Graphene quantum dots are quasi-zero-dimensional nanomaterials

Graphene quantum dots are quasi-zero-dimensional nanomaterials, and their internal electrons are restricted in all directions, so the quantum confinement effect is particularly significant and has many unique properties. This may bring revolutionary changes in the fields of electronics, optoelectronics and electromagnetics. Used in solar cells, electronic equipment, optical dyes, biomarkers and composite particle systems. Graphene quantum dots have important potential applications in the fields of biology, medicine, materials, and new semiconductor devices. Single-molecule sensors can be realized, and ultra-small transistors or on-chip communication using semiconductor lasers may be used to make chemical sensors, solar cells, medical imaging devices, or nano-scale circuits.
Graphene double quantum dots have different sizes of quantum dot structures. The large quantum dots are also called single-electron transistors (SET), which are used as detectors to read out the charge state in the small quantum dots nearby. The graphene series double quantum dot device controlled by single-electron transistor and multi-gate can be adjusted from weak to strong through low-temperature transport. This causes the tunneling coupling energy to change, indicating that this highly controllable system is very promising to become a nuclear-spin-free quantum information device in the future. The scientists also measured the double-layer graphene parallel double quantum dots controlled by the gate. Through the regulation of the back gate and the side gate electrode, the parallel double points can be adjusted to different coupling intervals. The relevant data are extracted from the honeycomb diagram of the double point coupling. The high sensitivity of the coupling capacitance, coupling energy and other parameters can clearly detect the Coulomb blocking signal and the excited state energy spectrum in the quantum dot, and even the weak Coulomb charging signal that cannot be measured by traditional transport can be detected.
Graphene quantum dots (GQD) based materials may make OLED displays and solar cells cheaper to produce. The new GQD does not use any toxic metals (such as: cadmium, lead, etc.). Using GQD-based materials may make future OLED panels lighter, more flexible, and lower in cost.
In the field of biomedicine, graphene quantum dots have great application prospects. In terms of biological imaging, it has been confirmed theoretically and experimentally that quantum confinement effects and boundary effects can induce graphene quantum dots to emit fluorescence. In the field of biomedical research, fluorescent labels are often used to calibrate research objects, but the long excitation time makes the fluorescence ineffective, which is called photo bleaching, which limits the application of general fluorescent agents in biomedicine. Graphene quantum dots have a stable fluorescent light source. Defects generated during the production of graphene quantum dots. When nitrogen atoms occupy the position of the original carbon atoms in the production of graphene quantum dots, they break away, causing a nitrogen vacancy in the position (NitrogenVacancy, NV), and the defect will fluoresce after being excited by visible light. Graphene quantum dots of different sizes have different fluorescence spectra, which can provide extremely stable phosphors for biomedical research. Compared with phosphors, the advantage of graphene quantum dots is that the emitted fluorescence is more stable, and there will be no photobleaching, so it is not prone to light attenuation and loss of its fluorescence. This may become a very promising way to further explore biological imaging

Graphene quantum dots are also very good drug carriers. It has good biocompatibility and aqueous solution stability, and is conducive to chemical functional modification to achieve the purpose of application in different fields. Utilizing the different chemical reactivity of oxygen-containing active groups, it can covalently react with a variety of chemical groups and functional molecules with specific chemical and biological properties. The common covalent modification methods are through acylation and esterification reactions. Biomolecules or chemical groups are modified on graphene, and non-covalent bonds such as π-π interactions, ionic bonds and hydrogen bonds can also be used to functionalize the surface of graphene. Graphene quantum dots have been proven by a research team that they are not cytotoxic. Graphene-based drug carriers are expected to be clinically promising due to their ultra-high drug loading, targeted delivery and controlled release of drugs, and graphene quantum dots as drug carriers can break through the blood-brain barrier and achieve direct drug delivery to the brain. Realize practical applications.

Due to edge states and quantum limitations, the shape and size of graphene quantum dots will determine their electrical, optical, magnetic, and chemical properties. It is a difficult problem to obtain a large number of graphene quantum dots with specific edge shapes and uniform sizes. At present, top-down graphene quantum dot synthesis methods are obtained by lithography, sonochemical method, hydrothermal method, fullerene cage opening, chemical decomposition of carbon nanotube release, or electron beam etching. However, these methods all have low productivity, uncontrollable shape and size, unsmooth edges, expensive manufacturing, and it takes several weeks to manufacture a little graphene quantum dots. We have solved a large number of process technologies for manufacturing graphene quantum dots with stable size and shape, and can provide a large number of graphene quantum dots of different specifications.

SAT NANO can supply the graphene quantum dots, here is the specification,

Concentration range: 20mg/ml, another 1mg/ml
Diameter: Average diameter: 15nm
Thickness: 0.5-2nm
Purity: ~80% (the quantum dot solution contains a small amount of NaOH, adjust its PH and add)
PL quantum yield: 9% (relative intensity)
Elemental analysis: C: 46.22% O: 49.91% H: 3.87%
Generally Blu-ray

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