Single-particle energy – and optical absorption – spectra of multilayer graphene quantum dots

Wimmenauer, Christian; Scheller, Juergen; Fasbender, Stefan; Heinzel, T.

doi:10.1016/j.spmi.2019.106171

Cited by 5 publications

(4 citation statements)

References 52 publications

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“…It is the strongest material ever discovered and is comparable to diamond [9]. Additionally, it demonstrates consistent absorption across the visible and near-infrared light spectrums along with impermeable behaviour to gases [10][11][12][13]. Graphene's high mechanical strength allows it to be used in the strengthening of other materials.…”

Section: Introductionmentioning

confidence: 99%

A Review on Properties and Environmental Applications of Graphene and Its Derivative-Based Composites

et al. 2023

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Graphene-based materials have gained a lot of scientific interest in the research era of modern technology, which can be quite flexible. Graphene has become popular as a potential material for the manufacture of a wide range of technologies due to its remarkable electrical, mechanical, and optical traits. Due to these excellent characteristics, the derivatives of graphene can be functionalized in various applications including environmental, medical, electronic, defence applications, and many more. In this review paper, we discussed the different synthesis methods for the extraction of graphene and its derivatives. The different traits of graphene and its derivatives such as structural, mechanical, and optical were also discussed. An extensive literature review on the application of graphene-based composites is presented in this work. We also outlined graphene’s potential in the realm of environmental purification through different techniques such as filtration, adsorption, and photocatalysis. Lastly, the challenges and opportunities of graphene and its derivatives for advanced environmental applications were reported.

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Section: Introductionmentioning

confidence: 99%

A Review on Properties and Environmental Applications of Graphene and Its Derivative-Based Composites

et al. 2023

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“…Constituting a ubiquitous representative of modern 2D materials [1,7], graphene along with its unique properties have been extensively experimentally and theoretically studied [8,11,19,21]. Single and multilayer graphene quantum dots [23,41,45,59], nanoribbons [9,63] and nanotubes [10,12] represent significant classes of mesoscopic graphenebased structures [54]. Single and multiparticle propagation characteristics [16,52], behaviours in electric and magnetic fields [17,18,39] together with optical properties [6,35,50] of these graphene structures have been researched.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, contrary to presence of a single Dirac cone in the armchair dispersion relation [53], emergence of two Dirac cones in the zigzag dispersion relation potentially contributes to the study of graphene electronic structure around the Fermi level [24,52,62]. Moreover, further enhancement of the developed models conceivably advances research of graphene spintronic properties [55], electronic transport [18], magnetic [9,22,35] and optical properties [48,50,59] along with plasmons [42,58], excitons and biexcitons [47].…”

Section: Introductionmentioning

confidence: 99%

On electron propagation in triangular graphene quantum dots

Hrivnák¹,

Motlochová²

2022

J. Phys. A: Math. Theor.

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Tight-binding models of electron propagation in single-layer triangular graphene quantum dots with armchair and zigzag edges are developed. The electron hoppings to the nearest and next-to-nearest neighbours on the honeycomb lattice as well as interactions with the confining Dirichlet and Neumann walls are incorporated into the resulting tight-binding Hamiltonians. Associated to the irreducible crystallographic root system A 2, the armchair and zigzag honeycomb Weyl orbit functions together with the related discrete Fourier–Weyl transforms provide explicit exact forms of the electron wave functions and energy spectra. The electronic probability densities corresponding to the armchair and zigzag dots are evaluated and their contrasting behaviour exemplified.

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“…They have been reported to be comparable [16] to CDs and have similar dimensions, photoluminescence properties, surface characteristics, and were shown to be biologically applicable [22]. There exists a continuum of species, starting with single-layer GQDs [22,23], moving to multilayer GQDs [24,25] and finally to CDs [26,27], all of which can have similar dimensions and structure but generally differ in their height profiles determined by atomic force microscopy (AFM). Due to these similarities as well as the initial synthesis precursors and conditions reported for the production of CDs [8,28,29] and GQDs [9,22,30], there is often no clear distinction between these nanomaterial classes, especially when comparing multilayer GQDs to CDs [31].…”

Section: Introductionmentioning

confidence: 99%

Biomass-Derived Nitrogen Functionalized Carbon Nanodots and Their Anti-Biofouling Properties

et al. 2020

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The prevalence of the antibiotic resistant bacteria remains a global issue. Cheap, sustainable and multifunctional antibacterial membranes are at the forefront of filtrating materials capable of treating multiple flow streams, such as water cleansing treatments. Carbon nanomaterials are particularly interesting objects shown to enhance antibacterial properties of composite materials. In this article, amino-functionalized, photoluminescent carbon nanodots (CNDs) were synthesized from chitosan by bottom-up approach via simple and green hydrothermal carbonization. A chemical model for the CNDs formation during hydrothermal treatment of chitosan is proposed. The use of urea as an additional nitrogen source leads to the consumption of hydroxyl groups of chitosan and higher nitrogen doping level as pyridinic and pyrrolic N-bonding configurations in the final carbonaceous composition. These functionalized carbon nanodots that consist of carbon core and various surface functional groups were used to modify the commercially available membranes in order to enhance their anti-biofouling properties and add possible functionalities, including fluorescent labelling. Incorporation of CNDs to membranes increased their hydrophilicity, surface charge without compromising membranes integrity, thereby increasing the factors affecting bacterial wall disruption. Membranes modified with CNDs effectively stopped the growth of two Gram-negative bacterial colonies: Klebsiella oxytoca (K. oxytoca) and Pseudomonas aeruginosa (P. aeruginosa).

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Single-particle energy – and optical absorption – spectra of multilayer graphene quantum dots

Cited by 5 publications

References 52 publications

A Review on Properties and Environmental Applications of Graphene and Its Derivative-Based Composites

A Review on Properties and Environmental Applications of Graphene and Its Derivative-Based Composites

On electron propagation in triangular graphene quantum dots

Biomass-Derived Nitrogen Functionalized Carbon Nanodots and Their Anti-Biofouling Properties

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