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Fluorescent polymer dot, hydrothermal synthesis method through linear non-conjugated polymers and application thereof

A technology of non-conjugated polymers and fluorescent polymers, applied in chemical instruments and methods, luminescent materials, nano-carbons, etc., can solve the problems of complex preparation process and high cost

Inactive Publication Date: 2013-02-06
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fluorescent quantum yield of this polymer dot is very high, but its preparation process is very complicated and the cost is relatively high

Method used

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  • Fluorescent polymer dot, hydrothermal synthesis method through linear non-conjugated polymers and application thereof
  • Fluorescent polymer dot, hydrothermal synthesis method through linear non-conjugated polymers and application thereof
  • Fluorescent polymer dot, hydrothermal synthesis method through linear non-conjugated polymers and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 5 g of PVA solid particles (DP=1750±50, Sinopharm Chemical Reagent, its calculated weight average molecular weight is about 80,000) and place it in a beaker, add 100 mL of deionized water and let it swell overnight. Then heat in a water bath at 95° C. with constant stirring until the PVA solid particles are completely dissolved to obtain a PVA aqueous solution with a concentration of 50 mg / mL.

[0029] Measure 10mL of the above aqueous solution, transfer it into a 20mL polytetrafluoroethylene-lined stainless steel reaction kettle, tighten the lid of the kettle, and react at 200°C for 10 hours. After the end, the reactor was naturally cooled to room temperature, and a brownish-yellow liquid was obtained, which was the aqueous solution of polymer dots.

[0030] The fluorescence spectra of the obtained polymer dots ( figure 1 ), the best excitation peak is at 375nm, the best emission peak is at 475nm, and the properties of upconversion can be observed (there is also...

Embodiment 2

[0032] Measure 2 mL of the 50 mg / mL PVA aqueous solution in Example 1, add 48 mL of deionized water, and stir evenly to obtain a PVA aqueous solution with a concentration of 2 mg / mL.

[0033] At the same time, PVA aqueous solutions with concentrations of 0.01 mg / mL, 0.08 mg / mL, 0.4 mg / mL, 10 mg / mL, 50 mg / mL and 100 mg / mL were prepared.

[0034] Measure 10mL of the prepared liquid, transfer it into a 20mL polytetrafluoroethylene-lined stainless steel kettle, tighten the lid of the kettle, and react at 200°C for 10 hours. After the end, the reactor was allowed to cool down to room temperature naturally, and a light yellow liquid was obtained, which was the aqueous solution of polymer dots.

[0035] Changing the initial concentration of PVA will change the fluorescence intensity of the prepared polymer dots ( Figure 9 ), under normal circumstances, the concentration of PVA is large, the carbonization centers generated are many, and the fluorescence generated is strong.

Embodiment 3

[0037] Weigh 5 g of PVA solid powder (MW ≈ 10000, 30000, 80000, 98% alcoholysis, Aldrich) into a beaker, add 100 mL of deionized water, and let it swell overnight. Then heat in a water bath at 95° C. with constant stirring until the PVA solid powder is completely dissolved to obtain a PVA aqueous solution with a concentration of 50 mg / mL.

[0038] Measure 10mL of the prepared liquid, transfer it into a 20mL polytetrafluoroethylene-lined stainless steel kettle, tighten the lid of the kettle, and react at 200°C for 10 hours. After the end, the reactor was naturally cooled to room temperature, and a brownish-yellow liquid was obtained, which was the aqueous solution of polymer dots.

[0039] The fluorescent properties of polymer dots prepared by PVA with different molecular weights are similar ( Figure 10). Under the excitation of 375nm light, the obtained fluorescence emission peaks are located at around 475nm.

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Abstract

The invention belongs to the technical field of preparation of carbon nanometer materials, and particularly relates to a polymer dot, a preparation method and an application thereof as the fluorescent material. The polymer dot with a fluorescent property is synthesized by linear non-conjugated polymers such as polyvinyl alcohol (PVA) under a hydrothermal condition. The non-conjugated polymers such as the PVA, polyetherimide (PEI), polyethylene glycol (PEG) or polyethylene oxide (PEO) are prepared into an aqueous solution with the concentration of 0.01-100mg / ml, the aqueous solution is transferred to a reaction kettle for hydrothermal reaction at a temperature of 160-250 DEG C for 2-10 hours, the reaction kettle is cooled to the room temperature after the reaction to obtain the polymer dot aqueous solution. The synthesized polymer dot not only has the fluorescent property, but also better maintains the properties of polymer chains. The polymer dot aqueous solution prepared by the PVA can emit aquamarine blue fluorescence under a portable ultraviolet lamp, and fluorescent screens and fluorescent filaments can be produced through methods such as spin coating and electrospinning simultaneously.

Description

technical field [0001] The invention belongs to the technical field of preparation of carbon nanomaterials, in particular to a polymer dot with fluorescent properties synthesized by polyvinyl alcohol and other linear non-conjugated polymers under hydrothermal conditions, a preparation method and its use as a fluorescent material Applications. Background technique [0002] In recent years, carbon nanofluorescent materials have received more and more attention. Carbon nanodots (Carbon nanodots) usually refer to carbon particles with a diameter of less than 10nm, including graphene quantum dots (GQDs), carbon dots (C-dots), Nanodiamond, etc. Compared with traditional organic dyes and semiconductor quantum dots, carbon nanodots have the characteristics of chemical stability, low toxicity, biocompatibility, and easy modification, so they are widely used in biological imaging, chemical detection, sensing, optoelectronics and other fields. a broad application prospect. [0003] ...

Claims

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Application Information

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IPC IPC(8): C09K11/65C09K11/02C01B31/02C01B32/15
Inventor 杨柏宋玉彬朱守俊张俊虎
Owner JILIN UNIV
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