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Quick preparation method of high-concentration perovskite quantum dot in fiber, and time resolution detection application of quick preparation method

A technology of perovskite and quantum dots, applied in fiber processing, chemical instruments and methods, analytical materials, etc., can solve problems such as strong luminous intensity, accelerated measurement speed, and high doping concentration of perovskite quantum dots

Inactive Publication Date: 2020-09-29
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is currently no perovskite quantum dot composite fiber for fluorescence lifetime detection. This is because the sensitive fluorescence lifetime detection method requires high doping concentration of perovskite quantum dots in the fiber to make the luminous intensity strong, which can reduce the measurement background noise and faster measurements

Method used

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  • Quick preparation method of high-concentration perovskite quantum dot in fiber, and time resolution detection application of quick preparation method
  • Quick preparation method of high-concentration perovskite quantum dot in fiber, and time resolution detection application of quick preparation method
  • Quick preparation method of high-concentration perovskite quantum dot in fiber, and time resolution detection application of quick preparation method

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Embodiment 1

[0029] The rapid preparation of high-concentration perovskite quantum dots in fibers and the time-resolved detection of rhodamine B include the following steps:

[0030] (1) Prepare the spinning precursor solution: dissolve 0.424g cesium bromide and 0.74g lead bromide in 5mL of dimethyl sulfoxide, then add 1.5g of polyvinylidene fluoride powder into the mixture and stir until uniform, then add 5mL of acetone was stirred for 2h to obtain a uniform spinning precursor solution.

[0031](2) Preparation of solid organic fibers rich in metal salts: Add the precursor solution obtained in step (1) into the electrospinning device, push the flow rate of the pump to 20 μl / min, and keep the collector drum 10-30 cm away from the spinning device , The drum speed is 400-1000 rpm. The voltage is 10-20kV, the humidity is 25-40%, and the temperature is 20-40 DEG C. The prepared solid organic fiber rich in metal salt is off-white.

[0032] (3) Three-stage microwave treatment of fibers: the sol...

Embodiment 2

[0038] Rapid preparation of high-concentration perovskite quantum dots in fibers and time-resolved detection of rhodamine B include the following steps:

[0039] (1) Configure the spinning precursor solution: dissolve 0.424g of cesium bromide and 0.74g of lead bromide in 4mL of dimethylformamide, then add 1g of polystyrene powder into the mixture and stir until uniform, Then 6 mL of dimethylformamide was added, and after stirring for 3 h, a uniform spinning precursor solution was obtained.

[0040] (2) Preparation of solid organic fibers rich in metal salts: Add the precursor solution obtained in step (1) into the electrospinning device, push the flow rate of the pump to 20 μl / min, and keep the collector drum 10-30 cm away from the spinning device , The drum speed is 400-1000 rpm. The voltage is 10-20kV, the humidity is 25-40%, and the temperature is 20-40 DEG C. The prepared solid organic fiber rich in metal salt is off-white.

[0041] (3) Three-stage microwave treatment of...

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Abstract

The invention discloses a quick preparation method of a high-concentration perovskite quantum dot in a fiber, and time resolution detection application of the quick preparation method. The quick preparation method comprises the steps: firstly, a spinning precursor solution is prepared from cesium bromide, lead bromide and a fiber raw material, through electrostatic spinning, a solid organic fiberrich in metal salt is obtained, the solid organic fiber is subjected to aftertreatment for not more than 1 min through a three-stage microwave method (treatment is conducted at the low frequency to enable metal salt ions to swing along with solid organic matter electric dipole for local aggregation, low-frequency treatment is quickly switched to high-frequency treatment to enable the metal salt ions to be quickly crystallized and nucleated, and finally high-frequency treatment is switched to intermediate-frequency treatment to enable the quantum dot to continue growing in the solid organic fiber), and the inorganic perovskite quantum dot with the small particle size (about 5 nm), the high doping concentration and uniform distribution quickly grows in the fiber. The fiber is high in illumination intensity (the yield of fluorescent quanta is large than 90%), quick time resolution detection can be achieved through a single drop mode, and the quick preparation method can be applied to quick ultrasensitive detection of the concentration of water-soluble matter.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation and detection, and relates to a rapid preparation method of high-concentration perovskite quantum dots in fibers and its time-resolved detection application. Background technique [0002] As a new type of fluorescent material, perovskite quantum dots have attracted extensive attention in recent years. However, perovskite quantum dots are easily damaged when exposed to air and moisture in the air. Encapsulating perovskite quantum dots in organic polymer fibers is currently a good strategy to enhance the stability of perovskite quantum dots. In order to prepare embedded perovskite quantum dot composite fibers, there are currently several technical methods as follows: one is to first prepare perovskite quantum dots, and then dope them into the polymer spinning precursor solution, and finally get Polymer composite fibers doped with perovskite quantum dots, however, for electrospinni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/00C09K11/02C09K11/66G01N21/64
CPCC09K11/025C09K11/665D01D5/003D01D5/0061D01D5/0092G01N21/6408
Inventor 张俊倪徳剑李如龙云泽
Owner QINGDAO UNIV
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