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. 2020 Dec 31;11(1):75. doi: 10.3390/nano11010075

Figure 9.

Figure 9

(a–c) SEM images of ZnO/Au nanoneedle arrays prepared at different HAuCl4 concentrations: (a) 0.1, (b) 0.3 and (c) 0.5 mM. Inset shows corresponding high magnification SEM images. (d–f) TEM images of ZnO/Au nanoneedles prepared at different HAuCl4 concentrations: (d) 0.1, (e) 0.3 and (f) 0.5 mM. (g) SERS spectra of molecules of rhodamine 6G adsorbed on: (I) ZnO (II), (III) and (IV) ZnO/Au produced using HAuCl4 at various concentrations: 0.1, 0.3 and 0.5 mM, respectively. Reprinted with permission from [42]. Copyright 2009 American Chemical Society.