Molecular-Level Engineering of Adhesion in Carbon Nanomaterial Interfaces

Michael R. Roenbeck, Al'ona Furmanchuk, Zhi An, Jeffrey T. Paci, Xiaoding Wei, SonBinh Nguyen*, George C Schatz, Horacio Dante Espinosa

*Corresponding author for this work

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

Weak interfilament van der Waals interactions are potentially a significant roadblock in the development of carbon nanotube- (CNT-) and graphene-based nanocomposites. Chemical functionalization is envisioned as a means of introducing stronger intermolecular interactions at nanoscale interfaces, which in turn could enhance composite strength. This paper reports measurements of the adhesive energy of CNT-graphite interfaces functionalized with various coverages of arylpropionic acid. Peeling experiments conducted in situ in a scanning electron microscope show significantly larger adhesive energies compared to previously obtained measurements for unfunctionalized surfaces (Roenbeck et al. ACS Nano 2014, 8 (1), 124-138). Surprisingly, however, the adhesive energies are significantly higher when both surfaces have intermediate coverages than when one surface is densely functionalized. Atomistic simulations reveal a novel functional group interdiffusion mechanism, which arises for intermediate coverages in the presence of water. This interdiffusion is not observed when one surface is densely functionalized, resulting in energy trends that correlate with those observed in experiments. This unique intermolecular interaction mechanism, revealed through the integrated experimental-computational approach presented here, provides significant insights for use in the development of next-generation nanocomposites.

Original languageEnglish (US)
Pages (from-to)4504-4516
Number of pages13
JournalNano letters
Volume15
Issue number7
DOIs
StatePublished - Jul 8 2015

Keywords

  • Carbon-based nanomaterials
  • adhesive energy
  • atomistic simulations
  • chemical functionalization
  • in situ SEM testing
  • surface energy

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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