Diamagnetism of carbon onions probed by NMR of adsorbed water

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

doi:10.1016/S1872-5805(14)60145-1

Diamagnetism of carbon onions probed by NMR of adsorbed water

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

7 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 language	English
Pages (from-to)	392-397
Number of pages	6
Journal	Xinxing Tan Cailiao/New Carbon Materials
Volume	29
Issue number	5
DOIs	https://doi.org/10.1016/S1872-5805(14)60145-1
State	Published - 1 Oct 2014

Keywords

Carbon onions
Diamagnetism
Graphene
Nuclear magnetic resonance

ASJC Scopus subject areas

General Materials Science

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10.1016/S1872-5805(14)60145-1

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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.",

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T1 - Diamagnetism of carbon onions probed by NMR of adsorbed water

AU - Panich, A. M.

AU - Osipov, V. Yu

AU - Takai, K.

PY - 2014/10/1

Y1 - 2014/10/1

N2 - 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.

AB - 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.

KW - Carbon onions

KW - Diamagnetism

KW - Graphene

KW - Nuclear magnetic resonance

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M3 - Article

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SN - 1007-8827

VL - 29

SP - 392

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JO - Xinxing Tan Cailiao/New Carbon Materials

JF - Xinxing Tan Cailiao/New Carbon Materials

IS - 5

ER -

Diamagnetism of carbon onions probed by NMR of adsorbed water

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