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SERS measurements. The red, green and blue lines show SERS spectra of MBA deposited on, respectively, 3, 6, and 15 nm of Au deposited on TiO2 surfaces at 8 Pa (a) and 12 Pa (b). The corresponding brighter color means that there was no annealing of the TiO2. Grey line: Raman spectrum of MBA powder (the intensity has been scaled down to be comparable with the SERS spectra). Black line: spectrum of MBA deposited on a TiO2 surface without Au, yielding no SERS signal.
