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Surface Plasmon Dynamics of High-Aspect-Ratio Gold Nanorods

Content Provider	Springer Nature Link
Author	Sando, Gerald M. Berry, Alan D. Campbell, Paul M. Baronavski, Andrew P. Owrutsky, Jeffrey C.
Copyright Year	2007
Abstract	Ultrafast transient absorption studies are reported for high-aspect-ratio gold nanorods that were fabricated by electrochemical deposition in polycarbonate templates. The nanorods are 60 nm in diameter with distribution of lengths of up to 6 μm. The average aspect ratio was ∼50, resulting in a longitudinal surface plasmon resonance (SPR$_{L}$) band in the mid-IR, as well as a transverse (SPR$_{T}$) band in the visible. The rods were excited at 400 nm and probed at a range of wavelengths from the visible to the mid-IR to interrogate both SPR bands. The dynamics observed, including the electron–phonon coupling time and coherent acoustic breathing mode oscillations, closely resemble those previously reported for gold spherical nanoparticles and smaller-aspect-ratio nanorods. The electron–phonon coupling time was similarly determined to be 3.3 ± 0.2 ps for both of the SPR bands. Also, oscillations with a 32-ps period were observed for probing near the SPR$_{T}$ band in the visible region due to impulsive coherent excitation of the acoustic breathing mode, which are consistent with the 60-nm diameter of the nanorods determined by scanning electron microscopy. The results demonstrate that the dynamics for long gold nanorods are similar to those for smaller nanoparticles.
Starting Page	23
Ending Page	29
Page Count	7
File Format	PDF
ISSN	15571955
Journal	Plasmonics
Volume Number	2
Issue Number	1
e-ISSN	15571963
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2007-02-02
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ultrafast transient absorption High-aspect-ratio gold nanorod Electrochemical deposition Surface plasmon resonance Biochemistry Biophysics/Biomedical Physics Nanotechnology Biotechnology
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Biochemistry Biophysics Biotechnology

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