Multi-optical-performance carbon dot as well as preparation method and application thereof

A technology of optical properties and carbon dots, which is applied in the field of carbon-based nano-luminescent materials preparation, can solve the problems of powder fluorescence quenching, single optical properties of carbon dots, and difficult preparation of carbon dots, so as to expand production and preparation, save energy and time in the preparation process Effect

Active Publication Date: 2021-11-30
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing preparation of carbon dots usually encounters the following problems: 1) the emission of carbon dots is generally in the red and green light region; 2) the fluorescence of carbon dots will be greatly quenched when they are dried into powder; 3) it is difficult to...

Method used

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  • Multi-optical-performance carbon dot as well as preparation method and application thereof
  • Multi-optical-performance carbon dot as well as preparation method and application thereof
  • Multi-optical-performance carbon dot as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1: Weigh 0.54 g of flaky 1,2-phenylenediamine and 0.08 g of aluminum chloride hexahydrate, place them in an agate mortar, and grind them thoroughly for 15 minutes to obtain a mixed powder.

[0033] Step 2: Transfer the mixed powder to a 25 mL reaction kettle.

[0034] Step 3: Put the hydrothermal reaction kettle in an oven and react at 200°C for 12 h.

[0035] Step 4: Naturally cool to room temperature, take out the reactor, and obtain a light gray solid powder.

[0036] Step 5: The above-mentioned solid carbon dots emit blue fluorescence under a 365 nm ultraviolet lamp, and there is a short yellow afterglow when the light source is turned off. Its fluorescence quantum yield is 3.2%, and its phosphorescent quantum yield is 2.8%.

[0037] see figure 1 , the carbon dot structure appears in a, and the particle size distribution is mainly in the range of 4~10nm. The 0.21 nm lattice fringe of carbon dots in b corresponds to the 100 crystal plane of graphene, which p...

Embodiment 2

[0042] Step 1: Weigh 15 g of flaky 1,2-phenylenediamine and 1.6 g of aluminum chloride hexahydrate, place them in an agate mortar, and grind them thoroughly for 20 minutes to obtain a mixed powder.

[0043] Step 2: Transfer the mixed powder to a 100 mL reactor.

[0044] Step 3: Put the hydrothermal reaction kettle in an oven and react at 220°C for 4 h.

[0045] Step 4: Cool naturally to room temperature, and take out the reactor. A light gray solid powder was obtained.

[0046] Step 5: The above-mentioned solid carbon dots emit blue fluorescence under a 365 nm ultraviolet lamp, and there is a short yellow afterglow when the light source is turned off.

Embodiment 3

[0048]Step 1: Weigh 15 g of flaky 1,2-phenylenediamine and 1.6 g of aluminum chloride hexahydrate, place them in an agate mortar, and grind them thoroughly for 20 minutes to obtain a mixed powder.

[0049] Step 2: Transfer the mixed powder to a 100 mL reactor.

[0050] Step 3: Put the hydrothermal reaction kettle in an oven and react at 220°C for 12 h.

[0051] Step 4: Cool naturally to room temperature, and take out the reactor. A light gray solid powder was obtained.

[0052] Step 5: The above-mentioned solid carbon dots emit blue fluorescence under a 365 nm ultraviolet lamp, and there is a short yellow afterglow when the light source is turned off.

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Abstract

The invention discloses a multi-optical-performance carbon dot and a preparation method and application thereof. The carbon dot comprises a core state used for emitting blue light and a surface state distributed on the surface of the core state and used for emitting red light. According to the invention, 1,2-phenylenediamine serves as a carbon and nitrogen source, aluminum chloride hexahydrate serves as a catalyst, and an in-situ solvent-free catalysis-aided heating strategy is used so as to synthesize the light gray solid carbon dot; the light gray solid carbon dot emits blue fluorescence under excitation of 365-nm ultraviolet light, and yellow phosphorescence is displayed after an excitation light source is extinguished; and the light gray quantum dot is dissolved in a dimethyl sulfoxide or N,N-dimethylformamide solvent, the fluorescence of the formed solution changes from blue to red, and near-infrared emission is achieved. The raw materials and the catalyst used for preparing the carbon dot are cheap and easy to obtain, tedious pretreatment and purification processes are not needed, the preparation process is energy-saving and time-saving, production and preparation can be expanded, and the dot has industrial application prospects.

Description

technical field [0001] The invention belongs to the preparation of carbon-based nano-luminescent materials, and in particular relates to a carbon dot with multiple optical properties, a preparation method and an application. Background technique [0002] Carbon dots are generally defined as zero-dimensional spherical carbon nanoparticles with a particle size of less than 10 nm. Carbon dots are prepared from a wide range of raw materials, simple preparation methods, good optical stability, rich surface groups, and low toxicity of carbon-based materials. It also has unique properties such as optical tunability, photobleaching resistance, good water solubility and biocompatibility. However, the existing preparation of carbon dots usually encounters the following problems: 1) the emission of carbon dots is generally in the red and green light region; 2) the fluorescence of carbon dots will be greatly quenched when they are dried into powder; 3) it is difficult to prepare phospho...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y40/00C01B32/184
CPCC09K11/65B82Y20/00B82Y40/00C01B32/184
Inventor 任丽丽白建良
Owner SOUTHEAST UNIV
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