Chemists perfect fast way to synthesize libraries of gold nanoparticles

09/02/05

University of Oregon work appears on cover of Inorganic Chemistry



Vol. 44, Issue 18
September 5, 2005 Cover
Ligand exchange reactions of phosphine-stabilized undecagold clusters with thiol-containing ligands yield a diverse library of functionalized undecagold clusters, such as the five shown in the cover figure. This study describes 22 functionalized clusters, the mechanism of the ligand exchange, and the optical properties of this family of clusters.
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EUGENE -- Not all libraries contain books. In chemistry, the word library is used to refer to a collection of molecules. University of Oregon chemist Jim Hutchison's new way of rapidly generating libraries of tiny particles with great promise for research and development at the nanoscale is featured on the cover of the Sept. 5 issue of Inorganic Chemistry.

"We've discovered a method for generating a diverse library of functionalized gold particles quickly and easily," said Hutchison, who directs the university's Materials Science Institute. "Basic research of this type is the key to finding out what kinds of new electronic, optical and pharmaceutical products actually will come to market."

The article describes how to synthesize the versatile particles, built with cores of 11 gold atoms, and discloses their properties. Nanomaterials and technologies are projected to become a trillion dollar industry by 2010 and affect every industrial and consumer product sector, Hutchison said.



Jim Hutchison, University of Oregon
Photo credit: Jack Liu
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One of the keys to understanding the size-dependent properties and applications of nanoparticles is generating libraries of particles with different sizes for physical study. Earlier this year, Hutchison's laboratory reported success in generating a similar library of larger particles, with cores having about 100 gold atoms, in the Journal of the American Chemical Society. The 11-atom and 100-atom libraries span a size range of 0.8 to 1.5 nanometers, a range of particular interest to nanoscientists and technologists.

Hutchison co-authored the Inorganic Chemistry article with Gerd Woehrle, one of his doctoral students. Woehrle is now finishing post-doctoral work at the Max Planck Institute in Germany.

Already known as world leaders for encouraging the teaching of green chemistry principles, Hutchison and his Oregon colleagues are pioneering the field of green nanoscience. His role in laying out the conceptual template for how to design "green" or environmentally-benign nanosubstances was described in the March issue of Environmental Science & Technology.

Hutchison is a member of ONAMI, the Oregon Nanoscience and Microtechnologies Institute. The National Science Foundation, the Alfred P. Sloan Foundation and the Camille and Henry Dreyfus Foundation, Inc., have funded his research.

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