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A kind of preparation method of gold nanorod

A gold nanorod, soluble technology, applied in the field of nanomaterials, can solve the problems of complex operation, low yield, diameter-to-width ratio, yield influence, etc., and achieve the effect of simple synthesis conditions

Inactive Publication Date: 2016-07-06
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The template method is to electrochemically deposit gold into the pores of the porous alumina or polycarbonate template, then dissolve the template, and finally add PVP to protect and disperse the gold nanorods to obtain a stable gold nanorod solution, but The yield of this method is too low; the electrochemical method uses the gold sheet as a sacrificial anode and the platinum sheet as a two-electrode system of the cathode; the photochemical method uses CTAB and tetrakis (dodecyl) ammonium bromide (TC) in the presence of anions. 12 AB) Dual surfactants act as micelles to reduce HAuCl by UV light irradiation 4 ·3H 2 O; The seed crystal growth method is the most widely used method in the preparation of gold nanorods. The basic principle is to add a certain amount of gold nanoparticle seeds (about 3nm) to the reaction solution, Under the action of surfactant molecules such as ammonium bromide (CTAB), the seed particles grow directionally into gold nanorods with a certain length-to-diameter ratio, but the size of the gold nanoparticle crystal seed, surface electrical properties, and the molar ratio of the crystal seed to Au salt, etc. Both affect the aspect ratio and yield of gold nanorods, and the operation is complicated

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  • A kind of preparation method of gold nanorod
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  • A kind of preparation method of gold nanorod

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[0025] The invention provides a preparation method of gold nanorods, comprising: A) mixing quaternary ammonium bromide, anionic surfactant containing double bonds, soluble gold source, soluble silver salt, ascorbic acid, sodium borohydride and water in Under acidic conditions, grow and age to obtain gold nanorods.

[0026] The present invention has no special limitation on the sources of all raw materials, which can be commercially available.

[0027] Wherein, the bromide quaternary ammonium salt is a quaternary ammonium bromide well known to those skilled in the art, and there is no special limitation. In the present invention, it is preferably cetyltrimethylammonium bromide (CTAB); The above-mentioned anionic surfactant containing a double bond can be an anionic surfactant well-known to those skilled in the art, and there is no special limitation. In the present invention, it is preferably sodium oleate or potassium oleate.

[0028] The soluble gold source can be any solubl...

Embodiment 1

[0044] Dissolve 140mg of CTAB and 31mg of sodium oleate in 5ml of warm water at 50°C, then cool to 30°C, add 5ml of tetrachloroauric acid (1mmol / L), after ultrasonication for 5min, the solution becomes colorless, then add 250μL of silver nitrate (4mmol / L), shake it slightly to make it evenly mixed, add 50μL hydrochloric acid (37wt%) to adjust the pH value of the solution, then add 15μL of ascorbic acid aqueous solution (100mmol / L), ultrasonic 5min to make it evenly mixed, and finally inject Ice-cold 1 μL sodium borohydride aqueous solution (10mmol / L) was aged for 6h to obtain gold nanorods.

[0045] Utilize scanning electron microscope to analyze the gold nanorod that embodiment 1 obtains, obtain its scanning electron microscope picture as Figure 1~4 shown.

[0046] Utilize ultraviolet spectrophotometer to analyze the gold nanorod that embodiment 1 obtains, obtain its extinction spectrogram, as Figure 5 shown.

Embodiment 2

[0048] Dissolve 140mg of CTAB and 31mg of sodium oleate in 5ml of warm water at 50°C, then cool to 30°C, add 5ml of tetrachloroauric acid (1mmol / L), after ultrasonication for 5min, the solution becomes colorless, then add 250μL of silver nitrate (4mmol / L), shake it slightly to make it evenly mixed, add 50μL hydrochloric acid (37wt%) to adjust the pH value of the solution, then add 15μL of ascorbic acid aqueous solution (100mmol / L), ultrasonic 5min to make it evenly mixed, and finally inject Aged 5 μL sodium borohydride aqueous solution (10 mmol / L) for 6 h to obtain gold nanorods.

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Abstract

The invention provides a method for preparing gold nanorods. The method comprises the steps that bromination quaternary ammonium salt, anionic surfactant containing double bonds, a soluble gold source, soluble silver salt, ascorbic acid, sodium borohydride and water are mixed under the acidic condition and then aged, so that the gold nanorods are obtained. Compared with the prior art, a growth reaction is adjusted through two types of surfactant, namely, the bromination quaternary ammonium salt and the anionic surfactant, so that the nanorods are compounded at a step without seeds, and the compounding conditions are simple.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a preparation method of gold nanorods. Background technique [0002] Nanomaterials are the most dynamic research objects in the field of new materials research today, and have a very important impact on future economic and social development. They are also the most active and important components of nanotechnology that are closest to applications. Compared with bulk materials, nanoscale particles have unique physical and chemical properties. Gold nanoparticles are one of the most stable nanoparticles among metal nanoparticles, and have attracted widespread attention due to their unique physical and chemical properties. [0003] At present, in addition to spherical gold nanoparticles, gold nanoparticles of various shapes have also been synthesized, among which gold nanorods are the most widely studied and have the most application potential. Gold nanorods...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 徐国宝赖建平
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI