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Graphene quantum dots (GQDs) are graphene nanoparticles with a size less than 100 nm. [1] Due to their exceptional properties such as low toxicity, stable photoluminescence , chemical stability and pronounced quantum confinement effect, GQDs are considered as a novel material for biological, opto-electronics, energy and environmental applications.
Download as PDF; Printable version; ... Help. Pages in category "Quantum dots" The following 19 pages are in this category, out of 19 total. ... Graphene quantum dot; H.
Fabrication of the quantum dot LED involved a blue chip as a blue light source and a silicon resin containing the quantum dots on top of the chip creating the sample, with good results obtained from the experiment. [23] Silicon A third type of quantum dot that does not contain heavy metals is the silicon quantum dot.
Graphene quantum dots have also been blended with organic electronic materials to improve efficiency and lower cost in photovoltaic devices and organic light emitting diodes compared to graphene sheets. These graphene quantum dots were functionalized with organic ligands that experience photoluminescence from UV–visible absorption. [103]
Research is exploring the creation of quantum dots by changing the width of GNRs at select points along the ribbon, creating quantum confinement. [27] [20] Heterojunctions inside single graphene nanoribbons have been realized, among which structures that have been shown to function as tunnel barriers.
Small graphene structures, such as graphene quantum dots and nanoribbons, can be produced by "bottom-up" methods that assemble the lattice from organic molecule monomers (e. g. citric acid, glucose). "Top-down" methods, on the other hand, cut bulk graphite and graphene materials with strong chemicals (e. g. mixed acids). [255]
The ribbons' conductance exceeds predictions by a factor of 10. The ribbons can act more like optical waveguides or quantum dots, allowing electrons to flow smoothly along the ribbon edges. In copper, resistance increases in proportion to length as electrons encounter impurities. [20] [21]
Graphene quantum dots (GQDs) keep all dimensions less than 10 nm. Their size and edge crystallography govern their electrical, magnetic, optical, and chemical properties. GQDs can be produced via graphite nanotomy [ 85 ] or via bottom-up, solution-based routes ( Diels-Alder, cyclotrimerization and/or cyclodehydrogenation reactions ). [ 86 ]