Fig. 5: SERS analysis of gas molecules through close-packed and tip-to-tip octahedral supercrystals. | Nature Communications

Fig. 5: SERS analysis of gas molecules through close-packed and tip-to-tip octahedral supercrystals.

From: Ensemble hot-spots in 3D supercrystals of plasmonic octahedral nanoparticles in tip-to-tip configured superlattices

Fig. 5

Surface charge distribution and electromagnetic field distributions of (a, b) close-packed (7 × 3) and (c, d) tip-to-tip (9 × 3) assembly of octahedral building blocks with 3 nm Ag layers under a 785 nm excitation (scale bar = 100 nm). Microscopic images and zoomed-in SEM images of (e) close-packed and (f) tip-to-tip octahedral supercrystals with existence of thin Ag layers. Corresponding SERS measurements of 1000 ppm CEPS gas molecules plotted for different laser powers (0.01, 0.5, 4, 11, and 21 mW) for (g) close-packed and (h) tip-to-tip octahedral supercrystals. Source data are provided as a Source Data file.

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