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(a) UV-visible absorbance spectra of GNSs and four different types of GNRs with the LSPR peaks at 520, 607, 650, 710, and 750 nm. The emission spectrum of the QDs with the peak wavelength of 605 nm is shown as the dashed curve. TEM image of (b) the GNSs and (c) 750 nm GNRs.
Emission intensities for QDs (top of the dashed histogram), QD-composites with gold nanoparticles of same charges (emission reduction due to the inner filter effect) (top of the solid histogram), and QD-composites with gold nanoparticles of oppositely charges (emission reduction due to both the inner filter effect and the FRET/SET quenching process) (hatched histogram). The values of different correction factors (for inner filter effects) and different quenching efficiencies are shown in the histograms for GNSs and the GNRs with LSPR peaks of 520, 607, 650, 710, and 750 nm.
Quenching efficiency as a function of the separation distance between a QD and a GNR. Filled squares: quenching efficiencies of QDs conjugated to GNRs, PDDAC-PSS-GNRs, and with the error bars in repeated measurements. As the schematic diagram at the bottom of this figure shows, CTAB (cetyltrimethylammonium bromide) and PEG (polyethylene glycol) are the initial surrounding materials on the synthesized GNRs and QDs, respectively, and their thicknesses should be counted in the separation distance. TEM images for QDs conjugated to (a) GNRs, (b) PDDAC-PSS-GNRs, and (c) .
Schematic diagram for the conjugation of GNRs with ssDNA and the hybridization process of ssDNA-GNRs with ssDNA-QDs. (a) Emission spectra of ssDNA-QDs (red curve), ssDNA-QDs mixed with complementary ssDNA-GNRs after the hybridization [black solid curve, corresponding to TEM image (b)], and with noncomplementary ssDNA-GNRs [dashed curve, corresponding to TEM image (c)].
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