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Plant-source environment-friendly fluorescent carbon quantum dots as well as preparation method and application of plant-source environment-friendly fluorescent carbon quantum dots

A technology of carbon quantum dots and fluorescent quantum yield, applied in the direction of fluorescence/phosphorescence, chemical instruments and methods, nano-carbon, etc., can solve the problems of low yield and few fluorescent active sites of carbon quantum dots, and achieve low biological toxicity , good imaging effect, good biocompatibility effect

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

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Problems solved by technology

Therefore, the hydrothermal method is widely used in the preparation of fluorescent carbon quantum dots, but the carbon quantum dots have fewer fluorescent active sites, low yield (mostly less than 15%), and selectivity have become the bottleneck of development.

Method used

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  • Plant-source environment-friendly fluorescent carbon quantum dots as well as preparation method and application of plant-source environment-friendly fluorescent carbon quantum dots
  • Plant-source environment-friendly fluorescent carbon quantum dots as well as preparation method and application of plant-source environment-friendly fluorescent carbon quantum dots
  • Plant-source environment-friendly fluorescent carbon quantum dots as well as preparation method and application of plant-source environment-friendly fluorescent carbon quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for preparing plant-derived nontoxic and environmentally friendly fluorescent carbon quantum dots, comprising the following steps:

[0016] (1) Select mature fresh fruit of seedless Rosa roxburghii, wash it thoroughly with distilled water, remove the fruit stem and persistent calyx for later use;

[0017] (2) Mix the deionized water and Rosa roxburghii in a mass ratio of 3, and place them in a blender to grind them thoroughly to obtain a homogenate. Weigh 20.0 g of the homogenate, place it in a 100 ml reactor liner, and vibrate ultrasonically for 5 min to fully disperse the material in the homogenate. Then, the hydrothermal method was used to react at 140 °C for 8 h to obtain a preliminary fluorescent carbon quantum dot solution;

[0018] The preliminary fluorescent carbon quantum dot solution was ultracentrifuged at 12000 r / min for 10 min, the supernatant was filtered with a syringe filter, and the supernatant was taken to obtain the fluorescent carbon quantu...

Embodiment 2

[0020] A method for preparing plant-derived nontoxic and environmentally friendly fluorescent carbon quantum dots, comprising the following steps:

[0021] (1) Select mature fresh fruit of seedless Rosa roxburghii, wash it thoroughly with distilled water, remove the fruit stem and persistent calyx for later use;

[0022] (2) Mix the deionized water and Rosa roxburghii at a mass ratio of 0.5, and place them in a blender to grind them sufficiently to obtain a homogenate. Weigh 70.0 g of the homogenate, place it in a 100 ml reactor liner, and vibrate ultrasonically for 10 min to fully disperse the material in the homogenate. Then, the hydrothermal method was used to react at 200 °C for 24 h to obtain a preliminary fluorescent carbon quantum dot solution;

[0023] The preliminary fluorescent carbon quantum dot solution was ultracentrifuged at 20,000 r / min for 30 min, and the supernatant was filtered with a syringe filter, and the fluorescence retention time of carbon quantum dots...

Embodiment 3

[0025] A method for preparing plant-derived nontoxic and environmentally friendly fluorescent carbon quantum dots, comprising the following steps:

[0026] (1) Select mature fresh fruit of seedless Rosa roxburghii, wash it thoroughly with distilled water, remove the fruit stem and persistent calyx for later use;

[0027] (2) Mix the deionized water and Rosa roxburghii at a mass ratio of 0.8, and place them in a blender to grind them sufficiently to obtain a homogenate. Weigh 56.00 g of the homogenate, place it in a 100 ml reactor liner, and vibrate ultrasonically for 10 min to fully disperse the material in the homogenate. Then, the hydrothermal method was used to react at 220 °C for 12 h to obtain a preliminary fluorescent carbon quantum dot solution;

[0028] The preliminary fluorescent carbon quantum dot solution was ultracentrifuged at 18,000 r / min for 30 min, and the supernatant was filtered with a syringe filter, and the fluorescence retention time of carbon quantum dot...

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Abstract

The invention discloses plant-source environment-friendly fluorescent carbon quantum dots as well as a preparation method and application of the plant-source environment-friendly fluorescent carbon quantum dots. The preparation method comprises the following steps: mixing deionized water with rosa sterilis according to a mass ratio of 0.5 to 3 to obtain a mixture; adding the mixture into a stirring machine to be fully ground to obtain homogenate; weighing 20.0 to 70.0g of homogenate; putting the homogenate into an inner tank of a 100ml reaction kettle for performing ultrasonic oscillation for5 to 20 minutes to ensure that substances in the homogenate are fully dispersed; performing reaction for 8 to 24 hours at 140 to 220 DEG C by adopting a hydrothermal method to obtain a primary carbonspot solution; performing ultracentrifugation on the primary carbon spot solution for 10 to 30 minutes at the speed of 12000 to 20000r / min; filtering supernatant liquid by adopting a syringe type filter to obtain a carbon spot solution. The plant-source environment-friendly fluorescent carbon quantum dots disclosed by the invention have the advantages that the average fluorescent service life is 4.36ns, the fluorescent quantum yield is 15.0 to 24.8 percent and the fluorescent quantum yield is high; preparation conditions are simple and environmentally friendly, plants are used as carbon sources, the biocompatibility is good and the plant-source environment-friendly fluorescent carbon quantum dots are low in toxicity.

Description

technical field [0001] The invention belongs to the technical field of carbon nanomaterials, and specifically relates to a plant-sourced environmentally friendly fluorescent carbon quantum dot, and also relates to a preparation method of the plant-sourced environmentally friendly fluorescent carbon quantum dot, and the imaging of the plant-sourced environmentally friendly fluorescent carbon quantum dot in cervical cancer cells in the application. Background technique [0002] Carbon quantum dots are spherical fluorescent carbon nanomaterials with good dispersion and high stability developed in recent years. It is mainly composed of Ⅱ-Ⅵ or Ⅲ-Ⅴ group elements with a size of 1-10 nm. In ultraviolet, visible light and near-infrared light, carbon quantum dots can realize fluorescence excitation through single-photon and two-photon absorption. Donating electrons or accepting electrons produces photoinduced charge transfer. It also has the advantages of biocompatibility, low toxi...

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 张仟春付予锦王苑吴韵王兴益徐新然吴金城张丽
Owner 兴义民族师范学院
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