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(a–d) SEM images of the ordered Si/ZnO nanotrees: (a,b) top view, (c,d) 20o titled view, (e) SERS spectra of molecules of rhodamine 6G adsorbed from the solution with the concentration of 10−6 M collected from: (I) Si/ZnO nanotrees, (II) Ag nanoparticles substrate prepared by the sputtering method, (III) Si/ZnO nanotrees decorated by Ag nanoparticles. Reprinted with permission from [40]. Copyright 2010 American Chemical Society.
