Magnetism of Nanographene

Enoki, Toshiaki

doi:10.1002/9783527651122.ch4

Cited by 24 publications

(50 citation statements)

References 47 publications

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“…[28], both approaches have the same limit of validity of approximately −2.0 eV to 1.5 eV, when it is compared with the tight-binding results. Similar mismatch is observed for the graphene nanoribbon case, such that the analytic solution based on the boundary conditions described by Brey 29 does not match in higher energy range 30,31 . By analyzing the set of equations (17), one can see that by rewriting them in terms of δ i and z, with i = 1, 2, they lead to the condition exp(2zW ) = 1, resulting in a pure imaginary z, as obtained in the first case.…”

Section: Armchair Phosphorene Nanoribbonsmentioning

confidence: 54%

“…7,8,20,21 A series of recent studies have obtained the electronic dispersion using approaches such as first principles calculations 14,16,[22][23][24] , tight-binding model 22,25 , k · p methods 26,27 , and a longwavelength approximation 28 . Following the example of graphene nanoribbons [29][30][31] , one can expect that the electronic spectrum and the transport properties of narrow phosphorene ribbons can be significantly distinct from the case of an infinite sample. Recent studies of BPNs have been based on a tight-binding approach [32][33][34] and via first-principles simulations 23,24,35 that, while giving reasonably precise results for small structures, can become computationally expensive for larger structures.…”

Section: Introductionmentioning

confidence: 99%

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Boundary conditions for phosphorene nanoribbons in the continuum approach

et al. 2016

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We investigate the energy spectrum of single layer black phosphorene nanoribbons (BPN) by means of a low-energy expansion of a recently proposed tight-binding model that describes electron and hole bands close to the Fermi energy level. Using the continuum approach, we propose boundary conditions based on sublattice symmetries for BPN with zigzag and armchair edges and show that our results for the energy spectra exhibit good agreement with those obtained by using the five-parameter tight-binding model. We also explore the behaviour of the energy gap versus the nanoribbon width W . Our findings demonstrate that band gap of armchair BPNs scale as 1/W 2 , while zigzag BPNs exhibit a 1/W tendency. We analyse the different possible combinations of the zigzag edges that result two-fold degenerate and non-degenerate edge states. Furthermore, we obtain expressions for the wave functions and discuss the limit of validity of such analytical model.

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Section: Armchair Phosphorene Nanoribbonsmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Boundary conditions for phosphorene nanoribbons in the continuum approach

et al. 2016

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“…In order to observe these interesting phenomena, several techniques have been designed by experimentalists to examine these propositions. 17 In this report, we show the effect of edge modification on the magnetic states of exfoliated graphite (EG) which mainly consists of twisted bi and tri-layered graphene. The different magnetic contributions in graphene have been separated using low field (LF)-high field (HF) hysteresis loops so as to emphasize the effect of interactions that induce FM behavior in it.…”

mentioning

confidence: 98%

“…Hubbard model and density functional theory calculations support the formation of spin polarized edge states. 17 There could be an intra or interzigzag interaction resulting in a FM or AFM state. 17,26 The AFM state is due to the conduction p-electrons mediating the spin polarized zigzag edge state spins.…”

mentioning

confidence: 99%

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Deconvolution of mixed magnetism in multilayer graphene

Swain

Bahadur

2014

Applied Physics Letters

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Magnetic properties of graphite modified at the edges by KCl and exfoliated graphite in the form of twisted multilayered graphene (<4 layers) are analyzed to understand the evolution of magnetic behavior in the absence of any magnetic impurities. The mixed magnetism in multilayer graphene is deconvoluted using Low field-high field hysteresis loops at different temperatures. In addition to temperature and the applied magnetic field, the density of edge state spins and the interaction between them decides the nature of the magnetic state. By virtue of magnetometry and electron spin resonance studies, we demonstrate that ferromagnetism is intrinsic and is due to the interactions among various paramagnetic centers. The strength of these magnetic correlations can be controlled by modifying the structure.

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Theranostic applications of multifunctional carbon nanomaterials

Asil

Guerrero

Bugarini

et al. 2023

VIEW

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Nanobiotechnology is one of the leading research areas in biomedical science, developing rapidly worldwide. Among various types of nanoparticles, carbon nanomaterials (CNMs) have attracted a great deal of attention from the scientific community, especially with respect to their prospective application in the field of disease diagnosis and therapy. The unique features of these nanomaterials, including favorable size, high surface area, and electrical, structural, optical, and chemical properties, have provided an excellent opportunity for their utilization in theranostic systems. Carbon nanotubes, carbon quantum dots, graphene, and fullerene are the most employed CNMs in biomedical fields. They have been considered safe and efficient for non‐invasive diagnostic techniques such as fluorescence imaging, magnetic resonance imaging, and biosensors. Various functionalized CNMs exhibit a great capacity to improve cell targeting of anticancer drugs. Due to their thermal properties, they have been extensively used in cancer photothermal and photodynamic therapy assisted by laser irradiation and CNMs. CNMs also can cross the blood‐brain barrier and have the potential to treat various brain disorders, for instance, neurodegenerative diseases, by removing amyloid fibrils. This review has summarized and emphasized on biomedical application of CNMs and their recent advances in diagnosis and therapy.

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Magnetism of Nanographene

Cited by 24 publications

References 47 publications

Boundary conditions for phosphorene nanoribbons in the continuum approach

Boundary conditions for phosphorene nanoribbons in the continuum approach

Deconvolution of mixed magnetism in multilayer graphene

Theranostic applications of multifunctional carbon nanomaterials

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