Aluminum functionalized fluorescent carbon dot and preparation method and application thereof

Abstract

The invention discloses an aluminum functionalized fluorescent carbon dot and a preparation method and application thereof, a polyhydroxy and polycarboxyl compound and a nitrogen-containing compound are used as precursors of carbon, an aluminum salt is used as a modifier, a reaction raw material aqueous solution is heated by one-step microwave until a solvent is completely evaporated to dryness, and the surface aluminum functionalized fluorescent carbon dot is prepared. The aluminum functionalized fluorescent carbon dot provided by the invention can emit bright green fluorescence without any dispersion matrix under excitation from ultraviolet to blue light bands, and has the advantages of high quality yield and fluorescence quantum efficiency, good light stability, simple and rapid synthesis method, environment-friendly preparation process and the like.

Description

technical field

[0001] The invention relates to the technical field of carbon dots, in particular to an aluminum-functionalized fluorescent carbon dot and its preparation method and application. Background technique

[0002] Carbon dots (CDs) are an emerging quasi-zero-dimensional luminescent carbon nanomaterials, which are regarded as organic dyes and semiconductors due to their good chemical stability, photostability, water solubility and excellent biocompatibility. A potential replacement for quantum dots. Based on the above advantages, carbon dot phosphors have broad application prospects in the fields of biolabeling, biosensing, photocatalysis, light-emitting devices, and bioimaging. At present, carbon dot phosphors have achieved high-efficiency luminescence in blue and green light bands, and their solid-state fluorescence quantum efficiency has reached more than 60%.

[0003] In recent years, carbon dots, as a solid-state phosphor, have been applied in light-emitting...

Examples

preparation example Construction

[0058] Specifically, the preparation method of the above aluminum-functionalized fluorescent carbon dots includes the following steps:

[0059] S1. Dissolving citric acid compound, urea, and aluminum salt in water, mixing them into a uniform colorless and transparent solution, and then placing it in a household microwave oven to heat and react;

[0060] S2. Grinding the solid product obtained from the reaction in S1 into powder with an agate mortar in a glove box and packaging it to obtain a solid green luminescent carbon dot phosphor;

[0061] The aluminum salt selected in step S1 is aluminum chloride hexahydrate to prevent the severe hydrolysis of aluminum chloride in water, and the citric acid is anhydrous citric acid or citric acid monohydrate.

[0062] The microwave oven used for the reaction in step S1 is a domestic microwave oven with a power of 650W, a reaction temperature of about 100-200°C, and a reaction time of -3min, until the solvent is completely evaporated to o...

Embodiment 1

[0068] The solid-state luminescent carbon-dot fluorescent powder is prepared by using citric acid, urea and aluminum chloride as raw materials through a one-step microwave heating method.

[0069] The preparation method of the above-mentioned solid-state luminescent carbon dot phosphor comprises the following steps:

[0070] S1. Dissolve 1.5g of citric acid monohydrate, 3g of urea and 2g of aluminum chloride hexahydrate in 10ml of ultrapure water to obtain a uniform colorless and transparent solution, then place it in a 650W household microwave oven, and heat it on medium heat for 3 minutes until all the liquid evaporates. Dry;

[0071] S2. Quickly transfer the solid product reacted in S1 to the glove box while hot, scrape the product out with a medicine spoon, and thoroughly grind the product into a fine powder with a mortar to obtain an aluminum-functionalized solid-state luminescent carbon dot phosphor.

[0072] The schematic diagram of the structure of the above-mentioned...

Embodiment 2

[0079] The reaction conditions were the same as in Example 1, except that the amount of raw materials used was 1.5 g of citric acid monohydrate, 1 g of urea and 1 g of aluminum chloride hexahydrate.

technical field

[0001] The invention relates to the technical field of carbon dots, in particular to an aluminum-functionalized fluorescent carbon dot and its preparation method and application. Background technique

[0002] Carbon dots (CDs) are an emerging quasi-zero-dimensional luminescent carbon nanomaterials, which are regarded as organic dyes and semiconductors due to their good chemical stability, photostability, water solubility and excellent biocompatibility. A potential replacement for quantum dots. Based on the above advantages, carbon dot phosphors have broad application prospects in the fields of biolabeling, biosensing, photocatalysis, light-emitting devices, and bioimaging. At present, carbon dot phosphors have achieved high-efficiency luminescence in blue and green light bands, and their solid-state fluorescence quantum efficiency has reached more than 60%.

[0003] In recent years, carbon dots, as a solid-state phosphor, have been applied in light-emitting...

Examples

preparation example Construction

[0058] Specifically, the preparation method of the above aluminum-functionalized fluorescent carbon dots includes the following steps:

[0059] S1. Dissolving citric acid compound, urea, and aluminum salt in water, mixing them into a uniform colorless and transparent solution, and then placing it in a household microwave oven to heat and react;

[0060] S2. Grinding the solid product obtained from the reaction in S1 into powder with an agate mortar in a glove box and packaging it to obtain a solid green luminescent carbon dot phosphor;

[0061] The aluminum salt selected in step S1 is aluminum chloride hexahydrate to prevent the severe hydrolysis of aluminum chloride in water, and the citric acid is anhydrous citric acid or citric acid monohydrate.

[0062] The microwave oven used for the reaction in step S1 is a domestic microwave oven with a power of 650W, a reaction temperature of about 100-200°C, and a reaction time of -3min, until the solvent is completely evaporated to o...

Embodiment 1

[0068] The solid-state luminescent carbon-dot fluorescent powder is prepared by using citric acid, urea and aluminum chloride as raw materials through a one-step microwave heating method.

[0069] The preparation method of the above-mentioned solid-state luminescent carbon dot phosphor comprises the following steps:

[0070] S1. Dissolve 1.5g of citric acid monohydrate, 3g of urea and 2g of aluminum chloride hexahydrate in 10ml of ultrapure water to obtain a uniform colorless and transparent solution, then place it in a 650W household microwave oven, and heat it on medium heat for 3 minutes until all the liquid evaporates. Dry;

[0071] S2. Quickly transfer the solid product reacted in S1 to the glove box while hot, scrape the product out with a medicine spoon, and thoroughly grind the product into a fine powder with a mortar to obtain an aluminum-functionalized solid-state luminescent carbon dot phosphor.

[0072] The schematic diagram of the structure of the above-mentioned...

Embodiment 2

[0079] The reaction conditions were the same as in Example 1, except that the amount of raw materials used was 1.5 g of citric acid monohydrate, 1 g of urea and 1 g of aluminum chloride hexahydrate.

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