Results 71 to 80 of about 60,665 (288)

Coherent optical effects in two-dimensional nanostructures with semiconductor quantum dots [PDF]

open access: yesEPJ Web of Conferences, 2019
The effects of quantum coherence arising in an ensemble of semiconductor quantum dots located near the surface of two-dimensional optical materials are considered.
Prokhorov Alexei, Volkov Valentyn
doaj   +1 more source

Manifestation of the shape and edge effects in spin-resolved transport through graphene quantum dots

open access: yes, 2012
We report on theoretical studies of transport through graphene quantum dots weakly coupled to external ferromagnetic leads. The calculations are performed by exact diagonalization of a tight-binding Hamiltonian with finite Coulomb correlations for ...
I. Weymann   +3 more
core   +1 more source

Electron-vibron coupling in suspended carbon nanotube quantum dots [PDF]

open access: yes, 2009
Motivated by recent experiments, we investigate the electron-vibron coupling in suspended carbon nanotube quantum dots, starting with the electron-phonon coupling of the underlying graphene layer. We show that the coupling strength depends sensitively on
A. N. Cleland   +6 more
core   +2 more sources

Graphene quantum dots in photodynamic therapy

open access: yesNanoscale Advances, 2020
Single-atomic-layered graphene quantum dots with lateral sizes of ∼5 and 20 nm are not photosensitizers for photodynamic therapy.
Jiayi Chen   +7 more
openaire   +3 more sources

Prospects of Electric Field Control in Perpendicular Magnetic Tunnel Junctions and Emerging 2D Spintronics for Ultralow Energy Memory and Logic Devices

open access: yesAdvanced Functional Materials, EarlyView.
Electric control of magnetic tunnel junctions offers a path to drastically reduce the energy requirements of the device. Electric field control of magnetization can be realized in a multitude of ways. These mechanisms can be integrated into existing spintronic devices to further reduce the operational energy.
Will Echtenkamp   +7 more
wiley   +1 more source

High-efficiency upconversion process in cobalt and neodymium doped graphene QDs for biomedical applications

open access: yesScientific Reports, 2023
Multiphoton absorbing upconversion nanoparticles are emerging as bioimaging materials but are limited by the low quantum yield of their visible fluorescence.
Armin Zarghami   +3 more
doaj   +1 more source

Nanocomposites of Carbon Quantum Dots and Graphene Quantum Dots: Environmental Applications as Sensors

open access: yesChemosensors, 2022
Carbon-based quantum dots and their nanocomposites have sparked immense interest for researchers as sensors due to their attractive physico-chemical properties caused by edge effects and quantum confinement.
Ajaypal Kaur   +4 more
doaj   +1 more source

Electronic properties of mesoscopic graphene structures: charge confinement and control of spin and charge transport

open access: yes, 2011
This brief review discusses electronic properties of mesoscopic graphene-based structures. These allow controlling the confinement and transport of charge and spin; thus, they are of interest not only for fundamental research, but also for applications ...
Bliokh, Yury P.   +4 more
core   +1 more source

Z‐Scheme Water Splitting Systems Based on Solid‐State Electron Conductors

open access: yesAdvanced Functional Materials, EarlyView.
This review examines the latest advances in Z‐scheme overall water splitting (OWS) systems for solar hydrogen production. These systems consist of suspended or immobilized hydrogen evolution photocatalysts (HEPs) and oxygen evolution photocatalysts (OEPs).
Chen Gu   +3 more
wiley   +1 more source

Hydrothermal Unzipping of Multiwalled Carbon Nanotubes and Cutting of Graphene by Potassium Superoxide

open access: yesNanomaterials, 2022
The dual use of potassium superoxide (KO2) to unzip multiwalled carbon nanotubes (MWCNTs) and cut graphene under hydrothermal conditions is described in this work.
Apostolos Koutsioukis   +4 more
doaj   +1 more source

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