Preparation method of thorn-shaped gold nanoparticles and thorn-shaped gold nanoparticles prepared by the method

A technology of gold nanoparticles and nanoparticles, which is applied in the preparation of thorn-shaped gold nanoparticles and the field of thorn-shaped gold nanoparticles, can solve problems such as low catalytic activity and low SERS effect, and achieve the effect of controlling uniformity and reducing errors

Active Publication Date: 2016-08-17
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
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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 thorn-shaped gold nanoparticles prepared by the method
  • Preparation method of thorn-shaped gold nanoparticles and thorn-shaped gold nanoparticles prepared by the method
  • Preparation method of thorn-shaped gold nanoparticles and thorn-shaped gold nanoparticles prepared by the 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, keeping boiling under the condition of constant stirring to obtain a particle diameter of 10 ~30nm gold nanoparticle solution (spherical gold nanoparticles can become gold species, so the above solution can be called 10~30nm gold species solution); (b) add hydroxylamine hydrochloride solution, gold nanometer solution respectively in the acid tetrachloroauric acid solution The particle solution is subjected to size-controlled growth, and centrifuged to obtain large-diameter gold nanoparticles; (c) the large-particle-diameter gold nanoparticles are added to the deionized water whose pH is adjusted with the second sodium citrate solution, and four Chlorauric acid solution for space-confined core-shell growth (space-confined core-shell growth is to synthesize nanopartic...

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 min. 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 is 7.5 nmol / L) to 50 ml of tetrachloroauric acid solution (0.1 mmol / L, pH=5.4) , to obtain spherical core gold nanoparticles with an average particle diameter of 45nm (such as figure 2 shown in b);

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

Embodiment 2

[0038] This embodiment 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, what obtain is that average particle diameter is the spherical core gold nanoparticle of 55nm, as figure 2 Shown in c in the middle; In the step (c), the addition volume of tetrachloroauric acid is 5mL, obtains the gold nanoparticle of thorn type, owing to what carry out is that the growth of space-limited core-shell, particle final size is also 75nm; Solution is prepared by The original light pink becomes blue (such as 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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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00
Inventor 江林王丹
Owner SUZHOU UNIV
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