Preparation method of silicon dioxide coated fluorescent carbon quantum dot composite microspheres

A technology of carbon quantum dots and composite microspheres, which is applied in the field of preparation of silica-wrapped fluorescent carbon quantum dot composite microspheres, can solve the problems of poor luminescence stability and short service life of carbon quantum dots, and achieve improved luminescence stability and The effect of service life, low equipment requirements, and simple steps

Inactive Publication Date: 2020-09-08
QINGDAO UNIV OF SCI & TECH
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Problems solved by technology

[0005] Aiming at the disadvantages of existing carbon quantum dots such as poor luminescence stability and short service life, the present invention provides a preparation method of silica-wrapped fluorescent carbon quantum dot composite microspheres, which can be simply improved Methods The technology for preparing silica microspheres is replaced by ethanol solution of carbon quantum dots The anhydrous ethanol in the method, promptly utilizes fluorescent carbon quantum dot ethanol dispersion system to rep

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  • Preparation method of silicon dioxide coated fluorescent carbon quantum dot composite microspheres
  • Preparation method of silicon dioxide coated fluorescent carbon quantum dot composite microspheres
  • Preparation method of silicon dioxide coated fluorescent carbon quantum dot composite microspheres

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Embodiment 1

[0036] The method for preparing silica-coated fluorescent carbon quantum dot composite microspheres according to embodiment 1 of the present invention includes the following steps:

[0037] a. Using L-cystine as a raw material to prepare carbon quantum dots in the water phase:

[0038] Dissolve 1.0g of L-cystine in 10mL of 0.95mol / L NaOH solution, place it in a single-mode microwave reactor, react for 5s at 135°C, cool quickly, and prepare green-emitting carbon quantum dots in the water phase .

[0039] b. The transfer of carbon quantum dots in the water phase to the organic solvent:

[0040] Add 10 mL of dichloromethane to the aqueous solution of carbon quantum dots, stir and extract for 24 hours at 800 rpm at room temperature, transfer the carbon quantum dots to the dichloromethane phase, separate the dichloromethane phase, and obtain the carbon quantum dispersed in dichloromethane point. After the carbon quantum dots that emit green light in the water phase are transferred to the...

Embodiment 2

[0051] The method for preparing silica-coated fluorescent carbon quantum dot composite microspheres according to Embodiment 2 of the present invention includes the following steps:

[0052] a. Using o-phenylenediamine as a raw material to prepare carbon quantum dots in the water phase:

[0053] 0.4 g of o-phenylenediamine was dissolved in 20 mL of deionized water, placed in a single-mode microwave reactor, and reacted at 135° C. for 8 minutes, and then rapidly cooled to obtain yellow-emitting carbon quantum dots in the water phase.

[0054] b. The transfer of carbon quantum dots in the water phase to the organic solvent:

[0055] Add 20mL of dichloromethane to the aqueous solution of carbon quantum dots, stir and extract for 24h at 800 rpm at room temperature, transfer the carbon quantum dots to the dichloromethane phase, separate the dichloromethane phase, and obtain the carbon quantum dispersed in dichloromethane point. The carbon quantum dots dispersed in the methylene chloride ph...

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Abstract

The invention belongs to the technical field of luminescent materials, and particularly relates to a preparation method of silicon dioxide coated fluorescent carbon quantum dot composite microspheres.The method comprises the following steps: preparing carbon quantum dots by using a microwave reactor through a hydrothermal method, transferring the carbon quantum dots into an organic solvent through an extraction method, then adding ethanol, dispersing the carbon quantum dots into the ethanol solvent through solvent replacement, finally, adding carbon quantum dots in hydrolysis reaction of tetraethoxysilane under ammonia-alkali conditions, and coating the carbon quantum dots in situ in the growth process of silicon dioxide to obtain the silicon dioxide coated carbon quantum dot fluorescentcomposite microsphere. The preparation method is energy-saving, rapid, efficient and high in quantum dot coating rate, and the prepared fluorescent composite microsphere is regular in shape, uniform and adjustable in particle size, good in light-emitting stability and long in service life.

Description

Technical field [0001] The invention belongs to the technical field of luminescent materials, and specifically relates to a method for preparing silica-coated fluorescent carbon quantum dot composite microspheres. Background technique [0002] Carbon quantum dots (CQDs) are a class of spherical nanoparticles with a size less than 10nm, which are composed of sp 2 Carbon core and surface functional groups. Compared with traditional organic dyes and quantum dots, carbon quantum dots have unique optical properties, good biocompatibility, low toxicity, resistance to photobleaching, and chemical and physical inertness. Since the discovery of carbon quantum dots in 2004, researchers have made great progress in their applications in bioimaging, biosensing, drug delivery, and light-emitting devices. [0003] In recent years, people have developed a series of methods for preparing carbon quantum dots, which can adjust the emission wavelength of fluorescent carbon quantum dots by adjusting t...

Claims

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Application Information

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IPC IPC(8): C09K11/65C09K11/02B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/025C09K11/65
Inventor 李东祥祝婕吴春兴李春芳王雨
Owner QINGDAO UNIV OF SCI & TECH
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