Arrangement and dynamics of diamine, etheric, and tetraalkylammonium intercalates within graphene or graphite oxide galleries by 2h nmr

Kazuma Gotoh, Chika Sugimoto, Ryohei Morita, Tatsuya Miyatou, Motohiro Mizuno, Weekit Sirisaksoontorn, Michael M. Lerner, Hiroyuki Ishida

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Ternary graphite intercalation compounds (GICs), which consist of graphite, alkali metal (Li, Na, K) cations, and organic cointercalates such as ethylenediamine (en) or tetrahydrofuran (thf), are useful precursors to graphene-based materials and tetraalkylammonium GICs. This study investigates the gallery arrangements and intercalate dynamics of the deuterated en(d4), thf(d8), piperazine(d10), or 1,4-diazabicyclo[2.2.2]octane(dabco)(d12) in ternary GICs containing Na+ or K+ cations using XRD and solid state 23Na and 2H NMR line-shape analyses. An en(d4)-graphite oxide (GO) intercalation compound and the trihexylmethyl(d3)-ammonium (thma) GIC were also prepared and evaluated by XRD and NMR. The 2H NMR spectra exhibit a narrow peak ascribed to intercalates undergoing isotropic rotation and a broad powder pattern ascribed to intercalates in a rigid state or undergoing uniaxial rotations. The thma intercalates in thma(d3)-GIC and the en(d4) intercalates in en(d4)-GO are relatively mobile and can diffuse; this may arise because there are no alkali metal cations in the galleries. The molecular dynamics as well as the synthetic challenges presented by some GICs are explained in terms of different affinities of alkali metal cations to the cointercalates.

Original languageEnglish
Pages (from-to)11763-11770
Number of pages8
JournalJournal of Physical Chemistry C
Volume119
Issue number21
DOIs
Publication statusPublished - May 28 2015

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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