FTIR spectroscopy of nanodiamonds: Methods and interpretation

Fourier transform infrared spectroscopy (FTIR) is highly sensitive to the surface chemistry of nanodiamonds. In this review, we discuss the different FTIR methods available to characterize nanodiamonds and highlight their advantages and limitations. We also summarize the possible assignments of FTIR spectra of nanodiamonds reported in the literature and discuss FTIR spectra of nanodiamonds modified by different surface treatments. Current work of FTIR applied to in situ and operando characterization of nanodiamonds, in particular nanodiamonds exposed to water or characterized during electrochemical and photocatalytic processes, are also discussed. Finally, perspectives regarding possible future FTIR development for nanodiamonds characterization are proposed. [Display omitted] •FTIR can be applied to nanodiamonds in various environments due to versatile experimental schemes.•Main FTIR assignments and reference spectra of nanodiamonds are reviewed.•FTIR signatures of nanodiamonds highly depends on nanodiamonds type, environment and detection method.•Recent FTIR developments, which have not been applied to nanodiamonds yet, are highlighted for future research possibilities.