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Method for preparing size-controlled gold nanostars with surface Raman enhanced activity

A surface Raman-enhanced, gold nanotechnology, applied in the field of material chemistry, can solve the problems of lack of high sensitivity and achieve the effect of uniform shape and high yield

Active Publication Date: 2012-12-26
JIANGNAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The signal of traditional Raman scattering spectroscopy is weak, and it often lacks high sensitivity as a means of information readout

Method used

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  • Method for preparing size-controlled gold nanostars with surface Raman enhanced activity
  • Method for preparing size-controlled gold nanostars with surface Raman enhanced activity
  • Method for preparing size-controlled gold nanostars with surface Raman enhanced activity

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Synthesis of gold species

[0028] The synthesis scheme of gold species is as follows: all glass instruments are soaked in strong acid, washed with double distilled water, and dried for later use. The water used in the experiment was 18.2 MΩ Milli-Q ultrapure water. Add 48.75mL of water to a clean Erlenmeyer flask, then add 1.25mL of chloroauric acid with a concentration of 4g / L to the water, heat and boil, then add 1.2mL of trisodium citrate solution with a mass concentration of 1%, and Stir while heating, the color of the solution turns from light yellow to red, and the reaction lasts for 6-8 minutes to allow the trisodium citrate to settle completely. on the nanoparticles. Finally, the solution was centrifuged at 6000 rpm for 40 min, the supernatant was removed, and the precipitate was resuspended in 4 mL of ethanol, which was the gold seed solution.

[0029] Synthesis of Gold Nanostars with Larger Particle Size

[0030] Synthesis scheme of gold nanostars with la...

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Abstract

The invention discloses a method for preparing size-controlled gold nanostars with surface Raman enhanced activity, belonging to the technical field of material chemistry. The method is characterized by comprising the steps of synthesizing nanomaterials with the surface Raman enhanced activity through a seed-mediated growth method, wherein the nanomaterials are gold nanostars; taking polyvinylpyrrolidone as seed liquid for stabilizer-coated gold nanoparticles; and reducing chloroauric acid adsorbed on the surface of the gold nanoparticles by using the reducing capacity of polyvinylpyrrolidone, so that the nanoparticles further grow in a crystal form direction, thereby obtaining gold nanostar particles with different forms; and meanwhile, gold nanostar materials with different surface enhanced Raman scattering (SERS) activities and different particle sizes can be obtained by changing the proportion of the reaction. According to the method, the gold nanostars with the uniform form and the relatively high yield can be prepared.

Description

technical field [0001] The invention discloses a method for preparing a size-controllable gold nanostar with surface Raman enhanced activity, which belongs to the technical field of material chemistry. Background technique [0002] As a kind of inelastic scattering spectrum, Raman spectroscopy analyzes the vibration and rotation of molecules through the scattering spectrum different from the incident light frequency, and can provide information about various normal vibration frequencies and vibrational energy levels inside the molecule. The signal of traditional Raman scattering spectroscopy is weak, and it often lacks high sensitivity as a means of information readout. In the middle and late 1970s, the discovery and confirmation of the surface-enhanced Raman scattering (SERS) effect on Au, Ag, and Cu injected new vitality into the research and application of Raman spectroscopy. It has been reported that some substances with sharp edges and pointed structures can significan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 徐丽广孙茂忠胥传来王利兵马伟匡华赵媛
Owner JIANGNAN UNIV
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