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Preparation method of thorn-shaped gold nanoparticles and thrust-shaped gold nanoparticles prepared through method

A gold nanoparticle and nanoparticle technology, applied in the field of metal nanomaterials, can solve the problems of low SERS effect and low catalytic activity, and achieve the effect of reducing error and controlling uniformity

Active Publication Date: 2015-06-24
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Generally, gold nanoparticles with a diameter of less than 10 nm have high catalytic activity, but gold particles with a diameter of less than 10 nm have very low SERS effect due to the small scattering cross section.
When the size of AuNPs is larger than 30 nm, they exhibit strong electric field enhancement and thus high SERS effect, but the catalytic activity of large-sized AuNPs is relatively low

Method used

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  • Preparation method of thorn-shaped gold nanoparticles and thrust-shaped gold nanoparticles prepared through method
  • Preparation method of thorn-shaped gold nanoparticles and thrust-shaped gold nanoparticles prepared through method
  • Preparation method of thorn-shaped gold nanoparticles and thrust-shaped gold nanoparticles prepared through method

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preparation example Construction

[0024] The preparation method of thorn-shaped gold nanoparticles of the present invention comprises the following steps: (a) adding the first sodium citrate solution into the boiling first chloroauric acid solution, and keeping boiling under constant stirring to obtain a particle diameter of 10 ~30nm gold nanoparticle solution (spherical gold nanoparticles can become gold seeds, so the above solution can be called 10~30nm gold seed solution); (b) add hydroxylamine hydrochloride solution, gold nano The particle solution is subjected to size-controlled growth, and centrifuged to obtain large-diameter gold nanoparticles; (c) adding large-diameter gold nanoparticles to deionized water whose pH is adjusted with the second sodium citrate solution, and adding four Chlorauric acid solution for space-confined core-shell growth (space-confined core-shell growth means synthesizing nanoparticles with corresponding shapes in a growth space of a given size, and space-confined core-shell grow...

Embodiment 1

[0033] This embodiment provides a preparation method of spiny gold nanoparticles and obtains corresponding spiny gold nanoparticles, which specifically includes the following steps:

[0034] (a) Add 5 mL of 0.01 mol / L chloroauric acid solution to 90 mL of deionized water and stir (stirring speed is 1200 rpm) and heat to boiling, then add 5 mL of 0.09 mol / L sodium citrate solution and keep boiling for 15 minutes to prepare A 13nm gold nanoparticle solution (such as figure 2 shown in a);

[0035] (b) Add 600 μL of hydroxylamine hydrochloride solution (200 mmol / L) and 1 ml of 13 gold nanoparticle solution (particle concentration: 7.5 nmol / L) into 50 ml of tetrachloroauric acid solution (0.1 mmol / L, pH = 5.4) , to obtain spherical nuclei gold nanoparticles with an average particle size of 45nm (such as figure 2 shown in b);

[0036] (c) Add 500 μL (particle concentration: 7.5 nmol / L) of spherical core gold nanoparticles (45 nm) after centrifugal purification to an aqueous sol...

Embodiment 2

[0038] This example provides a preparation method of thorn-shaped gold nanoparticles and obtains corresponding thorn-shaped gold nanoparticles. The preparation process is basically the same as in Example 1, except that the amount of materials used is different: in step (b) , the addition of tetrachloroauric acid growth solution is 100 milliliters, and what obtain is that the average particle diameter is the spherical nuclei gold nanoparticle of 55 nm, as figure 2 As shown in c; in step (c), the volume of tetrachloroauric acid added is 5mL, and the thorn-type gold nanoparticles are obtained, and the final size of the particles is also 75nm due to the space-confined core-shell growth; the solution is prepared by The original pale pink color changes to blue (eg image 3 shown in b).

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Abstract

The invention relates to a preparation method of thorn-shaped gold nanoparticles and thrust-shaped gold nanoparticles prepared through the method. The method includes the following steps that step a, a first sodium citrate solution is added into a first boiled chloroauric acid solution, boiling is kept under the condition of constant stirring, and therefore a gold nanoparticle solution of which the particle size ranges from 10 nm to 30 nm is obtained; step b, a hydroxylamine hydrochloride solution and the gold nanoparticle solution are added into an acid gold chloride solution for performing growth control over the particle size, and large-particle-size gold nanoparticles are obtained in a centrifugal mode; step c, the large-particle-size gold nanoparticles are added into deionized water of which the pH is adjusted through a second sodium citrate solution, gold chloride is added under the condition of constant stirring for space limited-range core shell growth, and the gold nanoparticles can be obtained in a centrifugal mode. On one hand, the sodium citrate solutions are selected and used for adjusting the pH value of the solution, and on the other hand, the sodium citrate solutions have the unexpected advantages that the sodium citrate solutions are good stabilizers for the gold nanoparticles, and the particle size and the evenness of the gold nanoparticles are easily controlled.

Description

technical field [0001] The invention belongs to the field of metal nanomaterials, and in particular relates to a method for preparing thorn-shaped gold nanoparticles and thorn-shaped gold nanoparticles prepared by the method. Background technique [0002] Due to their unique surface plasmon resonance properties, noble metal nanoparticles can realize the surface-enhanced Raman scattering (SERS) function of high-sensitivity single-molecule detection, so they can be used to monitor chemical or biochemical reactions in situ for better understanding Reaction kinetics mechanism; in addition, gold nanoparticles also have a good catalytic effect, showing important industrial application prospects. At present, some catalytic reactions still have problems such as low catalytic activity or low selectivity, and unclear reaction mechanism and kinetic process. If the surface-enhanced Raman scattering function of metal nanoparticles can be effectively combined to realize the in situ monit...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00
Inventor 江林王丹
Owner SUZHOU UNIV
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