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(a) Raman spectrum of E2 (black), SERS spectra of the empty sensor (Apt+MCH) and increasing concentrations of E2 on TiO2/Au 6 nm (annealed). The molecular structure of E2 is presented at the top. (b) Intensity of the peak at 743 cm−1 for increasing concentrations of E2. The hatched rectangle represents the intensity of the empty sensor and its uncertainty.
