Multicolor luminous carbon quantum dot as well as preparation method and application thereof

A carbon quantum dot and mass ratio technology, applied in the field of multi-color luminescent carbon quantum dots and their preparation, can solve the problems of difficult separation operation, rare preparation of controllable multi-color carbon quantum dots, complicated equipment requirements, etc. The effect of short time, high yield, easy operation and separation

Active Publication Date: 2019-01-18
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on the preparation of controllable multicolor carbon quantum dots
And there are many problems such as difficult separation, complicated operation or high equipment requirements

Method used

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  • Multicolor luminous carbon quantum dot as well as preparation method and application thereof
  • Multicolor luminous carbon quantum dot as well as preparation method and application thereof
  • Multicolor luminous carbon quantum dot as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment provides a method for preparing multicolor luminescent carbon quantum dots, the method comprising steps:

[0033] Dissolve 3g of citric acid, 3g of oxalic acid and 3g of urea in 24ml of deionized water and mix it with 3g of polyethylene glycol, place it in a hydrothermal reaction kettle and tighten it, place the hydrothermal reaction kettle in an oven and heat it to 180°C, keep the temperature constant After reacting for 4 hours, let it cool down to room temperature, take out the obtained solution, add deionized water and pour it into the centrifuge, adjust the centrifuge speed to 4000r / min, set the time to 10min, centrifuge three times to obtain the centrifugal precipitate, and then The centrifuged precipitate obtained was mixed with ethanol and then centrifuged again three times. The obtained upper liquid was dried in a vacuum oven at 60°C for 60 minutes to obtain carbon quantum dots with an emission peak at 525nm and yellow-green light. The obtained pr...

Embodiment 2

[0036] This embodiment provides a method for preparing multicolor luminescent carbon quantum dots, the method comprising steps:

[0037] Dissolve 3g of citric acid and 6g of urea in 36ml of water and mix it with 15g of polyethylene glycol, then put it in a hydrothermal reaction kettle and tighten it, put the hydrothermal reaction kettle in an oven and heat it to 200°C, react at a constant temperature for 12 hours and then let it stand Cool to room temperature, take out the obtained solution, add deionized water and pour it into the centrifuge, adjust the speed of the centrifuge to 4000r / min, set the time to 10min, centrifuge three times and separate to obtain the centrifugal precipitate, and then the obtained centrifugal precipitate After adding ethanol and mixing evenly, centrifuge again three times. The obtained upper liquid was dried in a vacuum oven at 60°C for 60 minutes to obtain yellow-green light emitting carbon quantum dots. The obtained precipitate was air-dried under...

Embodiment 3

[0039] This embodiment provides a method for preparing multicolor luminescent carbon quantum dots, the method comprising steps:

[0040] Dissolve 3g of citric acid, 6g of oxalic acid and 6g of urea in 30ml of deionized water and mix it with 30g of polyethylene glycol, then place it in a hydrothermal reaction kettle and tighten it. Put the hydrothermal reaction kettle in an oven and heat it to 120°C. After reacting for 8 hours, let it cool down to room temperature, take out the obtained solution, add deionized water and pour it into the centrifuge, adjust the centrifuge speed to 4000r / min, set the time to 10min, centrifuge three times to obtain the centrifugal precipitate, and then The centrifuged precipitate obtained was mixed with ethanol and then centrifuged again three times. The obtained upper liquid was dried in a vacuum oven at 50°C for 60 minutes to obtain carbon quantum dots emitting yellow-green light. The obtained precipitate was air-dried under natural conditions to ...

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Abstract

The invention belongs to the technical field of a nanometer luminous material, and discloses a multicolor luminous carbon quantum dot as well as a preparation method and application thereof. The method comprises the following steps that citric acid, oxalic acid and urea are dissolved in water; the mixture is mixed with polyethylene glycol, and is then put into a hydrothermal reaction kettle; the hydrothermal reaction kettle is put into a drying box to be heated to be any one temperature between 120 DEG C to 200 DEG C; constant temperature reaction is performed for 4h to 12h; then, stilling standing and cooling are performed to room temperature; the obtained solution is centrifugally separated to obtain a centrifugal precipitate; then, the obtained centrifugal precipitate is added into ethyl alcohol to be uniformly mixed; then, secondary centrifugation is performed; obtained supernatant liquid is dried in a vacuum drying box; yellow and green carbon quantum dots are obtained; the obtained precipitates are dried in air under the natural condition; the blue light giving carbon quantum dot is obtained. The process of the preparation method is simple; the reaction time is short; the yield is relatively high; the particle diameter is small; the environment-friendly effect is achieved; the obtained carbon quantum dot has the advantages of luminous stability, low toxicity and the like.

Description

technical field [0001] The invention relates to the technical field of nano-luminescent materials, in particular to a multicolor luminescent carbon quantum dot and its preparation method and application. Background technique [0002] Carbon quantum dots, also known as nano-carbon dot materials, have attracted the attention of scholars in the industry since their discovery. Nano-carbon dot material is a zero-dimensional material, that is, it exhibits zero-dimensionality on three-dimensional scales. Due to the particularity of its size, it exhibits excellent performance in many aspects, especially in terms of luminescence performance. There have been many reports on the application of carbon quantum dots in biomedicine, light-emitting devices, solar cells, and photocatalysis. At present, the methods for preparing carbon quantum dots are mainly divided into two categories: top-down method and bottom-up method. The top-down methods mainly include ball milling or grinding, repe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/65
Inventor 宿世臣李东颖凌志聪
Owner SOUTH CHINA NORMAL UNIVERSITY
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