The setup of the home-built confocal spectroscopic system.
The SEM images of GNPs prepared with the addition of different amounts of NaCl solution: (a) 0 μl (GM), (b) 50 μl (GMDT), (c) 100 μl and (d) 200 μl. The dimers and trimers are highlighted by yellow and green circles. Inset: the TEM image of the gap.
The absorption spectra of the (a) GM and (b) GMDT. Insets: The SEM images of GM, GD, and GT.
SEF spectra excited with 532 nm from (a) Rh6G, (b) GM, and (c) GMDT.
SERS spectra excited with 632.8 nm from (a) Rh6G, (b) GM, and (c) GMDT.
Images of the simulated distributions of |E|2 were plotted in logarithmic scale with (a)-(c) 532 and (d)-(f) 632.8 nm excitation for GM, GD, and GT.
Surface average of |E|2 with 0, 1, and 2 nm distance from the surfaces of GM, GD, and GT. Inset: Three integrated enveloping surfaces of GD.
The enhancement factor of SEF and SERS excited at 532 and 632.8 nm from GM, GD, GT, and GMDT.
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