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Preparation of ferroferric oxide/gold nanometer composite material and method for rapidly detecting rhodamine molecules by using ferroferric oxide/gold nanometer composite material

A technology of ferroferric oxide and composite materials, which is applied in the preparation and application of surface Raman-enhanced substrates, can solve the problems of harsh experimental detection conditions, food health threats, cumbersome operations, etc., and is beneficial to the separation of test objects, detection Ease of operation and high sensitivity

Inactive Publication Date: 2015-06-03
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, it is also used as a food additive. Since later experiments proved that rhodamine can cause cancer, it is now not allowed to be used in the field of food dyeing, but some unscrupulous traders still use it as a substitute for Sudan Red. People's dietary health poses a great threat. At the same time, with the variety of food types, the requirements for experimental detection conditions have also become very harsh.
[0003] At present, the methods for detecting rhodamine mainly include liquid chromatography detection and Raman-enhanced detection. Among them, there are many substrates for Raman detection. For example, pure gold nanomaterials are used as substrates to detect rhodamine, but the cost is high and the operation is relatively cumbersome.

Method used

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  • Preparation of ferroferric oxide/gold nanometer composite material and method for rapidly detecting rhodamine molecules by using ferroferric oxide/gold nanometer composite material
  • Preparation of ferroferric oxide/gold nanometer composite material and method for rapidly detecting rhodamine molecules by using ferroferric oxide/gold nanometer composite material
  • Preparation of ferroferric oxide/gold nanometer composite material and method for rapidly detecting rhodamine molecules by using ferroferric oxide/gold nanometer composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1, a kind of preparation method of ferric oxide / gold nanocomposite, comprises the following steps:

[0031] Step 1: Prepare iron ferric oxide nanoparticles by hydrothermal method: respectively dissolve 1.0g ferric chloride hexahydrate, 4.0g anhydrous sodium acetate and 2ml ethylenediamine in 30ml ethylene glycol, stir vigorously for 30min, then transfer to In a polytetrafluoroethylene-lined reactor, react at 200°C for 7 hours, and the obtained product is washed several times with deionized water and ethanol magnetic separation method, and is ready for use;

[0032] Step 2: Wrap a layer of silicon dioxide on the surface of ferric oxide nanoparticles: Weigh 0.4g of ferric oxide nanomaterials prepared in step 1 and dissolve them in 120ml absolute ethanol, 30ml water and 2ml with a mass concentration of 28%. In the mixed solution of ammonia water, add 0.2ml tetraethyl orthosilicate (TEOS) after ultrasonic 30min, react 10h at room temperature; Thereby wrap a layer...

Embodiment 2

[0041] Embodiment 2, utilize the Fe that embodiment 1 prepares 3 o 4 -SiO2-Au nanoparticles are used as the SERS substrate, the saturation magnetization of the SERS substrate material is 50emu / g, the rhodamine molecule is used as the Raman probe molecule, and the detection of the rhodamine molecule content includes the following steps:

[0042] Step 1. Separately mix the SERS base material with 10 -8 、10 -7 m, 10 -6 、10 -5 、10 -4 The rhodamine solution with a mol / l concentration is fully mixed, and the SERS substrate material with Raman probe molecules adsorbed on the surface is separated by a magnetic separation method, and coated on a glass slide to dry to prepare a test sample for use;

[0043] Step 2. Place the detection sample prepared in step 1 in a laser Raman spectrometer, wherein the frequency range is 2500 cm -1 —0cm -1 , the wavelength is 532nm, and the laser attenuation power is 0.01-0.05%. In the continuous mode, the Raman detection of rhodamine is complete...

Embodiment 3

[0044] Embodiment 3, a preparation method of ferric oxide / gold nanocomposite material, compared with embodiment 1, the difference is only in step 9, repeat step 8 and continue to add the reduced gold salt solution—stir evenly— Then add 0.1ml formaldehyde—react 10 minutes for 10 times.

[0045] Because, compared with Example 1, embodiment 3 increases the reduction gold salt solution—stirs uniformly—adds 0.1ml formaldehyde—the number of operations of reaction 10min, so that the reduction reaction occurs repeatedly, therefore, the final obtained Fe 3 o 4 -SiO 2 - The loading amount of the gold nanoparticles on the surface of the Au nanoparticles is increased compared to Example 1.

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Abstract

The invention discloses a method for rapidly detecting rhodamine molecules by using a ferroferric oxide / gold nanometer composite material. The method comprises the following steps: mechanically mixing the rhodamine molecules serving as probe molecules and the ferroferric oxide / gold nanometer composite material serving as an SERS (Surface Enhanced Raman Scattering) substrate with probe molecules of different concentrations for a certain time period; separating a substrate material of which the surface adsorbs the probe molecules out with a magnetic separation method; coating the substrate material on a glass slide, and airing for use in Raman detection. Meanwhile, the invention further provides preparation of the ferroferric oxide / gold nanometer composite material. The ferroferric oxide / gold nanometer composite material has the rapid magnetic response of ferroferric oxide, so that the detection of rhodamine by taking a pure gold nanometer material as the substrate is simplified, and the detection limit can be up to the order of magnitude 10<-8>. The SERS substrate has a wide application prospect in the fields of foods additives, heavy metal detection and the like.

Description

technical field [0001] The invention belongs to the preparation and application of nanocomposite materials in the field of surface Raman enhancement, and relates to the preparation and application of a surface Raman enhancement (SERS) substrate for rapid detection of rhodamine molecules. Background technique [0002] Rhodamine is a kind of artificial synthetic dye with bright pink color, which is a non-food raw material. It has been used in the fields of cell fluorescence staining in the laboratory, colored glass, special fireworks and firecrackers. In addition, it is also used as a food additive. Since later experiments proved that rhodamine can cause cancer, it is now not allowed to be used in the field of food dyeing, but some unscrupulous traders still use it as a substitute for Sudan Red. People's dietary health poses a great threat. At the same time, with the variety of food, the requirements for its experimental detection conditions have also become very harsh. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/02G01N21/65B82Y30/00
Inventor 李方于治芳薛涛
Owner TIANJIN UNIV
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