Cheap preparation method of yellow emission carbon quantum dots

A carbon quantum dot and cheap technology, which is applied in the field of cheap preparation of yellow light-emitting carbon quantum dots, can solve the problems of lack of cheap preparation methods for long-wave emission carbon quantum dots, and achieve the effect of simple and feasible preparation methods, low raw materials, and low price

Inactive Publication Date: 2016-11-16
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem of the lack of cheap preparation methods for long-wave emitting carbon quantum dots in the existing field of

Method used

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  • Cheap preparation method of yellow emission carbon quantum dots
  • Cheap preparation method of yellow emission carbon quantum dots
  • Cheap preparation method of yellow emission carbon quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 50 mg of fullerene charcoal ash in a 50 mL round bottom flask, put it into a beaker filled with ice water, and mix 8 mL of concentrated nitric acid / concentrated sulfuric acid mixture (volume ratio of 1: 3) Slowly add it dropwise to the round bottom flask, and continue stirring for 30 min after adding the acid dropwise. Stop stirring, sonicate for 2 h, place the round bottom flask in an oil bath, and heat at 100 °C for 24 h. After the sample was naturally cooled to room temperature, it was placed in ice water again, and 25 mL of deionized water was slowly added dropwise under stirring, and K 2 CO 3 Neutralize to pH>7, centrifuge (12500 rpm, 30 min), remove the precipitate, transfer the supernatant to a 100 Da dialysis bag, dialyze for 3-6 days, discard the dialysate, and transfer the liquid in the bag to 500 Da In the Da dialysis bag, continue dialysis for 3 to 6 days, retain and concentrate the dialysate, then transfer the liquid in the bag to 1000 Da and 2000 Da...

Embodiment 2

[0031]On the basis of Example 1, the volume of the concentrated nitric acid / concentrated sulfuric acid mixture (volume ratio 1:3) was adjusted to 4 mL, and other conditions remained unchanged.

Embodiment 3

[0033] On the basis of Example 2, the volume ratio of concentrated nitric acid to concentrated sulfuric acid was adjusted to 1:2, and other conditions remained unchanged.

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Abstract

The invention discloses a cheap preparation method of a class of yellow light-emitting carbon quantum dots. The preparation steps are as follows: using charcoal ashes produced by the industrial production of fullerenes as a raw material, adding concentrated sulfuric acid and concentrated nitric acid, ultrasonic treatment, and obtaining a dispersion liquid; The dispersion was heated in an oil bath, cooled to room temperature, diluted with distilled water and washed with K 2 CO 3 Adjust to neutral to obtain a crude product; centrifuge the crude product to remove the precipitate, and then perform dialysis to obtain carbon quantum dots. The raw materials selected in the invention are low in price, stable in source and simple in the preparation process. The obtained carbon quantum dots can emit yellow fluorescence and have high quantum yield, and are suitable for photoelectric conversion, biological imaging, ion sensing and other fields.

Description

technical field [0001] The invention relates to a cheap preparation method of a class of yellow light-emitting carbon quantum dots, belonging to the technical field of nanometer material preparation. Background technique [0002] Luminescent materials are widely used in the fields of optoelectronic devices, biomarkers and biomedicine. For a long time, the luminescent materials that have been widely concerned and practically applied in human life and production mainly include organic dyes, rare earth complexes, semiconductor quantum dots, and metal nanoclusters. Although these luminescent materials are rich in variety, high in quantum yield and adjustable in luminescent wavelength, they also have their limitations, such as easy degradation, poor photostability, high price, non-renewable, etc., and most of them are toxic so that they can be used in The field of biomedicine is limited. Therefore, searching for new luminescent materials has always been the goal pursued by chem...

Claims

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Application Information

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IPC IPC(8): C09K11/65C01B31/02B82Y30/00B82Y20/00B82Y40/00
CPCC09K11/65B82Y20/00B82Y30/00B82Y40/00C01P2002/82C01P2002/84C01P2004/04C01P2004/64
Inventor 李洪光张庆红孙晓峰阮红
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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