Changes in composition of various NPs were recorded on a Nicolet 6700 infrared detector (Thermo Fisher Scientific, USA). SPIONs, SPION@Cs, SPION@Cs-PEG-FA and SPION@Cs-PEG-FA were pressed with KBr to obtain the pellets at a pressure of 300 kg/cm2. The FTIR spectra of the above sample were obtained by averaging 32 interferograms within the range of 1000–4000 cm–1 with a resolution of 2 cm–1.
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