Diamagnetism of carbon onions probed by NMR of adsorbed water

A. M. Panich, V. Yu Osipov, K. Takai

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We measured the 1H chemical shift of water molecules adsorbed on defect sites of carbon onions and compared it with the shifts of bulk water and water adsorbed by chemically-derived graphene, graphene oxide and nanodiamond. The positions of 1H resonances for insulator nanodiamond and graphene oxide are close to that of bulk water, while water molecules adsorbed by graphene, and particularly by carbon onions, reveal a significant deviation in chemical shift from that of bulk water, which can be attributed to the diamagnetic screening effect of the conducting graphene layers. This conclusion is supported by a pronounced correlation established in our experiments between the proton chemical shifts and diamagnetic contribution to the magnetic susceptibility.

Original languageEnglish
Pages (from-to)392-397
Number of pages6
JournalXinxing Tan Cailiao/New Carbon Materials
Volume29
Issue number5
DOIs
StatePublished - 1 Oct 2014

Keywords

  • Carbon onions
  • Diamagnetism
  • Graphene
  • Nuclear magnetic resonance

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