A kind of plasmonic metal-semiconductor composite film and its preparation method and its application in the detection of non-food coloring

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, high sensitivity, reproducibility and stability.

Active Publication Date: 2021-04-20
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of plasmonic metal-semiconductor composite film and its preparation method and its application in the detection of non-food coloring
  • A kind of plasmonic metal-semiconductor composite film and its preparation method and its application in the detection of non-food coloring
  • A kind of plasmonic metal-semiconductor composite film and its preparation method and its application in the detection of non-food coloring

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: 100 μL of 10 mM 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 for...

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 and its preparation method and its application in the detection of non-edible pigments, belonging to the technical field of spectral analysis. The main content of the present invention includes the preparation of plasma metal film and semiconductor material, by covering plasma metal film Au@Ag NP film with semiconductor ZnGeO:Sr NRs to prepare Au@Ag NP film@PLMs composite film, the plasma metal-semiconductor structure can be significantly enhanced SERS signal, so as to realize the detection of non-food coloring in food. The plasma metal-semiconductor composite film prepared by the invention can effectively amplify the SERS signal of the analyte, and has high accuracy and 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 Patents(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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