Plasmon resonances in Au-Ag nanoboxes studied by single nanoparticle spectroscopy

PHYS 533

Min Hu, mhu2@u.washington.edu1, Gregory V. Hartland2, Jingyi Chen, chenj@bnl.gov3, Zhi-Yuan Li4, Younan Xia1, Xingde Li5, and Manuel Marquez6. (1) Department of Chemistry, University of Washington, Seattle, Seattle, WA 98195, (2) Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, IN 46556, (3) Department of Condense Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, NY 11973, (4) Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing, 100080, China, (5) Department of Bioengineering, University of Washington, Seattle, WA 98195, (6) INEST Group, Research Center, Philip Morris USA, Inc, Richmond, VA 23234
The plasmon resonances of two Au-Ag nanobox samples with an average edge length of 44 nm and 58 nm and wall thickness of 6 nm and 8 nm, respectively, have been studied by single particle spectroscopy. The resonances observed in the spectra occur in the 1.55 eV to 1.75 eV energy range. The measurements gave an average linewidth of 306 meV for the 44 nm boxes, and 350 meV for the 58 nm boxes. These linewidths are much broader than those of gold nanorods with comparable resonance energies. This unusual broadening is attributed to a combination of increased surface scattering of electrons, as well as increased radiation damping for the nanoboxes. DDA calculations have been performed with and without surface scattering of electrons to compare with the experimental scattering spectra. The calculations confirm that both surface scattering of electrons and radiation damping are important effects in this system.

Poster Session
7:30 PM-10:00 PM, Wednesday, 13 September 2006 Moscone Center -- Hall D, Poster

8:00 PM-10:00 PM, Monday, 11 September 2006 Moscone Center -- Hall D, Sci-Mix

Division of Physical Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006