Product Name
Name：Silicon-doped carbon quantum dots
Product Overview
Carbon quantum dots CQDs are quasi spherical amorphous carbon nanocrystals composed of sp2 and sp3 cluster carbon structures, surrounded by abundant oxygen-containing functional groups such as hydroxyl, carbonyl, carboxyl, etc. Their main constituent elements are C, H, O, and N. The luminescence mechanism of CQDs can be mainly attributed to these three types: quantum confinement effect, surface state luminescence, and molecular state luminescence. Carbon quantum dots are composed of C=C and C-C bond cores that are prone to π→π * transitions, as well as various organic molecular functional groups distributed on the surface that are prone to n →π * transitions. The structure and composition of carbon quantum dots result in strong absorption of short wavelength light waves in the ultraviolet range (260-320 nm), accompanied by low-intensity absorption of visible light (400-710 nm).
The preparation methods of carbon quantum dots are divided into top-down method and top-down method. The top-down method is to cut large-sized carbon structural materials through physical or chemical methods, mainly including arc discharge, laser ablation, ultrasonic treatment, and chemical oxidation. The bottom-up approach is to aggregate small molecule precursors into large-sized CQDs through chemical reactions, mainly including water/solvothermal, template method, microwave-assisted, and solid-phase methods.
In order to improve the fluorescence properties of CQDs, surface functionalization and heteroatom doping are the two most effective methods. Some heteroatoms such as N, S, Se, B, etc. have been reported as dopants, and Si, as one of the IV group elements, has good biocompatibility and environmental friendliness, so it can be used for doping CQDs. XF297 is Si CQDs obtained by hydrothermal pyrolysis of a silane coupling agent.
Technical Parameter
Size: 2-5 nm
Luminous color:Green light
C:1mg/ml,WATER
Product Features
Good water solubility: The surface usually contains abundant hydrophilic groups, such as hydroxyl and carboxyl groups, which enable them to be uniformly dispersed in the aqueous phase, facilitating their application in biological systems and aqueous environments.
Enhanced optical performance: Silicon doping often increases the fluorescence quantum yield of carbon quantum dots, making their fluorescence emission stronger and brighter.
Adjustable optical bandgap: By controlling the doping amount, its optical absorption and emission wavelengths can be flexibly adjusted.
Improved charge transfer characteristics: Helps with the migration and transfer of electrons in materials.
Application Fields
Medical testing: As a highly sensitive fluorescent probe, it detects specific molecules in the body, such as proteins, nucleic acids, etc. For example, used to detect the levels of specific disease markers in the blood.
Cell imaging: It can clearly display the structure and physiological processes of cells. For example, tracking the dynamic changes of intracellular calcium ions.
Optoelectronic devices: Preparation of light-emitting diodes (LEDs) to improve luminous efficiency and color purity. Applied to solar cells, enhancing charge separation and transmission, and improving energy conversion efficiency.
Catalysis field: Participate in chemical reactions as a catalyst or co catalyst, such as photocatalytic water splitting to produce hydrogen gas. Accelerate the degradation process of organic pollutants and improve environmental quality.
Related Information
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