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Double colour fluorescent chemical sensor used for visually detecting explosive and manufacturing method thereof

A dual-emission fluorescent and chemical sensor technology, applied in the fields of fluorescence/phosphorescence, material excitation analysis, etc., to achieve simple operation, avoid interference, and remarkable effect

Active Publication Date: 2012-05-23
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, quantum dots have not been reported in the visual detection of explosives

Method used

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  • Double colour fluorescent chemical sensor used for visually detecting explosive and manufacturing method thereof
  • Double colour fluorescent chemical sensor used for visually detecting explosive and manufacturing method thereof
  • Double colour fluorescent chemical sensor used for visually detecting explosive and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Preparation of luminescent and stable quantum dot-embedded silica nanoparticles

[0031] 0.2284g cadmium chloride (CdCl 2 ·2.5H 2 O) was added to 250 mL of deoxygenated ultrapure water, followed by 0.21 mL of mercaptopropionic acid, and its pH was adjusted to 11.2 with 1 M NaOH solution to form a solution containing sulfhydryl compounds and cadmium ions. On the other hand, take 0.0319 g of tellurium powder and 0.05 g of sodium borohydride in 2 mL of ultrapure water, and react in an ice bath for more than 8 hours under nitrogen protection. 5mL of 0.5M dilute sulfuric acid solution was poured into the resulting sodium tellurium hydride solution. will generate H 2 All Te was passed into the above-mentioned cadmium ion solution, stirred for 20 minutes, and then heated to reflux. By controlling the reflux time, an aqueous solution of cadmium telluride quantum dots with stable mercaptopropionic acid and a fluorescence emission peak of 490-680 nm can be obtained. The p...

Embodiment 2

[0038] 1. Preparation of luminescent and stable quantum dot-embedded silica nanoparticles

[0039] 0.2284g cadmium chloride (CdCl 2 ·2.5H 2 O) was added to 250 mL of deoxygenated ultrapure water, followed by 0.21 mL of mercaptopropionic acid, and its pH was adjusted to 11.2 with 1 M NaOH solution to form a solution containing sulfhydryl compounds and cadmium ions. On the other hand, take 0.0319 g of tellurium powder and 0.05 g of sodium borohydride in 2 mL of ultrapure water, and react in an ice bath for more than 8 hours under nitrogen protection. 5 mL of 0.5M dilute sulfuric acid solution was poured into the resulting sodium tellurium hydride solution. will generate H 2 All Te was passed into the above-mentioned cadmium ion solution, stirred for 20 minutes, and then heated to reflux. By controlling the reflux time, an aqueous solution of cadmium telluride quantum dots with stable mercaptopropionic acid and a fluorescence emission peak of 490-680 nm can be obtained. The ...

Embodiment 3

[0046] 1. Preparation of luminescent and stable quantum dot-embedded silica nanoparticles

[0047] 0.2284g cadmium chloride (CdCl 2 ·2.5H 2 O) was added to 250 mL of deoxygenated ultrapure water, followed by 0.21 mL of mercaptopropionic acid, and its pH was adjusted to 11.2 with 1 M NaOH solution to form a solution containing sulfhydryl compounds and cadmium ions. On the other hand, take 0.0319 g of tellurium powder and 0.05 g of sodium borohydride in 2 mL of ultrapure water, and react in an ice bath for more than 8 hours under nitrogen protection. 5mL of 0.5M dilute sulfuric acid solution was poured into the resulting sodium tellurium hydride solution. will generate H 2 All Te was passed into the above-mentioned cadmium ion solution, stirred for 20 minutes, and then heated to reflux. By controlling the reflux time, an aqueous solution of cadmium telluride quantum dots with stable mercaptopropionic acid and a fluorescence emission peak of 490-680 nm can be obtained. The p...

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Abstract

The invention relates to a double colour fluorescent chemical sensor used for visually detecting explosive, in particular to a paper-based or membrane-based sensor comprising a filter paper or glass slide substrate and double colour quantum dot superstructure silicon oxide nano particles uniformly distributed on the substrate. The method for manufacturing the sensor comprises the following steps of: firstly embedding red or green quantum dots into silicon oxide nano particles, aminating the surface of silicon oxide, then carrying out covalence coupling and coating a green or red quantum dot sensitive layer to obtain the double colour quantum dot superstructure silicon oxide nano particles, and finally processing to obtain the fluorescent chemical sensor. By applying the sensor, explosive residue with the trace of 5nanogram / mm<2> can be visually and rapidly detected online in real time. The fluorescence intensity of outer quantum dots is 2-10 times that of inner quantum dots.

Description

1. Technical field [0001] The invention relates to a fluorescent chemical sensor and a preparation method thereof, in particular to a fluorescent chemical sensor for visual analysis and detection of trace amounts of explosives and a preparation method thereof, in particular to a multicolor quantum dot double emission fluorescent signal visual detection TNT A sensor for explosives and a method for making the same. 2. Background technology [0002] Frequent terrorist incidents in recent years have always threatened the safety of people's lives and property, and seriously affected the harmony and stability of society. These terrorist incidents usually use explosives to carry out terrorist attacks, so to prevent similar incidents from happening, strict inspection and detection of explosives must be carried out. On the other hand, the detection of unexploded mines all over the world and the elimination of safety hazards fundamentally depend on the improvement of explosive detect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64
Inventor 张忠平张奎王素华关贵俭刘变化
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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