Carbon quantum dot

Carbon quantum dotProduct Name NameCarbon quantum dot 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

Product Name

Name：Carbon quantum dot

^{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.

^{Technical Parameter}

Status: Yellow liquid

Particle size: 2-5 nm

Concentration: 1mg/ml, solvent ethanol

Luminous color: Green light

^{Product Features}

1. Low toxicity and good biocompatibility: Carbon quantum dots have low toxicity to organisms and do not cause significant cell damage or immune reactions.

2. High chemical stability: able to maintain stable structure and performance over a wide range of pH values, temperature conditions, and chemical environments.

3. Easy to functionalize: The abundant functional groups on the surface provide active sites for further chemical modification, which can connect various biomolecules, drug molecules, or other functional groups.

4. Excellent optical performance: It has strong fluorescence emission and high fluorescence quantum yield. Its fluorescence emission wavelength can be adjusted by changing the size, surface state, or doping.

Application Fields

1. Biological imaging: Carbon quantum dots have good biocompatibility and low toxicity, and can enter the interior of cells without producing significant cytotoxicity. For example, carbon quantum dots modified with specific antibodies can specifically label antigens on the surface of cancer cells, enabling high-resolution imaging of cancer cells and aiding in early diagnosis of cancer.

2. Biological detection: Due to the influence of metal ions on the fluorescence of carbon quantum dots, they can be used to detect metal ions in the environment or biological samples. For example, when mercury ions are present, the fluorescence of carbon quantum dots will be quenched, thereby achieving sensitive detection of mercury ions. At the same time, it can interact with specific biomolecules (such as proteins, nucleic acids, glucose, etc.) to cause fluorescence changes, which is used for quantitative detection of biomolecules. For example, by binding to aptamers, carbon quantum dots can specifically recognize and detect trace biomarkers in the blood, such as tumor markers.

3. Photocatalytic water splitting for hydrogen production: Composite with semiconductor materials to promote the separation and transfer of photogenerated charges, improving the efficiency of photocatalytic water splitting for hydrogen production. For example, loading carbon quantum dots on the surface of titanium dioxide significantly enhances its photocatalytic activity under visible light and increases hydrogen production.

4. Light emitting devices: Used as a light emitting layer or auxiliary layer in LEDs to improve device performance. For example, carbon quantum dot based LEDs can achieve high brightness and wide color gamut luminescence.

5. Drug carrier: Using its surface functional groups to load drug molecules and achieving controlled drug release through stimulus response (such as pH, temperature, light, etc.). For example, in acidic environments (such as the microenvironment of tumor tissue), carbon quantum dot drug delivery systems release drugs to achieve targeted therapy for tumors.

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