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Infrared spectra and SERS spectra of CDFe and CDHM. (A) Infrared spectrum of CDFe. (B) Infrared spectrum of CDHM. (C) SERS spectrum: 8.0 × 10−5 mol/L AgNPs + CDFe (0, 16, 32, 48, 60, 96, and 128 mg/L). (D) SERS spectrum: 8.0 × 10−5 mol/L AgNPs + CDHM (0, 32, 48, 64, 96, 128, and 160 mg/L).
