Preparation method of polydopamine-noble metal composite nano material with Raman-enhanced effect

A technology of composite nanomaterials and polydopamine, applied in metal processing equipment, Raman scattering, nanotechnology, etc., can solve problems such as difficult to form structures and time-consuming

Inactive Publication Date: 2017-04-26
SHANGHAI NORMAL UNIVERSITY
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  • Description
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Problems solved by technology

However, this method has the disadvantage of time-consuming due to the need for multi-step deposition; at the same time, it is difficult to form a complete structure due to the repulsion between particles

Method used

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  • Preparation method of polydopamine-noble metal composite nano material with Raman-enhanced effect
  • Preparation method of polydopamine-noble metal composite nano material with Raman-enhanced effect
  • Preparation method of polydopamine-noble metal composite nano material with Raman-enhanced effect

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Embodiment 1

[0026] Using the self-polymerization property of dopamine, polydopamine nanospheres were prepared. Dissolve dopamine solid in 1 volume of buffer system or water system containing oxidizing agent, add 5 volumes of alcohol under magnetic stirring, and make a suspension of polydopamine balls after fully reacting. The polydopamine suspension is centrifuged and washed with water several times to obtain spherical polydopamine particles with a smooth surface and an average particle diameter of 575nm, such as figure 1 shown.

Embodiment 2

[0028] Preparation of litchi-shaped polydopamine-silver composite nanoparticles. Add the silver nitrate solution to the polydopamine solution, keep a certain temperature, and under the action of the external reducing agent trisodium citrate, the silver ions are reduced into silver nanoparticles, which are attached to the outer surface of the polydopamine ball to form litchi shaped polydopamine-silver composite nanoparticles, composed of figure 2 (a) It can be seen that the distribution of silver nanoparticles is relatively uniform, closely packed, and the particle size is about 40 nm. figure 2 (b) is the electron spectrum analysis (EDX) of the synthesized "lychee shape", which can be seen to contain a large amount of Ag elements.

Embodiment 3

[0030] Optimization of the Raman enhancement effect of polydopamine-silver nanoparticles. to 10 -6 The 4-mercaptopyridine of M is used as the probe molecule, combined with a portable Raman detector, the best experimental conditions are sought through the peak intensity ( image 3 ). image 3 a is the optimization of the reaction temperature. When the reaction temperature is 60 °C and other conditions are the same, the SERS performance is the best; image 3 b is the optimization of the mass ratio of silver nitrate and polydopamine. When the mass ratio of the two is 4:1 and other conditions are the same, the SERS peak intensity of 4-mercaptopyridine is the largest. Therefore, the optimal experimental conditions are that the reaction temperature is 60 ℃, and the mass ratio of silver nitrate to polydopamine is 4:1.

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Abstract

The invention provides a preparation method of a polydopamine-noble metal composite nano material with a Raman-enhanced effect. The preparation method comprises the steps: (1) performing oxidizing auto polymerization on dopamine to form spherical polydopamine particles; (2) adding a noble metal precursor solution into an aqueous solution of the polydopamine to prepare polydopamine-noble metal nanoparticles; and (3) after centrifugal washing of the nanoparticles, storing the same at room temperature. Compared with the prior art, by taking the polydopamine particles as a template, nanoparticles of core-shell structures with controllable metal nanoparticle loading amount and adjustable distance are synthesized by regulating the reaction temperature and the rate of charge, and the nanoparticles have a remarkable SERS enhancing effect. The method has the advantages of being simple and convenient to prepare, relatively strong in Raman-enhanced effect, high in repeatability and good in stability.

Description

technical field [0001] The invention relates to a preparation method of polydopamine-noble metal composite nanometer material with Raman enhancement effect. Background technique [0002] Surface Raman-enhanced spectroscopy (SERS) is a powerful molecular spectroscopic technique that enables nondestructive analysis and ultrasensitive detection. An important factor in the application of SERS technology is the SERS active substrate. The surface plasmon resonance effect is generated through the nanometerized surface or nanoparticles. This plasmon resonance can greatly enhance the electromagnetic field around it. Therefore, the research on efficient SERS active substrates has always been a hot spot in the field of SERS. Nanoparticles of core-shell composite structure are used as SERS substrates, and the electromagnetic field is significantly enhanced in the gaps between the nanoparticles of these structures. This nanoparticle-level gap is called "hot-spot", thereby generating ult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24G01N21/65B82Y40/00
CPCG01N21/65B82Y40/00B22F9/24B22F1/054
Inventor 王丰王佩兰张雷周延玲
Owner SHANGHAI NORMAL UNIVERSITY
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