A dual-emission fluorescent chemical sensor and its preparation method and application

A chemical sensor and dual-emission fluorescence technology, which is applied in the direction of fluorescence/phosphorescence, material excitation analysis, etc., can solve the problems of inconvenient detection and poor stability, and achieve the effect of omitting the pretreatment process, avoiding interference, and being suitable for carrying around

Inactive Publication Date: 2015-09-30
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Claims
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AI Technical Summary

Problems solved by technology

Nitrogen dioxide can react with the organic compound sulfonylrhodamine-dithiocarbamic acid and nickel complex, so that the original non-fluorescent complex produces a fluorescent organic compound, and the fluorescence changes from colorless to red, which can be selectively Detect trace amounts of nitrogen dioxide, but this organic fluorescent ligand has poor photostability, and needs to be wetted with an organic solvent before detection, so it is not convenient to detect it anytime, anywhere
Combining quantum dots with organic dyes has not been reported so far for the visual detection of nitrogen dioxide gas pollutants

Method used

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  • A dual-emission fluorescent chemical sensor and its preparation method and application
  • A dual-emission fluorescent chemical sensor and its preparation method and application
  • A dual-emission fluorescent chemical sensor and its preparation method and application

Examples

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Effect test

Embodiment 1

[0036] Example 1: Preparation of dual emission quantum dot-porphyrin ratio fluorescent probe

[0037] 1. Preparation of cadmium telluride quantum dots

[0038] 0.2284g cadmium chloride (CdCl 2 2.5H 2 O) Add to 250mL ultrapure water, then add 0.21mL mercaptopropionic acid, and then adjust its pH value to 11 with 1M NaOH solution to form a solution containing mercapto compounds and cadmium ions. On the other hand, take 0.0319g of tellurium powder and 0.05g of sodium borohydride in 2mL of deoxygenated ultrapure water, and react in an ice bath for more than 8 hours under the protection of nitrogen. Inject 5mL of 0.5M dilute sulfuric acid solution into the resulting sodium hydride telluride solution. will generate H 2 Put all the Te into the cadmium ion solution, stir for 20 minutes, and then heat to reflux. By controlling the reflux time, an aqueous solution of cadmium telluride quantum dots with stable mercaptopropionic acid and a fluorescent emission peak at 490-680 nm can ...

Embodiment 2

[0044] Embodiment 2: Quantitative detection of nitrogen dioxide solution

[0045] Add the sample solution containing nitrogen dioxide to be detected to the ethanol solution of the fluorescent probe prepared in Example 1 for fluorescence detection. Nitrogen dioxide has a response at a content of 0.4 μM, and the detection is very sensitive. As the addition time of nitrogen dioxide solution gradually increased, the green fluorescence intensity of quantum dots remained unchanged, while the red fluorescence of porphyrin gradually recovered until it was no longer enhanced. At this time, under the ultraviolet lamp, it can be seen that the fluorescence of the probe changes from bright green to yellow, and the nonlinear relationship between the ratio of the double emission fluorescence intensity and the reaction time of nitrogen dioxide is established accordingly. In addition, within a certain trace concentration range, the fluorescent probes all have significant changes, so that the ...

Embodiment 3

[0046] Example 3: Visual detection of nitrogen dioxide pollutants in the air by a dual-color quantum dot-porphyrin superstructure silicon oxide nanoparticle sensor

[0047] Take a small amount of the ratio probe and drop two points on the inner surface of the vial without fluorescent background, use a hair dryer to quickly evaporate the solvent of the probe, and form a thin film on the inner surface of the vial, two bright green in the vial can be seen under the ultraviolet light Therefore, a small vial fluorescent sensing device that is easy to carry and can quickly and visually detect nitrogen dioxide pollutants in the air is designed. The specific operation steps are as follows: inject 1ppm, 10ppm, 100ppm, and 1000ppm nitrogen dioxide gas samples into the vial respectively, observe the color change of the fluorescent bright spots in the vial under the ultraviolet light within 2min, 5min, 10min, and 20min, and you can find bright green fluorescent spots eventually become red...

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Abstract

A double-transmission fluorescent chemical sensor takes an inner surface of a small glass bottle as a substrate and is a ratio fluorescent sensor formed by the substrate and quantum dots-porphyrin superstructure monox nano particles fixed on the substrate. The preparation method comprises the following steps: first, embedding green quantum dots into monox nano particles; then, coating red fluorescent porphyrin sensitive layer on the surface of the monox after the surface is subjected to amination in a covalence coupling manner, thereby obtaining the double-transmission quantum dot-porphyrin superstructure monox nano particles; and finally, processing the particles into the fluorescent chemical sensor. The sensor is convenient to carry and operate, can visually detect out 1ppm nitrogen dioxide gas pollutant in a real time and on-line manner, and has excitation wave having length of 370 nm.

Description

1. Technical field [0001] The present invention relates to a fluorescent chemical sensor and its preparation method, in particular to a fluorescent chemical sensor for visual analysis and detection of trace gas pollutants and its preparation method, in particular to a green quantum dot-porphyrin dual emission fluorescence signal visualization A sensor for detecting nitrogen dioxide pollutants and a preparation method thereof. 2. Background technology [0002] With the development of social economy, nitrogen dioxide gas from fuel equipment and gasoline vehicles has gradually become one of the main chemical pollutants in the atmosphere. As we all know, nitrogen dioxide is a poisonous gas, which not only damages human health, but also causes some environmental problems such as acid rain and photochemical smog. Therefore, it has become a key step to detect the content of nitrogen dioxide in the air of different regions to solve environmental problems. Although, so far, many me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64
Inventor 王素华朱后娟张奎
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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