The MIR ATR-IR spectra were collected using a Perkin Elmer Spectrum 100 ATR-IR spectrometer (Perkin Elmer, Waltham, MA, USA). There were eight scans per sample from three positions, with a resolution of 0.5 cm−1 and a wavenumber range of 4000 to 650 cm−1. The measurement was conducted at a temperature of 22 °C under controlled humidity levels.
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