Special Section on Nanocarbon Photonics and Optoelectronics

Antiferromagnetic transition in graphene functionalized with nitroaniline

[+] Author Affiliations
Anton A. Komlev

Lappeenranta University of Technology, Lappeenranta, Finland

Saint Petersburg State Electrotechnical University, Saint Petersburg, Russia

Tatiana L. Makarova

Lappeenranta University of Technology, Lappeenranta, Finland

Ioffe Institute, Saint Petersburg, Russia

Erkki Lahderanta

Lappeenranta University of Technology, Lappeenranta, Finland

Petr Valeryevich Semenikhin, Anatoly I. Veinger, Igor V. Kochman

Ioffe Institute, Saint Petersburg, Russia

Giacomo Magnani, Daniele Pontiroli, Mauro Ricco

Università degli Studi di Parma, Dipartimento di Fisica e Scienze della Terra, Parma, Italy

Giovanni Bertoni

Istituto dei Materiali per l’Elettronica e il Magnetismo (IMEM-CNR), Parma, Italy

J. Nanophoton. 11(3), 032512 (Apr 20, 2017). doi:10.1117/1.JNP.11.032512
History: Received November 2, 2016; Accepted April 6, 2017
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Abstract.  Magnetic properties of graphene nanostructures functionalized with aromatic radicals were investigated by electron spin resonance (ESR) and superconducting quantum interference device (SQUID) techniques. Three types of functionalized graphene samples were investigated (functionalization was performed by 4-bromoaniline, 4-nitroaniline, or 4-chloroaniline). According to SQUID measurements, in case of functionalization by nitroaniline, sharp change in temperature dependence of magnetic susceptibility was observed near 120 K. Such behavior was explained as antiferromagnetic ordering. The same but more extended effect was observed in ESR measurements below 160 K. In the ESR measurements, only one resonance line with g-factor equal to 2.003 was observed. Based on the temperature dependencies of spin concentration and resonance position and intensity, the effect was explained as antiferromagnetic ordering along the extended defects on the basal planes of the graphene.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Anton A. Komlev ; Tatiana L. Makarova ; Erkki Lahderanta ; Petr Valeryevich Semenikhin ; Anatoly I. Veinger, et al.
"Antiferromagnetic transition in graphene functionalized with nitroaniline", J. Nanophoton. 11(3), 032512 (Apr 20, 2017). ; http://dx.doi.org/10.1117/1.JNP.11.032512


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