Double-color nanocomposite as well as paper sensor for visually detecting trinitrotoluene based on composite and manufacturing method thereof

A nanocomposite and sensor technology, applied in material excitation analysis, fluorescence/phosphorescence, etc., to achieve the effect of omitting the pretreatment process, good selectivity and remarkable effect

Inactive Publication Date: 2015-04-29
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

Therefore, using these advantages of luminescent graphene oxide and doped nanocrystals, design fluorescent chemical sensors and prepare indicator test paper, establish a new method for real-time, on-site and visual detection of trace TNT residues on the surface of envelopes, human bodies, rubber, etc. Not yet reported

Method used

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  • Double-color nanocomposite as well as paper sensor for visually detecting trinitrotoluene based on composite and manufacturing method thereof
  • Double-color nanocomposite as well as paper sensor for visually detecting trinitrotoluene based on composite and manufacturing method thereof
  • Double-color nanocomposite as well as paper sensor for visually detecting trinitrotoluene based on composite and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] 1. Preparation of functionalized luminescent graphene oxide and manganese-doped nanocrystals

[0032] 0.2 mg of acyl-chlorinated graphene oxide and 2 mL of hexamethylenediamine were heated at 60 °C under the protection of nitrogen. After 72 hours of reaction, the heat source was removed and cooled to room temperature. Then the reacted graphene oxide is extracted to obtain amino-functionalized blue fluorescent graphene oxide. 50 mmol of zinc nitrate was dissolved in 40 mL of deionized water, and then 6 mmol of manganese acetate was dissolved in the above solution, ultrasonically dissolved completely, and then refluxed with dry nitrogen for 0.5 h to remove oxygen in the solution. Dissolve 50 mmol of sodium sulfide in 10 mL of deionized water, add drop by drop to the above boiling mixture, reflux and vigorously stir for 2 h. After cooling, centrifuge to obtain manganese-doped zinc sulfide nanocrystals, and ultrasonically disperse them in water. Then about 0.1 g of nanocr...

Embodiment 2

[0038] 1. Preparation of functionalized luminescent graphene oxide and manganese-doped nanocrystals

[0039] 1 mg of acyl-chlorinated graphene oxide and 2 mL of ethylenediamine were heated at 60 °C under the protection of nitrogen. After 48 hours of reaction, the heat source was removed and cooled to room temperature. Then the reacted graphene oxide is extracted to obtain amino-functionalized blue fluorescent graphene oxide. 10 mmol of zinc nitrate was dissolved in 40 mL of deionized water, and then 0.5 mmol of manganese acetate was dissolved in the above solution, sonicated to dissolve completely, and then refluxed with dry nitrogen for 1 h to remove oxygen in the solution. Dissolve 10 mmol of sodium sulfide in 10 mL of deionized water, add dropwise to the above boiling mixture, reflux and vigorously stir for 3 h. After cooling, centrifuge to obtain manganese-doped zinc sulfide nanocrystals, and ultrasonically disperse them in water. Then about 0.1 g of nanocrystals were di...

Embodiment 3

[0045] 1. Preparation of functionalized luminescent graphene oxide and manganese-doped nanocrystals

[0046] 2 mg of acyl-chlorinated graphene oxide and 2 mL of ethylenediamine were heated at 60 °C under the protection of nitrogen. After 48 hours of reaction, the heat source was removed and cooled to room temperature. Then the reacted graphene oxide is extracted to obtain amino-functionalized blue fluorescent graphene oxide. 5 mmol of zinc nitrate was dissolved in 40 mL of deionized water, and then 7.5 mmol of manganese acetate was dissolved in the above solution, ultrasonically dissolved completely, and then refluxed with dry nitrogen for 1 h to remove oxygen in the solution. Dissolve 5 mmol of sodium sulfide in 10 mL of deionized water, add drop by drop to the above boiling mixture, reflux and vigorously stir for 4 h. After cooling, centrifuge to obtain manganese-doped zinc sulfide nanocrystals, and ultrasonically disperse them in water. Then about 0.1 g of nanocrystals we...

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Abstract

The invention discloses a two-color nanocomposite with two-color ratio fluorescence, and also discloses a fluorescent paper sensor for visual analysis and detection of trace amounts of explosive TNT (TNT) residues on the surface of different objects and a preparation method thereof. The paper sensor prepared by the invention is easy to carry and operate, and is convenient for real-time online on-site visual detection of explosive TNT, and can visually detect traces of TNT residues with a lower limit as low as 11.35 nanograms per square millimeter. The method of the present invention can avoid the use of large-scale instruments to a certain extent, and only needs a hand-held ultraviolet lamp to carry out visual detection. The operation is simple, convenient and fast, with high sensitivity and remarkable effect; The interference of substances, good selectivity, but also omitted the pretreatment process. The prepared paper sensor can detect explosive TNT in real-time and on-site visualization.

Description

technical field [0001] The present invention relates to a fluorescent chemical sensor and a preparation method thereof, in particular to a fluorescent paper sensor for visual analysis and detection of trace amounts of explosive TNT (TNT) residues on the surface of different objects and a preparation method thereof. A sensor for the visual detection of TNT by the two-color ratio fluorescence signal of blue-light graphene oxide and red-light dream-doped nanocrystals and its preparation method. Background technique [0002] Explosives endanger national security and social stability, especially terrorist attacks using explosives TNT (TNT) occur frequently around the world, posing a great threat to the safety of civilian life and property. Therefore, how to detect hidden explosives has become an urgent task faced by relevant departments of various countries. Due to the variety of concealment methods and strategies, it has brought a lot of inconvenience to the detection work. In ...

Claims

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Application Information

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