Method for rapidly preparing gold nanorod

A technology for preparing gold nanorods, which is applied in the field of nanomaterials, can solve the problems of long growth cycle, reduce reduction speed, and limit the application value of gold nanorods, and achieve the effects of less spherical particles, high yield, and shortened synthesis time

Active Publication Date: 2014-12-17
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the traditional method has always been based on CTAB synthesis. Although this method can obtain gold nanorods, the growth cycle is relatively long, generally requiring more than 12 hours of growth process. This is because the high concentration of CTAB provides A large number of bromide ions (Br-), these excess Br - It will complex with gold ions to form a complex, which greatly reduces the reduction rate of Au
From the perspective of use, too long growth cycle will inevitably limit the application value of gold nanorods.

Method used

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  • Method for rapidly preparing gold nanorod
  • Method for rapidly preparing gold nanorod
  • Method for rapidly preparing gold nanorod

Examples

Experimental program
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Embodiment 1

[0038] In this embodiment, the quaternary ammonium chloride is preferably cetyltrimethylammonium chloride. The soluble silver ion solution is preferably a silver nitrate solution. The acid solution is preferably concentrated hydrochloric acid with a mass fraction of 37%. The bromide ion solution is preferably a potassium bromide solution.

[0039] A. Preparation of growth solution: Weigh 6.145g of cationic surfactant CTAC and 1.234g of sodium oleate and dissolve them in 250mL of ultrapure water, heat and stir at 30°C until completely dissolved. This process lasts for about 2 hours. Vigorous stirring is not suitable during this process, and the degree of stirring is subject to the fact that the solution does not foam; then add 18mL, 4mM silver nitrate solution, and continue stirring for 15 minutes to reach equilibrium; then add 250mL, 1mM HAuCl 4 Solution, at this time, the solution is golden yellow, continue to keep heating and stirring until the yellow color of the solution...

Embodiment 2

[0045] This embodiment provides a method for rapidly preparing gold nanorods. The method of this embodiment is basically the same as the method for preparing gold nanorods described in Embodiment 1, and will not be repeated here.

[0046] The difference is that in this embodiment, the concentration of the silver nitrate solution is set as a concentration gradient, and multiple groups of comparative experiments can be carried out through the same method of preparing gold nanorods, and the gold nanorods prepared by using different concentrations of silver nitrate solutions can finally be obtained Gold nanorods with different aspect ratios.

[0047] figure 2 It is a comparison chart of ultraviolet-visible absorption spectra of gold nanorods with different aspect ratios prepared in this example. From figure 2 It can be seen that the transverse plasmon resonance absorption peaks of gold nanorods with different aspect ratios are all located at a wavelength of about 520nm, and th...

Embodiment 3

[0051] This embodiment provides a method for rapidly preparing gold nanorods. The method of this embodiment is basically the same as the method for preparing gold nanorods described in Embodiment 1, and will not be repeated here.

[0052] The difference is that in this embodiment, the CTAC of the same molar concentration in Embodiment 1 is replaced with the chlorine-containing cationic surfactant dodecyltrimethylammonium chloride (DTAC) or tetradecyl trimethylammonium chloride (DTAC) of different chain lengths respectively. Methylammonium chloride (TTAC) or octadecyltrimethylammonium chloride (OTAC), multiple groups of comparative experiments can be carried out by the same preparation method of gold nanorods, and the gold prepared by different quaternary ammonium chloride solutions Nanorods can finally obtain gold nanorods with different shapes and sizes.

[0053] Figure 5 It is a comparison chart of ultraviolet-visible absorption spectra of gold nanorods prepared by DTAC, T...

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Abstract

The invention discloses a method for rapidly preparing a gold nanorod, which belongs to the technical field of a nano material, and solves the problem that the existing gold nanorod seed induction growth method is long in consumed time. The method is characterized in that cationic surface active agent chloride quaternary ammonium salt is used as a protective agent, gold seeds which are obtained by reducing sodium borohydride through the reducing agent sodium oleate, ascorbic acid are added into a chloroauric acid solution under the assistant effect of ions and silver ions to obtain gold nanorods. According to the method, the synthesis of the gold nanorods can be completed in 15 minutes, so that not only can the synthesis time of the gold nanorods be greatly shortened and a material base be provided for the real application of the gold nanorods, but also the yield of the gold nanorods is high, and fewer spherical particles exist.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a method for rapidly preparing gold nanorods. Background technique [0002] As a precious metal material, gold has very stable chemical properties. Gold nanorods not only inherit the properties of bulk materials, but also have many other properties due to their unique anisotropic structure. Generally speaking, gold nanorods have two surface plasmon resonance absorption peaks (Surface Plasmon Resonance, SPR), which are a transverse plasmon resonance absorption peak and a longitudinal plasmon resonance absorption peak, and the transverse plasmon resonance absorption peak is generally located at a wavelength of 520nm. , and the position of the longitudinal plasmon resonance absorption peak can be extended from the visible region to the near-infrared region according to the aspect ratio of gold nanorods, which means that the optical properties of gold nanorods are closel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 张桥徐勇陈磊赵阳靡逸凡孙宝全夏周慧叶兴晨李述汤
Owner SUZHOU UNIV
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