Magnetic composite microspheres with Raman-enhanced characteristic as well as preparation method and application thereof

A technology of magnetic composite microspheres and characteristics, applied in the direction of microsphere preparation, Raman scattering, microcapsule preparation, etc., to achieve the effects of fast magnetic response, uniform particle size distribution, and significantly good Raman signal

Inactive Publication Date: 2014-02-12
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Combining the advantages of SERS technology analysis and detection, the development and preparation of SERS active substrates that have affinity with persistent organic pollutants, and at the same time prepare simple, easy-to-operate, and signal-stable SERS active substrates have become a research hotspot in this field in recent years; so far, there have been no related reports

Method used

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  • Magnetic composite microspheres with Raman-enhanced characteristic as well as preparation method and application thereof
  • Magnetic composite microspheres with Raman-enhanced characteristic as well as preparation method and application thereof
  • Magnetic composite microspheres with Raman-enhanced characteristic as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 Prepare a core-shell Fe with a magnetic core of about 180 nm, a carbon layer thickness of about 20 nm, and a silver nanoparticle shell of about 5 nm. 3 o 4 CAg microspheres and their application to detect different concentrations of PCP solutions

[0025] (1) Preparation of Fe 3 o 4 C

[0026] Dissolve 0.5g of ferrocene in 35mL of acetone, add 2.0mL of hydrogen peroxide while stirring magnetically, and then place it in a stainless steel autoclave with Teflon lining, and place the autoclave in an oven at 220°C for 24h. Take it out, let it cool to room temperature with tap water; separate the product by magnetic separation, wash with acetone and absolute ethanol to remove unreacted reactants, and finally disperse the product in absolute ethanol for later use;

[0027] (2) Preparation of Fe 3 o 4 CAg

[0028] 20mg of the Fe prepared in the above step (1) 3 o 4 Add C composite microspheres, 200mg silver nitrate, 0.04mL n-butylamine and 60mL absolute ethan...

Embodiment 2

[0031] Example 2 Prepare a core-shell Fe with a magnetic core of about 150 nm, a carbon layer thickness of about 20 nm, and a silver nanoparticle shell of about 10 nm. 3 o 4 CAg microspheres and PCP solutions used to detect different concentrations

[0032] (1) Fe 3 o 4 The preparation method of C is the same as the step (1) of the above-mentioned embodiment 1; wherein, the difference is that the ferrocene addition is changed from 0.5g to 0.3g;

[0033] (2) Fe 3 o 4 The preparation method of CAg is the same as the step (2) of the above-mentioned embodiment 1; wherein, the difference is that the consumption of silver nitrate is changed from 200mg to 400mg;

[0034] (3) Using Fe 3 o 4 CAg detects the test method of the SERS spectrum of the PCP solution of different concentrations with the step (3) of above-mentioned embodiment 1; Wherein, in the present embodiment, because magnetic core is smaller, so magnetic separation speed is slower than embodiment 1 (magnetic separat...

Embodiment 3

[0035] Example 3 Prepare a core-shell Fe with a magnetic core of about 180 nm, a carbon layer thickness of about 10 nm, and a silver nanoparticle shell of about 10 nm. 3 o 4CAg microspheres and used to detect different concentrations of DEHP solutions

[0036] (1) Fe 3 o 4 The preparation method of C is the same as the step (1) of the above-mentioned embodiment 1, wherein, the difference is that the amount of hydrogen peroxide is changed from 2.0mL to 1.0mL;

[0037] (2) Fe 3 o 4 The preparation method of CAg is the same as the step (2) of the above-mentioned embodiment 1, wherein, the difference is that the consumption of silver nitrate is changed from 200mg to 400mg;

[0038] (3) Using Fe 3 o 4 The test method of CAg detecting the SERS spectra of DEHP solutions with different concentrations is the same as the step (3) of the above-mentioned embodiment 1, wherein the difference is that the detected object is changed from PCP to DEHP.

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Abstract

The invention belongs to the technical field of functional materials, and specifically relates to magnetic composite microspheres with a Raman-enhanced characteristic as well as a preparation method and application thereof. The magnetic composite microspheres take ferroferric oxide / carbon composite microspheres as cores and silver nanoparticles as shells. The preparation method of the magnetic composite microsphere comprises the following steps: firstly, preparing the magnetic ferroferric oxide / carbon composite microspheres; then, reducing silver nitrate liquor by using a reducer to prepare the ferroferric oxide / carbon / silver nanoparticle composite microsphere with uniform and compact silver nanoparticles on the surfaces through an in-situ chemical reduction method. The magnetic composite microspheres provided by the invention have the characteristics of high magnetic responsiveness, high stability, high Raman-enhanced characteristic and high recovery rate. The preparation method is simple in operation and controllable in process, and the prepared magnetic composite microspheres can be used for Raman analysis and detection of trace persistent organic pollutants in food safety and environment.

Description

technical field [0001] The invention belongs to the technical field of energy materials and relates to functional materials, in particular to a magnetic composite microsphere with Raman enhancement characteristics, a preparation method and an application thereof. Background technique [0002] The prior art discloses that Raman spectroscopy is a kind of vibrational spectroscopy, which is applied to detection and analysis, and has the following advantages: (1) It can provide information on chemical structures and functional groups at the molecular level and be used to identify specific biomolecules; (2) The spectral peak width is narrow and there is no overlap between signals, which is suitable for multiple analysis; (3) It is not interfered by water, oxygen, etc., and can detect aqueous samples; (4) It does not destroy the structure of the sample, and can provide non-destructive testing, especially suitable for biological samples detection. Therefore, Raman spectroscopy has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02G01N21/65H01F1/11H01F1/36
Inventor 汪长春安乔
Owner FUDAN UNIV
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