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Cysteine and citric acid derivative fluorescent powder and preparation method therefor

A cysteine ​​and citric acid technology, applied in the field of fluorescent materials, can solve the problems of low fluorescence quantum yield, troublesome synthesis route, limited raw materials, etc., and achieve the effects of high fluorescence quantum yield, easy amplification, and easy method.

Inactive Publication Date: 2015-11-11
MINNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] (2) Among the methods for preparing fluorescent polymers by polymerization of non-fluorescent functional monomers, there are not many effective methods, and the synthetic route is troublesome
Several reported cases of "top-down" or "bottom-up" synthesis of fluorescent polymer nanodots using the hydrothermal method, the fluorescence quantum yield is not high, and the raw materials used are limited

Method used

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  • Cysteine and citric acid derivative fluorescent powder and preparation method therefor
  • Cysteine and citric acid derivative fluorescent powder and preparation method therefor
  • Cysteine and citric acid derivative fluorescent powder and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 1g of cysteine ​​and 1g of citric acid into a three-necked flask, then add 20ml of oleic acid, stir and heat, and set the temperature to 120°C. When the temperature rises to 80 degrees, the reaction time is 30 minutes, and the color gradually changes from colorless to yellow, and the color deepens as the reaction progresses. After 30 minutes, the reaction was stopped, and the reaction solution was poured out while it was hot. The product was fully washed with n-hexane, and dried in vacuum at 50°C to obtain a cysteine-citric acid composite fluorescent polymer.

[0036] The fluorescent quantum yield of cysteine ​​and citric acid composite fluorescent polymer in embodiment 1 is measured at room temperature, with quinine sulfate (solvent is the H of 0.1M 2 SO 4 , the quantum yield is 0.56) as a reference, by measuring the fluorescence integral intensity obtained under the same excitation conditions and the ultraviolet absorption value under the excitation wavelength ...

Embodiment 2

[0040] Weigh 1g of cysteine ​​and 1g of citric acid into a three-necked flask, then add 20ml of oleic acid, stir and heat, and set the temperature to 160°C. When the temperature rose to 110°C, the solid dissolved, and the reaction timed for 30 minutes, the color gradually changed from colorless to yellow, and the color deepened as the reaction progressed. After 30 minutes, the reaction was stopped, and the reaction solution was poured out while it was hot. The product was fully washed with n-hexane, and dried in vacuum at 50°C to obtain a cysteine-citric acid composite fluorescent polymer.

[0041] The fluorescent quantum yield of cysteine ​​and citric acid composite fluorescent polymer in embodiment 2 is measured at room temperature, with quinine sulfate (solvent is the H of 0.1M 2 SO 4 , the quantum yield is 0.56) as a reference, by measuring the fluorescence integral intensity obtained under the same excitation conditions and the ultraviolet absorption value under the exci...

Embodiment 3

[0045] The products obtained in Examples 1 and 2 are dissolved in ethanol or acetone, and then coated on a silica gel carrier. The mass ratio of the fluorescent polymer to the mass of the silica gel powder is 0.1-20%, to obtain a luminescent phosphor, which emits light under the irradiation of 365nm ultraviolet light. Bright blue light.

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Abstract

The invention discloses cysteine and citric acid derivative fluorescent powder and a preparation method therefor, and belongs to the field of fluorescent materials. According to the preparation method for the cysteine and citric acid derivative fluorescent powder, natural products cysteine and citric acid are adopted as raw materials, and the raw materials react in oleic acid to prepare fluorescent polymer with a high quantum yield; and the fluorescent polyme emits bright blue light under irradiation of 365nm ultraviolet light. The synthesized product is characterized by ultraviolet light, fluorescent light and the like, wherein the quantum yield of the fluorescent polymer can reach 74.2%. The cysteine and citric acid derivative fluorescent powder is coated on a silica-gel carrier so as to obtain light-emitting fluorescent powder. The invention provides a method for synthesizing polymer with a high fluorescence quantum yield from biocompatible nonfluorescent raw materials, and a method for simply preparing the fluorescent powder.

Description

technical field [0001] The invention belongs to the field of fluorescent materials, in particular to a fluorescent powder derived from cysteine ​​and citric acid and a preparation method thereof. Background technique [0002] In recent years, the application of fluorescent nanomaterials in fluorescent chemical sensors, fluorescent imaging, drug carriers, fluorescent probes, and LED optical devices has attracted widespread attention. Since semiconductor quantum dots contain heavy metals such as chromium, which are potentially biotoxic, it is necessary to develop non-toxic fluorescent nano-substitutes. Carbon-based fluorescent nanomaterials are good candidates. Fluorescent nanomaterials represented by carbon quantum dots have been synthesized by hydrothermal method, microwave method, ultrasonic method, and solvothermal method. In order to obtain excellent luminescent properties, polymers are often used to passivate the surface of carbon quantum dots, or introduce N, S, B and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06
Inventor 姚碧霞翁文马杰
Owner MINNAN NORMAL UNIV
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