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Cucurbituril subject-object based chemical nano structure membrane and preparation method and application thereof

A nanostructure and cucurbituril technology, applied in the field of functional nano-film materials, can solve the problems of few direct detection methods and unsatisfactory detection results, and achieve the effects of easy processing into devices, low cost of raw materials, and high recognition ability

Inactive Publication Date: 2010-08-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, other explosives such as dinitrotoluene (DNT), pentaerythritol tetranitrate (PETN), cyclotetramethylene tetranitramine (HMX) and cyclotrimethylenetrinitramine (RDX) are directly detected based on fluorescence methods. There are not many methods, and the detection effect is not ideal. Therefore, the detection method and detection performance of nitro-containing explosives need to be further improved and improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Preparation of nanostructured film based on cucurbituril host-guest chemistry

[0023] 1) Get 100 μl mass fraction of 0.1% chitosan solution (chitosan molecular weight is 10KDa, deacetylation is 95%), spread it on the clean quartz plate that size is 3cm * 0.9cm * 0.1cm, naturally Wipe dry;

[0024] 2) Soak the modified quartz slice in 8ml aqueous solution containing 0.05mM cucurbituril and 0.05mM naphthalene dye molecules, take it out after 30min, and dry it with nitrogen gas.

[0025] The obtained nanostructured film based on cucurbitacin host-guest chemistry can detect TNT, DNT, PETN, HMX, RDX and other atmospheres at room temperature, and the detection limits are: TNT is 10ppb, DNT is 180ppb, PETN is 23ppt, and RDX is 7ppt , HMX is 0.15ppt.

Embodiment 2

[0026] Example 2 Preparation of nanostructured film based on cucurbituril host-guest chemistry

[0027] 1) Take 200 μl of O-carboxymethyl chitosan solution with a mass fraction of 0.5% (the molecular weight of O-carboxymethyl chitosan is 100KDa, deacetylation is 91%), and spread it on a 5cm×1.5 cm×0.1cm clean silicon wafer, evaporated to dry naturally;

[0028] 2) Soak the modified silicon chip in 12 ml of aqueous solution containing 0.1 mM cucurbituril and 0.1 mM α-naphthol dye molecules, take it out after 1 hour, and dry naturally.

[0029] The obtained nanostructured film based on cucurbitacin host-guest chemistry can detect TNT, DNT, PETN, HMX, RDX and other atmospheres at room temperature, and its detection limit is the same as that described in Example 1.

Embodiment 3

[0030] Example 3 Preparation of nanostructured film based on cucurbituril host-guest chemistry

[0031] 1) Take 150 μl of carboxymethylated amino sugar solution with a mass fraction of 0.3%, spread it on a clean glass sheet with a size of 4cm×1.2cm×0.1cm, and evaporate it to dry naturally;

[0032] 2) Soak the modified glass slide in 10ml aqueous solution containing 0.01mM cucurbituril and 0.01mM β-naphthol dye molecules, take it out after 20min, and dry it with nitrogen gas.

[0033] The obtained nanostructured film based on cucurbitacin host-guest chemistry can detect TNT, DNT, PETN, HMX, RDX and other atmospheres at room temperature, and its detection limit is the same as that described in Example 1.

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Abstract

The invention relates to a cucurbituril subject-object based chemical nano structure membrane. Chitosan solution is adopted to modify substrate, mutual action of cucurbituril and chitosan and hydrophobic effect of cucurbituril are utilized to fix dye molecule on the surface of the modified substrate, thus obtaining the nano structure membrane. The nano structure membrane of the invention has highselectivity and high sensitivity on nitro-containing explosive molecule, and preparation method is simple, cost is low, and the nano structure membrane is easy to be processed into device. The invention can be used for detecting trace of nitro-containing explosives including TNT, DNT, PETN, HMX and RDX and provides technical support for national security detection.

Description

technical field [0001] The invention relates to a nanostructure film, in particular to a nanostructure film based on cucurbituril host-guest chemistry, a preparation method and application thereof, and belongs to the field of functional nanofilm materials. Background technique [0002] Explosives, as one of the important chemicals that endanger social and environmental safety, have been highly valued by various countries. With the increase of explosive terrorist attacks, the rapid detection of explosives has become an important topic in the field of analysis and detection. As a highly sensitive analytical method, fluorescence analysis is widely used in the detection of explosives. Find through literature search, Timothy M.Swager group published in 1998 in "Journal of the Americanchemical society" (1998 120 volumes 11864 pages) paper "Fluorescent PorousPolymer Films as TNT Chemosensors: Electronic and Structural Effects" (fluorescence porous polymer Thin films as TNT chemic...

Claims

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Application Information

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IPC IPC(8): B82B1/00B82B3/00G01N21/64
Inventor 李广涛朱伟
Owner TSINGHUA UNIV
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