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Preparation method for porous hollow gold-silver nano-alloy particles

A technology of alloy particles and silver nanometers, applied in nanotechnology, nanotechnology, metal processing equipment, etc., can solve the problems of poor technical stability, particle LSPR cannot fully absorb SERS signal and poor reproducibility, and achieve simple preparation method and excellent SERS Enhancement effect, the effect of good SERS enhancement effect

Active Publication Date: 2016-06-29
NANTONG NTEC MONOFILAMENT TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned technical problems, the present invention provides a porous hollow gold-silver nano-alloy particle and its preparation method to solve the problem of poor stability of the existing preparation technology, particle LSPR cannot achieve total absorption in the visible light region and poor reproducibility of SERS signal. question

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  • Preparation method for porous hollow gold-silver nano-alloy particles
  • Preparation method for porous hollow gold-silver nano-alloy particles
  • Preparation method for porous hollow gold-silver nano-alloy particles

Examples

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Embodiment 1-4

[0031] Preparation of silver nanoparticles: Add 200mL triple distilled water to a three-neck flask and heat to 70°C, then add 36mg of silver nitrate, and continue heating until the solution is in a slightly boiling state, then quickly add 4mL of sodium citrate aqueous solution with a concentration of 30mg / mL, at 95°C The reaction was carried out at low temperature for 8 minutes, and then the temperature was maintained at 85-90° C. for 60 minutes to prepare monodisperse silver nanoparticles with a particle size of about 30-40 nm. Adjust the reaction temperature to 60°C, 70°C, 80°C, and 90°C, and add 20 mL every 30 minutes to a concentration of 1.0×10 -4 mol / L chloroauric acid aqueous solution to 160mL. The SPR and Raman enhancement of the obtained alloy nanoparticles were tested respectively.

Embodiment 5

[0033] Add 200mL of triple distilled water into the three-necked flask and heat it to 70°C, then add 36mg of silver nitrate, and continue to heat until the solution is in a slightly boiling state, then quickly add 4mL of sodium citrate aqueous solution with a concentration of 30mg / mL, react at 95°C for 8 minutes, Then maintain the temperature at 85-90° C. for 60 minutes to prepare monodisperse silver nanoparticles with a particle size of about 30-40 nm. Adjust the reaction temperature to 70°C, add 20 mL every 30 minutes with a concentration of 1.0×10 -4 mol / L chloroauric acid aqueous solution to 240mL. Samples were taken at every 20mL injection interval and tested for SPR and Raman enhancement of the product under different volume addition conditions.

Embodiment 6

[0035] Add 200mL of triple distilled water into the three-necked flask and heat it to 70°C, then add 36mg of silver nitrate, and continue to heat until the solution is in a slightly boiling state, then quickly add 4mL of sodium citrate aqueous solution with a concentration of 30mg / mL, react at 95°C for 8 minutes, Then maintain the temperature at 85-90° C. for 60 minutes to prepare monodisperse silver nanoparticles with a particle size of about 30-40 nm. Adjust the reaction temperature to 70°C, and continuously add the concentration of 1.0×10 -4 mol / L chloroauric acid aqueous solution to 160mL. Samples were taken and tested for SPR and Raman enhancement of the product at different sample volumes.

[0036] The hollow gold-silver nano-alloy particles prepared in Examples 1-6 were used as the substrate, and the excitation wavelength was 785nm. Under the same detection conditions, thiophenol was used as the probe molecule to test its SERS enhancement effect.

[0037] For the conv...

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Abstract

Provided is a preparation method for porous hollow gold-silver nano-alloy particles. The method includes the following steps that 200 ml of tri-distilled water is added into a reaction vessel and heated to 60-70 DEG C, 30-40 mg of silver nitrate is added, heating is continued until the temperature reaches 90-95 DEG C, afterward, 4 mL of a sodium citrate aqueous solution with the concentration being 10-30 mg / mL is added, a reaction is performed for 5-10 minutes, and the reaction is performed for 30-60 minutes by keeping the temperature at 85-90 DEG C; the reaction temperature is adjusted to 60-90 DEG C, 20-240 mL of a chloroauric acid aqueous solution with the concentration being 1.0*10<-4> mol / L is added dropwise at the speed of 20-30 drops / minute, and the drop addition quantity is determined according to different requirements; and prepared porous hollow gold-silver nano-alloy particles are subjected to centrifugal separation and dispersed in tri-distilled water again, and the porous hollow gold-silver nano-alloy particles can be obtained. By means of the method, tuning of the localized surface plasmon resonance (LSPR) absorption peak of the porous hollow gold-silver nano-alloy particles in a full visible light region can be realized.

Description

technical field [0001] The invention relates to a preparation method of nano alloy particles, in particular to a preparation method of porous hollow gold-silver nano alloy particles. Background technique [0002] In recent years, metal nanoparticles have attracted much attention in the fields of catalysis, electronics, and biomedicine because of their unique optical and photoelectric properties, good biocompatibility, and physical and chemical properties. When the metal particles at the nanometer scale are subjected to the external electromagnetic field, the collective oscillation of valence electrons relative to the positive ion background will occur on the surface. If the frequency of the incident light is exactly equal to the oscillation frequency, a localized surface area will be generated on the metal nanoparticles. Plasmon resonance (LSPR). LSPR will lead to a great enhancement of the electric field near the metal surface, thereby endowing the metal with unique optica...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00G01N21/65B82Y30/00B82Y40/00
CPCG01N21/658B82Y30/00B82Y40/00B22F9/24B22F1/0549B22F1/054
Inventor 顾学芳田澍江国庆姜国民李弦吴思捷
Owner NANTONG NTEC MONOFILAMENT TECH CO LTD
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