Figure 3 | Scientific Reports

Figure 3

From: Silver Nanorods Wrapped with Ultrathin Al2O3 Layers Exhibiting Excellent SERS Sensitivity and Outstanding SERS Stability

Figure 3

SEM images of (a) uncoated Ag nanorods before/after annealing at 200, 300 and 400 °C; and (b) Ag nanorods coated with Al2O3 layers by 1 and 2 ALD cycles before/after annealing at 300 and 400 °C, respectively. Reflectance spectra of (c) uncoated Ag nanorods; and (d) Ag nanorods coated with an Al2O3 layer by 2 ALD cycles before/after annealing at 200, 300 and 400 °C, respectively.

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