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Preparation method of CDs/PVDF (Polyvinylidene Fluoride) composite thin film

A composite film and solution technology, applied in the field of material chemistry, can solve the problems of reduced transparency of composite materials, self-quenching of carbon quantum dot fluorescence, etc., and achieves the effects of excellent fluorescence characteristics, simple operation and realization process, and simple equipment.

Active Publication Date: 2018-03-20
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of compounding CDs with polymer materials, carbon quantum dots are prone to fluorescence self-quenching and the reduction of the transparency of the composite material. Therefore, it is particularly important to find a preparation method that can solve such problems.

Method used

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  • Preparation method of CDs/PVDF (Polyvinylidene Fluoride) composite thin film
  • Preparation method of CDs/PVDF (Polyvinylidene Fluoride) composite thin film
  • Preparation method of CDs/PVDF (Polyvinylidene Fluoride) composite thin film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 A kind of preparation method of CDs / PVDF composite film

[0027] (1) Preparation method

[0028] 1) Weigh 3.08g of citric acid and 4.63ml of diethylenetriamine, dissolve in 80ml of deionized water, stir magnetically for 30min, and then sonicate for 10min. The mixed solution was transferred to a hydrothermal kettle, and the hydrothermal kettle was placed in an oven, heated at 180°C for 5 hours, and cooled to room temperature with the furnace to obtain a carbon quantum dot CDs solution, which was stored in a refrigerator at 4°C for later use.

[0029] 2) Add 0.25ml CDs solution into a 100ml beaker containing 10ml DMF solution, heat to 60°C under magnetic stirring, and stir at 60°C for 30 minutes to obtain CDs / DMF solution.

[0030] 3) Weigh 3.16g of PVDF and dissolve it in 30ml of DMF, heat it in a water bath to 60°C under magnetic stirring, and stir at 60°C for 30 minutes to obtain a PVDF solution.

[0031] 4) Mix the CDs / DMF solution and the PVDF solution...

Embodiment 2

[0038] Example 2 Effect of CDs doping ratio on luminous intensity

[0039] (1) Preparation method

[0040] 1) Weigh 3.08g of citric acid and 4.63ml of diethylenetriamine, dissolve in 80ml of deionized water, stir magnetically for 30min, and then sonicate for 10min. The mixed solution was transferred to a hydrothermal kettle, and the hydrothermal kettle was placed in an oven, heated at 180°C for 5 hours, and cooled to room temperature with the furnace to obtain a carbon quantum dot CDs solution, which was stored in a refrigerator at 4°C for later use.

[0041] 2) Take 0.25ml of CDs solution respectively, add them into beakers containing 5ml, 10ml, 20ml, 40ml, 80ml, and 160ml of DMF solution, heat to 60°C under magnetic stirring, and stir at 60°C for 30 minutes to obtain CDs / DMF solution with a volume ratio of 1:20, 1:40, 1:80, 1:160, 1:320, 1:640.

[0042] 3) Weigh 3.16g of PVDF and dissolve it in 30ml of DMF, heat it in a water bath to 60°C under magnetic stirring, and stir ...

Embodiment 3

[0047] Example 3 Effect of PVDF mass fraction on film luminescence

[0048] (1) Preparation method

[0049] 1) Weigh 3.08g of citric acid and 4.63ml of diethylenetriamine, dissolve in 80ml of deionized water, stir magnetically for 30min, and then sonicate for 10min. The mixed solution was transferred to a hydrothermal kettle, and the hydrothermal kettle was placed in an oven, heated at 180°C for 5 hours, and cooled to room temperature with the furnace to obtain a carbon quantum dot CDs solution, which was stored in a refrigerator at 4°C for later use.

[0050] 2) Add 0.25ml CDs solution into a 100ml beaker containing 10ml DMF solution, heat to 60°C under magnetic stirring, and stir at 60°C for 30 minutes to obtain CDs / DMF solution.

[0051] 3) Weigh 0.525g, 0.788g and 1.05g of PVDF and dissolve them in 10ml of DMF, heat them in a water bath to 60°C under magnetic stirring, and stir at 60°C for 30 minutes to obtain PVDF content of 5wt%, respectively. 7.5wt% and 10wt% PVDF sol...

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Abstract

The invention relates to a preparation method of a CDs / PVDF (Polyvinylidene Fluoride) composite thin film. The preparation method comprises the following steps: taking blue carbon quantum dots prepared from citric acid and diethylenetriamine through a hydrothermal method as fluorescent filler; combining the fluorescent filler with PVDF with excellent piezoelectric properties to obtain the CDs / PVDFcomposite thin film by a blending casting mode. By use of the CDs / PVDF composite thin film, the fluorescence self-quenching phenomenon of solid-phase carbon quantum dots is well avoided; the CDs / PVDFcomposite thin film retains excellent fluorescent characteristics of the carbon quantum dots as well as chemical corrosion resistance, high temperature resistance, oxidation resistance, weather fastness and ray radiation resistance; on the basis of combining original characteristics of the composite thin film with excellent piezoelectricity, dielectricity and pyroelectricity, a composite functional thin film material integrating luminous property with piezoelectricity is formed.

Description

technical field [0001] The invention belongs to the field of material chemistry, and in particular relates to combining blue carbon quantum dots prepared by citric acid and diethylenetriamine hydrothermal method as fluorescent fillers with polyvinylidene fluoride (PVDF) with excellent piezoelectric properties , CDs / PVDF composite films were prepared by blending and casting. On the one hand, the problem of fluorescence self-quenching and agglomeration of carbon quantum dots is solved, and on the other hand, a composite functional thin film material integrating luminescence and piezoelectricity is obtained. Background technique [0002] Due to their excellent properties, such as good water solubility, low toxicity, easy synthesis, and low cost of raw materials, carbon quantum dots have broad application prospects in biological imaging and photoelectric functional devices. Polyvinylidene fluoride has excellent chemical corrosion resistance, high temperature resistance, oxidati...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/65
CPCC09K11/025C09K11/65
Inventor 卢雪梅王绩伟徐伟力赵铭钰敖韵琪范晓星谭天亚张义勐王健邱钰张磊张晓吕书宁
Owner LIAONING UNIVERSITY
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