Magnetism of aniline modified graphene-based materials

Komlev, A.A.; Makarova, T. L.; Lähderanta, E.; Semenikhin, P. V.; Veĭnger, A. I.; Tisnek, T. V.; Magnani, Giacomo; Bertoni, Giovanni; Pontiroli, Daniele; Riccò, Mauro

doi:10.1016/j.jmmm.2015.11.053

Cited by 4 publications

(5 citation statements)

References 22 publications

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“…This can be also a trace of ferromagnetism. However, in our previous work [10] the same jump near 120 K, but without shift to paramagnetic region, was observed for functionalized graphene samples. In that work, carbon origin of this effect was approved by ESR measurements.…”

Section: Magnetic Measurements Of Clean and Copper-modified Coalssupporting

confidence: 68%

“…Rough estimation will give approximately the same value of change of magnetic susceptibility due to antiferromagnetic transition, as going from 20 ppm of Fe2O3 [12]. However, the similar phenomenon was observed in other carbon samples by ESR [10], indicating that this effect is going from defect-induced carbon paramagnetic spins. Furthermore, observed shift of magnetic susceptibility of carbon coal to paramagnetic region at room temperatures, already needs hundreds ppm of Fe.…”

Section: Discussionmentioning

confidence: 71%

“…Two other features of magnetic susceptibility of this coal are not typical for carbon materials. While carbon materials usually demonstrate diamagnetic behavior without any sharp changes [9,10]. Jump of magnetic susceptibility near 120 K can be interpreted as antiferromagnetic transition.…”

Section: Magnetic Measurements Of Clean and Copper-modified Coalsmentioning

confidence: 99%

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Magnetism of purified amorphous carbon

et al. 2018

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In this work, magnetic properties of activated carbon coal, which is also named amorphous carbon, were investigated. Composition and structure analysis was performed by XRD, SEM and EDS techniques. Position and width of peaks on XRD pattern confirmed amorphous structure of coals with small degree of graphitization. Magnetic measurements were performed by SQUID magnetometer. According to thermomagnetic measurements, in part of the samples, antiferromagnetic transition was observed near 120 K. Nature of such phenomena, as well as effect of oxygen and magnetic contaminations on thermomagnetic measurements are discussed referring to similar results from previous researches and data from literature.

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Section: Magnetic Measurements Of Clean and Copper-modified Coalssupporting

confidence: 68%

Section: Discussionmentioning

confidence: 71%

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Magnetism of purified amorphous carbon

et al. 2018

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“…Also, at low coverage hydrogen can induce a three-orderof-magnitude enhancement of the spin-orbit interaction in graphene [168]. Eventually, magnetic properties for organically functionalized graphene samples have recently been measured showing the occurrence of antiferromagnetic domains [169].…”

Section: Induced Spin Distributionsmentioning

confidence: 99%

Energetic Ground State Calculations, Electronic Band Structure at Surfaces

Brivio

Fratesi

2020

Springer Handbooks

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Energetic ground state calculation and Electronic band structure at surfaces are an important field of research in surface science, since crystallographic surfaces have been grown under ultra high vacuum conditions and several surface sensitive techniques have been developed. Currently clean, almost 2D periodic surfaces can be obtained even after adsorbing complex organic molecules.Adsorption is a very relevant phenomenon and well known are its implications to corrosion, heterogeneous catalysis and more recently to organic electronics. But the understanding of such processes requires that of bonding of atoms and molecules at solid surfaces. Nowadays a joint experimental and theoretical efforts, based on first principles calculations, strongly propelled by the enormously increased computer power, is often successful in determining adsorption sites, geometry, possible surface reconstruction, orientation of molecules, potential energy barriers, wavefunctions, vibrations, and more recently in a few cases many-body properties such as plasmon, polariton on metals, magnons, etc.. The density of states of the clean surface and of that of the projected surface bands onto the molecular eigenstates enjoy now clearer pictures. We can distinguish surface projected bulk states, resonant surface ones but also localized surface electronic states. Refined two photon photoemission experiments or inverse photoemission ones have detected image potential states determined by the long range Coulomb tails of the surface potential. Quantum well states localized between an adsorbate overlayer and the surface are also important. Surface states can be used as a tool to monitor adsorption but may also occur as a consequence of such phenomena.The study of molecule-surface interaction boast a great variety of systems and of

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“…4b) which is typically observed for oxygen-coordinated metal absorbers. [47][48][49][50] The presence of CuO could be discarded by the XANES results, particularly by the position of the edge feature of the spectra. 51,52 It is noteworthy that the simulations of the EXAFS signal were successful only considering the AuCu and Cu 2 O phases, rather than CuO.…”

Section: Structural Propertiesmentioning

confidence: 99%