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Surface enhanced Raman spectroscopy (SERS) combined with theoretical calculations was widely used to study the interaction of molecules with the noble metal nanoparticles[1-3].Benzoic acid (BA) and phthalic acid (PTA) are the simplest aromatic carboxylic acids, and they can be regarded as typical model compounds in investigating the interaction of aromatic carboxylic acids with metal surfaces by use of SERS spectroscopy.