Electronic and magnetic properties of graphene quantum dots doped with alkali metals

Osman, Waleed; Abdelsalam, Hazem; Saad, Mohamed A.; Teleb, Nahed H.; Yahia, I.S.; Ibrahim, Medhat; Zhang, Q.

doi:10.1016/j.jmrt.2021.01.119

Cited by 45 publications

(11 citation statements)

References 35 publications

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“…Initially, the geometries of O-GQD, BC 2 O-GQD and BCO 2 -GQD are optimized individually. The optimized structures are presented in Fig.1.After the optimization, near the attached functional groups, the C-C bond length changes from its standard value 1.42 Å to 1.5 Å in O-GQD , to ~1.48 Å in BCO 2 -GQD, and 1.52 Å in BC 2 O-GQD, in agreement with previous studies on GQDs[59][60][61][62][63]. The change in C-C bond length strongly depends on the atomic radius of the dopant.…”

supporting

confidence: 88%

Role of functionalized graphene quantum dots in hydrogen evolution reaction: A density functional theory study

Sharma

Roondhe

Saxena

et al. 2022

International Journal of Hydrogen Energy

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supporting

confidence: 88%

Role of functionalized graphene quantum dots in hydrogen evolution reaction: A density functional theory study

Sharma

Roondhe

Saxena

et al. 2022

International Journal of Hydrogen Energy

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“…Osman W. and their colleagues use density functional theory to examine the electrical and magnetic properties of armchair-hexagonal (AHEX) and zigzag-triangular (ZTRI) graphene quantum dots doped with alkali metals [ 35 ]. Alkali metals (Li, Na, and K) act as dopants by substituting one of the C-atoms present inside the flake in various locations.…”

Section: Applicationsmentioning

confidence: 99%

Recent Advances in the Spintronic Application of Carbon-Based Nanomaterials

2023

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The term “carbon-based spintronics” mostly refers to the spin applications in carbon materials such as graphene, fullerene, carbon nitride, and carbon nanotubes. Carbon-based spintronics and their devices have undergone extraordinary development recently. The causes of spin relaxation and the characteristics of spin transport in carbon materials, namely for graphene and carbon nanotubes, have been the subject of several theoretical and experimental studies. This article gives a summary of the present state of research and technological advancements for spintronic applications in carbon-based materials. We discuss the benefits and challenges of several spin-enabled, carbon-based applications. The advantages include the fact that they are significantly less volatile than charge-based electronics. The challenge is in being able to scale up to mass production.

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“…Choosing a relevant synthesis method is critical for using GQDs in a desired application as the physical and chemical properties of GQDs are sensitive to their size, doping, defects, atomic edge structure, and surface functionalization, − which are affected by the fabrication methods. Recent theoretical studies have predicted that the energy gap and edge states of GQDs depend on passivation , and doping . Oxygen passivation can effectively decrease the energy gap in GQDs, and quantum dot shape, edge termination, and functional groups can influence their dipole moments .…”

Section: Introductionmentioning

confidence: 99%

Top-Down Fabrication of Luminescent Graphene Quantum Dots Using Self-Assembled Au Nanoparticles

2023

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A new graphene quantum dot (GQD) fabrication method is presented, which employs a lithographic approach based on self-assembled Au nanoparticles formed by solid-state dewetting. The GQDs are formed by the patterned etching of a graphene layer enabled by Au nanoparticles, and their size is controllable through that of the Au nanoparticles. GQDs are fabricated with four different diameters: 12, 14, 16, and 27 nm. The geometrical features and lattice structures of the GQDs are determined using transmission electron microscopy (TEM). Hexagonal lattice fringes in the TEM image and G- and 2D-band Raman scattering evidence the graphitic characteristics of the GQDs. The oxygen content can be controlled by thermal reduction under a hydrogen atmosphere. In GQDs, the absorption peak wavelengths in the ultraviolet range tend to decrease as the size of the GQDs decreases. They also exhibit apparent photoluminescence (PL). The PL peak wavelength is approximately 600 nm and becomes shorter as the size of the GQDs decreases. The blue shift in the optical absorption and PL of the smaller GQDs is attributed to the quantum confinement effect. The proposed GQD fabrication method can provide a way to control the physical and chemical properties of GQDs via their size and oxygen content.

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Electronic and magnetic properties of graphene quantum dots doped with alkali metals

Cited by 45 publications

References 35 publications

Role of functionalized graphene quantum dots in hydrogen evolution reaction: A density functional theory study

Role of functionalized graphene quantum dots in hydrogen evolution reaction: A density functional theory study

Recent Advances in the Spintronic Application of Carbon-Based Nanomaterials

Top-Down Fabrication of Luminescent Graphene Quantum Dots Using Self-Assembled Au Nanoparticles

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