Preparation method for Raman active substrate with adsorbing effect on malachite green

An active substrate, malachite green technology, applied in the direction of Raman scattering, metal processing equipment, instruments, etc., can solve problems such as the sensitivity of Raman spectroscopy, and achieve a significant surface enhancement effect, enhanced selectivity, and strong selectivity Effect

Active Publication Date: 2018-12-07
CHINA AGRI UNIV
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  • Application Information

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Problems solved by technology

However, most surface-enhanced Raman substrates are not selective, which has a certain impact on the sensitivity of Raman spectroscopy

Method used

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  • Preparation method for Raman active substrate with adsorbing effect on malachite green
  • Preparation method for Raman active substrate with adsorbing effect on malachite green
  • Preparation method for Raman active substrate with adsorbing effect on malachite green

Examples

Experimental program
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Effect test

Embodiment 1

[0046] This embodiment provides a surface-enhanced Raman spectroscopy active substrate, such as figure 1 and image 3 Shown, its preparation method comprises the following steps,

[0047] Step 1. Add formaldehyde with a mass fraction of 37% and ammonia water with a mass fraction of 25% to 100ml of AgNO3 solution in sequence, mix with ultrasound and react at 30°C for 2 minutes, collect the precipitate after centrifugation, and put the precipitate into a 30ml In absolute ethanol, Ag nanoparticles with a diameter of 65 nm were obtained.

[0048] Step 2, wrapping a layer of uniform SiO on the surface of the above-mentioned Ag nanoparticles 2 film, to obtain Ag@SiO with consistent morphology 2 nanoparticles, and then modify their surface with acrylic.

[0049] The specific method is: wrap a uniform silicon dioxide film on the surface of the Ag nanoparticles, the specific method is: add 20 mL of ammonia (mass fraction: 6%) and 5 mL of TEOS in the above-mentioned 30 ml of silver...

experiment example

[0055] Ag@SiO obtained in Example 1 2 Ag@SiO obtained from @MIPs and Comparative Example 1 2 Adsorption control experiments for @NIPs.

[0056] The specific method is: weigh 10mg Ag@SiO 2 @MIPs and Ag@SiO 2 @NIPs particles, then put them in a 100ml beaker, then add malachite green standard solutions of different concentrations to it, shake fully, separate after 5 hours, measure the absorbance of the solution after separation by ultraviolet spectrophotometry, and draw the corresponding The concentration of malachite green, and then according to the malachite green concentration of the standard solution before separation, according to the difference between the two, calculate the adsorption amount of two kinds of corresponding nanoparticles to the malachite green molecule, and each group of experiments above is carried out three times respectively. It can be seen from the test results that Ag@SiO 2 The adsorption capacity of @MIPs nanoparticles to malachite green can reach m...

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Abstract

The invention provides a preparation method for a Raman active substrate with an adsorbing effect on malachite green. The preparation method for the Raman active substrate preferably comprises the following steps: coating the surface of a metal particle with a layer of an inert semiconductor film, modifying the surface with acrylic acid so as to obtain a metal nanoparticle, and allowing the metalnanoparticle to undergo a reaction with the malachite green and a vinyl monomer in the presence of a crosslinking agent and an initiator so as to obtain a surface-enhanced Raman spectroscopy active substrate with the adsorbing effect on the malachite green. The surface-enhanced Raman spectroscopy active substrate provided by the invention has specific adsorbing effect on the malachite green, and simplifies a sample preparation step and improves detection sensitivity in actual detection.

Description

technical field [0001] The invention relates to the technical field of detection materials, more specifically, to a preparation method of a Raman active substrate having an adsorption effect on malachite green, and to the Raman active substrate obtained by the preparation method and its application. Background technique [0002] In recent years, the quality and safety of aquatic products caused by excessive malachite green residues have frequently erupted. On the one hand, it has caused great harm to the health of consumers, and on the other hand, it has seriously affected the competitiveness of my country's aquatic products in the international market. . At present, there are many detection methods for malachite green in aquatic products, mainly including high performance liquid chromatography (HPLC), chromatography tandem mass spectrometry (LC-MS / MS), electrochemical method, competitive enzyme-linked immunosorbent assay (ELISA) , surface enhanced Raman spectroscopy (SERS) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/56C08F222/14C08J9/28G01N21/65B22F1/02
CPCG01N21/658C08F220/56C08F222/14C08F292/00C08J9/28C08J2201/0424C08J2351/10B22F1/102B22F1/16C08F222/102
Inventor 李道亮周新辉李震王聪王坦
Owner CHINA AGRI UNIV
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