The FT-IR spectra of CMSr films with different NaOH concentrations were recorded at room temperature using a Nicolet 6700 FT-IR spectrometer (Thermo Electron Corporation, Waltham, MA, USA) in the range of 4000–400 cm−1 with 64 scans. The DTGS KBr detector and KBr beam splitter were used to investigate the functional groups of the CMSr film [55 (link)].
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