Surface functional group investigation of oxidized, nanodiamond-derived carbon nano-onions

Mahendra K. Sreeramoju, John P. Selegue, Ramakrishna Podila, Apparao M. Rao

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Soluble, oxidized, nanodiamond-derived carbon nano-onions (ON-CNOs) were synthesized by treatment of nanodiamond-derived carbon nano-onions (N-CNOs) with a mixture of fuming sulfuric acid (20 % SO3 in H2SO4, oleum) and conc. nitric acid. ON-CNOs dissolve in polar organic solvents and water due to the presence of acidic functional groups on both the nano-onion surface and adsorbed polycyclic aromatic adsorbents, also called carboxylated carbonaceous fragments (CCFs). The CCFs were removed by either base treatment or thermal desorption and characterized by matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS). The structure and distribution of functional groups on ON-CNOs before and after CCF removal were studied by thermogravimetric analysis, transmission electron microscopy, pH-titrimetry, Raman spectroscopy and Fourier-transform infrared spectroscopy (FT-IR).

Original languageEnglish
Article number101966
JournalMaterials Today Communications
StatePublished - Mar 2021

Bibliographical note

Funding Information:
We are grateful to the National Science Foundation (Center for Advanced Materials , Grant EPS-0814194 ), National Institute for Hometown Security ( HSHQDC-07-3-00005 ) and the University of Kentucky for financial support.

Publisher Copyright:
© 2020 Elsevier Ltd


  • Carbon nano-onions
  • Characterization
  • Functionalization
  • Nanodiamonds
  • Oxidized carbon nanomaterials
  • Polycyclic aromatic hydrocarbons
  • Raman analysis
  • Surface adsorbents
  • Thermal desorption
  • pH-metric titration

ASJC Scopus subject areas

  • Materials Science (all)
  • Mechanics of Materials
  • Materials Chemistry


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