring" together nanoparticles of one metal using nanowires of a second. Using this approach, beaded bimetallic nanowires that are up to a millimeter in length can be prepared in parallel arrays on a graphite surface. These wires can then be transferred onto a second, insulating surface (e.g., glass) using a method we have previously described. |
|
Surface Chemistry on Carbonaceous Materials
Division of Colloid and Surface Chemistry |