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Photonic crystal sensing material and its preparation method and application

A technology for photonic crystals and sensing materials, which is applied in the direction of material analysis, analysis materials, instruments, etc. by optical means, which can solve the difficulty in preparing molecularly imprinted photonic crystal polymers, limit the research and application of photonic crystals, and prepare photonic crystals. Complex problems, etc., to achieve the effect of improving the diffracted light intensity signal, improving the detection sensitivity, and simple preparation method

Active Publication Date: 2021-04-13
INST OF ENVIRONMENTAL MEDICINE & OCCUPATIONAL MEDICINE ACAD OF MILITARY MEDICINE ACAD OF MILITARY SCI
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Problems solved by technology

[0004] However, the preparation methods of these photonic crystals are very complicated, especially for some targets (such as aflatoxin B1, biological macromolecules, etc.), it is difficult to prepare molecularly imprinted photonic crystal polymers, or the imprinting efficiency is too low, resulting in An effective response signal cannot be obtained; while aptamers are aggregated on photonic crystals to form cross-links, a large number of aptamers are required, and the high price of aptamers limits the further research and application of this photonic crystal.

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  • Photonic crystal sensing material and its preparation method and application

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preparation example Construction

[0022] The first aspect of the present invention provides a kind of preparation method of photonic crystal sensing material, and this preparation method comprises:

[0023] (1) In the presence of the first organic solvent and ammonia water, hydrolyze tetraethyl orthosilicate, remove the first organic solvent and remaining ammonia water, centrifugally sieve the particle size, and obtain silicon spheres;

[0024] (2) In the presence of the first organic solvent, the silicon spheres are mixed with 3-aminopropyltriethoxysilane, and after ultrasonication, nitrogen filling and deoxygenation, stirring reaction is carried out to obtain amide silicon spheres;

[0025] (3) carrying out a contact reaction with the aqueous solution of the silicon amides spheres and the nano metal solution to obtain the silicon amides spheres modified with the nano metal particles;

[0026] (4) stacking the silicon amide spheres of the modified nano-metal particles to obtain a photonic crystal;

[0027] (...

Embodiment 1

[0050] (1) Add 150mL of absolute ethanol and 9mL of ammonia water into a clean and dry flask and mix evenly, then add 7.2mL of tetraethyl orthosilicate (TEOS), stir vigorously at 30°C, rotate at 600rpm, and react for 9 hours; After the end, the remaining ammonia and absolute ethanol are removed by centrifugation (rotating speed 4000rpm), then redispersed in absolute ethanol, and the particle size is sieved by centrifugation (800rpm takes the supernatant, 1500rpm takes the precipitate), and finally the prepared Colloidal particles (silicon spheres) are dispersed in 10mL of absolute ethanol;

[0051] (2) Take 1 mL of the synthesized silicon sphere and dilute it to 10 mL with absolute ethanol, put it in a 50 mL flask, add 200 μL of 3-aminopropyltriethoxysilane (APTES) and sonicate for 5 minutes, then fill with nitrogen and deoxygenate for 30 minutes , and finally mechanically stirred at 70°C for 6 hours, washed with ethanol for 3 times after the reaction was completed, to obtain ...

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Abstract

The invention discloses a photonic crystal sensing material and its preparation method and application. The preparation method comprises: hydrolyzing tetraethyl orthosilicate in the presence of a first organic solvent and ammonia water to remove the first The organic solvent and the remaining ammonia water were centrifuged to sieve the particle size to obtain silicon spheres; in the presence of the first organic solvent, the silicon spheres were mixed with 3-aminopropyltriethoxysilane, and after ultrasonication, nitrogen filling and deoxygenation, the Stirring and reacting to prepare silicon amides; contacting the aqueous solution of silicon amides with the nano-metal solution to obtain silicon amides modified with nano-metal particles; stacking the silicon amides modified with nano-metals, A photonic crystal is prepared; the photonic crystal is combined with an identification element to prepare the photonic crystal sensing material. As the atrazine detection material, the photonic crystal sensing material of the invention has simple operation, no need of any pretreatment, high detection sensitivity and wide detection range.

Description

technical field [0001] The invention belongs to the field of pesticide detection, and more specifically relates to a photonic crystal sensing material and its preparation method and application. Background technique [0002] Photonic crystals (PC) are dielectric materials with different dielectric constants arranged in a certain periodic order in space to form an ordered periodic structure material with light wavelength order. When light propagates in photonic crystals, Bragg diffraction will occur, and the diffraction wavelength follows the following law: mλ=2ndsinθ. It is this kind of diffraction that makes photonic crystals have unique structural colors. If the lattice parameters of photonic crystals change, the diffraction wavelength will change. Therefore, as a sensing material, photonic crystals can realize rapid detection without reagents and labels. [0003] To realize the specific detection of the target, it is necessary to modify the recognition elements on the ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/47
CPCG01N21/4788
Inventor 白家磊彭媛宁保安王江李双宋艳秋高志贤
Owner INST OF ENVIRONMENTAL MEDICINE & OCCUPATIONAL MEDICINE ACAD OF MILITARY MEDICINE ACAD OF MILITARY SCI
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