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a–c) SERS maps made by tracking the band at 1076 cm−1 at three randomly selected areas of AuNP/BC-1.2 after exposing to 1 mM 4-MBA solution; d–f) SERS maps made by tracking the band at 1076 cm−1 at three randomly selected areas of AgNP/BC-250 after exposing to 1 mM 4-MBA solution.
