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Fluorescent carbon quantum dot with magnolia alba leaf blades as carbon source and preparation method of fluorescent carbon quantum dot

A carbon quantum dot and fluorescence quantum yield technology, which is applied in the preparation of fluorescent carbon quantum dots and the field of fluorescent carbon quantum dots, can solve the problems of few fluorescent active sites and low yield of carbon quantum dots, and achieve good biocompatibility. High performance, strong fluorescence, simple method

Inactive Publication Date: 2018-05-29
兴义民族师范学院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The hydrothermal method has the advantages of low cost, high yield, and simple post-treatment. It has been widely used in the field of carbon quantum dot preparation, but its carbon quantum dots have few fluorescent active sites and low yield (mostly less than 15%) , selectivity, etc. become the bottleneck of development

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  • Fluorescent carbon quantum dot with magnolia alba leaf blades as carbon source and preparation method of fluorescent carbon quantum dot
  • Fluorescent carbon quantum dot with magnolia alba leaf blades as carbon source and preparation method of fluorescent carbon quantum dot
  • Fluorescent carbon quantum dot with magnolia alba leaf blades as carbon source and preparation method of fluorescent carbon quantum dot

Examples

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Embodiment 1

[0023] A preparation method of novel fluorescent carbon quantum dots using white orchid leaves as a carbon source, comprising the following steps:

[0024] (1) Dissolve 0.50 g of white orchid leaf powder in 30 mL of deionized water to a concentration of 0.017 g / mL, ultrasonically oscillate for 20 min, and react at 180 °C for 4 h by hydrothermal method to obtain fluorescent carbon quantum dot solution;

[0025] (2) Ultracentrifuge the fluorescent carbon quantum dot solution at 6000 r / min for 10 min, then filter it with an aqueous syringe filter, and take the supernatant to obtain the fluorescent carbon quantum dot solution. Using single-photon technology to measure the fluorescence retention time of carbon quantum dots, the average fluorescence lifetime is calculated to be 4.38 ns, and quinine sulfate (Q Y =54.0%) as a reference, the fluorescent carbon quantum dot solution with a fluorescence quantum yield of 8.3%.

Embodiment 2

[0027] A preparation method of novel fluorescent carbon quantum dots using white orchid leaves as a carbon source, comprising the following steps:

[0028] (1) Dissolve 1.50 g of white orchid leaf powder in 30 mL of deionized water to a concentration of 0.050 g / mL, ultrasonically oscillate for 30 min, and react at 200 °C for 16 h by hydrothermal method to obtain fluorescent carbon quantum dot solution;

[0029] (2) The fluorescent carbon quantum dot solution was ultracentrifuged at 8000 r / min for 30 min, and then filtered with a 0.22 μm aqueous syringe filter. Using single-photon technology to measure the fluorescence retention time of carbon quantum dots, the average fluorescence lifetime is calculated to be 4.38 ns, and quinine sulfate (Q Y =54.0%) as a reference, the fluorescent carbon quantum dot solution with a fluorescence quantum yield of 13.8%.

Embodiment 3

[0031] A preparation method of novel fluorescent carbon quantum dots using white orchid leaves as a carbon source, comprising the following steps:

[0032] (1) Dissolve 2.00 g of white orchid leaf powder in 30 mL of deionized water to a concentration of 0.067 g / mL, ultrasonically oscillate for 30 min, and react at 220 °C for 24 h by hydrothermal method to obtain fluorescent carbon quantum dot solution;

[0033] (2) The fluorescent carbon quantum dot solution was ultracentrifuged at 16000 r / min for 30 min, and then filtered with a 0.22 μm aqueous syringe filter. The fluorescence retention time of carbon quantum dots was measured by single-photon technology, and the average fluorescence lifetime was 4.38 ns. Y =54.0%) as a reference, the fluorescent carbon quantum dot solution with a fluorescence quantum yield of 11.4%.

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Abstract

The invention discloses a fluorescent carbon quantum dot with magnolia alba leaf blades as a carbon source and a preparation method of the fluorescent carbon quantum dot. The yield of fluorescent quantum is 8.3 to 13.8 percent. The preparation method comprises the following steps: dissolving 0.50 to 2.00g of magnolia alba leaf blade powder into 30mL of deionized water and enabling the concentration of the magnolia alba leaf blade powder to be 0.017 to 0.067g / mL; carrying out ultrasonic concussion for 10 to 40 minutes; then reacting at the temperature of 140 to 220 DEG C for 4 to 24 hours by adopting a hydrothermal method to obtain a fluorescent carbon quantum dot solution; carrying out ultrasonic concussion on the fluorescent carbon quantum dot solution for 10 to 40 minutes, and carrying out supercentrifugation at the speed of 4000 to 16000r / min for 10 to 40 minutes; then filtering by using an aqueous phase needle cylinder type filter, and taking supernate to obtain the fluorescent carbon quantum dot solution. The fluorescent carbon quantum dot disclosed by the invention has the advantages of high fluorescence quantum yield, simple preparation, low toxicity, good biocompatibility and water solubility and small particle size.

Description

technical field [0001] The invention belongs to the technical field of carbon nanomaterials, and specifically relates to a fluorescent carbon quantum dot using white orchid leaves as a carbon source, and also relates to a preparation method for the fluorescent carbon quantum dots using white orchid leaves as a carbon source. Background technique [0002] Carbon quantum dots are a class of spherical easily dispersible carbon nanomaterials with a size less than 10 nm, which can act as electron donors or acceptors to generate photoinduced charge transfer. Compared with traditional fluorescent dyes, carbon quantum dots overcome the shortcomings of fluorescent dyes such as narrow excitation range, half-width and asymmetry of emission spectrum, optical instability, and high toxicity; carbon quantum dots also have low toxicity and biocompatibility. Compared with metal nanoparticles, carbon quantum dots have the advantages of high fluorescence intensity, small particle size, and e...

Claims

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Application Information

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IPC IPC(8): C09K11/65C01B32/15B82Y20/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y40/00C01P2004/64C01P2006/60C09K11/65G01N21/643G01N21/6486G01N2021/6432
Inventor 张仟春钟捷武王苑王兴益吴韵徐新然吴金城张丽
Owner 兴义民族师范学院
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