Pyrolysis mass-spectrometry study of detonation nanodiamonds surface chemistry

Abstract

Surface thermochemistry of detonation nanodiamonds (DND) is investigated by time-of-flight electron ionization mass-spectrometry. FTIR spectroscopy analysis supports mass-spectrometry results. The impact of ambient air atmosphere as part of DND deagglomeration process is revealed. It is stated that the surface of DND agglomerates is covered with esters, lactones, nitro-groups and aliphatic hydrocarbons. DND deagglomerated via annealing under air are terminated by carboxyl groups and carboxylic anhydrides. Carboxyl groups are revealed to be transformed to lactones during pyrolysis.

Keywords:

• Detonation nanodiamonds
• pyrolysis mass-spectrometry
• temperature programmed desorption mass spectrometry
• surface chemical modification

Acknowledgements

1. The research was supported in the frame of Ioffe Institute project 0040-2019-0013.

2. Authors are grateful to A.Vul for fruitful discussions. E. Yudina kindly thanks I. Atamanov for technical support in samples preparation.