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27 August 2005Synthesis of gold nano-wire and nano-dumbbell shaped colloids and AuC60 nano-clusters
A technique for the fabrication of colloidal gold nano-wire and nano-dumbbell shaped particles using carbon nanotubes and rod shaped viruses as templates is described. The gold (Au) encapsulation process was accomplished by the precipitation of gold chloride from aqueous solutions. When this process was conducted in the presence of hydroxylated C60, small pieces of phase-separated composites of AuC60 appeared to have formed. These nano-clusters may turn out to be large noble metal analogs of the alkali metal fullerides with the smallest geometrically possible Au aggregate consisting of 55 gold atoms. The existence of noble metal fullerene composites has been previously theorized. The alkali metal fullerides are examples of phase separated solids and have exhibited superconductivity with temperatures as high 33K. The mechanism required for the binding energy between C60 and gold has been observed to exist between C60 and many of the mirror metals (Al, Ag, Au, Cu, Ni). This binding energy is a charge transfer from the metal Fermi level into the C60 LUMO. If this bonding energy, is greater than the metals coagulation energy an Au/C60 size terminated mechanism during the formation of the gold aggregates by the adhesion of C60 to the surface is energetically favorable.
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Preston B. Landon, Brandon C. Jarvis, Cody L. Gilleland, Tim Renfro, Jose Gutierrez, Jennifer Synowczynski, Samuel G. Hirsch, Robert Glosser, "Synthesis of gold nano-wire and nano-dumbbell shaped colloids and AuC60 nano-clusters," Proc. SPIE 5931, Nanoengineering: Fabrication, Properties, Optics, and Devices II, 59311C (27 August 2005);