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Baseline-corrected absorbance and attenuated total reflectance: (A) infrared spectra of the pristine carboxylated nanodiamonds (pNDs), reoxidized nanodiamonds (rNDs), lysine-functionalized nanodiamonds (fNDs), and compound 1 [N′-(Nα,Nε-bis-Boc-lysyl),N″-(Fmoc)-diaminopropane]; (B) second derivatives of all spectra.
Notes: A total of 512 individual interferograms were collected and averaged for each sample. The featureless region between wave numbers of 2700 and 1900 cm−1 is not shown.
