Results: 5

1.
Figure 1

Figure 1. From: Measuring the SERS Enhancement Factors of Dimers with Different Structures Constructed from Silver Nanocubes.

SEM image of the Ag nanocubes employed in our SERS measurements. Their average edge length was 100.7±5.7 nm, respectively. The scale bars in the inset correspond to 100 nm.

Pedro H. C. Camargo, et al. Chem Phys Lett. ;484(4-6):304-308.
2.
Figure 4

Figure 4. From: Measuring the SERS Enhancement Factors of Dimers with Different Structures Constructed from Silver Nanocubes.

Schematic illustrations (top view) of the dimers probed in Figure 3. The red color marks the hot-spot region for each dimer. In these dimers, the hot-spot region can be described by the narrow gap between: two nearly touching side faces, an edge and a side face, and two nearly touching edges (face-to-face, edge-to-face, and edge-to-edge configurations, respectively). Nhot-spot refers to the number of 4-MBT molecules in the hot-spot region, while Nsers refers to the total number of molecules adsorbed on the entire surface of the dimer.

Pedro H. C. Camargo, et al. Chem Phys Lett. ;484(4-6):304-308.
3.
Figure 5

Figure 5. From: Measuring the SERS Enhancement Factors of Dimers with Different Structures Constructed from Silver Nanocubes.

Summary of the enhancement factors calculated for a single Ag nanocube, and the dimers of nanocubes probed in Figure 3. The highest EFdimer values were obtained when the laser was polarized parallel to the dimer’s longitudinal axis. While the EFdimer for the face-to-face and edge-to-face configuration were comparable, they corresponded to an increase of 27 and 9 folds with respect to EFcube, respectively. For the edge-to-face configuration, EFdimer was within the same order of magnitude as EFcube. When the laser was polarized perpendicular to the dimer’s longitudinal axis, the highest EFdimer was obtained for the edge-to-edge configuration. However, the EFdimer was comparable to EFcube for all dimer structures.

Pedro H. C. Camargo, et al. Chem Phys Lett. ;484(4-6):304-308.
4.
Figure 2

Figure 2. From: Measuring the SERS Enhancement Factors of Dimers with Different Structures Constructed from Silver Nanocubes.

(A) SERS spectra recorded from aqueous suspensions of the Ag nanocubes that had been functionalized with 4-MBT. EFcube calculated from the solution-phase spectra was 2.1×106. (B) SERS spectra from a single Ag nanocube deposited over a Si substrate. The sample was functionalized with 4-MBT and the arrows indicate the laser polarization direction relative to the nanocube. Here, the SERS signals were more strongly enhanced when the laser was polarized along a face diagonal (bottom trace). The inset shows an SEM image of the probed Ag nanocube. The scale bar in the inset corresponds to 100 nm.

Pedro H. C. Camargo, et al. Chem Phys Lett. ;484(4-6):304-308.
5.
Figure 3

Figure 3. From: Measuring the SERS Enhancement Factors of Dimers with Different Structures Constructed from Silver Nanocubes.

(A, B) SERS spectra for dimers consisting of two sharp Ag nanocubes displaying a variety of well-defined structures: face-to-face (top trace), edge-to-face (middle trace), or edge-to-edge (bottom trace). The samples were functionalized with 4-MBT. The insets display SEM images of the probed dimers. The scale bars applies to all insets and correspond to 100 nm. The double arrows indicate the laser polarization direction in (A) and (B). In (A), the laser was polarized along the longitudinal axis of each dimer. Conversely, the laser was polarized perpendicular to the longitudinal axis of each dimer in (B).

Pedro H. C. Camargo, et al. Chem Phys Lett. ;484(4-6):304-308.

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