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Flexible light-transmitting metamaterial composite film and method for detecting nitrite

A nitrite and composite thin film technology, which is applied in the direction of material analysis, material analysis, material excitation analysis by optical means, can solve the problems of rapid detection of discomfort, complicated operation process, etc., and achieves fast detection speed, high sensitivity, and improved The effect of detection sensitivity

Inactive Publication Date: 2018-06-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The national standard for the determination of nitrite content (naphthalene ethylenediamine hydrochloride method) has the advantages of high accuracy and precision, but the operation process is complicated and requires special instruments, which is not suitable for rapid on-site detection
At present, although there are some reports on the rapid detection technology of nitrite content, the accuracy and sensitivity need to be further improved.

Method used

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  • Flexible light-transmitting metamaterial composite film and method for detecting nitrite
  • Flexible light-transmitting metamaterial composite film and method for detecting nitrite
  • Flexible light-transmitting metamaterial composite film and method for detecting nitrite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment one (as figure 2 Shown): Air / liquid interface self-installation method

[0054] (1) Cleaning of the hard substrate 4: the glass sheet, silicon sheet or metal sheet is ultrasonically cleaned with water, acetone, and water, and then dried.

[0055] (2) Preparation of metamaterial layer: Synthesize metal nanoparticle sol 10 of various materials, sizes and shapes by wet chemical method, and then transfer the metal nanoparticles dispersed in the aqueous phase to an organic solvent, the specific method is as follows : Mix 5mL metal nanoparticle sol with chloroform solution dissolved with 0.1mg / mL mercapto-polyethylene glycol (average molecular weight 5000); after the solution is layered, quickly add 1mL methanol to the aqueous phase to induce metal nanoparticle transfer into chloroform solution; the obtained metal nanoparticles dispersed in chloroform were washed repeatedly to remove excess mercapto-polyethylene glycol in the solution, and concentrated into 50 μL...

Embodiment 2

[0059] Embodiment two (as image 3 Shown): Liquid / liquid interface self-installation method

[0060] Metal nanoparticle arrays can also be prepared by self-assembly at the liquid / liquid interface, and the specific operation is as follows: in a container 9, mix 5mL metal nanoparticle sol 10 and 5mL toluene 11; after the solution is separated, use a syringe pump 6 and a syringe to 7. Inject 12 mL of hexanol into the metal sol at a rate of 100 μL / min, which can induce the metal nanoparticles to form a closely arranged metal nanoparticle array 8 at the interface of the toluene / water phase, which can be scooped out from the cleaned hard substrate 4 and wait for After completely drying, a metamaterial material layer 2 (such as Figure 4 shown), and the rest of the steps are the same as above (3)-(4).

[0061] The metal nanostructure in the metamaterial layer can generate surface plasmon resonance under the excitation of visible / near-infrared light, and under the synergy with the n...

Embodiment 3

[0062] Example 3: Detection of nitrous acid in liquid samples

[0063] Such as Figure 7 As shown, add 1 μL of 1M hydrochloric acid to 20 μL of the liquid sample 12 to be tested, place the sample 12 evenly on the above-mentioned film after mixing, collect visible / near-infrared band laser 13 as a light source, and use Raman spectrometer 14 and optical fiber 15 collects the Raman spectrum of film surface, can measure the nitrite content in the liquid sample 12 (see Figure 8 ). The above detection method has high selectivity and anti-interference ability (see Figure 9 ).

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Abstract

The invention discloses a flexible light-transmitting metamaterial composite film and method for detecting nitrite. A single layer of metal nanoparticle array is formed on a soft light-transmitting substrate as a metamaterial layer, and a p-aminothiophenol self-assembled monomolecular film covers the single layer of metal nanoparticle array as a nitrite sensitive film; under the excitation of visible / near infrared light, surface plasmon resonance is generated on the metamaterial layer; p-aminothiophenol in the nitrite sensitive film is induced to be converted into an azobenzene compound underthe synergistic action of surface ions of the metamaterial layer and sub-salt nitrate ions; since the molecules of the azobenzene compound and the molecules of the p-aminothiophenol have a significantdifference in the aspect of Raman spectrum, the reaction is directly monitored by using the Raman spectrum, and the specific recognition and detection of nitrite ions are indirectly realized. The method utilizes the special optical properties possessed by the metamaterial and combines the surface selectively of sub-salt nitric acid to catalyze aniline so as to generate the azobenzene, thereby realizing the rapid detection of nitrite.

Description

technical field [0001] The invention relates to a detection film and a method for making and using it, in particular to a flexible light-transmitting supermaterial composite film and a method for detecting nitrite. Background technique [0002] Nitrite is a harmful substance widely present in animal and plant foods. Nitrate rich in vegetables and meat will also be converted into nitrite under the action of reductase when pickled, stored or processed improperly. At the same time, because nitrite has color development and antiseptic preservation effects on meat products, it is often used as an additive to make meat products color and enhance flavor, and its antibacterial and antiseptic effects can also extend the shelf life. However, nitrite can oxidize human hemoglobin and lose the ability to transport oxygen, causing chronic and acute poisoning. It can also react with secondary amine compounds in food and in the human body to form highly carcinogenic nitrosamine compounds. ...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 刘湘江应义斌
Owner ZHEJIANG UNIV
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