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Composite structure based on fluorescence resonance energy transfer as well as preparation method and application thereof

A fluorescence resonance energy and composite structure technology, applied in the field of temperature detectors, can solve the problems of limitation, easy photodegradation and chemical degradation, anti-photobleaching and poor chemical stability, so as to achieve not easy degradation, improve energy transfer efficiency, energy The effect of high transfer efficiency

Inactive Publication Date: 2020-11-27
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor photobleaching resistance and chemical stability of traditional fluorescent substances, photodegradation and chemical degradation are prone to occur during the application process, which limits the application of fluorescence resonance energy transfer.

Method used

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  • Composite structure based on fluorescence resonance energy transfer as well as preparation method and application thereof
  • Composite structure based on fluorescence resonance energy transfer as well as preparation method and application thereof
  • Composite structure based on fluorescence resonance energy transfer as well as preparation method and application thereof

Examples

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preparation example Construction

[0029] The present invention also provides a method for preparing a composite structure based on fluorescence resonance energy transfer described in the above technical solution, comprising the following steps:

[0030] Depositing a single molybdenum disulfide layer on the silicon dioxide layer in the silicon dioxide / silicon substrate by chemical vapor deposition to form a matrix;

[0031] The core-shell quantum dot dispersion liquid is coated on the single-layer molybdenum disulfide layer of the matrix, and left to stand to obtain the composite structure based on fluorescence resonance energy transfer.

[0032] The invention utilizes a chemical vapor deposition method to deposit a monolayer molybdenum disulfide layer on a silicon dioxide layer in a silicon dioxide / silicon substrate to form a matrix.

[0033] In the present invention, the substrate is preferably a commercially available product, that is, preferably a commercially available sample that utilizes chemical vapor d...

Embodiment 1

[0042] The acetone dispersion of cadmium selenide-zinc sulfide core-shell quantum dots used in this example was purchased from Nanjing Pioneer Nano Co., Ltd., with a concentration of 10 mg / mL; Monolayer molybdenum disulfide sample of the substrate.

[0043] Take 50 μL cadmium selenide-zinc sulfide core-shell quantum dot acetone dispersion (10mg / mL) and mix with 950 μL acetone to obtain cadmium selenide-zinc sulfide quantum dot acetone dilution (concentration 0.5mg / mL);

[0044] Drop 1mL cadmium selenide-zinc sulfide quantum dot acetone dilution on the monolayer molybdenum disulfide of the substrate, use a coater to spin coat at a rate of 3000r / min for 30s to form a uniform layer of core-shell quantum dots, and then Stand still for 10 minutes to obtain a composite structure based on fluorescence resonance energy transfer. The coating density of cadmium selenide-zinc sulfide quantum dots in the composite structure is 0.5mg / cm 2 , the particle size of cadmium selenide-zinc sulfide...

Embodiment 2

[0055] Similar to Example 1, the only difference is that 0.2mL cadmium selenide-zinc sulfide quantum dot acetone dilution is dropped on the monolayer molybdenum disulfide of the matrix, and the coating of cadmium selenide-zinc sulfide quantum dots in the composite structure obtained is Covering density is 0.1mg / cm 2 .

[0056] Adopt the method identical with embodiment 1 to test the variation curve of the resonance energy transfer efficiency of gained composite structure with temperature, the result is: relative sensitivity (dη ET / dT) up to 0.0032 / K, resolution up to 1.8K.

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Abstract

The invention provides a composite structure based on fluorescence resonance energy transfer as well as a preparation method and application thereof, and belongs to the technical field of temperaturedetectors. The composite structure comprises a silicon dioxide / silicon substrate, a single-layer molybdenum disulfide layer deposited on a silicon dioxide layer in the silicon dioxide / silicon substrate, and shell-core quantum dots coated on the single-layer molybdenum disulfide layer, wherein the emission wavelength of the shell-core quantum dots is 400 to 650 nm. According to the composite structure, the shell-core quantum dots with the emission wavelength of 400-650 nm are selected, and the excitation spectrum of the shell-core quantum dots is wide in range and is highly overlapped with theabsorption spectrum of the molybdenum disulfide, so that the energy transfer efficiency of the composite structure formed by the shell-core quantum dots and the molybdenum disulfide is high; meanwhile, the specific surface area of single-layer molybdenum disulfide is large, and the energy transfer efficiency of the composite structure is further improved. In addition, the shell-core quantum dots emit light stably and are not prone to degrade, so that the energy transfer efficiency of the composite structure is stable. As the composite structure is sensitive to temperature, the composite structure is expected to be applied to temperature sensing chips.

Description

technical field [0001] The invention relates to the technical field of temperature detectors, in particular to a composite structure based on fluorescence resonance energy transfer and its preparation method and application. Background technique [0002] Visual real-time monitoring of temperature has always been the focus of scientific research. Fluorescence sensing is a temperature measurement method with the advantages of high sensitivity, fast response, and visualization, and has been widely used in biomedicine and other fields. However, traditional fluorescent probes are susceptible to errors due to fluctuations in external conditions. For this reason, fluorescence resonance energy transfer technology provides a more accurate, sensitive and simple detection means. The traditional fluorescence resonance energy transfer system often uses fluorescent proteins and organic dyes as fluorescent probes, and has been widely used in biomolecules, immunoassays and other life scie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/00
CPCG01K11/00
Inventor 李娟李宝军
Owner JINAN UNIVERSITY