Preparation method of fluorescent carbon quantum dots

A technology of carbon quantum dots and fluorescence, which is applied in the field of preparation of fluorescent carbon quantum dots, can solve the problems of poor particle size uniformity, wide particle size range, and increased production costs of carbon quantum dots, and achieve stable fluorescence energy, uniform particle size, and convenient operation. Effect

Active Publication Date: 2015-08-05
NANJING TECH UNIV
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Problems solved by technology

Although the process of this method is relatively simple, it requires pretreatment of raw materials, and the freeze-drying step increases the production cost
In addition, the particle size uniformity of the carbon quantum dots prepared in the examples is poor, and the particle size range is wide, about 3-12 μm

Method used

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  • Preparation method of fluorescent carbon quantum dots
  • Preparation method of fluorescent carbon quantum dots
  • Preparation method of fluorescent carbon quantum dots

Examples

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Embodiment Construction

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and examples. However, the invention is not limited to the examples given.

[0029] The steps for preparing fluorescent carbon quantum dots in this embodiment are as follows:

[0030] The first step is to collect plant leaves, wash and dry them;

[0031] The plant leaves are elliptical camphor leaves, or heart-shaped sweet potato leaves, or morning glory leaves, or palm-shaped sycamore leaves, or fan-shaped ginkgo leaves, or lanceolate leaves. Peach leaves, willow leaves, or bamboo leaves, or round lotus leaves, or lotus leaves, or needle-shaped pine needles, or diamond-, scale-, spoon-, or triangular blades.

[0032] The second step, the blade obtained in the first step is placed in a quartz boat (the diameter of the quartz boat is 2cm, the height is 1cm, and the length is 8cm), then the quartz boat is placed in the quartz tube of the tube furnace, and is passe...

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Abstract

The invention relates to a preparation method of fluorescence carbon quantum dots. The preparation method comprises the following steps: a first step, collecting plant leaves, washing the leaves and drying the leaves in the air; a second step, burning the clean leaves to obtain a black solid; a third step, grinding the black solid into a powder, and dispersing the powder in a solvent to obtain a well dispersed suspension through magnetic stirring and ultrasonic treatment; a fourth step, centrifuging the suspension or carrying on a separating process using a filter membrane, removing precipitation to obtain a clear solution; and a fifth step, removing the solvent in the clear solution, then obtaining the solid of the fluorescence carbon quantum dots. According to the invention, a variety of the plant leaves can be employed as raw materials, sources of the raw materials are wide and preparation processes of the method are simple and easy.

Description

technical field [0001] The invention relates to a method for preparing fluorescent carbon quantum dots, in particular to a method for preparing fluorescent carbon quantum dots from plant leaves. Background technique [0002] Due to their excellent optical and electrical properties, fluorescent nanoparticles have broad application prospects in the fields of biomedicine and optoelectronic devices. Recently, researchers have found that typical fluorescent nanoparticles, such as CdTe, CdSe, PbS and other semiconductor quantum dot materials, contain heavy metal elements, which not only have toxic side effects on organisms, but also cause serious pollution to the environment, which greatly limits the use of such materials. Applications of quantum dots in the fields of biology and environmental protection. [0003] Carbon quantum dots are a new type of carbon material discovered in 2004. Compared with traditional semiconductor quantum dots and organic dyes, this new member of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02C09K11/65B82Y40/00B82Y20/00C01B32/15
Inventor 陈苏朱亮亮王彩凤
Owner NANJING TECH UNIV
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