Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 114, Issue 25, Pages 11127-11132Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp1040663
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Funding
- National Science Foundation's Nanoscale Science and Engineering Initiative [EEC-647452]
- Welch Foundation [C-1556]
- NSF [DG0504425]
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Dark field microspectroscopy is a powerful tool for studying plasmon resonances of noble metal nanoparticles and for developing their applications in sensing and imaging. Here we calibrate a dark field microspectrometer with measurements on gold nanospheres in a uniform dielectric medium to yield quantitative spectral scattering cross sections for elongated nanoparticle shapes. Gold bipyramids, 135 nm in length, were found to have a peak differential cross section of 1.2 x 10(-16) m(2). Measurements of a small ensemble of gold nanorods, 13 nm in diameter and 45 nm in length on average, were found to have a peak differential cross section of only 1 x 10(-18) m(2). For the smaller gold nanorods, approximate expressions for the total scattering cross section may be used to indicate their scattering signal in microscopy applications.
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