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Extinction spectra of bare gold NPs with different sizes from 10 to 45 nm (full lines). The resonance band of the cyanine dye centered at 586 nm corresponds to the aggregate band while the blueshift and broad band correspond to that of the monomer (dotted line).
(a) Citrate ions molecules, (b) TDBC molecules, and (c) TEM images of resulting NPs of different sizes coated with TDBC molecules.
TEM images and elemental mapping obtains from EELS measurements. (a) TEM image of Au@TDBC deposited on a holey carbon grid, (b) S-mapping of the same area, and (c) corresponding C-mapping.
Extinction spectra of Au NPs with different sizes coated with TDBC. The spectra are arbitrary translated for the clarity of the figure.
Plasmon resonance position vs NP size.
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