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

A dual emission fluorescence, chemical sensor technology, applied in fluorescence/phosphorescence, material excitation analysis, etc., to achieve the effect of good selectivity, simple operation and high sensitivity

Active Publication Date: 2011-06-15
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, quantum dots have not been rep

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
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Example Embodiment

[0029] Example 1

[0030] 1. Preparation of silicon oxide nanoparticles with stable luminescence and embedded quantum dots

[0031] 0.2284g cadmium chloride (CdCl 2 ·2.5H 2 O) Add to 250mL of deoxygenated ultrapure water, then add 0.21mL of mercaptopropionic acid, and then adjust the pH to 11.2 with 1M NaOH solution to form a solution containing mercapto compounds and cadmium ions. On the other hand, 0.0319g of tellurium powder and 0.05g of sodium borohydride were put in 2mL of ultrapure water, and under the protection of nitrogen, the reaction was carried out in an ice bath for more than 8 hours. Inject 5 mL of 0.5M dilute sulfuric acid solution into the resulting sodium tellurium hydride solution. Will generate H 2 All Te was passed into the cadmium ion solution, stirred for 20 minutes, and 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 at 490-680 nm can ...

Example Embodiment

[0037] Example 2

[0038] 1. Preparation of silicon oxide nanoparticles with stable luminescence and embedded quantum dots

[0039] 0.2284g cadmium chloride (CdCl 2 ·2.5H 2 O) Add to 250mL of deoxygenated ultrapure water, then add 0.21mL of mercaptopropionic acid, and then adjust the pH to 11.2 with 1M NaOH solution to form a solution containing mercapto compounds and cadmium ions. On the other hand, 0.0319g of tellurium powder and 0.05g of sodium borohydride were put in 2mL of ultrapure water, and under the protection of nitrogen, the reaction was carried out in an ice bath for more than 8 hours. Inject 5 mL of 0.5 M dilute sulfuric acid solution into the resulting sodium tellurium hydride solution. Will generate H 2 All Te was passed into the cadmium ion solution, stirred for 20 minutes, and 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 at 490-680 nm can...

Example Embodiment

[0045] Example 3

[0046] 1. Preparation of silicon oxide nanoparticles with stable luminescence and embedded quantum dots

[0047] 0.2284g cadmium chloride (CdCl 2 ·2.5H 2 O) Add to 250mL of deoxygenated ultrapure water, then add 0.21mL of mercaptopropionic acid, and then adjust the pH to 11.2 with 1M NaOH solution to form a solution containing mercapto compounds and cadmium ions. On the other hand, 0.0319g of tellurium powder and 0.05g of sodium borohydride were put in 2mL of ultrapure water, and under the protection of nitrogen, the reaction was carried out in an ice bath for more than 8 hours. Inject 5 mL of 0.5M dilute sulfuric acid solution into the resulting sodium tellurium hydride solution. Will generate H 2 All Te was passed into the cadmium ion solution, stirred for 20 minutes, and 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 at 490-680 nm can ...

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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 present invention relates to a fluorescent chemical sensor and its preparation method, in particular to a fluorescent chemical sensor for the visual analysis and detection of trace explosives and its preparation method, in particular to a multi-color quantum dot dual-emission fluorescent signal visual detection TNT A sensor for explosives and a method for its preparation. 2. Background technology [0002] The 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 landmines all over the world and the elimination of potential safety hazards fundamentally depend on the improvement of explosive ...

Claims

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Application Information

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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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