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Preparation method of gold-silver composite nanoring

A technology for compounding nanorings and silver nanoparticles, which is applied in the field of preparation of nanorings, can solve the problems of inability to accurately distinguish the molecular signal to be measured, pollution caused by the environment, interference of Raman signals, etc., so as to enhance the Raman scattering effect and prepare Simple method, short time-consuming effect

Inactive Publication Date: 2015-05-06
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this preparation method obtains nanorings, it is not only easy to pollute the environment because it is synthesized in an organic solvent and uses a surfactant, but it is also difficult to effectively use the nanorings because of the surfactants adsorbed on the surface of the nanorings. As a surface-enhanced Raman scattering (SERS) substrate, because the adsorbed surfactant will directly interfere with the Raman signal of the detection molecule, resulting in the inability to accurately distinguish the signal of the molecule to be measured

Method used

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  • Preparation method of gold-silver composite nanoring
  • Preparation method of gold-silver composite nanoring
  • Preparation method of gold-silver composite nanoring

Examples

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Embodiment 1

[0028] The concrete steps of preparation are:

[0029] Step 1, first place the silver target in stirred deionized (or distilled) water. Then use a laser with a wavelength of 1064nm, a power of 30mJ / pulse, a frequency of 15Hz, and a pulse width of 5ns to irradiate the silver target for 30min; wherein, the laser emitting a laser with a wavelength of 1064nm is a Nd:YAG solid-state laser with a spot diameter of 1mm. get approximate figure 1 Colloidal solution of silver nanoparticles is shown.

[0030] Step 2, first use a laser with a wavelength of 532nm, a power of 34mJ / pulse, a frequency of 15Hz, and a pulse width of 5ns to irradiate the stirred silver nanoparticle colloidal solution for 4min; wherein, the spot diameter of the laser is 1mm, which is approximately figure 2 A colloidal solution of monodisperse silver nanoparticles is shown. According to the ratio of 0.8:1.2, the silver nanoparticle colloid solution of monodisperse is added in the chloroauric acid solution of 0....

Embodiment 2

[0032] The concrete steps of preparation are:

[0033] Step 1, first place the silver target in stirred deionized (or distilled) water. Then use a laser with a wavelength of 1064nm, a power of 35mJ / pulse, a frequency of 13Hz, and a pulse width of 8ns to irradiate the silver target for 25 minutes; the laser emitting a laser with a wavelength of 1064nm is a Nd:YAG solid-state laser with a spot diameter of 1.3mm , getting approximately figure 1 Colloidal solution of silver nanoparticles is shown.

[0034] Step 2, first use a laser with a wavelength of 532nm, a power of 35mJ / pulse, a frequency of 13Hz, and a pulse width of 8ns to irradiate the stirred silver nanoparticle colloidal solution for 3.5min; wherein, the spot diameter of the laser is 1.3mm, which is approximately figure 2 A colloidal solution of monodisperse silver nanoparticles is shown. Then according to the ratio of 0.9:1.1, the monodispersed silver nanoparticle colloid solution is added in the chloroauric acid so...

Embodiment 3

[0036] The concrete steps of preparation are:

[0037] Step 1, first place the silver target in stirred deionized (or distilled) water. Then use a laser with a wavelength of 1064nm, a power of 40mJ / pulse, a frequency of 10Hz, and a pulse width of 10ns to irradiate the silver target for 20 minutes; the laser emitting a laser with a wavelength of 1064nm is a Nd:YAG solid-state laser with a spot diameter of 1.5mm , get as figure 1 Colloidal solution of silver nanoparticles is shown.

[0038] Step 2, first use a laser with a wavelength of 532nm, a power of 36mJ / pulse, a frequency of 10Hz, and a pulse width of 10ns to irradiate the stirred silver nanoparticle colloidal solution for 3min; wherein, the spot diameter of the laser is 1.5mm, and the following is obtained: figure 2 A colloidal solution of monodisperse silver nanoparticles is shown. Then according to the ratio of 1:1, the monodispersed silver nanoparticle colloid solution is added in the chloroauric acid solution of 0...

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Abstract

The invention discloses a preparation method of a gold-silver composite nanoring. The preparation method comprises the following steps: placing a silver target material in water while stirring, and irradiating the silver target material for 10-30 minutes by using laser with the wavelength of 1064nm, the power of 30-50mJ / pulse, the frequency of 5-15Hz and the pulse width of 5-15ns to obtain a silver nanoparticle colloid solution; then, irradiating the silver nanoparticle colloid solution for 2-4 minutes while stirring by using laser with the wavelength of 532nm, the power of 34-38mJ / pulse, the power of 5-15Hz and the pulse width of 5-15ns to obtain a monodisperse silver nanoparticle colloid solution; then, adding the monodisperse silver nanoparticle colloid solution to a 0.13-0.17mmol / L chloroauric acid according to a volume rate being (0.8-1.2): (0.8-1.2), and stirring for at least 30 minutes to prepare the gold-silver composite nanoring in which a silver nanoring is modified with gold nanoparticles, wherein the ring diameter of the silver nanoring is 10-25nm, the thickness of the silver nanoring is 3-6nm and the particle diameter of the gold nanoparticles is 3-5nm. The gold-silver composite nanoring prepared by the preparation method disclosed by the invention is expected to be applied to a Raman detection technology based on a near-infrared excitation SERS (Surface Enhanced Raman Scattering) effect.

Description

technical field [0001] The invention relates to a preparation method of a nano ring, in particular to a preparation method of a gold-silver composite nano ring. Background technique [0002] In recent years, the localized surface plasmon resonance based on noble metal nanorings has a uniform electromagnetic field enhancement effect in the near-infrared range and the ring, and has a strong electronic coupling from the interaction of plasmons inside and outside the ring. , the noble metal nanohollow structure, especially the noble metal nanoring structure has received extensive attention, such as entitled "Mechanistic studies on the galvanic replacement reaction between multiply twinned particles of Ag and HAuCl4in an organic medium", Journal of the American Chemical Society, 2007, 129(6):1733-1742 ("Study on the Mechanism of the Galvanic Reaction of Polyhedral Silver Particles and Chlorauric Acid in Organic Solvents", "American Journal of Chemistry", Volume 129, Issue 6, 2007...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
Inventor 唐霞刘广强蔡伟平
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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