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1.
Figure 6

Figure 6. From: Surface-Enhanced Raman Scattering: Comparison of Three Different Molecules on Single-Crystal Nanocubes and Nanospheres of Silver.

SERS spectra of (A) 1,4-benzenedithiol (1,4-BDT) and (B) 4-methyl benzenethiol (4-MBT) adsorbed on Ag nanocubes (black), Ag nanospheres (red), and the normal Raman spectra (dotted). These spectra have been normalized to compare band shapes and are averages of 5 spectra to show the consistency of peak morphology. Peak frequencies in cm−1 are shown for clarity.

Matthew Rycenga, et al. J Phys Chem A. ;113(16):3932-3939.
2.
Figure 1

Figure 1. From: Surface-Enhanced Raman Scattering: Comparison of Three Different Molecules on Single-Crystal Nanocubes and Nanospheres of Silver.

SEM images (A, C) and TEM images (B, D) of the Ag nanocubes and Ag nanospheres used for SERS measurements in this study. The nanocubes, shown in (A) and (B), had an average edge length of 38±8 nm. The nanospheres, shown in (C) and (D), had an average diameter of 35±7 nm. The scale bars correspond to 1 µm in (A, C) and 10 nm in (B, D).

Matthew Rycenga, et al. J Phys Chem A. ;113(16):3932-3939.
3.
Figure 2

Figure 2. From: Surface-Enhanced Raman Scattering: Comparison of Three Different Molecules on Single-Crystal Nanocubes and Nanospheres of Silver.

The calculated far-field extinction spectra (solid) and the experimentally measured extinction spectra (dashed) for Ag nanocubes 38 nm in edge length (A) and Ag nanospheres 35 nm in diameter (B). All spectra were calculated or measured for particles suspended in water. The main extinction peak was located at 440 nm for the nanocubes and 410 nm for the nanospheres.

Matthew Rycenga, et al. J Phys Chem A. ;113(16):3932-3939.
4.
Figure 3

Figure 3. From: Surface-Enhanced Raman Scattering: Comparison of Three Different Molecules on Single-Crystal Nanocubes and Nanospheres of Silver.

SERS spectra taken from nanocubes 38 nm in edge length (top trace) and nanospheres 35 nm in diameter (middle trace) and the normal Raman scattering spectra (bottom trace), for three different molecules: (A) 1,4-benzenedithiol (1,4-BDT), (B) 4-methyl benzenethiol (4-MBT), and (C) 1-pentanethiol (1-PT). The numbers above each spectrum represents the scale in adu mW−1 s−1. In (C), the peak at 1640 cm−1 is from water and is present because of the low Raman intensity of 1-PT on nanospheres.

Matthew Rycenga, et al. J Phys Chem A. ;113(16):3932-3939.
5.
Figure 5

Figure 5. From: Surface-Enhanced Raman Scattering: Comparison of Three Different Molecules on Single-Crystal Nanocubes and Nanospheres of Silver.

Electric field enhancement (|E|) contours for a Ag nanocube of 38 nm in edge length and a Ag nanosphere of 35 nm in diameter with an excitation wavelength of 514 nm and with water as the external dielectric medium. The cartoon at the bottom of each contour plot shows the plane of the nanoparticle represented by the calculated ∞E’ contour plot. For (A) the incident light is along the z-axis and the E-field along the [110] direction and for (B) the incident light along the z-axis and E-field along the x-axis. For the cube, the E-field enhancement is localized at the corners.

Matthew Rycenga, et al. J Phys Chem A. ;113(16):3932-3939.
6.
Figure 4

Figure 4. From: Surface-Enhanced Raman Scattering: Comparison of Three Different Molecules on Single-Crystal Nanocubes and Nanospheres of Silver.

Extinction-spectra and SERS spectra from Ag nanocubes with an average edge length of 46±6 nm: (A) The far-field extinction spectra for the Ag nanocubes (black line) and after functionalization with 1,4-BDT (red line), 4-MBT (green line) and 1-PT (blue line). All spectra were taken in water after sonication. The inset shows the TEM image of the Ag nanocubes where the scale bar is 50 nm. For these nanocubes the main extinction peak was located at 450 nm and was red-shifted ~15 nm after functionalization with the thiolate SAMs. (B) SERS spectra taken from nanocubes in (A) for three different molecules: 1,4-benzenedithiol (1,4-BDT, top trace), 4-methyl benzenethiol (4-MBT, middle trace), and (C) 1-pentanethiol (1-PT, bottom trace). The numbers above each spectrum represents the scale in adu mW−1 s−1.

Matthew Rycenga, et al. J Phys Chem A. ;113(16):3932-3939.

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