Salicylic acid, oxalic acid, CC pyrocatechol, dopamine, PTCDA, CV, and CuPc were chosen as different signal molecules. Certain amounts of molecules were dissolved in DI water (for PTCDA, in 0.1 M NaOH solution) to form a uniform solution with 10 mM, and then, 1 ml of this solution was mixed with 5 ml of a solution containing Raman substrate (MGT). The mixture was stirred for an hour. The resulting solution was centrifuged and dispersed in 2 ml of DI water. The final solution was dropped onto the Si/SiO2 substrate and dried at room temperature. Last, a 633-nm laser was used to detect each sample by Raman spectroscopy. The exposure time was 0.5 s, and laser energy was 5 mW.

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