Rapid preparation method of gold nano rod with small aspect ratio

A gold nanorod and aspect ratio technology, which is applied in the field of preparation of gold nanorods with small aspect ratio, can solve the problems of long preparation time, difficult control of the aspect ratio of gold nanorods, etc., and achieves simple preparation process, easy mass production, and high yield high effect

Inactive Publication Date: 2011-05-11
XI AN JIAOTONG UNIV
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Problems solved by technology

The pure seed-mediated growth method is difficult to control the aspect of ...

Method used

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Embodiment Construction

[0019] The preparation method of small aspect ratio gold nanorods, the steps are as follows:

[0020] Preparation of nano-gold seed solution: 0.20-0.30mL of 0.01mol / L HAuCl 4 4H 2 O solution and 7.9-8.0mL of 0.10mol / L CTAB solution were mixed evenly in a wide-mouth beaker, and then 0.5-0.7mL of 0.005-0.015mol / L NaBH treated with ice-water mixture was added 4 The solution was mixed and shaken for 1-3min, then irradiated with 254nm ultraviolet light with a power of 30W for 1.5-2.5h, and kept at a constant temperature with a 20-30°C water bath. During this stage, UV light promotes gold (Au 3+ ) reduction of ions, thereby accelerating the growth of seeds and shortening the time of seed preparation. After it fully reacts, the nano-gold seed solution is obtained.

[0021] Preparation of gold nanorods: 0.10-0.30mL of 0.01mol / L HAuCl 4 4H 2 O solution, 4.0-5.0mL of 0.10mol / L CTAB solution, 0.03-0.07mL of 0.01mol / L NaBH 4 solution, 0.03-0.04mL of 0.01mol / L ascorbic acid solution...

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Abstract

The invention discloses a rapid preparation method of a gold nano rod with a small aspect ratio. In the preparation method, ultraviolet illumination is introduced in the course of preparing the gold nano rod through a seed mediated grown method, so as to control the grown speed and the aspect ratio of the gold nano rod, wherein the ultraviolet illumination is introduced in the stage of preparing seeds by using a seed mediated grown method and in the growth stage of gold nano rod, the ultraviolet illumination can promote the reduction of Au3<+> ions in the seed preparation stage so as to accelerate the growth of the seeds and shorten the preparation time of the seeds; and in the gold nano rod growing stage, the ultraviolet illumination can strip the Au3<+> ions from the gold nano rod so that the length of the gold nano rod is reduced, and the resonance absorption peak of surface plasma performs blue shift. In the invention, the preparation time of the seeds can be shortened through the ultraviolet illumination on the basis of preparing the gold nano rod by using the seed mediated grown method, and the length of the gold nano rod is controlled. The gold nano rod with the small aspect ratio prepared by the invention can be widely applied in the fields such as photobiology sense, photothermal therapy, medicinal fluorescence imaging, solar cells and the like.

Description

technical field [0001] The invention relates to a method for preparing gold nanorods with a small aspect ratio, in particular to a method for preparing gold nanorods by introducing ultraviolet light into a seed-mediated growth method. Background technique [0002] Due to its special optical properties, that is, Surface Plasmon Resonance (SPR) properties, and its good biocompatibility, gold nanoparticles have shown great application prospects in the fields of bio-optical sensing, medical diagnosis, and clinical treatment. . Gold nanorods with a small aspect ratio have two geometric parameters, the long axis and the short axis, and there are two SPR absorption peaks in the absorption spectrum, and both absorption peaks are located in the visible light region. This feature makes the small aspect ratio gold nanorods It is possible to apply the rod as an optical probe to the fields of biosensing and medical diagnosis. [0003] At present, the methods for preparing gold nanorods...

Claims

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Application Information

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IPC IPC(8): C30B29/02C30B29/62C30B7/00B22F9/24
Inventor 朱键邓兴春李剑君赵军武
Owner XI AN JIAOTONG UNIV
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