Abstract
Ultrafast transient absorption spectroscopy has been used to characterize coherent acoustic oscillations for a series of nanorods composed of a variety of metals. The nanorods are produced by electrochemical synthesis in polycarbonate templates with several pore diameters of 25). The measurements extend our previous studies on Au, Ni, and Pd (Sando, G. M.; et al. J. Chem. Phys. 2007, 127, 074705) as well as Al nanorods (Pomfret, M. B.; et al. Chem. Mater. 2008, 20, 5945) to include those composed of Ag, Cu, Pt, Fe, Rh, and Co. The acoustic breathing mode periods measured are consistent with those predicted based on classical elastic theory using the bulk speeds of sound. The phase and damping of the oscillations are discussed in terms of the nanorod structures and excitation mechanisms.
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