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Preparation method of carbon quantum dots with blue-green fluorescence

A technology of blue-green fluorescence and carbon quantum dots, which is applied in the field of preparation of fluorescent nanomaterials, can solve the problems of single fluorescence color and low quantum yield of carbon quantum dots, and achieve high quantum yield, simple and easy method, and excellent reaction conditions mild effect

Active Publication Date: 2015-07-01
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] But the fluorescent color of carbon quantum dots prepared by most methods is relatively single, only has blue fluorescence, and quantum yield is relatively low (generally lower than 10%)

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  • Preparation method of carbon quantum dots with blue-green fluorescence
  • Preparation method of carbon quantum dots with blue-green fluorescence
  • Preparation method of carbon quantum dots with blue-green fluorescence

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1 Preparation of carbon quantum dots

[0034] Take 0.036g of Kapton-type polyimide (PI), 10g of purified water, put them in a 15ml hydrothermal kettle, and set the hydrothermal condition at 180°C for 3 hours. After the reaction, the clear liquid was taken as the obtained carbon quantum dot solution. Measure main peak at 485nm through fluorescence spectrometer (as figure 2 Shown), the half peak width is about 50nm, measured by X-ray diffractometer, its spectrum (such as image 3 shown) shows a broad (002) peak at 2θ = 25°, which further proves the amorphous structure of white light-emitting carbon quantum dots. by transmission electron microscopy (e.g. figure 1 Shown) It can be seen that the white light carbon quantum dots are uniform in size and well dispersed, similar to a spherical shape. According to its size distribution diagram, we obtained that the average diameter of white light carbon quantum dots is 3.4nm. by transmission electron microscopy (e.g. Figur...

Embodiment 2

[0038] 1 Preparation of carbon quantum dots

[0039] Take 0.047g of Kapton type polyimide (PI), 10g of purified water, 0.003g of ethylenediamine, 0.03g of γ-methacryloxypropyl trimethoxysilane (KH570), put them in a 15ml water heating kettle, set Set the hydrothermal condition as 170°C for 6h. After the reaction, take the solution in the still and centrifuge the centrifuge tube at 12000rpm for 20min to obtain the supernatant. The obtained clear liquid is filtered with a 30KD ultrafiltration molecular membrane, and the filtrate is collected as the obtained carbon dots. The fluorescence emission peak of the prepared carbon dots is at 495nm, the fluorescence lifetime is 4ns, and the diameter is 5nm.

[0040] 2 screen printing

[0041] Take 2ml of the carbon quantum dots prepared above, weigh 8g of polyvinylpyrrolidone (K-30), mix the two, and magnetically stir for 2h, let stand for 2h, take 2g of the solution on the screen of the screen printing instrument, and Filter paper w...

Embodiment 3

[0043] 1 Preparation of carbon quantum dots

[0044] Take 0.029g Kapton-type polyimide (PI), 10g purified water, 0.008g ethylenediamine, 0.07g γ-methacryloxypropyltrimethoxysilane (KH570), put them in a 15ml water heating kettle, Set the hydrothermal condition as 195°C for 5h. After the reaction, take the solution in the still and centrifuge the centrifuge tube at 12000rpm for 20min to obtain the supernatant. And filter the obtained clear liquid with a 30KD ultrafiltration molecular membrane, collect the filtrate, and obtain carbon dots. The fluorescence emission peak of the prepared carbon dots is at 505nm, the fluorescence lifetime is at 5.2ns, and the diameter is at 6.5nm.

[0045] 2 screen printing

[0046] Take 2ml of the carbon quantum dots prepared above, weigh 8g of polyvinylpyrrolidone (K-30), mix the two, and magnetically stir for 2h, let stand for 2h, take 2g of the solution on the screen of the screen printing instrument, and Filter paper was placed under the s...

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Abstract

The invention relates to a preparation method of carbon quantum dots with blue-green fluorescence, which comprises the following specific steps: putting polyimide and water into a hydrothermal kettle, or putting polyimide, water and a passivator into a hydrothermal kettle; then, putting the hydrothermal kettle into a drying oven, and increasing the temperature to carry out a heating reaction; after the reaction is completed, stopping heating, cooling, and taking a solution out the hydrothermal kettle; and centrifugalizing, taking liquid supernatant, dialyzing the liquid supernatant by using a dialysis membrane, thus obtaining a carbon quantum dot aqueous solution. The method disclosed by the invention has the characteristics of mild reaction conditions, simpleness, and easiness for implementation. Prepared carbon quantum dots with blue-green fluorescence can stably emit blue-green fluorescence and the quantum yield is high.

Description

technical field [0001] The invention relates to a method for preparing fluorescent nanometer materials, in particular to a method for preparing carbon quantum dots with blue-green fluorescence. Background technique [0002] Carbon nanomaterials have undergone rapid progress in the past two decades and have become one of the most promising materials that have changed and will continue to change human life. In recent years, the discovery of carbon quantum dots has attracted widespread attention. Carbon quantum dots not only have excellent properties of traditional semiconductor quantum dots, such as size fluorescence response, bleaching resistance and good biocompatibility. At the same time, compared with traditional semiconductor quantum dot materials, carbon quantum dots are not toxic. [0003] Carbon quantum dots not only have excellent performance, but also their raw materials are cheap, and the preparation methods are various and simple. [0004] However, the fluoresce...

Claims

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Application Information

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IPC IPC(8): C01B31/02C09K11/65B82Y30/00
Inventor 陈苏黄立凯
Owner NANJING UNIV OF TECH
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