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Gold nanorod and preparation method thereof

A technology of gold nanorods and formulas, applied in nanotechnology, nanotechnology, metal processing equipment, etc., can solve problems such as difficult control, not a lot, gold loss, etc., and achieve the effect of improving repeatability and reliability

Active Publication Date: 2020-09-15
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Since the growth process of gold nanorods involves the breaking of gold species growth symmetry, it is difficult to control the way to obtain high-concentration gold rods by directly increasing the concentration of gold species and precursors, and the concentration of gold nanorods synthesized by this method is not very high. High, calculated as gold atoms is 0.5mM, rod concentration is about 0.5nM; So far, there are not many methods to synthesize high-quality, high-concentration gold nanorods
Moreover, in the method for preparing gold nanorods disclosed in the prior art, the reduction rate of gold is usually very low, only less than 12%, which causes a large amount of gold loss, which is not conducive to the mass preparation of gold nanorods

Method used

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  • Gold nanorod and preparation method thereof
  • Gold nanorod and preparation method thereof
  • Gold nanorod and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0093] A kind of golden seed liquid, preparation method is as follows:

[0094] Place a round bottom flask containing 7.5 mL of 0.1 M CTAB aqueous solution in a constant temperature water bath at 30 °C, and add 250 μL of 10 mM HAuCl 4 Aqueous solution, add deionized water to make up to a total volume of 9.4mL; quickly add 0.6mL NaBH taken out of the ice-water bath to the above reaction system under stirring conditions 4 Aqueous solution (0.01M). The mixed solution was stirred for 3 minutes and then left to stand for 2 hours to obtain a gold seed solution with an average particle diameter of gold nanoparticles of 3.5 nm, and the concentration of gold nanoparticles in the gold seed solution was 0.2 μM.

Embodiment 1

[0096] A preparation method of gold nanorods, comprising the steps of:

[0097] (1) Add 0.2mL 25mM HAuCl successively to 10mL 0.1M CTAB aqueous solution 4 Aqueous solution, 70μL 100mMAgNO 3 Aqueous solution and 0.5mL 0.1M hydroquinone aqueous solution were uniformly mixed to obtain growth solution I. Put the growth solution I in a constant temperature water bath at 30°C, add 0.8mL of the gold seed solution obtained in Preparation Example 1, and let it stand for 12 hours to obtain a high-concentration primary gold nanorod reaction solution;

[0098] (2) Add 1.406mL 71.14mM HAuCl to 10mL 0.1M CTAB aqueous solution 4 Aqueous solution, 5 μL 100 mM AgNO 3The aqueous solution and 1.1 mL of 0.1 M ascorbic acid aqueous solution were uniformly mixed to obtain the growth solution II-1. Adding the growth solution II-1 to the primary gold nanorod reaction solution obtained in step (1), placing it in a constant temperature water bath at 30°C for a period of reaction for 1 hour, to obta...

Embodiment 2

[0108] A method for preparing gold nanorods, which differs from Example 1 only in that the amount of hydroquinone aqueous solution (0.1M) added in step (1) is 0.125 mL.

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Abstract

The invention provides a gold nanorod and a preparation method thereof. The preparation method comprises the following steps that (1), a growth-promoting media I containing chloroauric acid, reducingagents, soluble silver salts and surface active agents is mixed with a gold seed solution to obtain a mixture, and the mixture is reacted to obtain primary gold nanorod reaction liquid; and (2), a growth-promoting media II containing chloroauric acid, reducing agents and surface active agents is mixed and reacted with the primary gold nanorod reaction liquid obtained in the step (1) to obtain thegold nanorod. The preparation method is designed, regulated and controlled through a multi-step technology, gold seeds are separated from the growing asymmetric formation process and particle growth process from gold particles to the gold nanorod, the synthetic repeatability and reliability of the gold nanorod are obviously improved, the high-concentration and controllable-size gold nanorod is obtained, the use ratio of raw material gold atoms reaches 80% or above, the preparation cost of the gold nanorod is greatly saved, and the controllable scale production of the gold nanorod can be realized.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a gold nanorod and a preparation method thereof. Background technique [0002] In recent years, gold nanorods have become one of the most widely studied nanomaterials because of their unique shape-dependent anisotropic optical properties. The local electromagnetic field enhancement phenomenon generated by the interaction of external electromagnetic radiation and gold nanorods on the surface of gold nanorods makes them exhibit particularly attractive properties, such as surface plasmon resonance absorption, surface-enhanced Raman scattering, surface-enhanced Fluorescence, light-to-heat conversion, and luminescent properties. These advantages quickly make gold nanorods a promising bionanomaterial in the fields of optical sensing, bioimaging, biodetection, disease diagnosis, and cancer therapy. Because of this, the regulation of gold nanorod size, aspect ratio, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
CPCB22F9/24B82Y30/00B82Y40/00B22F1/07B22F1/054
Inventor 纪英露吴晓春
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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