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SEM images of GaN nanowalls covered with silver: less densely packed (S1) and more densely packed (S2). (a,d) Without annealing, (b,e) after annealing at 200 °C, (c,f) after annealing at 500 °C. (g) SERS spectra for substrates S1 and S2. Thiophenol was used as a test molecule. Reprinted with permission from [38]. Copyright 2015 Royal Society of Chemistry.
