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. 2017 Sep 14;2(9):5759–5765. doi: 10.1021/acsomega.7b00798

Figure 2.

Figure 2

Photoluminescence spectrum of the foamed gold with micro/nanoscale hollow spheres for different excitation wavelengths. The sample density ρ and the diameter of the Au sphere d are as indicated. The results are shown over the excitation wavelength regime from 280 to 478 nm (a) and from 478 to 520 nm (b).