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Fluorescent sensor based on cellulose nanometer micro-fiber (TOCN) film serving as substrate and application thereof

A fluorescence sensor and nano-fiber technology, applied in the direction of fluorescence/phosphorescence, material excitation analysis, etc., can solve the problems such as glass sheet and quartz sheet are not easy to carry, difficult to control the film thickness, pollute the system to be tested, etc., and achieve reusable portable , the effect of suppressing π-π stacking and improving detection sensitivity

Inactive Publication Date: 2012-10-03
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0007] The spin coating method is a common method for preparing conjugated polymer sensing films, but there are some shortcomings in the preparation of films and processes by the traditional spin coating method that affect its practical application, such as the difficulty in controlling the thickness of the film, and the glass sheet used as the carrier , quartz sheets, etc. are not easy to carry, and there are also problems with chemical stability and thermal stability, especially when used in organic solutions, they are prone to cracking or being dissolved, polluting the system to be tested, etc.

Method used

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  • Fluorescent sensor based on cellulose nanometer micro-fiber (TOCN) film serving as substrate and application thereof
  • Fluorescent sensor based on cellulose nanometer micro-fiber (TOCN) film serving as substrate and application thereof
  • Fluorescent sensor based on cellulose nanometer micro-fiber (TOCN) film serving as substrate and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) Weigh 0.1g TEMPO and 1gNaBr into 500mL deionized water, stir fully at room temperature; after TEMPO and NaBr are completely dissolved, add 10g wet wood pulp cellulose (the mass fraction of cellulose is 20.15%) to the reaction system After the cellulose is dispersed evenly, add 20g of NaClO solution to the system, and control the pH value of the reaction system in the range of 10 to 10.5; pH value of the system, until the NaOH solution is no longer consumed, the reaction is over; filter in a sand core funnel, and wash 3 to 5 times to prepare oxidized cellulose; supernatant and centrifuge the prepared oxidized cellulose, and take the upper layer Clear liquid, obtain TOCN solution. Ultrasonic defoaming of the TOCN aqueous suspension to obtain a casting solution, wherein the mass fraction of TOCN is 0.2% to 0.3%; the resulting casting solution is poured into a polytetrafluoroethylene mold, and after standing for 10min to 1h, put it in 30 Place in an oven at ~70°C for 6...

Embodiment 2

[0034](1) Ultrasonic defoaming of the TOCN aqueous suspension to obtain a casting solution, wherein the mass fraction of TOCN is 0.2% to 0.3%; the resulting casting solution is poured into a mold made of polytetrafluoroethylene, and left to stand for 10min to 1h Finally, put it in an oven at 30-70°C for 6-10 hours, and get a TOCN film after the solvent is completely evaporated.

[0035] (2) Put the TOCN film into the morpholine ethanesulfonic acid buffer solution with a pH of 4 to 7, add the condensing agent 1-(3-dimethylaminopropyl)-3-ethylcarbodiamine / N-hydroxy The molar ratio of succinimide is 2:1. After 30 minutes, add the DMF solution of p-bromoaniline. After reacting for 16 hours, wash with water and ethanol repeatedly, and vacuum-dry the obtained film to obtain a TOCN active film capable of Suzuki reaction.

[0036] (3) Dissolve 3,6-dibromocarbazole and 9,9-dihexylfluorene-2,7-diborate in tetrahydrofuran at a molar ratio of 1:1, and add 1 to 3 mol / L of K 2 CO 3 Aque...

Embodiment 3

[0040] (1) Ultrasonic defoaming of the TOCN aqueous suspension to obtain a casting solution, wherein the mass fraction of TOCN is 0.2% to 0.3%; the resulting casting solution is poured into a mold made of polytetrafluoroethylene, and left to stand for 10min to 1h Finally, put it in an oven at 30-70°C for 6-10 hours, and get a TOCN film after the solvent is completely evaporated.

[0041] (2) Put the TOCN film into the morpholine ethanesulfonic acid buffer solution with a pH of 4 to 7, add the condensing agent 1-(3-dimethylaminopropyl)-3-ethylcarbodiamine / N-hydroxy The molar ratio of succinimide is 2:1. After 30 minutes, add the DMF solution of p-bromoaniline. After reacting for 16 hours, wash with water and ethanol repeatedly, and vacuum-dry the obtained film to obtain a TOCN active film capable of Suzuki reaction.

[0042] (3) Dissolve 3,6-dibromocarbazole and 9,9-dihexylfluorene-2,7-diborate in tetrahydrofuran at a molar ratio of 1:1, and add 1 to 3 mol / L of K 2 CO 3 Aqu...

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Abstract

The invention relates to a fluorescent chemical sensor for detecting a nitro-aromatic explosive in an ultra-trace way. A fluorescent conjugated polymer is chemically grafted by taking a cellulose nanometer micro-fiber (TOCN) film as a carrier. A preparation method of the sensor comprises the following steps of: preparing a TOCN film of which the C-6 bit is carboxyl by oxidizing cellulose with a 2,2,6,6-tetramethyl piperidine oxide; chemically bonding an amine compound of which the terminal is provided with bromophenyl onto the surface of the film; and introducing a prepared fluorescent conjugated polymer onto the surface of the film through a 'grafting to' technology. According to the invention, hypersensitization of the film sensor is realized, the problems of stability and permeability of the film sensor are solved, and the diffusion pore diameter is up to 97.4 percent. A fluorescent sensing film prepared with the method has the advantages of high mechanical property, high flexibility, easiness for carrying, environment friendliness, renewability and the like, can be used for conveniently detecting nitro-aromatic explosives, and can be used for visually detecting nitro-aromatic explosives under an ultraviolet lamp.

Description

technical field [0001] The invention relates to a high-sensitivity fluorescent conjugated polymer chemical sensor, in particular to a preparation method for a fluorescent conjugated polymer film sensitive to nitroaromatic explosives. Background technique [0002] Since entering the 21st century, reliable and accurate detection of explosives has become one of the important issues of international concern. The ultra-trace detection of chemical explosives plays an important role in maintaining national security, preventing and controlling environmental pollution and forensic science. Due to the increasing threat of international terrorism, finding new methods for detecting explosives with high sensitivity and high selectivity has become a research hotspot at home and abroad. [0003] In recent years, the application of fluorescent conjugated polymers to detect ultra-trace nitroaromatic explosives has received great attention. One of the important reasons is that when an elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08J5/18C08L1/02C08L1/04G01N21/64
Inventor 吴文辉牛庆媛杨博穆瑞花洪东峰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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