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Calibration of Dynamic Molecular Rulers Based on Plasmon Coupling between Gold Nanoparticles, Nano Letters. 5, 2246

Physics Department, Biophysics Graduate Program, and Chemistry Department, University of California, Berkeley, California 94720, USA.
Nano Letters (Impact Factor: 13.59). 12/2005; 5(11):2246-52. DOI: 10.1021/nl051592s
Source: PubMed

ABSTRACT Pairs of noble metal nanoparticles can be used to measure distances via the distance dependence of their plasmon coupling. These "plasmon rulers" offer exceptional photostability and brightness; however, the advantages and limitations of this approach remain to be explored. Here we report detailed plasmon peak versus separation calibration curves for 42- and 87-nm-diameter particle pairs, determine their measurement errors, and describe experimental procedures to improve their performance in biology, nanotechnology, and materials sciences.

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    • "Especially surface plasmon (SP) mode of light at metal surfaces can assist interaction of light with subwavelength metallic structures beyond the diffraction limit [1]. Near-field resonances of SPs in metallic structures often demonstrate characteristic spectral responses [2]–[4] that can be used in designing filtering elements [5], [6] or labeled as footprints for sensing applications [7], [8]. "
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    • "The average diameters are about 22.6 nm for Au300 with the particle size distribution from 2.8 nm to 69.4 nm, and 26.1 nm for Au600 with the particle size distribution from 2.9 nm to 74.8 nm, respectively. The absorption peak of plasmon mode of gold NPs (Au20) on the ITO substrate (Fig. 2f) is similar to that of gold NPs in an aqueous environment (centered at about 525 nm) [41] [42], but with a redshift by about 14 nm due to the increase in refractive index of environment (from water to ITO-coated glass) and plasmon coupling between gold NPs [43]. The longer tails of the absorption peaks for Au100 and Au300 suggest a significant getting closer and aggregated gold NPs with each other [36]. "
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    ABSTRACT: tA simple method for creating three-dimensional porous wurtzite CdSe films incorporated with plasmonicgold by the electrochemical layer-by-layer assembly was proposed. A prominent enhancement in lightabsorption of CdSe films was attained by the efficient light scattering of gold plasmons as sub-wavelengthantennas and concentrators and the near-field coupling of gold plasmons with the neighboring porousCdSe films. The broadband photocurrent enhancement of Au–CdSe composite systems in the visible lightrange and the local current maximum between 600 and 700 nm suggested the cooperative action ofantenna effects and electromagnetic field enhancement resulting from localized surface plasmon exci-tation of gold. Furthermore, the photoelectrochemical response of porous Au–CdSe composite films washighly tunable with respect to the number of Au–CdSe bilayer. The optimal short-circuit current andopen-circuit potential were obtained in a four-layer Au–CdSe system because the thicker absorber layerwith less porous structure might limit the electrolyte diffusion into the hybrid electrode and impose abarrier for electron tunneling and transferring. The highly versatile and tunable properties of assembledporous Au–CdSe composite films demonstrated their potential application in energy conversion devices.© 2013 Elsevier Ltd. All rights
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    • "Moreover, the coupling between two nanoparticles in close proximity produces an alteration of the plasmon spectra. This alteration has been used as a nanometric ruler to determine the distance between them [19] [20]. In a previous work, [4] we theoretically showed that the coupling between two nanoparticles is highly sensitive to the polarization of the external field. "
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