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Red light carbon dots, red light carbon dots-cellulose composite film and preparation method thereof

A cellulose film, cellulose technology, applied in chemical instruments and methods, nanocarbons, luminescent materials, etc.

Active Publication Date: 2022-04-08
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, whether it is silica, hydrogel, or polymer materials such as PEI and PEG combined with carbon dots to form a composite material, this method of improving the quantum efficiency and luminescence stability of carbon dots is a physical mixture, and its role is mostly Provide a grid matrix structure to reduce non-radiative transitions by hindering the aggregation of carbon dots, which has limited improvement in quantum efficiency and luminescence stability

Method used

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  • Red light carbon dots, red light carbon dots-cellulose composite film and preparation method thereof
  • Red light carbon dots, red light carbon dots-cellulose composite film and preparation method thereof
  • Red light carbon dots, red light carbon dots-cellulose composite film and preparation method thereof

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preparation example Construction

[0060] Preparation of red light carbon dots

[0061] The invention uses citric acid and formamide as precursors, and adopts a hydrothermal method to synthesize red light carbon dots.

[0062] In a preferred embodiment, in parts by weight, 10-20 parts of formamide are added to 10-20 parts of ethanol containing 1-5 parts of citric acid, and stirred at 300-1000 rpm until the citric acid is completely dissolved. Then, any heating method known in the art can be used for heating, heating to 140-180° C. for 6-10 hours, and filtering to obtain red light carbon dots. Optionally, the resulting red-emitting carbon dots can be collected after drying and stored at low temperature.

[0063] In some embodiments of the present invention, for the purpose of avoiding the influence of impurities, the citric acid is citric acid monohydrate (A.R.); the ethanol is absolute ethanol (A.R.); the formamide has a purity of 99%. Formamide (A.R.); citric acid, ethanol, and formamide were all purchased f...

Embodiment 1

[0071] A method for preparing red light carbon dots-cellulose composite film by compounding red light carbon dots and cellulose film, comprising the following steps:

[0072] (1) Add 2.5 g of citric acid monohydrate into 15 mL of absolute ethanol, stir at 600 rpm until a clear solution is obtained, and obtain a citric acid solution;

[0073] (2) Add 15 mL of formamide with a purity of 99% dropwise to the resulting citric acid solution, stir at 600 rpm, transfer to a 50 mL polytetrafluoroethylene reactor after stirring, and heat in an oven at 160°C for 8 hours to obtain red Light carbon dot solution;

[0074] (3) Suction filter the obtained red light carbon dot solution to remove unreacted precursors and large-particle by-products to obtain a brown solution, add sodium hydroxide and ethanol to centrifugal speed to 8000r / min, and extract the lower layer of red CDs, which are red light carbon dots, are collected and stored at low temperature.

[0075] (4) Place about 5-6cm MD44...

Embodiment 2

[0079] A method for preparing red light carbon dots-cellulose composite film by compounding red light carbon dots and cellulose film, comprising the following steps:

[0080] (1) Add 4.0 g of citric acid monohydrate into 15 mL of absolute ethanol, stir at 600 rpm until a clear solution is obtained, and obtain a citric acid solution;

[0081] (2) Add 15 mL of formamide with a purity of 99% dropwise to the resulting citric acid solution, stir at 600 rpm, transfer to a 50 mL polytetrafluoroethylene reactor after stirring, and heat in an oven at 160°C for 8 hours to obtain red Light carbon dot solution;

[0082] (3) Suction filter the obtained red light carbon dot solution to remove unreacted precursors and large-particle by-products to obtain a brown solution, add sodium hydroxide and ethanol to centrifugal speed to 8000r / min, and extract the lower layer of red CDs, which are red light carbon dots, are collected and stored at low temperature.

[0083] (4) Place about 5-6cm MD44...

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Abstract

A red-light carbon dot-cellulose composite film, the absorption peaks of which include 250-300nm, 300-450nm, and 450-600nm, and the emission peaks are located at 550-750nm. A preparation method of red light carbon dot-cellulose composite film, comprising the following steps: placing the cellulose film in boiling ethanol for pretreatment; putting red light carbon dots into the pretreated cellulose film, soaking React in water to obtain red light carbon dot-cellulose composite film. In the present invention, the red light carbon dots are combined with the cellulose film through chemical combination to prepare the red light carbon dot cellulose composite film. The adhesion stability of carbon dots on the cellulose membrane was studied, and it was found that not only did not destroy the structure of the membrane matrix itself, but also endowed the cellulose membrane with unique luminescent properties, the quantum efficiency of the composite membrane was increased by 5 times, and the luminous intensity was also higher than that of Pure carbon dots are strong. The invention provides a new method and idea for the red light carbon dot to realize solid light emission.

Description

technical field [0001] The invention belongs to the technical field of novel nanometer functional materials, and relates to a red light carbon dot and a preparation method thereof, and a preparation method for preparing a red light carbon dot-cellulose composite film by compounding the red light carbon dot and a cellulose film. Background technique [0002] Photoluminescence (PL) nanomaterials have received extensive scientific attention due to their wide range of applications. Since the discovery of carbon dots (Carbon dots, CDs) was first reported in 2004, many studies have focused on this kind of nanomaterials, CDs have ultra-small size, adjustable fluorescence emission, high thermal stability, low cost and easy preparation, Environmental friendliness, good biocompatibility, easy surface functionalization, etc. More importantly, it has no inherent toxicity or contains toxic elements, so it has a wide range of applications in the fields of bioimaging, photocatalysis, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/15C08J7/12C08L1/02C09K11/65
CPCC01B32/15C08J7/12C09K11/65C08J2301/02
Inventor 陈叶青朱丽娜
Owner WUYI UNIV