Figure 9.
Representative SEM micrographs of nanoporous gold with various nanopore sizes. (a) Nanoporous gold film after 5 min dealloying at room temperature; (b) dealloyed at room temperature for 48 h; (c) thoroughly rinsed nanoporous gold annealed at 200 °C for 2 h; (d) 400 °C for 2 h; (e) 500 °C for 2 h; and (f) 600 °C for 2 h. SERS spectra of nanoporous gold with different pore sizes for (g) 10−7 mol/L R6G aqueous solution and (h) 10−5 mol/L crystal violet (CV) methanol solution. Reproduced with permission from [96]. Copyright American Institute of Physics, 2007.