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Plasma metal-semiconductor composite film, preparation method thereof and application of plasma metal-semiconductor composite film in non-edible pigment detection

A plasma metal, food coloring technology, applied in the field of spectral analysis, can solve problems such as human health threats, and achieve good sensitivity and repeatability, Raman signal enhancement, reproducibility and stability.

Active Publication Date: 2020-09-18
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many kinds of industrial dyes, some unscrupulous traders can’t resist the temptation of profit, and illegally use some industrial dyes instead of food coloring to add to food, thus posing a serious threat to human health

Method used

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  • Plasma metal-semiconductor composite film, preparation method thereof and application of plasma metal-semiconductor composite film in non-edible pigment detection
  • Plasma metal-semiconductor composite film, preparation method thereof and application of plasma metal-semiconductor composite film in non-edible pigment detection
  • Plasma metal-semiconductor composite film, preparation method thereof and application of plasma metal-semiconductor composite film in non-edible pigment detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of preparation that is used for the plasma metal-semiconductor composite membrane that non-food coloring detects, described preparation method comprises the steps:

[0037] (1) Preparation of Au@Ag NP film: 100μL of 10mM AgNO 3 The solution was added to 4 mL of 15 nm Au NPs solution. Next, under stirring, inject 150 μL of 38.8 mM sodium citrate and 40 μL of 0.1 M AA into the mixture and stir for 15 min. After centrifugation, the Au@Ag NPs were redispersed in 2 mL of ultrapure water. 300 μL of hexane was added to the surface of 1.5 mL of Au@Ag NPs aqueous solution to form an immiscible water-hexane interface, and ethanol was added dropwise to the surface of the water-hexane layer. Finally the membrane is carefully transferred to a silicon wafer.

[0038] (2) Preparation of ZnGeO:Sr NRs: 2.1mmol Zn(NO 3 ) 2, 0.0055mmol Sr(NO 3 ) 3 , with 350 μl concentrated HNO 3 It was mixed under vigorous stirring, and 11.5 mL of ultrapure water was added thereto to form ...

Embodiment 2

[0042] A kind of preparation that is used for the plasma metal-semiconductor composite membrane that non-food coloring detects, described preparation method comprises the steps:

[0043] (1) Preparation of Au@Ag NP film: 200μL of 10mM AgNO 3 The solution was added to 5 mL of 15 nm Au NPs solution. Next, under stirring, inject 200 μL of 38.8 mM sodium citrate and 50 μL of 0.1 M AA into the mixture and stir for 15 min. After centrifugation, the Au@Ag NPs were redispersed in 2 mL of ultrapure water. 400 μL of hexane was added to the surface of 2 mL of Au@AgNPs aqueous solution to form an immiscible water-hexane interface, and ethanol was added dropwise to the surface of the water-hexane layer. Finally the membrane is carefully transferred to a silicon wafer.

[0044] (2) Preparation of ZnGeO:Sr NRs: 2mmol Zn(NO 3 ) 2 , 0.005mmol Sr(NO 3 ) 3 , with 300 μl concentrated HNO 3 It was mixed under vigorous stirring, and 11 mL of ultrapure water was added thereto to form a color...

Embodiment 3

[0048] A kind of preparation that is used for the plasma metal-semiconductor composite membrane that non-food coloring detects, described preparation method comprises the steps:

[0049] (1) Preparation of Au@Ag NP film: 300μL of 10mM AgNO 3 The solution was added to 6 mL of 15 nm Au NPs solution. Next, under stirring, inject 250 μL of 38.8 mM sodium citrate and 60 μL of 0.1 M AA into the mixture and stir for 15 min. After centrifugation, the Au@Ag NPs were redispersed in 2 mL of ultrapure water. 500 μL of hexane was added to the surface of 2.5 mL of Au@Ag NPs aqueous solution to form an immiscible water-hexane interface, and ethanol was added dropwise to the surface of the water-hexane layer. Finally the membrane is carefully transferred to a silicon wafer.

[0050] (2) Preparation of ZnGeO:Sr NRs: 2.2mmol Zn(NO 3 ) 2 , 0.006mmol Sr(NO 3 ) 3 , with 400 μl concentrated HNO 3 Mix under vigorous stirring, and add 12 mL of ultrapure water thereto to form a colorless and t...

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Abstract

The invention provides a plasma metal-semiconductor composite film, a preparation method thereof and application of the plasma metal-semiconductor composite film in non-edible pigment detection, and belongs to the technical field of spectral analysis. The preparation method mainly comprises the following steps of: preparing a plasma metal film and a semiconductor material; and covering a plasma metal film Au@Ag NP film with a semiconductor ZnGeO:Sr NRs to prepare an Au@Ag NP film@PLMs composite film, wherein the plasma metal-semiconductor structure can significantly enhance SERS signals, so that the detection of non-edible pigments in food is realized. The prepared plasma metal-semiconductor composite film can effectively amplify SERS signals of an analyte, and has relatively high accuracyand sensitivity.

Description

technical field [0001] The invention belongs to the technical field of spectral analysis, and in particular relates to a plasma metal-semiconductor composite film, a preparation method thereof and its application in the detection of non-edible pigments. Background technique [0002] Industrial dyes generally refer to various dyes used for coloring in industrial production, such as coloring textiles, fur products, wood products and ceramic products. There are many kinds of industrial dyes, and some unscrupulous traders cannot resist the temptation of profits, and illegally use some industrial dyes instead of food colorings to add to food, thus posing a serious threat to human health. Industrial dyes that are widely known for being illegally added to food include Sudan Red, Rhodamine B, and Basic Bright Yellow. It is harmful to the human body, and many of them can even cause "three causes" (teratogenic, carcinogenic, and mutagenic). [0003] Usually, SERS technology uses pla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/00G01N21/65
CPCG01N21/65G02B5/008
Inventor 赵媛郑芳杰施丽霞
Owner JIANGNAN UNIV
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