Gold nanorod array and preparation method and application thereof

A technology of gold nanorods and arrays, which is applied in the field of gold nanorods arrays and its preparation, can solve the problems of inability to realize nanoparticle assembly, "uneven distribution of hot spots, discontinuous structure walking, etc., and achieve high-efficiency self-assembly, regular structure, Enhancement ability is high

Active Publication Date: 2015-10-28
武汉中科先进材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the scale of the existing gold nanorod assemblies is small, (such as CN103341623 can only obtain the side-by-side mode assembly of several gold nanorods), and cannot realize large-area (ie micron-level) nanoparticle assembly, when it is used On the SERS substrate, the structure spreads discontinuously on the substrate, and the overall disorder will inevitably lead to uneven distribution of "hot spots"

Method used

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  • Gold nanorod array and preparation method and application thereof
  • Gold nanorod array and preparation method and application thereof
  • Gold nanorod array and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0053] A method for preparing a gold nanorod array, comprising the following steps:

[0054] (1) The aqueous solution of gold nanorods modified by cetyltrimethylammonium bromide (CTAB) was prepared by gold seed growth method, as follows:

[0055] a. Synthesis of gold seeds: Dissolve 2.5mL of 0.0005M chloroauric acid in 2.5mL of 0.2mol / L CTAB solution, mix well, add 0.3mL of newly configured, pre-cooled 0.01M sodium borohydride solution Quickly add to the above solution, mix vigorously for 2 minutes, and place at room temperature 25°C for 2 hours to obtain gold seeds;

[0056] b. Configuration of the growth solution of gold nanorods: add 0.15mL, 0.004mol / L silver nitrate, 5mL, 0.001M chloroauric acid solution to 5mL, 0.2mol / L CTAB, and then add 70μL of 0.0788M The sodium ascorbate was fully reduced for 2 minutes, and 12 μL of the gold seeds prepared in the above step (a) was added, and after fully stirring for 20 seconds, a mixed solution was obtained, which was left standing ...

Embodiment 2

[0072] A method for preparing a gold nanorod array, comprising the following steps:

[0073] (1) The aqueous solution of gold nanorods modified by cetyltrimethylammonium bromide (CTAB) was prepared by gold seed growth method, as follows:

[0074] Add 1mL, 5mM chloroauric acid solution into a 50mL test tube or beaker, add 5mL, 0.2M CTAB aqueous solution into it, stir gently, add 4.5mL ultrapure water, 500μL, 0.1M sodium oleate solution, 250μL, 4mM silver nitrate solution, stir slightly, add 8 μL, 37% concentrated hydrochloric acid, stir slightly, add 56 μL of 0.1M ascorbic acid, stir slightly, wait until the solution becomes colorless, quickly add 15 μL, 0.01M hydroboration Sodium solution, put it in a thermostat at 35°C for 2 to 3 hours to obtain a mixed solution;

[0075] And the above mixed solution was resuspended 2-3 times by centrifugation at a speed of 12000rpm / min (i.e., centrifuged, supernatant removed, and then dispersed with 10ml of pure water) to remove excess reac...

Embodiment 3

[0087] A method for preparing a gold nanorod array, comprising the following steps:

[0088] (1) Utilize the gold seed growth method to prepare the aqueous solution of the gold nanorods modified by cetyltrimethylammonium bromide (CTAB), specifically as follows:

[0089] a. Synthesis of gold seeds: Dissolve 2.5mL of 0.0005M chloroauric acid in 2.5mL of 0.2mol / L CTAB solution, mix well, add 0.3mL of newly configured, pre-cooled 0.01M sodium borohydride solution Quickly add to the above solution, mix vigorously for 2 minutes, and place at room temperature 25°C for 2 hours to obtain gold seeds;

[0090] b. The configuration of the growth solution of gold nanorods: add 0.10mL, 0.004mol / L silver nitrate, 5mL, 0.001M chloroauric acid solution to 5mL, 0.2mol / L CTAB, and then add 70μL of 0.0788M The sodium ascorbate was fully reduced for 2 minutes, and 10 μL of the gold seeds prepared in the above step (a) was added, and after being fully stirred for 20 seconds, a mixed solution was obt...

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Abstract

The invention discloses a preparation method of a gold nanorod array. The method includes the steps that a gold nanorod aqueous solution modified by cetyl trimethyl ammonium bromide (CATB) is prepared; the final concentration of gold nanorods and the final concentration of the CATB are adjusted to be 0.2-0.6 nmol/L and 0.5-2 mmol/l respectively; sulfhydryl compounds are added and stirred, and a mixed solution can be obtained; the final concentration of the sulfhydryl compounds is 0.01-0.2 mmol/L; after being concentrated, the mixed solution is dripped to a hydrophilic planar substrate; and the gold nanorod array is obtained after natural drying. The preparation method of the gold nanorod array is easy to operate and mild in condition. The prepared gold nanorod array is regular in structure and at the macroscopic millimeter level; and evenly-distributed SERS hot spots are arranged on the surface of the gold nanorod array, and therefore the gold nanorod array can serve as an SERS enhanced substrate easily. The invention further provides the gold nanorod array and application thereof.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a gold nanorod array and its preparation method and application. Background technique [0002] The surface-enhanced Raman scattering (SERS) effect can enhance the molecular Raman signal by a million times or even higher, and is a good chemical and biological detection method. This ultra-high enhancement mainly relies on the SERS "hot spot": it is mainly a "spot" with a very strong local electric field generated by the surface plasmon resonance at the contact position of adjacent noble metal nanoparticles as the substrate in the gap. When the detection molecule is adsorbed at the "hot spot" position, its Raman signal will be greatly enhanced. However, the reproducibility of SERS detection technology is limited due to the random distribution of "hot spot" positions within the detection system. Therefore, it is very important to prepare a SERS substrate with a uniform ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00G01N21/65B82Y40/00
Inventor 喻学锋唐思莹李泳李鹏辉郭志男
Owner 武汉中科先进材料科技有限公司
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