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(a–d) SEM images of TiO2 inverse opal substrates calcined in various temperatures: (a) 225, (b) 260, (c) 295, (d) 350 °C. (e) Reflection spectra of TiO2 inverse opal substrates. (f) SERS spectra of methylene blue adsorbed from 10−5 M aqueous solution on various inverse opal substrates. Reprinted with permission from [53]. Copyright 2014 American Chemical Society.
