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TEM images of GNR solutions prepared by (a) two and (b) three times substitution of CTAB with a Milli-Q water. [(c) and (d)] Related SEM images of self-assembled GNRs on the glass substrates prepared using concentrated solution of (a) and (b), respectively.
Schematic representations of GNR assembly processes using GNR solutions prepared by (a) two and (b) three times substitution of CTAB with a Milli-Q water. Bilayer of CTAB molecule is terminated with the quaternary amines and positively charged.
Optical absorption spectra of samples shown in Figs. 1(c) and 1(d) (named parallel- and linear-aligned GNRs, respectively). The concentrations of GNRs on both samples are almost same (about ). The spectra include both absorption and scattering by GNRs.
SERS spectra of R6G adsorbed on samples shown in Figs. 1(c) and 1(d). Both samples have the accurate concentrations of GNRs and R6G in the detection areas: laser wavelength of ; laser power of ; excitation spot size of ; integration number of 254; spectral resolution of . The samples are positioned perpendicular with respect to the excitation source.
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