Influence of iron impurities on defected graphene

Faccio, Ricardo; Pardo, Helena; Araújo‐Moreira, F. M.; Mombrú, Álvaro W.

doi:10.1016/j.chemphys.2015.01.008

Cited by 8 publications

(4 citation statements)

References 47 publications

(64 reference statements)

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“…143 Recently, the interaction of small Fe clusters with multivacancy graphene was reported by Faccio et al The presence of Fe impurities causes a reduction in the magnetic signal due to the spin pairing between the carbon and iron. 144 A similar problem considering either a single Fe atom or a pair of interacting Fe atoms was addressed by Haldar et al 145 The impurities were placed in either armchair or zigzag channels of dehydrogenated graphene and exotic states such as a magnetic insulator or a gapless spin semiconductor can be obtained.…”

Section: Current State-of-the-art Methodologies Concerning the Magnet...mentioning

confidence: 99%

Magnetic impurities in single-walled carbon nanotubes and graphene: a review

Vejpravová

Pacáková

Kalbáč

2016

Analyst

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Control over magnetism in single-walled carbon nanotubes (SWCNTs) and graphene is of fundamental importance. Creation and manipulation using the unpaired spins without the need for archetypal magnetic elements results in sp(2)-hybridised nanocarbons being at the forefront of applications in both spintronics and nanoelectronics. The crucial limitation for the experimental observation of the intrinsic carbon magnetism stems from the presence of magnetic impurities, from which a magnetic response usually dominates. Thus, the rigorous identification of such magnetic impurities and their efficient removal is of enormous importance. The present review reports on the current state-of-the-art methodology for the detection and quantification of magnetic impurities in SWCNTs and graphene, reflecting both the preparation and subsequent purification procedures. First, the most common techniques for the preparation of SWCNTs (i.e., arc discharge, laser ablation and chemical vapour deposition) and the corresponding magnetic impurities are reviewed. Then, the available volume, surface and local probes for the identification and quantification of the impurities are discussed, and their efficiency and limitations are evaluated for the given cases. A summary of the current understanding of graphene-related magnetism in the context of the identified impurities is also given. Finally, the key knowledge is reviewed with respect to future prospects in the field.

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Section: Current State-of-the-art Methodologies Concerning the Magnet...mentioning

confidence: 99%

Magnetic impurities in single-walled carbon nanotubes and graphene: a review

Vejpravová

Pacáková

Kalbáč

2016

Analyst

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“…A, B, C, and D, stand for g66v8, g77v8, g88v8, and g99v8, respectively. In the inset, E is g66v7, where the seven‐order vacancy has only one pentagonal figure . The blue lines in the scheme show the two distances considered…”

Section: Discussion and Resultsmentioning

confidence: 99%

“…The interest for achieving graphene materials that could be useful for applications in electronics, has led to the study of defected graphene and particularly there has been great interest in the opening up of gaps driven by the creation of vacancies . While single‐vacancies and divacancies have been theoretically studied and experimentally created, multivacancies have also been studied due to the fact that they could arise using low‐cost techniques, which makes them potentially more frequent to find and easier to be produced, overcoming the disadvantage of the irregularity in their conformation under less controlled conditions . A way to describe the configurations of multivacancies has been developed through the concept of the complementary figure, that is, the geometric figure of the atomic arrangement that has been extracted from graphene in order that the multivacancy is created.…”

Section: Introductionmentioning

confidence: 99%

Possible causes for rippling in a multivacancy graphene system

Mombrú

Faccio

Mombrú

2017

Int J of Quantum Chemistry

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The occurrence of ripples in an eight‐atom vacancy graphene system was analyzed through first principles calculations based on density functional theory. The study focuses on the conditions that should be considered in order that ripples could occur in the single layer defected graphene. The vacancies concentration, especially the pentagonal figures formed after relaxation of the vacant system, and the distances between neighbor pentagons, are found to be key aspects for rippling occurrence, with no charge distribution consequence. Two different configurations of rippling have been found where the position of the pentagonal figures is discussed as the driving force for any of them to occur.

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“…The interaction of ZV Fe and graphene has been recently explored from a fundamental perspective. Density functional calculations investigating the adsorption of Fe adatoms or clusters on graphene (layers and nanoribbons) have been undertaken to determine the structural, electronic, vibrational and magnetic properties [21][22][23][24][25]. In addition, theoretical and experimental studies into the intercalation of magnetic Fe adatoms on graphene have reported significant changes in the electronic properties [26].…”

Section: Introductionmentioning

confidence: 99%

Zero valence iron nanocube decoration of graphitic nanoplatelets

Brack¹,

Spencer²,

Mapleback³

et al. 2021

Nanotechnology

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Graphitic nanoplatelets (GNPs) have been treated using an ultrasonicated ozonolysis procedure to produce stable aqueous dispersions that facilitate deposition of thin films using electrophoretic deposition. The thin GNP films were then coated with zero valence (ZV) iron nanocubes using a pulsed electrodeposition technique. Characterization of the ZV-iron coating with deposition time revealed that the changing magnetic character of the ferromagnetic-graphitic hybrid material was related to the nucleation density and growth of the ZV-iron nanocubes. Density functional theory calculations show a preference for ZV-iron adsorption at the oxygen sites of the GNPs, with ZV-iron displacement of oxygen groups favored in some configurations. Transmission electron microscopy studies confirm ZV-iron growth nucleates preferentially at the graphite nanoplatelet edges and the hybrid material magnetism is affected by the convergent crystalline grain boundaries formed between adjacent ZV-iron nanocubes.

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Influence of iron impurities on defected graphene

Cited by 8 publications

References 47 publications

Magnetic impurities in single-walled carbon nanotubes and graphene: a review

Magnetic impurities in single-walled carbon nanotubes and graphene: a review

Possible causes for rippling in a multivacancy graphene system

Zero valence iron nanocube decoration of graphitic nanoplatelets

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